Very good information! and the table about temperature vs ohms is was key in mi case, because I connected a resistor for 90°C 250 ohms (simulated a Engine too hot) and the TBI reduce the gas injection so can see the pin connection need a good connection. To fix the open circuit It was necessary strength the pins between the sensor and the connector and the circuit go to close.
Just bought a beat up 89 k1500 and was getting this error code. There are coolant temp sensors on the both sides of engine that I thought were causing the problem so I changed the one that was hooked up to a lead. This turned out to be the sensor for the gauge. After watching your video I checked the location and found that the original sensor wasn't even connected and was completely shot. Replacing that today and hoping it clears. Thanks for the great vid.
Sir could you tell me what the sensor on the passenger side manifold is? What the connector looks like and where the wire runs. If you could make a short video. It would help us chevrolet dually owners out.
I just happened upon this video today. Can you please advise the book you was using in this video, I have never seen one so descriptive and informing about DTC codes. I own a 1991 C1500 and a 1994 C1500, I love these trucks. Any help on the book and where it may be purchased is greatly appreciated !
@@farmboysgarage7595man I pray that you could help out of that book pls I've ant getting pulse to the injectors Im getting code 12 and I put new fuel pump in fule pump relay and fuse new distributor and module throttle position sensor oxygen sensor EGR valve EGR sensor reset timing map sensor ECM box EGR valve EGR sensor. And I don't have no one to help me just me haven't had a truck in 2 mouths lost my job over it thank boss
@@CraigB-rw9cusounds like you’ve replaced a lot of stuff. The ECM would be my prime suspect but you’ve replaced that too. I’d start looking at wiring integrity. Check power and ground to the ECM and all connections that could be corroded, wires rubbed, mouse chewed, etc. good luck
Great info very helpful i had an issue with 95 s10 2.2l it has a obd2 port but needs a obd1.5 reader .. Turns out you can jumper ports 5 an 6 it will give codes just like your truck
Thanks for the video. I have obd1 code 15 on my 91 S10 4.3. I don't have any power coming to the temperature control sensor plug. Is it supposed to have power to it at all times when switch is on? Thanks.
I had the same issue. Was scratching my head because I changed mine too. Was messing around with the plug and the realized that the spades were spread apart. Compared it to a new one and it was. Changed the pigtail and it solved the issue!
So if you don't have the meter did you say to unplug it and then start it and see if it registers hot or a hundred and thirty degrees I don't get it can you explain that better.
I don’t have it in front of me but I believe it was a GM manual on emissions and fuel issues. I don’t believe a coolant temp sensor would cause a no-start. It would make it run rich if it was reading low.
I have this code, but my engine is surging having a hard time running, I cleaned cap and rotor, I checked wires with soap spray at night and the plugs are new, I pulled the egr off to see if it was stuck and it's not. Why would this code be causing the motor to run rough?
The PCM uses the engine temperature to adjust fuel/air ratio. When the engine is cold, it has a rich fuel/air ratio and when it warms up, it leans out. If the PCM thinks the engine is cold when it's hot, it will add too much fuel and run rich. I'm not saying this is what is causing your issues though. Can't always go by trouble codes on these old trucks as they only show codes that affect emissions.
@@farmboysgarage7595 Well it does this when the motor is totally cold......see I bought this van with this problem, I dont know how it ran before, but I do know it had a motor change at some point because it's a gm Goodrich crate 305 and the van is 1987, the inspection is from 2 years ago and reads 207,xxx miles. I first assumed 107,xxx because of the odometer
@@tlmapp22 I got the issue resolved, it was just that, even though the plugs were brand new from when I got the van, they were shot. I tested them raw.....some had a weak spark and some didn't spark at all. So I replaced all the plugs and it ran good but still had service engine soon light, so I tested the CTS sensor, it the sensor is working properly it will start out at 5 volts then as it warms up will come down to 2 volts. My CTS sensor was bad, it never came down so that's what was killing my plugs and turning on service engine light. So now it is fixed, but it gets horrible gas mileage, so I now have to check timing, but my ultimate goal is to build a 350 with some swirl port heads with porting, a good 450/460 lift cam and flat top pistons to put me at 9.2-9.3 compression and probably just a edlebrock rpm with 600vs quick fuel carb. Alot of people don't like the fact of removing the TBI, I hate the computer.....it compensates for problems or fuel/air delivery and over rides your foot. A carburetor can be set to a standard fuel consumption putting you in alot more control of what the motor consumes.
Hey man. I appreciate this video. Trying to go any direction at this point. I'm restoring an 89 k2500. When I unplug the wire, and connect terminal 410 and 452 with my ohm meter, I get 0 ohms. There's 0 resistance. Do you know what this means?
I like the location a lot better on your truck, ha I busted off my coolant sensor twice changing out plugs. You'd think I would learn the first time, oh no that's too easy. LOL
+Shakes 73 Not really a re-upload except I included the part about how to get the code (which come to think of it I should've just made a video on). Code 14 is set with a high temp and code 15 is set with a low temp. I like the simpler systems. The OBD2 systems have too many sensors in my opinion.
@@farmboy30117 well not really because I finally figured it out it was the electronic spark ignition box next to the throttle body the big one and I e read on line yes 12 can mean that but it can mean that it's telling me it's not getting spark or something like that to the distributor to ECM to that box but ya that's what it was lol and I tell you I've put soooooo much money in that thing it's crazy I paid 2800 for 3 years ago and I've put 2000 in it not counting gas lol over the years. But any hooooos like vice grip garage says lol lol it's fixed and it's time for something new so I wrote down everything I did to it because that's what everyone should do before saleing or trading for something else because yuns if someone doesn't it really makes it ruff for the next person so pls pls do so. Okay well seek the LORD YAHUWA while yuns still can I see 2 Timothy 3:8 playing out and I see people doing the opposite of psalms 146:3 and the gov and anyone that works for them not doing the things there not supposed to corruption is bad people follwoing Lucifer and his little minions and pay for it in the end the lake of 🔥 is real with no way out no one to save anyone that follows them and torment forever.....
![👨🔧Como sacar codigos obd1 chevrolet y GMC 88 - 95 [SIN ESCANER]](http://i.ytimg.com/vi/joa-x75BdHU/mqdefault.jpg)
I appreciate how you have the book and the engine compartment side by side and walk through. Thank you!
Hey I really love all of your videos you've been a great help in each and everyone you explain it so well so keep up the good work farm boy God bless
Awesome video very informative straight to the point. Thank you very much.
Very good information! and the table about temperature vs ohms is was key in mi case, because I connected a resistor for 90°C 250 ohms (simulated a Engine too hot) and the TBI reduce the gas injection so can see the pin connection need a good connection. To fix the open circuit It was necessary strength the pins between the sensor and the connector and the circuit go to close.
Glad it helped!
Just bought a beat up 89 k1500 and was getting this error code. There are coolant temp sensors on the both sides of engine that I thought were causing the problem so I changed the one that was hooked up to a lead. This turned out to be the sensor for the gauge. After watching your video I checked the location and found that the original sensor wasn't even connected and was completely shot. Replacing that today and hoping it clears. Thanks for the great vid.
Thanks Tim! Hope it fixed your issue!
Im getting a code 15. My voltage at the plug is 4.5 v with the key on
Sir could you tell me what the sensor on the passenger side manifold is? What the connector looks like and where the wire runs. If you could make a short video. It would help us chevrolet dually owners out.
Appreciate the troubleshoot procedures
I just happened upon this video today. Can you please advise the book you was using in this video, I have never seen one so descriptive and informing about DTC codes. I own a 1991 C1500 and a 1994 C1500, I love these trucks. Any help on the book and where it may be purchased is greatly appreciated !
It was the emissions and fuel system troubleshooting manual by GM. I found it on eBay.
@@farmboysgarage7595 Can you send it to me in pdf format or at least the same site
Great video. By the way what book is that you are looking at? Thanks for any info you can provide.
I like those systems , pretty simple and work well
+Rusty “rustyglovebox” Glovebox Thanks Rusty. I feel the same way!
@@farmboysgarage7595man I pray that you could help out of that book pls I've ant getting pulse to the injectors Im getting code 12 and I put new fuel pump in fule pump relay and fuse new distributor and module throttle position sensor oxygen sensor EGR valve EGR sensor reset timing map sensor ECM box EGR valve EGR sensor. And I don't have no one to help me just me haven't had a truck in 2 mouths lost my job over it thank boss
@@CraigB-rw9cusounds like you’ve replaced a lot of stuff. The ECM would be my prime suspect but you’ve replaced that too. I’d start looking at wiring integrity. Check power and ground to the ECM and all connections that could be corroded, wires rubbed, mouse chewed, etc. good luck
Great info very helpful i had an issue with 95 s10 2.2l it has a obd2 port but needs a obd1.5 reader .. Turns out you can jumper ports 5 an 6 it will give codes just like your truck
Thanks Chris!
How to clean a trotlle body on 94 chevy c2500
Thanks for the video. I have obd1 code 15 on my 91 S10 4.3. I don't have any power coming to the temperature control sensor plug. Is it supposed to have power to it at all times when switch is on? Thanks.
I had the same issue. Was scratching my head because I changed mine too. Was messing around with the plug and the realized that the spades were spread apart. Compared it to a new one and it was. Changed the pigtail and it solved the issue!
So if you don't have the meter did you say to unplug it and then start it and see if it registers hot or a hundred and thirty degrees I don't get it can you explain that better.
May I ask what book you have there sir? And also would a coolant temp sensor code cause a no start on my 94 5.7 350??
I don’t have it in front of me but I believe it was a GM manual on emissions and fuel issues. I don’t believe a coolant temp sensor would cause a no-start. It would make it run rich if it was reading low.
I have this code, but my engine is surging having a hard time running, I cleaned cap and rotor, I checked wires with soap spray at night and the plugs are new, I pulled the egr off to see if it was stuck and it's not. Why would this code be causing the motor to run rough?
The PCM uses the engine temperature to adjust fuel/air ratio. When the engine is cold, it has a rich fuel/air ratio and when it warms up, it leans out. If the PCM thinks the engine is cold when it's hot, it will add too much fuel and run rich. I'm not saying this is what is causing your issues though. Can't always go by trouble codes on these old trucks as they only show codes that affect emissions.
@@farmboysgarage7595
Well it does this when the motor is totally cold......see I bought this van with this problem, I dont know how it ran before, but I do know it had a motor change at some point because it's a gm Goodrich crate 305 and the van is 1987, the inspection is from 2 years ago and reads 207,xxx miles. I first assumed 107,xxx because of the odometer
Farmboy's Garage this sounds exactly what my 91 Silverado is doing. What would be my best solution? Replace PCM?
Joshua Gerlitzki sounds like my issue. Did you find a solution?
@@tlmapp22 I got the issue resolved, it was just that, even though the plugs were brand new from when I got the van, they were shot. I tested them raw.....some had a weak spark and some didn't spark at all. So I replaced all the plugs and it ran good but still had service engine soon light, so I tested the CTS sensor, it the sensor is working properly it will start out at 5 volts then as it warms up will come down to 2 volts. My CTS sensor was bad, it never came down so that's what was killing my plugs and turning on service engine light. So now it is fixed, but it gets horrible gas mileage, so I now have to check timing, but my ultimate goal is to build a 350 with some swirl port heads with porting, a good 450/460 lift cam and flat top pistons to put me at 9.2-9.3 compression and probably just a edlebrock rpm with 600vs quick fuel carb. Alot of people don't like the fact of removing the TBI, I hate the computer.....it compensates for problems or fuel/air delivery and over rides your foot. A carburetor can be set to a standard fuel consumption putting you in alot more control of what the motor consumes.
Bad grounds can drive you crazy
What symptoms did the truck have.
Hey man. I appreciate this video. Trying to go any direction at this point. I'm restoring an 89 k2500. When I unplug the wire, and connect terminal 410 and 452 with my ohm meter, I get 0 ohms. There's 0 resistance. Do you know what this means?
Bad pigtail.
What book are you using? Thanks for the buddies!!
Gm shop Manual for the vehicle.
I like the location a lot better on your truck, ha I busted off my coolant sensor twice changing out plugs. You'd think I would learn the first time, oh no that's too easy. LOL
+STEVE ROB Haha, sounds like it's in a bad spot. Hope they weren't expensive to replace ;)
Amigo podria ayudarme. ¿ que manual esta tu usando ?
Debe ser obd1 o obd1.5
Re-upload? I really like the OBD1s they were much simpler but the OBD2s give a lot more information with scanners.
+Shakes 73 Not really a re-upload except I included the part about how to get the code (which come to think of it I should've just made a video on). Code 14 is set with a high temp and code 15 is set with a low temp. I like the simpler systems. The OBD2 systems have too many sensors in my opinion.
@@farmboysgarage7595 if you have the temperature sensor wired backwards? You will get a code 15. Good luck!
why will my 1990 truck wont work with a key like you are showing why any one kn ow ??
But they do say about 12 i read it mean theres no distributor to the injectors what Google says but thought id ask you
Code 12 means the computer is working. After it repeats 12 3 times then it shows the codes 3 times. After any code it shows code 12 3 times
@@farmboy30117 well not really because I finally figured it out it was the electronic spark ignition box next to the throttle body the big one and I e read on line yes 12 can mean that but it can mean that it's telling me it's not getting spark or something like that to the distributor to ECM to that box but ya that's what it was lol and I tell you I've put soooooo much money in that thing it's crazy I paid 2800 for 3 years ago and I've put 2000 in it not counting gas lol over the years. But any hooooos like vice grip garage says lol lol it's fixed and it's time for something new so I wrote down everything I did to it because that's what everyone should do before saleing or trading for something else because yuns if someone doesn't it really makes it ruff for the next person so pls pls do so. Okay well seek the LORD YAHUWA while yuns still can I see 2 Timothy 3:8 playing out and I see people doing the opposite of psalms 146:3 and the gov and anyone that works for them not doing the things there not supposed to corruption is bad people follwoing Lucifer and his little minions and pay for it in the end the lake of 🔥 is real with no way out no one to save anyone that follows them and torment forever.....
Amazing great work
Real insight
Book?
What book do you have?
It's a Chevy factory fuel and emission repair manual for '93 trucks.
What book is that?
Chilton
Run fuel injector cleaner in the tank to clean injectors and valves.
Thank you
That looked like a copy of the last video but I don't think it was. :)
+mossman381 Well the part about how to find the codes was ;)