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  #1  
Old 04-28-2005, 10:35 AM
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Join Date: Apr 2005
Location: Manitoba, Canada
Posts: 23
Which one is it?

Tried to do this one without asking but........
Did all the 'noobe' searching that I could on the problem I am having (rough start up idle) and have narrowed it down to a possible faulty OVP. In my searches I found where the location of it is, but am uncertain which one it is. I took a picture and I assume it is either the chrome one, green one or white one. (1990 500SL)
Thanks for the help on this one.



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  #2  
Old 04-28-2005, 01:21 PM
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Join Date: May 2003
Location: DC Metro Area
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Doesn't a 1990 500SL have a M119 engine? If so - I think I remember reading that it doesn't have a dedicated OVP relay.

Please check to make sure before you replace. I could be wrong.

Troy
1995 E420 93k
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  #3  
Old 04-28-2005, 03:23 PM
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Location: Manitoba, Canada
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Well then I guess I'm back at square one on my cold start rough idle. Found this post which seems the same as what I am so I guess I'll start looking at a possible injector problem.
Idle Hesitation Problem Solved (I Hope)

Car runs/starts perfect after it warms up. Only happens for 30-60 seconds at first (cold) start.
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  #4  
Old 04-28-2005, 03:58 PM
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Location: Atlanta, GA
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Nope no OVP...that way when something goes wrong it takes your EZL w/ it..sharp engineering on MB's part w/ that one.. That aside, how many miles on your SL? These are known for harness issues as well as throttle slide's acting up w/ age.

Jonathan
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  #5  
Old 04-28-2005, 04:08 PM
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Location: Manitoba, Canada
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Just turned to 69,000 kms last week which is around 43,000 miles.
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  #6  
Old 05-04-2005, 06:20 PM
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Join Date: Apr 2005
Location: Manitoba, Canada
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Problem solved.
Went to the free mechanics clinic and ad the evaluation done on the car. They quickly diagnosed the multiple problems I was having. They stated this was all because the tow company that delivered my car boosted it.

Problems:
1. The ABS light was on.
2. The cold starting and rough idle problem.

Solution:
A $3 fuse that protects the Over Voltage realy (see pictures)

They replaced it at no charge and sent me on my way. Total cost of everything...... ZERO. Wow, am I ever pleased with this dealershipd service (Lone Star Mercedes in Winnipeg)

Here are a few pictures of where the relay and relay fuse are located in case someone else runs into the same problem.

Remove the 5 screws holding on the cover on the far left top engine area.



The over voltage relay is right in the middle with a clear plastic top



The plastic top pops up and the red fuse pulls strait out

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  #7  
Old 05-05-2005, 10:26 AM
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Please repost - your pictures didn't make it up.

Troy
1995 E420 93k

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