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

SL/R129: 1991 SL500 R129 Low Rough Idle and Dies on Acceleration

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Old 09-01-2024, 04:16 PM
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1991 SL500
1991 SL500 R129 Low Rough Idle and Dies on Acceleration

Just picked up this California clean car that doesn't roll. It starts with super low idle. If I try to step on gas peddle it dies. If I manually press down on air flow meter it idles fine. If I manually throttle and press down on air flow meter it revs fine. When cold I need to initially give it a lil bit starting fluid. If keep spraying it idles higher. I don't know if it's electrical

I checked following:
  • checked fuel presser at prime and run at fuel distributor.
  • vacuum leaks
  • cam sensor
  • cleaned and checked OVP valve.
  • OVP relay fuse
  • all other fuses
I would like to see if the MB community can point me in right direction to narrow down.
Old Yesterday, 08:22 AM
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Have you checked the fuel filter?
Old Today, 11:29 AM
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190E 2.6L 1989, 190E 2.6L 1988, BMW 535dXdrive 2014, BMW 428i 2015
Assuming this is the old KE-Jetronic fuel system have you checked the duty cycle at idle and at 2500 rpm.

Does it stall both when engine is cold and hot?
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Old Today, 11:31 AM
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'18 Mercedes GTR and 1999 SL500
Stalls when hot and cold

Originally Posted by dolucasi
Assuming this is the old KE-Jetronic fuel system have you checked the duty cycle at idle and at 2500 rpm.

Does it stall both when engine is cold and hot?
Yes it does .
Old Today, 03:00 PM
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1991 SL500
I will swap out and report back. I assumed the correct fuel pressure would cover this but I may be incorrect.

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