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Marty, Mercedes Technician
Category: Mercedes
Satisfied Customers: 53904
Experience:  Bosch Certified Master Tech. Over 35 years experience.
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1992 r 129 SL 500. Car studders hard and almost shuts off

Customer Question

1992 r 129 SL 500. Car studders hard and almost shuts off after rain, damp morning or wash. Distributor cap and rotor just changed for $600.00
Submitted: 10 months ago.
Category: Mercedes
Expert:  Marty replied 10 months ago.

Hi, my name is***** the car only acts up in wet or damp weather I would suspect the ignition wires and ignition coils. Also, there are ceramic noise suppressors underneath each ignition rotor inside the distributors. They can sweat moisture and cause this problem. If the ceramic noise suppressors were not replaced I would suggest doing so.

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Expert:  Marty replied 10 months ago.

Just checking in. Do you need anymore help with this? Was the information helpful?

Customer: replied 10 months ago.
Noise suppresors were changed less than a year ago along with rotor and caps. New caps and rotors put on last week .This car studders so hard you can here the belt slip . After a while it general clears up . Most times if I pull over and restart the car it runs better.Could there be something getting a bad signal from the water telling it to go into limp mode spontaneously ? Off and on like a light switch.
Customer: replied 10 months ago.
Mechanic said coil and wires were good! I will have him check again.