SL-Class (R129) 1990-2002: SL 280, SL 300, SL 320, SL 500, SL 600, SL 60 AMG

SL/R129: SL280 starts but won't rev above idle.

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Old 05-26-2012, 08:53 AM
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citroen c5, C250TD
Unhappy SL280 starts but won't rev above idle.

Hello everybody,
Please could somebody assist with fault diagnosis on the sl280. year 2000 model.
Firstly this car had a intermitent throtle responce fault which occured after a long run resulting in no or delayed responce when pushing the gas pedal. This usualy cleared itself on restarting the engine and everything was fine for a while.
So we plugged it into diagnostics which threw up a P1542 code, PPS, so ordered and fitted new pedal position sensor and cleared faults but car runs worse than ever , but shows no codes or engine check light. I have checked fuel filter and all seems ok, the throtle body seems to be responding to pedal movement so I think thats ok.
Car starts fine but will show little or no responce to throtle pedal so can't be driven. I am on the point of putting into MB dealers so any comments would be apreciated. THanks.
Old 06-01-2012, 03:40 AM
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citroen c5, C250TD
SL280 now running perfect.

Problem now fixed!

For future reference , all symptoms down to faulty MAF, new one fitted and all is well.

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