After much trouble shooting and parts replacement my problem ended up being a loose retaining bolt on the crank sensor. The bolt did not have a lock washer on it, I put in a 1/8" longer bolt ans added the lock washer and have not had any problems since.

 

Hi Bob - glad to hear that you got your issue resolved. I'm attaching a link below to our site's DIY tech articles on the R129 platform. Each article includes a step-by-step guide. I hope you find this helpful when doing any maintenance or repairs in the future. Please let us know if you have any questions!

Mercedes-Benz SL-Class R129 (1990-2002) Technical Articles

 

I think my friend had similar problem. I will try to ask him what helped him, cheers

 

Hi, I had the same problem with my 94 SL500. Problem ended up being bad fuel injectors.
Good Luck,
Bob

 

I think u can also check the crankshaft sensor it might be an intermittent fault which plays hide and seek with u.


Emmanuel
Ghana.

 

I agree, a friend of mine that works at DSRLeasing used to have the very same problem, although it was long, long time ago. It turned out to be fuel injectors as well.

 

Hi,
I had a similar problem with my 1994 SL500. I replaced the crank sensor and I thought it fixed the problem but it came back. Ended up being bad fuel injectors. I installed a rebuilt set in the car and have had no problems since.
Good Luck,
Bob