Question about 2004 Chevrolet Express
Misfire on #8 cylinder tested plugs ok,wire ok,
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Posted on Jan 02, 2017
SOURCE: 2003 Chevy Venture misfiring
The injector is a good possibility, although you should check for spark in the wire first, as the electrical is the weakest link in the system. Put a spare plug in the end of the wire with the plug resting on metal, then have someone crank the van to see if you have spark that far, test and replace spark plug, (do not get shocked!) then look into a new injector or a good cleaning.
Posted on Jul 17, 2009
Check the plug wires with a spark tester, to see if they all spark good. That will verify all of the parts you replaced. If they look good, do a compression test on cylinder five.
Posted on Oct 06, 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
SOURCE: i have a 2001 chevy
misfires can be caused by faulty ignition components, but they can also stem from other components. Such as faulty injectors, or improperly timed or unseated valves. Sounds like you have touched on all of your ignition suspects.
Are there any codes present other than P0304, P0305 and P0306? If so they should help guide you in the right direction. If not, You might want to make sure your valves are seating and if so, go ahead and swap an injector from a misfiring hole with a good one from a hole with no misfire. (like switch #2 and #4 injectors for example) if the misfire moves to cyl 2, you know the injector is at fault.
Posted on Oct 02, 2010
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