Question about 1999 Chevrolet Lumina
Rough ideal after warm up temp sensor and coolant sensor new no coolant leaks new coil packs plugs wires. no vacuum leaks and crank sensor plus cam sensor new. Still rough ideal after warm up. New map and idela control sensor new maf also. wires check out OK. compression OK fuel OK.
It could be several different things causing this, my first guess would be to look at the EGR port going into the intake. Most times it will clog up and can cause rough idling. You must know how to clean it properly, the EGR valve will have to be pulled as well as the throttle body in order to clean it properly. Also, check for vacuum leaks. It could be other things as well but this is where I would start. Hope this helps. Thanks, Allen with Morgan's Auto Repair 912-282-1602 Waycross, Ga.
Posted on Apr 11, 2014
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Posted on Jan 02, 2017
Check your fuel pressure, and or injectors. You may have too much fuel getting into the engine causing it to burn rich and overheat the converters.
Posted on Apr 26, 2009
Have you checked for vaccume leaks?
You've got lots of parts in there, Has the problem been the reason you have replaced all of those, or did it come up while doing some of the repairs?
Posted on Dec 18, 2009
did you replace only one spark plug? that can cause issues because of differences in resistances between cylinders. also, did the map code stay off after replacing
Posted on Feb 28, 2010
Make sure that there are no dis-connected wire connectors or vacuum lines, and the spark plug wires must be in the correct order, here is a firing order diagram for that engine and vehicle, and let me know if you need any help to understand this firing order diagram of if you require any further assistance.
Posted on Sep 27, 2010
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