Question about Chevrolet C2500
Chec idle contol motor 1st-may be worn or dirty--to be certain do a scan or data stream with pro gear from a shop-not a dealer--u dont want to replace parts by guessin-----getta haynes manual for repair details
Posted on Jul 27, 2013
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Posted on Jan 02, 2017
This could be a number of things but i think that your problem sounds like a vacuum leak or an EGR problem. Try listening for leaks and try un-plugging the EGR solenoid valve one time.
Posted on Apr 17, 2009
I had the same problem and found the idle screw was hitting a small shock absorber that had worn out and wasn't allowing the rocker arm to release all the way. Now i just need to find a replacement part for this 20 yr old truck, right.
Posted on Apr 23, 2009
You can clean the EGR. No promise it will work. I have an idle problem on my `97 Grand Am Se. Shop told me I could clean it and it might solve my problem.
Just remove the EGR with the 2 bolts from the top of the manifold behind the throttle body if you have a 3.4 v6 like I do. Then leave it upside down with throttle body cleaner in it. Fill the EGR level with cleaner and let it soak for at least 30 min or more. Then reinstall.
This will remove any carbon on the inside which plugs the needle from pushing out at highway speeds. Hope this helps. If the problem returns in a week or so then replace with new EGR. New EGR is about $100-200! Cleaning seems to have helped my car did that about 3 weeks ago.
If you have a service engine light on turn the key to the run position on the ignition, pull the fuse to the ECM (batt) and disconnect the wire harness to the EGR. Reinstall it after a 1 min, That will clear all the codes in the ECM and reset everything.
Once you place the ECM fuse back in, start the car. It may stall but let it, DO NOT TOUCH ANY THING. The ECM need to relearn the EGR and engine from all it's sensors like the first time it was started. Just start it up again and it should be like the day it came off the assembly line and will relearn everything.
Good luck and just drive it like you always. If you decide to change the EGR valve, you still need to clear the ECM as mentioned above for the ECM to relearn the new EGR valve. Hope this helps and keep me posted.
Posted on May 25, 2009
SOURCE: Car shuts off when I stop
Try cleaning the two cross wires inside the mass air flow sensor. (use Q-tip and carb cleaner) It is also possible that your oil pressure switch has a low pressure cutoff feature. If the pressure is low at normal idle, it will shut the engine down. Check oil pressure with a mechanical gauge and if it's good change the sending unit. (check to see if voltage flow through switch stops just at shutdown first though)
Posted on Oct 13, 2009
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