Question about 2005 Hummer H2

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H2 hummer. 2005 changed plugs and wires still getting misfire po301 now it is po300.

Details on what the misfirer could be besides replacing plugs and wires last month and about 2 years ago plug, wires and coil packs......plus getting po140 and p2a01 witch is o2 sensor that was changed less than year ago so ill have to do again. then getting service 4 wheel drive.... what does this entail?

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  • Hummer Master
  • 1,381 Answers

Maybe throttle body?

Posted on Dec 15, 2016

Testimonial: "cleaned throttle body earlier before changing fuel pump and maf sensor and map sensor. less than 2 months ago"

  • paula
    paula Dec 23, 2016

    could this also cause misfire and problems with fuel gauge if it is dirty.. should i use seafoam or berrymans to clean

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1 Answer

Have a 2009 Mazda CX-7 cylinder 3 misfire already change the coil pack last month and spark plugs ran fine after that now its reading cylinder 3 misfire again


Check to see that plug wire is fully seated on plug and coil pack..Then, pull plug to see if fouled due to not firing when pack was bad.

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Can catalytic converter on 98 Pontiac grand prix cause misfire on cylinders in car


No, a plugged converter would cause the engine not to breathe properly. Too much back pressure would stall the engine or make it run very poorly. It would not be local to any one cylinder-all of them would be affected.

To diagnose a misfire in one cylinder, well, you start at that cylinder. It could be ignition related- the spark plug and spark plug wire for #6, possibly the ignition coil for #6 in the coil pack for the engine. (A v-6 would have 3 coils in the coil pack, one coil for 2 cylinders.) It could also be fuel related, so the fuel injector for cylinder 6 should be considered. And the last reason for a misfire is usually the most expensive repair: low compression in #6. This may be a head gasket problem, or a piston ring problem, or one of the valves for #6 may not be sealing well, causing low compression and the resultant misfire. The engine computer codes a misfire when it senses low power output from that particular cylinder. The misfire causes a lag in crankshaft rotation, and the crankshaft position sensor senses it.

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Why do new spark plug coils go bad ?


coils, it has just one coil pack. with 3 coils integrated.
its not COPs.
there are many DTCs related, and not posted.
did you try new spark plugs, then new wires. and then only last the coil pack? check compression.
is it failing the same cylinder? (the will fail in pairs, if the pack is bad)
the pack runs 2 cylinders at once (in series)
injectors leaking or clogged.
since you didnt show the symptoms, i cant help much.


how.?
1 month or 1 year?, or how many miles?
answer 1
time, heat,vibration, oil contamination. (pressure washing them)
not using the dielectric grease on the boots.
getting water in the wells over and over, causing flash over , and carbon tracking.
what make you think they are bad.???
my guess, is you see P03xx codes and assume the means bad coil.?
post symptoms.
post scan data, and DTCs.

May 21, 2014 | Jeep Cars & Trucks

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Misfire on Cyl 2 and 3..98 Camry


the only thing left to replace would be the spark plugs -I would do all the plugs-cheers Denny

Nov 16, 2013 | Toyota Cars & Trucks

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Check engine light came on last week. They said it was the heated oxygen sensor. I had it replaced and today the light is on again. The code at Auto Zone is P2096 and P0300. It says P0300/P0301/P0302...


Yes a misfire could cause a false 02 code. As far as why it's misfiring could be a plug and wire issue but hard to say without looking at it

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2 months ago i replaced all the spark plugs and coil packs on my 2003 mazda 6. yesterday my car started acting the same way as when i needed these things replaced and today the check engine light went on...


I don't know how many miles you have on your car, but it is possible that you may have a spark plug being fouled out either with oil or coolant. I had a Protege with 120k and it burned more oil than gas. Change #3 plug and get a good look at the plug you remove. Look for signs of contamination.

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Code P0300 on a 2002 Pontiac GP with misfires on # 1&3. replaced plugs & wires checked coil packs. this occurred after the car stopped along side road with bad water pump.


try switching one of the other coil packs with one of the bad ones. if this works then there you go. another way of telling if it is a coil pack is to disconnect the spark plug of the affected coil pack. if its a strong coil then you will hear the spark as well as see it. compare it to another plug boot that has the good spark. it sounds to me that it is a coil pack. i just changed one about 2 months ago with the same problem as yours.

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1 Answer

04 Sedona 3.5 cyl #2 misfire replaced coil,back again 5 mos later


How many miles on the plugs and wires? Misfire can be caused by either plugs or wires, after that check the injector for that cylinder. Let me know what u find. Curt

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