Question about 1999 Chevrolet C1500

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What can cause random misfire? - 1999 Chevrolet C1500

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  • poppycasey Sep 23, 2008

    truck bogs and then back fires there does not seem to be any reason. I have done most tune up items

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Maf is bad

Posted on Nov 15, 2008

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Bad wires, bad plugs, bad ignition module, water, poor contact with anything in the ignition system, an intake leak, water in the fuel ect its a very long list

Posted on Sep 26, 2008

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I took my 2001 civic to the mechanic to clean my egr ports because of the random misfire when he pulled the intake manifold there was oil in there can is this the problem caused by the rndm misfire


It could cause a random misfire but I can't imagine it's from the random misfire, the only way oil can get into the intake is from the pcv system, most likely the pcv valve. A little oil coating is normal but excessive amounts are usually due to the valve being stuck open

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The plugs and crank sensor could have done it, but the TPS and idle air control would have nothing to do with a random miss.
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What causes an engine misfire?


It depends on whether it is a random or localized misfire. A trouble code P0300 or a combination of several P030x codes is considered random. These are caused by ignition systemic issues, such as loose or bad crank sensor, ignition module, deterioriated ignition wires, coil or rotor, etc. Somethimes they are also caused by fuel/air issues, such as dirty throttle body or clogged EGR system/failed EGT valve.

Localized misfires are on a single cylinder, for example, P0302 would be cylinder 2 misfire. This would be caused by a bad plug, wire, or possibly a burned valve or blown head gasket.

Am I answering your question OK? If not, please feel free to ask more questions.

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Frequent overheating is caused by low fluid level for coolant, coolant fan not working, or stuck closed thermostat.

The random misfire could be caused by a bad sensor like an O2 sensor, for example.

Wish you luck on this repair.

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Do you feel a misfire?? Random misfires are usually caused by a lean fuel mixture, the reasons that cause this a to many to list here.

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