so I suppose if we follow the rabbit down the hole. Long term it explains why these engines eat up catalytic converters. Because if the intake(air/fuel)valve is constantly bleeding air into the cylinder that's going to make it run lean, and lean means extremly hot exhaust gas, excessively hot exhaust means melted converter, broken exhaust manifold bolts at the head, ect.. It all makes sense now. Thanks scannerdan, great series, subscribed!:]
So I have this issue with my h3 and been driving it for about 10,000miles with this valve sear issue(bought the h3 used with 165,000 miles) now has 175,000. Will it hurt anything if I continue to drive as is??! Thanks!
Good to see the conclusion thanks for posting. I had a chevy colorado with the same 3.5 motor that had similar issues eg slightly eradic idle, misfire codes that were only intermittent. The truck only had 88k so I sold it fearing it was the dreaded and common valve seat issue.
Two weeks ago, I fixed a 2006 Hummer H3 with this exact same problem. I noticed that there is TSB for this problem. By watching your videos, I felt very confident performing the job. Thank you ScannerDanner.
how about go TDC on # 4 bore scope in cyl. put small rubber hose through intake get it close to the valve ,squirt in WD40 watch for leakage.Something like this may have been suggested already,dont know didnt read all posts,love this channel,,always well explained
On this one, it's apparent and can be seen with the naked eye. Though I've taken heads off you couldn't see a problem with valves or the seats. Put a spark plug back in and fill combustion chamber with varsol and watch it come pouring out. As always, great videos Mr. Danner
Hey Paul. I just watched all the Hummer series over again and Cook particular interest to the maf sensor waveform. For the exercise i am going to perform the tests using my Pico on a known good vehicle that has adjustable rockers and create inlet leaks and exhaust leaks and compare them with valve sealing properly. I will recharge the battery between each test (although proberbly not neccesary) to eliminate any variable cranking speed. Hopefully the tests will give us good direction by being able to compare the same cylinder in various conditions. I will email the results to you when i have done it. Regards. James
+james ross I've always had to charge the battery between compression tests, but I've seen batteries that hold their state of charge better. Now realize, one of these batteries tested good on very professional equipment too.
+james ross With a voltmeter you can see when you've gotten to the exact same voltage. It really doesn't take long. The first compression test I did showed less compression in every cylinder. I'd never heard of batteries being run down in so little cranking but I suspected it. Ran the first cylinder again after doing the whole engine and it had equally less compression as if it was the "worst" cylinder.
did you rebuilt the head or did you buy new one gm has update head with harder valve seatsreason I was asking you mind at dealer now they want do valve job on it
Nice I had the same problem before I Found the problem valve sits there is a TSB I like all you r videos I learned a lot from you thank you scanner danner
My dads is throwing injector code so we bought all new and replaced and didn’t think to compression test because it’s injector electrical code , but did compression test so now looks like it’s going to be this, compression is 0, did this one have 0?
Do you have footage of you removing the valve head. Doing a similar project and only video I’ve seen close to what I’ve got going on. Going to be taking the head off soon and probably all the valves. Would appreciate any footage.
Great videos Paul! Many thanks for all your effort! It seems to me that the valves are also slightly bent, caused by an incorrect heat distribution along them, for using a "not so great quality" material...maybe? Just a thought. Anyways, keep doing what you`re doing man, you really are a very good technician and a great teacher too. Thumbs up!
Great video! I have this exact same issue right now. The head is almost off. Question? Did you have the "Valve seats" replaced if so how many and which cylinders or did they do a valve job only? What is the permanent fix?
@alexrojas2121 what's the SITREP on your Hummer ? I assume you have an H3 2006? I am planning on buying a H3 with a replaced engine and teansmission. It runs like new during my test drive. Just trying to develop a maintenance plan for my 2007 H3
I wish right now I lived in a different state cause I love the body style what a money pit and the motor design was a fluke 4cly with a turbo would of been better or learn Real American standard like the 6 cylinder diesel that keeps America running
Paul was the valve and seat distortion a cause or a result of the misfire. Your engine professor that was involved in the case did he have any thoughts after viewing the valve and seats ? That was an awesome series .
10.1.15. @ scanner danner, I thought all you did was drivability troubles!.......I'm so used to seeing you do almost everything emissions or drivability!......Just saying.........I don't see you as a regular mechanic! 😎👍🏽
the problem on those is the same as the problems with the 3.5 straight 5 in the colorado/canyon 05 and 06 years I believe. gm used seats that were too soft that would wear out quickly like this. gm has a revised head with harder seats and I believe this is covered under warranty up to 100k miles.
I see that all the time on those soft MAZDA heads. They get a hot spot and the alum sags in that area causing a leak. If that area cleans up last when you cut the seat that is pretty much the same thing
great vid. mine is in the dealer as we speak... mine was leaking oil up through the breather hose in back part of the engine that goes to the airbox. sounds like a minor fix right? lol
+Harout Najarian email me and I'll give you a free month coupon for my premium channel. you will get so much more out of the book as I will be teaching you page for page all the way through it. thanks again!
Hi Master Paul!! thanks for your video!! How is possible to identify if there is something wrong with the valves? I mean before buy the car, is possible to identify it over a different sound or something like that? I want to buy a Hummer H3 3.5 and would like to know before if the car has already the issue… Thanks in advance for your feedback!! BR
Also chevy Colorado and gmc canyon aswell as isuzu all share the same motor and all have same issue my 2.9L with only 89k miles is giving me all types of issues i love the truck
Was this the final conclusion to the RTI Hummer you brought into the classroom last year? Did this video get lost or did it just take that long to find the valve seat problem?
+ScannerDanner Better late than never. Thank you for posting this. I was wondering if maybe the fix was a premium channel only video... which I REALLY need to subscribe to!
To add some accuracy to the test i will connect a leak down tester to the cylinder when creating the valve leak and bring it up to the same 70% we seen on the Hummer
So there is a recall this issue. Because i want to get a H3 but I kept seeing this issue and it scared me away. My backup options is a Ford Edge but I really want a H3 but not if it is going to be problem
hi scanner you gotta check out elan musks new X car it has new type sensor for the falcon wing door system totally cool it senses through metal to correct trajectory of opening falcon wing doors so as not to hit things on side of and over car now i want to know about the falcon wing doors sensor
I’ve been having the same problem for several months now with my 2008 hummer h3. With the cold start and then the engine would idle really bad. How much would it cost to replace this valve seat With parts and labor?
So I have this issue with my h3 and been driving it for about 10,000miles with this valve seat issue(bought the h3 used with 165,000 miles) now has 175,000. Will it hurt anything if I continue to drive as is??! Thanks!
It will eventually ruin your catalytic converter. That's about it. Maybe more frequent oil changes will be needed too, due to incomplete combustion and blow-by gases accumulating in the crankcase.
This is exactly what iv been wondering Im guessing I have the same issue on my 06 h3 but I really dont want to do that extensive of engine work but if the consequences of not addressing it is minor screw it let her burn
Mine's had low compression in one cylinder for years. Probably this issue. There's an elevated misfire count, but not enough to set a code. Idles fine, runs well enough. CC still good. I'm planning a rebuild maybe this summer. Will a mild valve grind resolve it long term? IDT new heads are avail anymore. Thanks!
All those 3.5/3.7L motors had head problems. I remember when we would get those in on trade they always ended up at GM getting the head replaced under warranty lol
I wish you could have colored the valve with a black marker ..put it back in the head ..and spun it around and pulled it back out ..would have shown how the seat meshed with the valve
+Billy R haha I know. I did show this in the one live event I did on my premium channel but it was horrible and I haven't done one since. Anyway, then I just forgot about it.
just had the head replaced by a chevy dealer they said #2 wasn't seating properly charged my 2600 had my truck over a week got it back still feel a vibration in the truck when sitting at idle any thoughts on what it is? dealer told me it's an 06 not a 2017 lol
@@HummerH-mo4cs , local shop was 3300 fist time, then I had a bad oil filter (acdelco) they did nothing, so another 3300 , when it spun a thrush bearing , I bought a motor from jasper , it lasted 60 k miles $6500, when it locked up due to main bearings, they covered it under warranty, I put the forth motor in and sold the piece of shit the inline 5 motors are trash , and gm knows it , you will be ahead of you haul it to the scrap yard , they are junk , those motors have issues
That would turn me insane trying to discover the reason for this misfire. I have a question though, such valve seat damage didn't show in compression or leak down Tests?
Wow... That's awful! I've never seen anything like that! That is not normal wear... I suspect that there's a valve (non)rotation issue, and the carbon buildup on that valve makes me think it's involved, too. That's pretty much not repairable, either. That'll need new seats. Ah well, time to pass it off to the Engines department! Have 'em knock down that god-awful machinist ridge, too; give yourself some low-lift flow. :D
Too little cooling in the center of the head. Wall between intake and exhaust overheated and warped resulting in the non contact area. Design has a metal fin between intake and exhaust without a proper thermal path to the coolant.
just had the head replaced by a chevy dealer they said #2 wasn't seating properly charged my 2600 had my truck over a week got it back still feel a vibration in the truck when sitting at idle any thoughts on what it is? dealer told me it's an 06 not a 2017 lol
Johnny Perkins is it not even worth replacing? I have 64k miles on my 2008 hummer h3. I’m experiencing the same things you are. With the rough idle with the rpm bouncing when you crank the engine from a cold start and the decreased engine power when I’m accelerating the vehicle. I’ve been debating to sell my 08 h3 to carmax or trading it in for a new vehicle.
so I suppose if we follow the rabbit down the hole. Long term it explains why these engines eat up catalytic converters. Because if the intake(air/fuel)valve is constantly bleeding air into the cylinder that's going to make it run lean, and lean means extremly hot exhaust gas, excessively hot exhaust means melted converter, broken exhaust manifold bolts at the head, ect.. It all makes sense now. Thanks scannerdan, great series, subscribed!:]
diagnosed a bunch of those valve problems, good to see the tear down
So I have this issue with my h3 and been driving it for about 10,000miles with this valve sear issue(bought the h3 used with 165,000 miles) now has 175,000. Will it hurt anything if I continue to drive as is??! Thanks!
Good to see the conclusion thanks for posting. I had a chevy colorado with the same 3.5 motor that had similar issues eg slightly eradic idle, misfire codes that were only intermittent. The truck only had 88k so I sold it fearing it was the dreaded and common valve seat issue.
I had to watch the video twice, but everything you worried about showing up, showed up. Thanks for sharing.
+DE Nichols thanks for watching!
Very nice, them look like hot spots in the seats that caused the valves to deform the seats. Seen that several times.
Two weeks ago, I fixed a 2006 Hummer H3 with this exact same problem. I noticed that there is TSB for this problem. By watching your videos, I felt very confident performing the job. Thank you ScannerDanner.
+George Herrera cool, thank you!
how about go TDC on # 4 bore scope in cyl. put small rubber hose through intake get it close to the valve ,squirt in WD40 watch for leakage.Something like this may have been suggested already,dont know didnt read all posts,love this channel,,always well explained
When are H3 owners going to file a class action against GM, I and many others are having this problem and it dont look that easy to fix.
On this one, it's apparent and can be seen with the naked eye. Though I've taken heads off you couldn't see a problem with valves or the seats. Put a spark plug back in and fill combustion chamber with varsol and watch it come pouring out. As always, great videos Mr. Danner
Hey Paul.
I just watched all the Hummer series over again and Cook particular interest to the maf sensor waveform. For the exercise i am going to perform the tests using my Pico on a known good vehicle that has adjustable rockers and create inlet leaks and exhaust leaks and compare them with valve sealing properly. I will recharge the battery between each test (although proberbly not neccesary) to eliminate any variable cranking speed. Hopefully the tests will give us good direction by being able to compare the same cylinder in various conditions. I will email the results to you when i have done it.
Regards.
James
+james ross I've always had to charge the battery between compression tests, but I've seen batteries that hold their state of charge better. Now realize, one of these batteries tested good on very professional equipment too.
+james ross With a voltmeter you can see when you've gotten to the exact same voltage. It really doesn't take long. The first compression test I did showed less compression in every cylinder. I'd never heard of batteries being run down in so little cranking but I suspected it. Ran the first cylinder again after doing the whole engine and it had equally less compression as if it was the "worst" cylinder.
did you rebuilt the head or did you buy new one gm has update head with harder valve seatsreason I was asking you mind at dealer now they want do valve job on it
Nice I had the same problem before I Found the problem valve sits there is a TSB I like all you r videos I learned a lot from you thank you scanner danner
+Jesus Ramirez Thanks brother
My dads is throwing injector code so we bought all new and replaced and didn’t think to compression test because it’s injector electrical code , but did compression test so now looks like it’s going to be this, compression is 0, did this one have 0?
Do you have footage of you removing the valve head. Doing a similar project and only video I’ve seen close to what I’ve got going on. Going to be taking the head off soon and probably all the valves. Would appreciate any footage.
I do not Jason, sorry
Great videos Paul! Many thanks for all your effort! It seems to me that the valves are also slightly bent, caused by an incorrect heat distribution along them, for using a "not so great quality" material...maybe? Just a thought. Anyways, keep doing what you`re doing man, you really are a very good technician and a great teacher too. Thumbs up!
Great video! I have this exact same issue right now. The head is almost off. Question? Did you have the "Valve seats" replaced if so how many and which cylinders or did they do a valve job only? What is the permanent fix?
unfortunately Alex, I did not do the repair on this, so I cannot answer your questions definitively
@alexrojas2121 what's the SITREP on your Hummer ? I assume you have an H3 2006? I am planning on buying a H3 with a replaced engine and teansmission. It runs like new during my test drive. Just trying to develop a maintenance plan for my 2007 H3
I wish right now I lived in a different state cause I love the body style what a money pit and the motor design was a fluke 4cly with a turbo would of been better or learn Real American standard like the 6 cylinder diesel that keeps America running
fuuu, thumbs up for not giving up!
Paul was the valve and seat distortion a cause or a result of the misfire. Your engine professor that was involved in the case did he have any thoughts after viewing the valve and seats ? That was an awesome series .
+Steve Rob It was the cause of the misfire. And yes he did. He said "what a shitty design" ha
10.1.15. @ scanner danner, I thought all you did was drivability troubles!.......I'm so used to seeing you do almost everything emissions or drivability!......Just saying.........I don't see you as a regular mechanic! 😎👍🏽
The Good Shepherd and His Sheep - absolutely brilliant reference brother. 👌
the problem on those is the same as the problems with the 3.5 straight 5 in the colorado/canyon 05 and 06 years I believe. gm used seats that were too soft that would wear out quickly like this. gm has a revised head with harder seats and I believe this is covered under warranty up to 100k miles.
Wrong, the problem doesn't exist according to GM and has never been covered under any extension of their standard warranty.
Is this problem only pertain to the 2006 H3 with the 3.5L ? Or does the 3.7 have the same problem? Thanks for posting
also 3.7 are affected
I see that all the time on those soft MAZDA heads. They get a hot spot and the alum sags in that area causing a leak. If that area cleans up last when you cut the seat that is pretty much the same thing
Great find Paul brilliant work
Thanks Steve
Does this happen on the 07 , H3 hummers also ?
great vid. mine is in the dealer as we speak... mine was leaking oil up through the breather hose in back part of the engine that goes to the airbox. sounds like a minor fix right? lol
I just purchased your book spent $117 I didn't have it better be good my friend!!!
+Harout Najarian email me and I'll give you a free month coupon for my premium channel. you will get so much more out of the book as I will be teaching you page for page all the way through it.
thanks again!
👍Great series. Thanks for sharing.
Hi Man!
Thx for video. How much is milage on your H3?
was the conclusion of that GM valve problem that the stem was too weak and some of the valve found a resonance and oscillated?
That small amount of wear caused a big headache! Nice work
+Ozzstar yep, thanks!
Hi Master Paul!! thanks for your video!! How is possible to identify if there is something wrong with the valves? I mean before buy the car, is possible to identify it over a different sound or something like that? I want to buy a Hummer H3 3.5 and would like to know before if the car has already the issue…
Thanks in advance for your feedback!!
BR
Do a cranking compression sound test. I have some videos on this. Just disable fuel and crank it and listen to it
@@ScannerDanner Thank you!! 👍🏻 Keep on going! you are doing a very good job!! Happy to see your Videos 👍🏻
@@asaco4489 did you find a video where I show the test? Check in my chapter 1 playlist if you haven't yet (right here on YT)
@@ScannerDanner Yes I did it 👍🏻 Thanks!
Thanks for the Uploads!
Also chevy Colorado and gmc canyon aswell as isuzu all share the same motor and all have same issue my 2.9L with only 89k miles is giving me all types of issues i love the truck
Was this the final conclusion to the RTI Hummer you brought into the classroom last year? Did this video get lost or did it just take that long to find the valve seat problem?
+DJDevon3 video got lost :)
+ScannerDanner Better late than never. Thank you for posting this. I was wondering if maybe the fix was a premium channel only video... which I REALLY need to subscribe to!
+GRowe1978 Email me through my website and I'll give you a coupon for a free month when your ready. Mention this post. Thanks!
ScannerDanner Hey thanks Paul. I really appreciate that!
+ScannerDanner now that would be great!
thanks Paul, it`s wonderful series.
+Ahmed Shamy thanks my friend
Whats the easy way to get the intake manifold off
To add some accuracy to the test i will connect a leak down tester to the cylinder when creating the valve leak and bring it up to the same 70% we seen on the Hummer
Good to see this. Thanks Paul.
+Don Gamble no problem, thank you
Gm has a recall about the head issues on the H3 with the V6. They all crack or they have valve issues
+Travis R. I believe the motor is an I5
however the V8 Alpha H3 never had head issues.
So there is a recall this issue. Because i want to get a H3 but I kept seeing this issue and it scared me away. My backup options is a Ford Edge but I really want a H3 but not if it is going to be problem
yes i used to work for GM/Hummer. also the radiators would crack on the v6 v8 alpha. in my opinion they are a pile of garbage.
Ok thanks, guess I have more research to do to find the somewhat perfect suv
I was wondering if you pulled from a correct cylinder, to compare the valve seat...
+Joop Terwijn I did not, sorry. It would have been good to show
hi scanner you gotta check out elan musks new X car it has new type sensor for the falcon wing door system totally cool it senses through metal to correct trajectory of opening falcon wing doors so as not to hit things on side of and over car now i want to know about the falcon wing doors sensor
what was the total costs of this repairs?
I’ve been having the same problem for several months now with my 2008 hummer h3. With the cold start and then the engine would idle really bad. How much would it cost to replace this valve seat With parts and labor?
sorry, can't help you with that. I don't do the repairs. I just tell other shops what to do.
I can see it, thanks for the info.
What do you suggest
A new cylinder head or take it to a reputable machine shop (which is a dying breed, so good luck)
Great video - I'm buying a 2008 H3 WITHOUT this problem(yet)... my question is, Approx how much should this repair cost? Thanks, Russ
I dont know. I'm sorry. Wild guess, $1500-$2000
2008 3.7 liters engine not known for this issue
So I have this issue with my h3 and been driving it for about 10,000miles with this valve seat issue(bought the h3 used with 165,000 miles) now has 175,000. Will it hurt anything if I continue to drive as is??! Thanks!
It will eventually ruin your catalytic converter. That's about it. Maybe more frequent oil changes will be needed too, due to incomplete combustion and blow-by gases accumulating in the crankcase.
ScannerDanner awesome definitely appreciate the fast reply!!!
Does your motor misfire or it just burns more oil?
This is exactly what iv been wondering Im guessing I have the same issue on my 06 h3 but I really dont want to do that extensive of engine work but if the consequences of not addressing it is minor screw it let her burn
Mine's had low compression in one cylinder for years. Probably this issue. There's an elevated misfire count, but not enough to set a code. Idles fine, runs well enough. CC still good. I'm planning a rebuild maybe this summer. Will a mild valve grind resolve it long term? IDT new heads are avail anymore. Thanks!
Hi there , so i guess in this case you have to Change the head cylinder with a Rebuild one
and the problem would be gone ?
Or send the head out and have all new valves and seats put in it. Whatever method is more cost effective
is this problem on all hummers? 3.5 or 3.7
not sure
grate info thanks.
thanks Paul
+Jesus Malagon Thank you my friend
Was this vehicle using E85?
+besssam I do not think it was
All those 3.5/3.7L motors had head problems. I remember when we would get those in on trade they always ended up at GM getting the head replaced under warranty lol
So how long do the new heads last ? And was there any changes made to the head to fix problems
I wish you could have colored the valve with a black marker ..put it back in the head ..and spun it around and pulled it back out ..would have shown how the seat meshed with the valve
@ScannerDanner for president
How much $$$$ to fix this problem?
The real question is would you put all that money (maybe $1500-2000) In the top end of a high mileage engine and do nothing with the bottom end?
Paul, awesome to see physical, tangible evidence to back up the high tech diagnostic evidence ! Even a year later ! LOL !
+Billy R haha I know. I did show this in the one live event I did on my premium channel but it was horrible and I haven't done one since. Anyway, then I just forgot about it.
just had the head replaced by a chevy dealer they said #2 wasn't seating properly charged my 2600 had my truck over a week got it back still feel a vibration in the truck when sitting at idle any thoughts on what it is? dealer told me it's an 06 not a 2017 lol
Just got done rebuilding my h3 inline 5 ,bad valves,
how much was your rebuild ??
@@HummerH-mo4cs , local shop was 3300 fist time, then I had a bad oil filter (acdelco) they did nothing, so another 3300 , when it spun a thrush bearing , I bought a motor from jasper , it lasted 60 k miles $6500, when it locked up due to main bearings, they covered it under warranty, I put the forth motor in and sold the piece of shit the inline 5 motors are trash , and gm knows it , you will be ahead of you haul it to the scrap yard , they are junk , those motors have issues
@@gollywopper1 OUCH lol, thanks for the reply :( . I have had no problems at all (110k miles) 2009 3.7 Luxury edition, knock on wood lol. :)
Nice
That would turn me insane trying to discover the reason for this misfire. I have a question though, such valve seat damage didn't show in compression or leak down Tests?
+stilkus it did. Watch the series. Thanks!
+ScannerDanner just started it 3 minutes ago. Very interesting case.
+stilkus cool, you'll like it for sure
Wore plum out
So h3 is not a good car?
The seats are burnt.
Wow... That's awful! I've never seen anything like that! That is not normal wear... I suspect that there's a valve (non)rotation issue, and the carbon buildup on that valve makes me think it's involved, too. That's pretty much not repairable, either. That'll need new seats. Ah well, time to pass it off to the Engines department! Have 'em knock down that god-awful machinist ridge, too; give yourself some low-lift flow. :D
+rhkips haha yep, time to pass it off. Actually it was the engine class that removed the head and took the valves out for me. :)
Too little cooling in the center of the head. Wall between intake and exhaust overheated and warped resulting in the non contact area. Design has a metal fin between intake and exhaust without a proper thermal path to the coolant.
Part of GM's plan to keep customers from ever purchasing another vehicle from them!
lol
took not cook :-)
just had the head replaced by a chevy dealer they said #2 wasn't seating properly charged my 2600 had my truck over a week got it back still feel a vibration in the truck when sitting at idle any thoughts on what it is? dealer told me it's an 06 not a 2017 lol
Johnny Perkins is it not even worth replacing? I have 64k miles on my 2008 hummer h3. I’m experiencing the same things you are. With the rough idle with the rpm bouncing when you crank the engine from a cold start and the decreased engine power when I’m accelerating the vehicle. I’ve been debating to sell my 08 h3 to carmax or trading it in for a new vehicle.