miss fire
#1
miss fire
I have a ram conversion 1996 3.9 2500, when on the last few miles of a 1500 mile drive engine dropped to 5 cylinders. have all new plugs and leads 3000 miles ago. Isolated which cylinder was not firing so replace lead and plug again, no luck, so changed cap and rotor no luck, power is arriving at plug. have just done comp test and cylinder is the same as others just under 150. Not sure what comp should be but as it is the same as working cylinders i assum its not that. whats next any ideas.
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#9
You checked the compression, so the valves and rings are good.
It is a TBI, so that eliminates a single injector as the source of misfire on just 1 cylinder
You have replaced cap, rotor, and wires, and it still misfires on a particular cylinder.
The only thing left is the plug which I don't see that you have replaced.
The cheaper caps have aluminum contacts and wear out much quicker. Pay a little more for the copper/ brass contacts.
Your 1996 did not come with a TBI, your engine is from an earlier Vehicle.
It is a TBI, so that eliminates a single injector as the source of misfire on just 1 cylinder
You have replaced cap, rotor, and wires, and it still misfires on a particular cylinder.
The only thing left is the plug which I don't see that you have replaced.
The cheaper caps have aluminum contacts and wear out much quicker. Pay a little more for the copper/ brass contacts.
Your 1996 did not come with a TBI, your engine is from an earlier Vehicle.
#10
miss fire
sorry forgot to mention i first changed plug with another cylinder and it worked but missfire cylnder still no joy so put new plug just in case ,still nothing. Also interesting fact you mention is it has an earlier engine, when i bought it it had 50,000 miles and have had 110,000 miles almost trouble free motoring , till now
Last edited by abouttime; 06-15-2010 at 06:56 PM.