1996 Chevrolet Tahoe 8 Cylinder the engine misfire when start up after it been sitting for a while i can drive it down the road and press on the gas real hard and the miss will go away until the engine sit for a while again and then it do the same thing i replace new spark plugs and wires distributor cap, when i replace the distributor cap it didn't miss for about 6 or 7 month and it start misfire again i replace the cap again what could be causing the misfiring? how do i fix this problem?
Could just be a loose spark plug wire. Depending on how long it's been sitting animals tend to hide under the hood may have knocked it loose. Drive it to orileys or autozone and they can scan your computer if you have a check engine light on which in my experience with a misfire it sets off the check engine light or your gas could be old also.
My guess is weak ignition coil. As a test, try gapping plugs 0.010" shorter. Dont change anything else, except plugs if fouled. If it runs without miss, just run shorter gap.
Testimonial: "how to test the ignition coil?"
"how to test the ignition coil?
You can measure the coil primary and secondary resistance but likely the readings will be ok.
Reading high voltage in circuit requires special probe and a scope. So gapping plugs shorter is a diagnostic method that doesnt require special equipment.
If a shorter gap abates misfire, then replace coil. But small possibility it can still be other cause.
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Leaking fuel injectors
SOURCE: 1998 chevrolet k1500 pickup 305 a misfire in # 2 cylinder
hi there, if you can feel the misfire at an idle but not at a higher rpm than the fuel pressure regulator is bad im working on one right now that has mifire code and random misfire codes coming up
SOURCE: cylinder 2 misfire
One often overlooked item is the spark plug leads themselves! They don't last forever - Some start breaking down internally after only a couple of years, and although you still get a spark at the plug, it is not a very healthy spark.
If they haven't been changed, it is well worth giving it a go.
Hope this helps!
SOURCE: #6 cylinder misfire
could be a vacuum leak around the intake manifold. with enginerunning spray car cleaner around intake if rpm changes then there is a leak
SOURCE: What could cause MISFIRE CYLINDER 8. I already
Do a cylinder leakage / leak down test to determine if the valves and seals are leaking.
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Bad miss at idle?
http://technoanswers.blogspot.com/2012/01/bad-miss-at-idle.html
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While stop engine idles
like cylinder missing?
http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html
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Engine Misfire codes for
car?
http://schematicsdiagram.blogspot.com/2011/12/engine-misfire-codes-on-chevrolet.html
Engine Misfire codes?
http://schematicsdiagram.blogspot.com/2011/12/engine-misfire-codes-on-chevrolet.html
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Misfire on cylinder 4?
http://schematicsdiagram.blogspot.com/2011/12/misfire-on-cylinder-4.html
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Oil on spark plugs and car misfires?
http://technoanswers.blogspot.in/2012/02/oil-on-spark-plugs-and-car-misfires.html
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This will help.
Thanks.
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