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98 p 38 won't rev above 2000 rpm

5848 Views 5 Replies 4 Participants Last post by  Rock

I'm looking at purchasing another p38 after selling my modded 98. What I know (sight unseen) pretty clean 98 4.0 114k miles. Owner says it starts right up and stays running but doesn't hold fuel pressure? and truck will not rev above 2000 rpm. I'm thinking tps or crank sensor? Maybee fuel pump, pressure reg or vacumm line? Any other thoughts ? If the price is right i Might roll the dice? anything major someone can think of? My last 98 rode like a dream and I talked to a p38 owner tonight so of course I'm jonesing for another rr.



Ps the owner has taken it to the local goodyear? store for a fix they think fuel pump but I suspect mechanics haven't worked on a rr before
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Im not sure about the throttle cable, but if it has a check engine light, scan it and it will tell you if it is cats or what. sounds like TPS or crank sensor

I had a similar problem with mine, no engine light. The reluctor teeth on the fly wheel-the things the crank sensor senses- were my problem. One was bent, and another missing. You can remove an access plate on the lower portion of the bellhousing to check. Just be very careful, as I did this and didnt see anything. its a difficult angle.
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