Posted on Jul 09, 2009

Have no power on acceleration, backfires 4.0L Jeep

I have replaced air & fuel filter also plugs, dist. cap, rotor button, wires &plugs. TPS sensor checks ok, coil also checks ok. I have checke all vaccume lines. I recently replaced EGR valve and gasket ( a different problem ) about 3 months ago CPS censor was replaced ( could it be bad or dirty? ) I don't know what else to check. Could someone PLEASE HELP!!!!

2 more comments
maroke89 Jul 10, 2009

It is hard to start, it seems flooded. Once it starts and idles for a little while you can rev up the engine. When you try and drive it has no acceleration and stutters and backfires. If you floor it and can get the RPM's to @ 3000 it has some power but not 100%. It will run fairly well if you can get it to 55 MPH and cut off overdrive to hold RPM's up. It did briefly run ok when I was trying to get it home but when I had to stop it started all over again when I tried to get going again. How do you check converter
Marvin May 11, 2010

what trouble codes in memory? what trouble codes in memory?
Marvin May 11, 2010

what is the fuel pressure PSI? what is the fuel pressure PSI?
Mike Butler May 11, 2010

Have you checked for plugged exhaust, as in catalytic converter?

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Anonymous

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Posted on Aug 03, 2009

Anonymous

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Joined: Feb 20, 2008

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Could it be your throttle sensor? If it is a carbureted engine, check the accelerator pump inside the carb.

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