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

SL/R129: Difficult to start when engine is hot

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Old 04-03-2011, 03:50 AM
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SL500 (1995), 230E (1988)
Difficult to start when engine is hot

My SL500 seems to have difficulty starting when the engine is hot. Very easy to start when cold though. Anyone had similar issues?
Old 04-03-2011, 09:55 AM
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CL55, SL500, E350
If you need help, you should describe more details the symptoms. Also, the mileage and model year of your SL500 should also be helpful.

Without all those, my guess is either CPS or fuel pump/sensor.
Old 04-03-2011, 02:38 PM
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82 380SL 96 SL500
Originally Posted by rogerthat
My SL500 seems to have difficulty starting when the engine is hot. Very easy to start when cold though. Anyone had similar issues?

If '90-'92 a failing fuel accumulator would be a good guess.

If it's a newer model I'd guess a sensor, but damned if I know which one.

You did notice I said "guess"?

BTW, please add model year to your profile. It makes a BIG difference as there are major differences in models.

Last edited by abiby; 04-03-2011 at 02:41 PM.
Old 04-03-2011, 03:18 PM
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300E a couple 1994 w124wagon E320 Wagon/,1971MGB Track/Rally, MG Midget Autocross ,2000 E320 wagon.
Replace the

CPS crank position sensor. Takes all of 15 minutes
Old 04-06-2011, 12:15 PM
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SL500 (1995), 230E (1988)
The car is with the mechanic as we speak. He reckons the difficulty in starting when the engine is hot is due to two faulty fuel valves so the 2 fuel valves needs replacement as there was evidence of fuel leak in that area. I should be getting the car back in a day or two so I will update again.
Old 06-08-2011, 12:58 PM
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1992 500SL
Originally Posted by rogerthat
The car is with the mechanic as we speak. He reckons the difficulty in starting when the engine is hot is due to two faulty fuel valves so the 2 fuel valves needs replacement as there was evidence of fuel leak in that area. I should be getting the car back in a day or two so I will update again.
Hello !
any update to your fix ?
thx
jg.

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