Question about 1993 Chevrolet Caprice

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93 caprice starts right up for a minute or two until it starts to warm up then it idles ruff hi lo hi lo until it will die. Replaced fuel pump sending unit and fuel filter last year tried mapping system no luck can't find any vacuum leaks ca don't know what else it can be car starts back up win no problem until it starts the whole process over again

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  • 24 Answers

I would guess one of three things is your problem . 1) is as mentioned by greg_margo is the egr could be stickin or not getting vaccum .2) is the iac ( intack control valve) located n your tbi carb base right rear corner of carb . or your carb base gasket is bad seen this many times with th early 90's caprice weather its a 4.3 5.0 or 5.7litre engine . worked n many of these and still have do as I work for a co. that still has one with over 400,00 mile and still running strong same engine 5.0

Posted on Nov 21, 2014

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Posted on Jan 02, 2017

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SOURCE: Car starts fine..Idle is fast...stalls after car warms up

Check for vacuum leaks. Also try cleaning the ISV.


If that doesnt work go to vwvortex.com and post your issue there

Posted on Jul 08, 2009

greg_margo
  • 1959 Answers

SOURCE: Rough idle and acceleration on 1998 Chevrolet Silverado 5.0

Bad EGR valve comes to mind here. Assuming the plugs are good, the EGR valve woiuld be what I'd look at.

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Posted on Jul 26, 2009

  • 1 Answer

SOURCE: 93 chevy lumina euro won't stay running

sounds like it could be a fuel injector shorting out. have to get it hot, pull off the plenum and check the resistance in each injector. if any injector has bad resistance, replace it. when an injector shorts out on these particular vehicles, it shorts out the whole injection circuit. and when it cools off the resistance goes back up and it will run ok. i think the correct resistance should be about 13 ohms.

Posted on Mar 19, 2010

  • 46 Answers

SOURCE: 1991 deville idling very ruff

Hi you should change the coolant temp sensor this is a white sensor on top of the intake and is part ot the computer system.

Posted on May 19, 2010

  • 34 Answers

SOURCE: 89' honda civic lx dies after 10 minutes or warms up?

it is probably your distributer. It has a internal amplifier and when it gets hot, it quits working.

Posted on Oct 31, 2010

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Car: 94 Chevy caprice, 5.7L engine/port fuel injection Problem: very hard cold starts, rough idle at cold temperatures and stalling at low idle(when able to start after minutes of continuous cranking)...


Have your temp sensor checked. It may not be setting off a code but a sign of a failing temp sensor is hard starts, rough idle, until the car heats up. It sends a code to the ECM to help adjust fuel mixture. If it sends gals readings, the computer will adjust the fuel-air ratio and cause vehicle to run too lean until warmed up. Some people have had to keep pumping the gas pedal to keep it going from a bad temp sensor.

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TRY THE FUEL FILTER FIRST IF THE FUEL PUMP WAS GOING BAD IT WOULD STALL AS YOU PUSH ON THE GAS PEDDLE AND PUMPING THE PEDDLE WOULD NOT HELP FUEL INJECTION AND PUMPING THE GAS WILL HAVE NO EFFECT ON THE RUNNING OF THE VEHICAL

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1991 deville idling very ruff


Hi you should change the coolant temp sensor this is a white sensor on top of the intake and is part ot the computer system.

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