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Old March 23rd, 2016, 09:39
SBpunk SBpunk is offline
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Join Date: Jan 2013
Location: Enid, OK
Posts: 339
4.0 Issues on idle/power

1992 w/ 4.0 AX15 231

So having a rough idle and a few other things I'll list below. Worried the issue might be more than I can deal with in the garage. Hoping its just a fuel injector or spark plugs so going to be changing them out.

Rough Idle
Oil w/ Gas smell
Sometimes hard start (have to hit the gas pedal)
Backfire through intake (this one scares me a bit)
Lack of power (gearing and tires suck but still lacking)

Things I'm hoping would solve it is replacing the tail pipe after the muffler since theres some holes from rust. Testing out the fuel injectors to see if one is leaking/not working at all. Changing spark plugs because I'm pretty sure the PO said he put the 4 point ones in. Other than messing with the rotor, cap, wires and other general tune up stuff I'm concerned the problem might be in the pistons or valves.
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