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Missfiring on one cylinder

Missfiring on one cylinder good clean injecters good plugs plenty of spark from coil full electronics getting to injecters

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Sounds like you have covered all the basics except the plug wire which might be bad.....the plug wire goes "deep" into the head & u cannot see the end of it r somewhere close 2 the end that the wire is shooting fire out of the side grounding itself to the head before the spark plug...look for a very small burn mark on the side of the wire after running the car or while running,lay the wire on the head lookfor a spark out the side of it.Good Luck!!!!!! P S BEEN THERE 7 DONE THAT!!!!!!

Posted on Jan 31, 2010

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2005 Jeep Cherokee miss fire on fifth cylinder


Pull the spark plug to see if it is oil fouled, preventing firing. If it is, you may have a mechanical problem in cylinder 5- do a compression test to check for low compression in that cylinder.

If plug is clean or only showing black sooty deposits from unburned gas, the problem could be either in the secondary ignition (plug, plug wire, coil), or an injection problem. Try a known good spark plug and spark plug wire, also a known good coil, if plug and wire wasn't it. If checking for spark, you need to see a blue snapping spark when cranking engine to verify good ignition. A weak or orange spark, or intermittent spark is an ignition problem.
To check injection circuit on number 5, you can purchase an inexpensive "noid light" at parts stores. It plugs into the injector connector, and if circuit is good the noid light will be blinking when cranking the engine over. It is rare for injectors to fail, but if circuit is good and no gas is getting into the cylinder, injector may be bad or plugged.
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P0300 and P0303 misfire codes 2004 Isuzu Rodeo 3.5L


so missfire detected and cylinder 3 missfire detected.
check to see injector pulse with "noide light" if ok injector is problem
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Missfiring on one cylinder


do you know the firing order? if not check it and re configure the plug wires to that order

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Missfire # 5 cyl before and after plugs and wires ?I changed some vacume hoses still same what to ck nexed


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I have a missfire code on the check engine light. 1997 honda prel


Find out which cylinder is missfiring by using an inductive timing light to check each plug wire for spark. If you find a dead wire you should replace the all the wires and spark plugs. If you don't find a dead wire check the distributor cap. You could have a broken contact or a crack which might cause a loss of spark at one cylinder.

Honda wires are much better than their aftermarket counterparts so don't skimp there.

I hope this helps. Good luck and be careful!

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