1999 grand am 3400

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1 month 3 weeks ago #202551 by Huchters358
1999 grand am 3400 was created by Huchters358
I have a 1999 grand am that has a multiple miss fires I have changed coil packs and spark plugs just waiting on wires to come in and I can't figer out why it keeps miss firing also did upper and lower intake manifolds gaskets


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1 month 3 weeks ago #202553 by ToyotaKarl
Replied by ToyotaKarl on topic 1999 grand am 3400
If you have tried everything, it may be time for a compression test of all the cylinders to check the mechanical condition.

Also, Fuel delivery issues can cause misfires, be it bad/grounded fuel injectors, or a weak pump.

Good luck

-Karl

Just because it is legal, doesn't make it right....

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1 month 3 weeks ago #202554 by Huchters358
Replied by Huchters358 on topic 1999 grand am 3400
I forgot to say I did do a compression test on them all between 130 150 brand new fuel pump and filter 2months ago

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1 month 3 weeks ago - 1 month 3 weeks ago #202555 by ToyotaKarl
Replied by ToyotaKarl on topic 1999 grand am 3400
May want to try a noid light on those fuel injector connectors. See how well they are working...

Also, 130 is pretty low. I have seen engines that run that low, but I would rather see them 150+ at worst.

-Karl

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Last edit: 1 month 3 weeks ago by ToyotaKarl.

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1 week 3 days ago #202855 by Huchters358
Replied by Huchters358 on topic 1999 grand am 3400
so i have replaces the fuel pump fuel filter spark plugs coils wires and upper and lower intake and upper intake manifold gasket and all 6 fuel injectors still cant figer out what is going on just wondring if any of you guys would now what it be


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