Question about 2003 Chevrolet Impala
Rplaced: Fuel Filter Cat Converter O2 Sensor MAF Sensor Plugs Wires Ignition Module PCM Upper Intake Manifold and related If I hold RPM steady and elevated it runs smooth and code vanishes. Any load or idle causes rough run and then quits. WTF?
Unplug the fuel pressure regulator and see if fuel is leaking into the intake or check the fuel pressure also try unplugging the map and mass one at a time and vice versa this engine should run off either one when a one or the other has an open circuit no mention of coil packs did they test good you should get a good 50kv bright blue spark from each terminal min of 30 kv if you dont have a tester thats about 1/2 in or better in length be careful coil packs can produce enough amperage to kill you
Posted on Dec 05, 2012
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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
ethanol gas problem. add a can of SEAFOAM to tank of Premium gas. change fuel filter after 100 miles. then add SEAFOAM 3-5000 miles to keep fuel line/system;emissions, and valves clean of ethanol goop and water which is created by this awful ethanol mixture.
Posted on Aug 31, 2009
a car that idles rough and clears up is the sure sign of an o2 sensor shorted this may not give a code if the short in the sensor is bad the computer will eliminate its input to protect itself
Posted on Sep 03, 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
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