Question about 2003 Chevrolet Impala
05 Impala 3.8 missfire code 301 have changed wires,plugs,coil,ignition mod, injector,fuel pump,fuel pressure reg changed still don't hold pressure with key on still has missfire code. help
Check intake for vaccum leaks,the gasket also and egr valve, thats alot of parts to have replaced without diagnosing first, if there are no fuel leaks and you said all injectors were replaced then you have a defective fuel pump, also these engines had misfire problem because of dirty injector but you replaced them so count that out. good luck.
Posted on Nov 02, 2009
If the regulater and or the fuel bar do not hold pressure I would check the fuel lines to the pump from the regulated there could be a small air leak!
Posted on Feb 28, 2015
If the engine is not miss fireing i would check for a program update, for ecm.next you could have crank sensor bad or a crank sensor camshaft sensor miss correlation.i would go visit the chevy dealership.hope this helps
Posted on Nov 04, 2009
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Posted on Jan 02, 2017
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