Surging, No Power Warmed Up (Closed Loop)

For all non stroker / performance related problems and discussion.
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SilverXJ
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Posts: 5789
Joined: February 14th, 2008, 7:14 am
Stroker Displacement: 4.6L
Vehicle Year: 2000
Vehicle Make: Jeep
Vehicle Model: Cherokee
Location: Radford, Va

Re: Surging, No Power Warmed Up (Closed Loop)

Post by SilverXJ »

Your fuel pressure is a bit high, but still in spec, 49psi +/- 5psi.

Check the TPS.

If you are using the stock injectors for the 98 pcm you are using you need to use the stock fuel pressure (49psi +/- 5psi.), not 39 psi.

Are you using the stock 98 injectors? What is their history? Have they sat for any length of time? Junk yard finds?
Neuner
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Posts: 31
Joined: January 16th, 2015, 11:20 am
Vehicle Year: 1985
Vehicle Make: Jeep
Vehicle Model: CJ7

Re: Surging, No Power Warmed Up (Closed Loop)

Post by Neuner »

Returned the Bosch O2 Sensor and ordered a NGK OEM Sensor. Solved the problem. Been running great. Slight ping at load went away and not running rich.
Things you own, begin owning you.
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