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pattyboy 05-26-2012 05:06 PM

No power
My Jeep has no power with any amount of throttle, I have changed the tps, map, isc, changed the injectors, the o2 sensors. It does have about 39+-psi of fuel pressure. The computer was rebuilt some time ago.

What else should I check? Also what should long term fuel trim be at?

1998 4.0


03JGC4.7v8 05-26-2012 06:03 PM

Re: No power
Check the Catalytic converters, they will rob MASSIVE power if plugged up

pattyboy 05-26-2012 06:32 PM

Re: No power
thanks for the info ...i hope not its only about 6mos old....

2005JGC 05-27-2012 08:08 PM

Re: No power
I have seen new aftermarket cats fail very quickly, your long term fuel trim should be closer to 0, + number means its adding that much fuel above the baseline fuel map, a - number means its pulling fuel (so lean and rich respectively). A lean indication could be indication of a misfire which would explain a failed catalytic converter.

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