Question about 1989 GMC S-15 Jimmy
These trucks were equipped with a TBI, (Throttle Body Injector). This looks like a modified Carburetor with two large fuel injectors placed over a two barrel throttle plate and venturi body. You need to check the base gasket on this TBI Unit. The base gaskets were notorious for becoming brittle and cracked . If you remove the air cleaner and open the throttle plates you may see a chunk of black hanging out down below the throttle plates. If you see this, this is the base gasket and it cracked and needs to be replaced.
The Idle Air Control Solenoids were also an issue on these truck too. This is a round part that will have a plug on it normally near the base of the TBI Unit. This will just require a quick replacement.
The last thing that it might be is the electronically controlled EGR Valve. This valve used to cause some trouble from time to time, and I know there was a warranty campaign on these parts. the valve will need to be replaced or cleaned if this is the case.
Good luck and hope this helps friend, Keep me posted and here is a link for you to retrieve DTC codes. http://www.troublecodes.net/GM/
Posted on Jul 01, 2009
I have a 1985 gmc jimmy 4x4 and the idle is really high. I cant get it to come down. Usually it does that when it is cold,but then i hit the gas and it fixes itself. Now it is not? Please help!!
Posted on Aug 03, 2009
It comes down to three things, fuel, ignition and air intake. Most likely you are having a fuel problem. You might start off with a fuel filter. If you continue to have trouble you may want to check fuel pressure. It's possible that the suction filter, inside the tank, could possibly be plugged up. Good luck. Please rate this. Thanks
Posted on Jul 01, 2009
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Posted on Jan 02, 2017
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