92 SL500 runs rough after washing - Mercedes-Benz Forum
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post #1 of 13 (permalink) Old 05-25-2019, 06:03 AM Thread Starter
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92 SL500 runs rough after washing

After either going to the car wash or washing with the hose at home the car will run very rough with major hesitation for a couple of days, I assume until it drys out. Doesn't look like any water is making it to the engine as even when I washed it with a hose and was very careful not to spray too much water anywhere it still does it. Car has 110,000 km on it and was imported 8 years ago from Japan to Canada

Any ideas?
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post #2 of 13 (permalink) Old 05-25-2019, 06:26 AM
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Most likely culprit is the ignition, with condensation getting into some insulating area. To isolate, I would take a spray bottle and spray around the plugs, plug wires and ignition module. If it causes the hiccup, you can isolate better by just spraying particular areas.
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post #3 of 13 (permalink) Old 05-25-2019, 02:21 PM
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Your post is confusing. I assume you are not washing the engine bay with the hose?


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post #4 of 13 (permalink) Old 05-25-2019, 04:06 PM
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Your post is confusing. I assume you are not washing the engine bay with the hose?


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If he is then that can seriously affect the very sensitive electronics e.g. sensors etc.
A gentle hose is one thing but power washing the engine bay is sure to cause major damage

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post #5 of 13 (permalink) Old 05-25-2019, 05:24 PM
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I recall Albert (aam) had some advice how to keep moisture out of the distributor
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post #6 of 13 (permalink) Old 05-25-2019, 06:22 PM
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If he is then that can seriously affect the very sensitive electronics e.g. sensors etc.

A gentle hose is one thing but power washing the engine bay is sure to cause major damage


Iíd never wash my engine with a hose, the risk is far too high for my liking. Letís hope that isnít the case


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post #7 of 13 (permalink) Old 05-25-2019, 06:33 PM
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Have you freshened up the ignition since you got it? You know, cap, rotor, wires, plugs etc ??? If not it's probably due for it and then see how your car wash experiences go afterwards.
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post #8 of 13 (permalink) Old 05-25-2019, 07:05 PM
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Quote:
Originally Posted by RKH View Post
I recall Albert (aam) had some advice how to keep moisture out of the distributor
Hahaha,
You have amazing memory!
The distributor/ contraception post....

I think that in this case water hits the EZL.
By the space between the hood and fender.
(Left fender side.)
Look if you have over the EZL a plastic protection cover/panel.

After washing check if that area is wet.
And, Or,
Check the condition of the rubber seal on the double fire wall. Water may hit the fuses, etc.

Regards,
aam.
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post #9 of 13 (permalink) Old 05-26-2019, 03:59 AM
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Hahaha,
You have amazing memory!
The distributor/ contraception post....
We all remember your French tickler Albert! I read that post, guessing itís the same one, maybe around 10 years ago.
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post #10 of 13 (permalink) Old 05-28-2019, 08:59 AM Thread Starter
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This happens when washing the outside of the car, not the engine. Thanks for some of the tips, I will follow up on them
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