Question about 1990 Chevrolet K2500
It ran smooth until I parked it for the summer when I went to start it again it sounded like the timing was off, backfiring and won't idle
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Posted on Jan 02, 2017
See if there is a code in the computer and work from there. Find someone with an OBD2 code reader. If I'm not mistaken an OBD2 code reader works on 1996 and newer models. Could be a bad coil and you don't notice it when you first start it until it idles down, to check for that, while the engine is running, pull each wire off the spark plug, Each time you do that you should hear the engine struggle. Then pick back up once you plug it back to the spark plug. If you pull one and nothing happens to the engine, that could be all or part of the problem. Hope this helps.
Posted on Nov 24, 2009
If the only problem is idle and it runs grat above ide then the most likely component is the Idle Air Control valve. This is providing you have no codes stored indicating something else.
Posted on Mar 13, 2010
SOURCE: vortec 350 knock on start-up.
Is it a ping or a knock? It could be the initial timing is not set correctly. Are you losing coolant? It could be a leaking head gasket and is leaking a small amount of anti-freeze into one of the cylinders. If it is a bearing it will get worse and worse, is the oil pressure good? I guess I'd take it back to the rebuilder.
Posted on Mar 27, 2010
P0171 - is fuel system is to lean (Bank#1) Take the car back to who ever scanned it for you and see if any codes are now pressent in particular to the EGR Valve they range from P0400 up to and including P0409, or any other new codes.While you are at it make sure they erase the set code P0171 un less it is already don.If no codes show up on the new scan replace the Ignition Control Module not the ( ECM -on board computor).If new codes do show up follow up on them first. Good Luck.
Posted on Dec 08, 2010
I know there are a lot of solutions here but I would concentrate on a couple of known issues for the 99 4.3l engine. Remove the distributor cap and rotor, check the reluctor wheel under the rotor and make sure it is not loose on the distributor shaft. The other issue is a worn distributor gear, you will notice a lot of freeplay when you try rotating the distributor rotor back and forth.
Last but not least, spray the inside of the distributor cap, the rotor and the inside of the distributor, this will remove and prevent moisture build up causing the backfire issue you are experiencing...
Posted on Oct 23, 2011
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