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09-05-2003, 07:42 PM
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Hard Cold Starts on '89 3.8L
My bonneville has a real hard time starting when its cold. It kinda coughs and wants to start, it takes a few of these coughs before it fires up. Then once it briefly starts, it dies. As I attempt to start it again it might cough a little then run a little longer. Finally by about the 3rd or 4th time it gets better. Once it is warmed up it runs great and starts great, but after sitting a few hours, its is the same cycle. I've replaced O2 sensor, camshaft pos. sensor, TPS, Sparkplugs, wires, fuel pump, fuel filter. I have also let the car sit overnight and check the fuel rail the next morning and it seems to maintain sufficient pressure when i release the fuel valve. Any ideas?
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09-06-2003, 02:40 AM
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#2 | |
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The is an old tech bulletin on cold start stalls with these engines.
Most likely cause is a faulty IAC valve, If I remember right the part number for the new valve is a 17112650
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09-06-2003, 09:45 AM
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Where is the IAC valve located? Is there a way to test it and can you tell me where I can find the old tech bulletin dealing with the same problem.
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09-06-2003, 11:24 AM
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The bulletin # is 93-t-04
The IAC valve is located on the throttle body. It is round with 2 screws holding it to the throttle body and has a 4 wire connector. The best test for that problem is to scan IAC counts with a scan tool...the counts will be different each time you start and let the car idle.
__________________
Why do you never have enough time or money to do the job right the first time, but enough time and money to do it again? Got all the certifications 25 years ASE Certified Master Technician GM WCT Yea..I work at a DEALERSHIP....got a problem with that? Want to diagnose cars like the Pros? FOR SALE: OTC Perception 2 channel Labscope (badged as a Matco Reality) This is my personal labscope that I use to diagnose waveforms, like new, comes with leads and training video PM Me for details |
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09-10-2003, 03:11 PM
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Wow! I'm impressed. This car has given me hell for the last two years with the same problem. I have done all sorts of things to it EXCEPT for the IAC. Well, I must say that you are on the right track GMMerlin. I pulled of the IAC and it was stuck closed with ignition on and off. I cleaned it with carb cleaner and it began to move in and out. The car starts a hell of a lot better, it will start immediately, but it still turns off when i gas it. It does this twice before it stays on. It is giving me a service engine code 14 (CTS). I have replaced the CTS twice and the thing that i have noticed is that the car will fire up right away after i replace the CTS, but then the service engine light comes on and it continues with the same difficult starting problem. Am i burning out the CTS or is there a reset (I unplugged + batt for 10 min). Nonetheless, it does start better, but i want it perfect.
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09-11-2003, 07:09 AM
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the problem may not be the coolant sensor, but the wiring or ecm.
The coolant sensor is a 2 wire sensor..if memory serves me right, the wires should be yellow and black. Check the service number on your ECM..if it is a 1228253 (or the last 3 digits are 253) replace it (perferably with a GM part). We had a lot of problems with that part number ECM and GM did an excellent job with coming up with a remanufactored one to replace it. (I dont trust aftermarket ECM's)
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Why do you never have enough time or money to do the job right the first time, but enough time and money to do it again? Got all the certifications 25 years ASE Certified Master Technician GM WCT Yea..I work at a DEALERSHIP....got a problem with that? Want to diagnose cars like the Pros? FOR SALE: OTC Perception 2 channel Labscope (badged as a Matco Reality) This is my personal labscope that I use to diagnose waveforms, like new, comes with leads and training video PM Me for details |
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09-12-2003, 12:49 PM
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The ECM has already been replaced. The Temp sending unit is a 2 wire and the CTS is a single wire. Both of these have been replaced. How many volts or ohms should be in the CTS wire?
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