Vortec Big Block 7.4 Injectors and Regulator: curing a hard start & 600hp worth of fuel
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- เผยแพร่เมื่อ 24 ก.ค. 2024
- My K2500 Suburban is powered by a vortec big block, aka 7.4 vortec, or L29. Probably one of the most common problems with the 7.4 vortec is a hard start condition caused by leaking fuel injectors and the fuel pressure regulator. In this video I'll replace the faulty parts with new, but instead of just using stock parts, we're increasing the capacity of the injectors by almost double. I'm using some FAST injectors and an OEM fuel pressure regulator, and HP Tuners to make the adjustments inside the computer.
FAST 36 lb/hr injectors (rated at 43 psi)
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AC Delco fuel pressure regulator
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HP Tuners MPVI2
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#bigblockchevy #suburban #454
Chapters
0:00 The MOST COMMON L29 Problem
1:58 Future Big Block Plans
2:30 The Parts I'm Using
4:59 Tear Down
9:00 Tips and Tricks
11:26 ReAssembly
14:54 Will it Start?
15:15 Tune for Larger Injectors
16:16 Installation Notes
18:02 Lazy Technicians make me ANGRY
19:49 Hot Restart Test
20:58 Datalog Results - ยานยนต์และพาหนะ
LT, I really like the fact you explain why you are changing parts (injectors) and what to expect with changes. Last, but more important (to me) is the goal for more performance that is reliable! Keep it up!
Keep up the great work! Really liking these videos on the K2500 Suburban.
Awesome stuff for the K2500 LT, I’m Used to using those exact injectors on VW/Audi Tuning for 1.8 2.0 turbo motors, easy to find as well flow matched and tested. I always liked the spray pattern and fuel pressure regulator options, push in clip style, to bump up or drop flow. Another great option were the Rochesters for this truck, I’ve played with both. Keep up the great work, with your Performance Shop, I like your full spectrum builds from Fabrication to Tuning, Few guys like that out there. 👍🏽⚙️🏁🛠🔥💰
This is a great skill to pick up. Makes a huge difference in just about any car especially one with a few years on it. Explanations much appreciated. 😎🤩
It does start a lot better! Nice work!! Lookin forward to seeing how you plan on modifying the exhaust system, it should be good!!
I’m loving this series I just bought a 97 2500 4x4 suburban and I’m going to be transplanting the drivetrain into a 98 rcsb 4x4 with a 0411 swap and the 454 rebuilt into a 496, shift kit in the 4l80 and front and rear lockers. So there’s a good bit of useful info here.
Well done, LT!! Looking forward to more of this project.
You made that look super easy... I'm sure it would take me a few more hours to do. Just found your channel so I'll go back to look for another video on it but, you didn't capture putting the distributor back in and that's the part that makes me nervous about pulling my plenum and intake manifold to fix a small coolant leak on my '99 K2500 Suburban. It has the same engine so I'm sure I can go find some more great videos. Thanks for sharing.
I grew up in the 90s and have always had an affinity for the OBS Chevy trucks. My first vehicle was a 98 K2500 with the 7.4. I loved that truck but just didn't have the money to keep it running. In 2017 I picked up another 98, this one is a K1500 5.7 that I'm almost done swapping to 6.0 with some power adders. I'm hoping for around 500 crank HP. Keep up the videos, it's awesome to see the truck evolve.
I am pulling and having my injectors cleaned and calibrated, 98 mercruiser 7.4 same fuel rail as yours.. Thanks for the pointers on removing injector clips. Very helpful.
Glad to help
Great video. I have a 1996 suburban. With the 454. 0411 mod. I will follow your build to do the same to mine.
Quickly becoming one of my favorite TH-cam channels
Top notch work LT , the details do matter.
Love it please keep working on the old 454 I'm gonna do all of this to mine. I have a 97 k3500 with kingpin 60 3 link and kings on the front time for some power mods. Thanks LT
I have to do this same thing to my 1996 c3500 dually this is definitely a helpful video. Glad i subscribed
This truck is going to be sweet! Thanks for the videos LT😎
Awesome! Exactly why I had my intake off. Ended up doing lower intake gaskets, MSD coil, New distributor, along with new rail. Then port matches upper and lower intakes. Mine had also been previously worked on poorly.
Did you feel a difference with that? I have a 99 2500 burb. Doing long tubes and dual3" exhaust plus tune right now. Appreciatre any feedback from your comment.
I get that about putting things back where they go. I just bought a ‘99 k3500 and it was said to run rough then when I bought it wouldn’t start. But I’m about to check timing because it looks way out. Also all the coolant sensors and MAF are original with 164k miles plus I noticed a few ground straps not hooked up and a twist tied battery wire lol. So I’ve got some work to do tomorrow. Great video!
I did this same job to do a tuneup on my 98 c2500. Cap, rotor, etc. Be careful when removing the top of the intake, to not hit the cap on distributor and crack it. It almost touches the back. Also I was able to remove the intake (top) without removing the AC compressor. I did this by removing the top side to side instead of front to back. Nice video.
Keep these up! Great videos. Love that you have CDO, just like ODC, but in the correct order. Great information thank you so much.
Thanks, will do!
pretty cool.. just bought one not running for dirt cheap, did the fuel pump and of course the regulator lets go before it will start the first time so im doing the pressure regulator now.. and cap and wires while im around that area..
I did the same thing about a month ago on my 99 K2500. I used the bosch injestors and a new regulator.
Perfect timing. I think I can do all the dirty work, but I may need to "stop by" for the computer stuff.
I love watching this series on the 2500 'burb with 454. I just got a 2000 GMC 3500 crew cab, long bed, 4x4, 454. I've replace injectors with the Bosch replacements, pressure regulator, reworked the heads, etc (whole bunch of other stuff). I like seeing what you do and how you go about it.
Noticable improvements? I'm literally about to do the same thing with the same engine.
@@rite2beararms
Yeah, it does run a lot better. I think the regulator was my core issue, but I also had a bad injector. But I think I have a bad lifter or cam or something. The left bank runs fine, but the right bank still has an odd miss in it. It runs, just not 100%. I took everything back apart and cleaned the lifters but that didn't fix it. There were a couple that had weak-ish springs in them but I didn't think about until I had it all back together and it didn't fix it.
Are you disappointed with power in your gmc? I have the same k3500 4 door. I just rebuilt the motor and it's a slug. I put in Bosch injectors and a marine cam... its a 454 for crying out loud and it won't even pull a camper through the hills. I'm disgusted with it.
Keep it up LT.. I love that engine. I have one in my 3500 single cab dually and it has same problem.. but keep it up love the series
this makes me thankful for the ls injector rails
yup, they are much easier to work with
Dropping this exact motor into my 2dr Tahoe! It should be a fun project!
i replaced my 7.4l injectors at 120k miles. then did a sensor replacement campaign. I sold when it had 140k miles. when it was resold 2 years later it was sold as having the motor been rebuilt. Yes, it ran that smooth..... I found that there was a slight increase in power but also a slight decrease in fuel mileage. I found that mid grade fuel seems to get the best power and mileage and keep the injectors clean. After installing the new ones I started using seafoam to keep the in clean condition.
As always enjoying the videos.
Those clips are a pain but I do something similar by moving the tabs up incrementally.
I also like to change the cam sensor in the distributor since the distributor is out and you did the good cap & rotor too.
The upper intake manifold gasket tends to leak so the injector repair will fix this.
The ignition control module gets cooked on the back of the intake, so I like to replace that as well.
A straighter intake tube into the throttle body and a mild .500 lift cam will wake up the vortec.
I own 2 7.4's and 2 5.7 vortec's. Every brass terminal cap and rotor set that I have used has caused me problems within 100 miles of driving. I wish you luck with the cap and rotor LT. If at any point you get a miss or stumble I would start your diagnosis there. Keep up the good work! Looking foward to whats ahead for this truck
L21s or L29s (Gen 6) the 350s are L31s (Gen 1.5). Ozone gets cooked by arcing and corrodes the terminals
i hope I Don't have to change it that soon, they're a pain to get to...
Huge fan of this build. for a fam man with a pretty minty 97 k2500 4x4 burban L29, this build has been a lot of info to bring my 26 year old fat bottom girl up to par with modern trucks at half the cost.
I really wish you would have kept this project going. I love horsepower but this project was more something a fam man could go at. At the same time i understand turbos and burning tires get more views.
Thanks so much great video. Went in head first and fixed the problem.!
Love it! Great haircut too sir!
It is known as a labored start and sometimes a fuel pressure regulator on the engine can be the cause of the problem.
The first reg clip is found on buick series 2 3800
The 454 L29/L21 (Gen 6) was for bottom end torque, not top end hp.
23👍's up LT thanks for taking us all along with you
Keep up but i personally prefer to upgrade ignition from distributor to coil systems hope you like and change soon
As always LOVE your work!
Thanks a bunch!
Awesome! Great upgrade!
Can't wait for camshaft install. I have a big block in gmt900 platform and want to see how yours goes leaving engine in truck if that is your plan, before I dive in!! 🤭
This is Awesome. You keep inspiring me to do more on my 95 k2500 project.
Great video as always
Hi LT! love your channel thank you for all you do and share. great video. do you have a part number for the injectors you removed? its a long story why i ask.
Lt never mind I watch video to end and got my Answer on the stock injectors.
Just discovered your channel. Nice work. I have a '98 K2500 with the hard starting problem. This looks like just the ticket for fixing that issue. I do wonder though why, oh why, didn't you take a pressure washer to the engine bay and then clean up the parts before reinstalling.
I remember changing out a few sets of those even close to new
Yep!
As always job well done
Id really love to see a 0411 pcm swap video on this, got a 97 454 burban brotha and plan on doing injectors next week
Great video, thanks!
LT should invite GingerBilly to join him for some antics, and learning of course 😉
This is a good channel LT to get information, what were stock injector size ?
I know you are busy with trans problems lately, but your vids on the burb 7.4/0411 swap have been huge for me. I have a 97 k3500 L29 with high miles, so I started an upgrade by buying a complete 99 L29. I have ported the heads (290 cfm on intakes), port matched the manifold, had the stock cam reground for more lift, duration, and a tighter lobe separation angle, bought everything for an adjustable valvetrain, and a pair of stainless headers. I don't have injectors picked out yet. Someone recommended L67 injectors (supercharged 3800, 43 lb/hr). When I put in the new engine, I'm doing the 0411 swap with an 01 van L31 tune already in. From there I will follow your examples and dial it in. I'm afraid the stock MAF and throttle body will become limiting factors though. Do you know anything about the 0411 operating in speed density mode? That would let me eliminate the MAF, and even enable a real intake and throttle body, the Edelbrock efi Victor Jr.
should be no problem to run the truck in speed density at all with the 0411. I think those injectors worked out fine!
@@LawrenceTolman Can the maf just be turned off? How do I find out more?
Maybe voice over during assembly and disassembly would shorten the talking segments a little. I only say this because I remember you mentioning complaints last video. But great job amigo. I'm loving all the cool builds.
Good idea!
Had the long crack problem. Need new injector, fuel pressure regulator.
Starts first crank again. 🍾🎉
I’m replacing my injectors on the boat. Hope I don’t have to remove the Distributor that would suck. Looks like I should be able to get the rail out without doing so but it’s not going to be fun. I understand these have to be retimed with a flash tool.
After installing the higher flow rate injectors, did you loose any MPG or did it stay about the same? I'm slowly restoring my 97 K2500 GMC Burban 7.4 and I'm nervous about touching the plastic composit fuel rail because it's been discontinued for a while and there's none available in the aftermarket either. Great video!!
More power! 🤗
Keep up great work
Thanks, will do!
We need more GMT400 burb content!!
Excellent video
Thank you very much!
I am having hard starts. I tested the fuel pressure. The pump primes it fine to the valve. When I shut it off it loses pressure pretty fast. Funny thing with mine, if I let the truck sit for 2 days or longer, it starts up so fast. If I'm driving it and it sits around 10 mins or longer, it will be a super long start. So not sure how that equates in the leak down issue. Sitting long periods of time, starting is not an issue.
So did you have to tune it for those injectors
By the way stock 19lb per hour mustang Gt injectors old stlye bosche manufactured are a direct swap that will completely eliminate the start issue and burn the fuel completely where the factory 23lb hour did not. My fuel mileage and power went up truck, was more responsive. I also reached the fuel.pressure regulator at same time since it's so hard to get to.untill you get to that point of camshaft and headers the larger injectors are not going to do much to help on a stock engine.
Even better yet is the later 4 hole 4.6 yellows.
LT enjoy the videos on the L29 I have a1996 c3500 with the L29 want to do the computer swap do you do programming of computers for these swap setup for public if they sent you a 0411 computer not that familiar with the fuel injection tuning still a carb guy. Thanks keep the videos coming
Appreciate the Video, I know not the same vehicle, but do you know if this process is possible on a express van 3500 (motorhome) without removing the engine? can it be done with just the dog house removed?
The great part of the L29 is you can take the intake top off and check for dripping injectors to see if it's the cause of the long cranking.there 3 causes of that issue.leaky injectors,leaky pressure regulator or leaky check valve in the fuel pump
Susan, Lawrence, what about heat soak on the starter? Is that hype, or should i be checking this too? I dont want to change the computer so I can’t just follow through this channel exactly, but i have the same labored issue, the engine is pretty new but still exhibits this issue.
Good video but you should let people know about how hard it was to get to the bolt for the distributor
Great video thank you
Glad you enjoyed it
I've got a 2000 7.4 454. I'm having lean condition. My fuel pressure is between 45 and 50(steady). I cannot find the factory specs but my mechanic is saying that is normal. Google says it needs to be between 55-62. I want to do this swap on my truck some day.
I had a 98 chevy 2500 with the vortec 454. Its been a long time ago but i thought i used 5.0 ford injectors from bosch yellow top
God Yes man!! @18:00 min in - 😂
Thank You!! 😍 that's when I tell my ol'man - take a break, Go walk the dog for a bit, let me TIDY this up!
What Program were you using ?
FPR fixed my extended crank.
What brand is the panel removal tool you’re using to pry up the injector clips?
I'm pulling the big block out of my 99 K2500 Suburban soon. Suffered from hard starts when I bought it, new injectors and regulator fixed that but it still had a miss on 3 and 4. Compression is good on all 8, new plugs wires cap and rotor so I had to pull 3 and 4 injector and test them individually and they work fine. Not sure where the miss is coming from so any suggestions are appreciated. Love the videos, keep em coming.
Mine is missfiring also, but seems to be random cylinders and at between 25 and 45 mph mostly. No check engine light or fault codes! New plugs, new wires, new FPR, new Bosche injectors, crankshaft sensor, MAP, MAF, Idle Air control sensor, distrib cap and rotor, O2 sensors, Air Temp sensor, intake gaskets basically everything! I'm worn out from taking this thing apart and putting it back together... lol!
@@MShrader211 mine is about to get rebuilt, I'm also doing the 0411 swap and converting to coil near plug like the L21 454 had.
Dows adding the 36# injectors give the engine more horse power without any other modifications ?
I think my last mechanic did putnin 36# injectors about 5 years ago. It's a 1998 gmc suburban K2500 454 and had about 287,000 miles mow it has 389,000 miles.
Very nice
I have a 2000 chevy 454. Runs and idles great most of the time, occasionally however, whenever I need to get on it from a dig or need to accelerate while towing in 4th gear, the truck will stutter, almost like it's getting too much or too little of something. Does anyone have an idea about what this could be?
I know the video is about 2 years old but Question is it nescesary the distributor need to come out? Thanks im jyst replacing stock new injectors.
is there any way the dizzy can get messed up while doing this?
Absolute Fact! If you're gonna work on it yourself or pay someone make certain it's done 200% Correctly!!!! I can't stand when things are half assed or incomplete,etc.
Yes, I'm O.C.D. but these need to be done correctly as well as for safety reasons! If it didn't need all the bolts,etc. To work correctly and safely, they wouldn't be there from the factory! 😲💥😂
I can’t reseat the injectors.it seems like tilt one way or the other but can’t get a flush finish.
I got a k3500 with a 7.4 what other performance parts can I do to it
Can i do this to a 98 chevy k3500? Same engine. If so, is there a playlist for the whole mods/ upgrades?
wjat type of intake are u planning on using..i have a 97 4dr dually with a vortec 454 with bigger injectors an stage 3 hyper tech programmer and electric fans..
Wait... On the screenshot, it says what size engine?
This set up for Both? 5.7 & 7.4L🤔🤔
Us L29 owners are in shock that you didn't break any injector tabs... Not fair!
Do you have your 19lb/hr tune posted anywhere? Or be willing to sell it?
It would be sweet if you did some bench porting on those stock cylinder heads. Keep it looking stock and but it's packing a little extra. Hint, hint, wink, wink, nudge, nudge, know what I mean? Say no more, she's a goer
Did you happen to say where that injector data is available?
Could faulty injectors cause a stumble at highway speeds but yet it starts fine? This is on 7.4L Vortec.
super interested in this truck build!
If you really wanna impress me, show me how to change that setup with the 0411 to coil near plug and get rid of the distributor!!
hmmm... i would love to do this very upgrade sooner or later
I've done that conversation twice, hardest part was finding factory L21 valve covers for that " factory look". I would post a pic if I could, it looks great.
whats the part number for the new injectors
They also come in some volvos
Try finding a new fuel rail for the 7.4 a few months ago they were available now I can't find one anywhere anybody know where I can buy one?
Hey man I have a 454 with an issue starts. runs for a second or two. Then dies. No security light. Is there a way to bypass this problem. The truck ran fine before. Have tried everything if you're familiar with this issue
anyway I could talk you out of the tune for this setup? I have 42lb injectors but it will really help me get in the ballpark.
Hey yall i need some help because im researching for my project. (My project) the same gen6 464 as this one, complete ecm swap (holley dominator), ls heads if possible, long tube headers into a x pipe with cutouts, in-line fuel pump and some other things like updated knock sensors etc.
What king of exhaust you have on the suburban?
Yeah baby!!!
Looking good man! Dumb question - where did you get your welding table from? Looking to get one for my shed
Does the 0411 support an e85 sensor at all?