P38A DSE won't rev

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Downunder11

New Member
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5
Location
New Zealand
My 2.5 DSE 1996 will start okay and idle OK. It will rev until redline when stationary. As soon as it goes into drive it won't rev past 1,000rpm 90% of the time. Occasionally it will drive normally, but not often. Specialist says no fault codes are coming up on Nanocom however is suggesting either faulty potentiometer or Map sensor. Does anyone have any ideas??
 
Have you tried different diagnostics and the following handy book
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Addit: @Saint.V8 , @Grrrrrr , @Henry_b and the other P38 owners, is the potentiometer the same as the TPS*? Or is the idle control thingy?

*Nooooo, not tyre pressure sensor :p
 
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Think they mean the throttle position sensor but if that was shot then I don't think it would rev at all.

MAP is worth checking. The pipe runs from fuel filter to under the inlet manifold. Need to make sure the inlet manifold end is clear and pipe is good. Diagnostics should show change in pressure as turbo spools up.
 
My 2.5 DSE 1996 will start okay and idle OK. It will rev until redline when stationary. As soon as it goes into drive it won't rev past 1,000rpm 90% of the time. Occasionally it will drive normally, but not often. Specialist says no fault codes are coming up on Nanocom however is suggesting either faulty potentiometer or Map sensor. Does anyone have any ideas??
Faulty potentiometer? More details needed, do you mean the fuel quantity servo potentiometer?
 
Nanocom can record a trace of what is going on. Then you can zip the CSV file and upload it here. One of the gurus might spot something. Think there are 2 or maybe 3 sections in the EDC module.
 
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