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tinkerbob 03-24-2012 07:51 PM

I have a 94 wrangler 4.0L 5pd man trans mpi
I have a miss i can not shake.
I just bought it from a guy who bought it from a guy.
All the changes made are distributor, dist cap & rotor, plugs and wires, water temp sensor, air intake sensor, mat sens, map sens, fuel pressure reg, throttle position sensor, i unhooked the oxy sensor and no change, fuel pump chged, fuel filter,
When cold 25 degrees or so it would backfire (exhaust) and miss when warmed up.
Now that it is warmer it misses, today missed about 10 - 12 times in 3.5 miles. Will miss as i go thru the gears and as cruising.
It does idle a little ruff too, but not real bad.+
Tomorrow i check the crank pos sens with ohm meter.
If that is ok i check injectors with ohm meter
If all good i will be looking for a new Eng control module.
Any other ideas?

Master4th 03-24-2012 07:56 PM

Start the engine and unplug each Fuel Injector. If you unplug one and it has no effect its bad.

Nubby55 03-24-2012 10:09 PM

Compression check time after that, or before.

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