Question about 1990 Chevrolet Corvette
I have 1990 Corvette 5.7L Automatic, 22000 mile, that runs fine when I get on the gas but surges on slow idle and almost seems like it's going to stall. Come to a light or stop sign, I have to put it in neutral or park so the idle will be a little faster to solve the slow idle problem. This only happens when it is warmed up and the slow idle drops to 500 rpms. I replaced the following parts and the problem still exists:
Coolant temperature sensor
Throttle postition switch
Cleaned the throttle body
No codes are present in the ECM. I would appreciate any help you can give me with this problem
I had almost the same problem i changed my fuel pump and fuel filter and it worked u mite try that first.
Posted on Feb 10, 2010
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Posted on Jan 02, 2017
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Feb 05, 2016 | 2002 Jeep Grand Cherokee
Here are the common cause of surges, stalls at stops, slow idle speed, erratic idle, it is in most cases the idle speed control air-bypass valve and/or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving
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