Originally Posted by 86cj74.2L
The PCM knows the ignition timing event. At that time it watch for the crank to accelerate. If it doesn't it codes for a misfire on that cylinder. Now in saying that if it fires and there is weak acceleration on the crank it would know that too but there is no code for that condition and I don't know what the minimum crankshaft acceleration would be to cause a code. Per-say.......
If you've done a tune up with plugs fuel filter bla bla bla all that's left is dirty injectors, weak coil, or a compression test.
A truly bad miss would ares your hydrocarbons if you have a sniffer.
What are the LTFT's for bank 1&2
It only seems to have a slight miss at idle and I can feel it through the steering wheel. When accelerating it doesn't seem to miss at all and has plenty of power. Of course I've had all 4.0's for 18 years and the V8/4.7 is something else!
Changing the fuel filter is something I'm planning on doing soon. Was going to buy a WIX but saw a review where it raised a WJ's fuel pressure too much so might as well go with Mopar.
The muffler's leaking some from the rusted seam where I brazed it and need to put the new muffler with resonator on I bought from Kolak.
As mentioned before do you know exactly where I'd put the probes on my ohm meter for checking primary and secondary resistance on the coil packs? And will this tell me if the coil pack is weak since really don't want to replace them all? I'm not at all familiar with this test and would assume you need to have the neg battery cable disconnected?
I don't have a sniffer but when my wife gets home from work I'll try to put my scanner/reader on it for the bank 1/2 LTFT's. Thanks for your help!