Question about 1992 Chevrolet Caprice
I have a 1992 chevy caprice that starts up idles low/missing and dies when it reaches operating temperature. ive changed the fuel filter, tps sensor, iac vavle, fuel pump, and rebuilt the throttle body,ac delco park plugs and wires put in, distributor cap and rotor key also replaced. i also checked for vacuum leaks and found none. what else can be the problem?
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Posted on Jan 02, 2017
Spray the intake with carb cleaner to find the vacuum leak. Check where the EGR mounts and the throttle body gasket sense you had both off.
Posted on May 10, 2009
do you get check engine codes?..have you done a leak down test and compression test to determine mechanical engine health?
Posted on Oct 07, 2008
My problem was solved when I repaired my 4 wd activation dash switch. The switch was contacting on 2WD & 4HI at the same time. The front differential activation is vacuum activated possibly creating a tug of war that didn't actually engage it but drained off vacuum from the engine? A theory at best but stumbbled across it because I knew the switch wasn't working properly I repaired it and low and behold rough idle disappeared and all is good for 3 weeks running.
Posted on Dec 10, 2008
Tips for a great answer:
Here are the more 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
Mar 22, 2014 | 1992 Chevrolet Caprice
Dec 13, 2013 | 2000 Chevrolet Silverado 1500
It can be issue
with IAC( idle air control valve) causing the problem.
are many other possibilities causing these idle issues. Engine idles rough.
are few help links with solutions to troubleshoot such idle issues.
suggest you refer the link below and follow
its troubleshooting details:------
the link below:-----
Cold start problem and vehicle shudder around 2500 to
details will help.
Dec 07, 2012 | Cars & Trucks
Oct 14, 2017 | Cars & Trucks
The engine and transmission in this cars drive train are fully electronically controlled by a computer called the PCM (Power Train Control Module). Whenever a problem like this occurs the computer stores a record of the problem (there are of course some exceptions to this, like the fuel pump, engine coolant temperature sensor and MAF sensor for instance) in the form of a fault code in its memory, to read these fault codes you must have the systems memory scanned with a special tool. Once the fault code(s) are read you then must perform the appropriate diagnostic testing to find and resolve the problem(s) DO NOT REPLACE ANY PARTS UNTIL A TRAINED TECHNICAIN HAS DIAGNOSED THE PROBLEM TO AVOID SPEDING YOUR HARD EARNED MONEY ON PARTS THAT MAY NOT CORRECT THE PROBLEM
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