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Old 10-23-2010, 02:51 PM
Registered User
Join Date: Mar 2005
Posts: 335
Sorry if this was mentioned in your earlier thread. I didn't read the entire post.

I think that you may have an intake manifold gasket problem. Take some starting fluid and spray it around the entire manifold gasket. Your model probably has one gasket on each side. While you do this try to determine if the idle changes. If it does, then you have a gasket failure in the area that you were spraying the starting fluid.

Cross your fingers! You can also check if the intake manifold bolts are loose. If they are you most likely will have to remove the intake manifold to clean both surfaces and replace gasket since this problem has been ongoing for so long.

1998 E320 150,000
1980 300SD 240,000
1965 190D 79,000
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Old 01-17-2011, 05:56 PM
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Join Date: Jan 2011
Posts: 2
OVP relay..?

The overload voltage protection relay often fixes the abs light and uneven engine behavior.

I have replaced it on my 500e m119, and got rid of a problem with abs light, cruice control misbehaving and occational limp mode hickups. Now it runs fine, but am having a new problem (probably not related to my writing above). When idling the revs go uncontrollably up and down. This also happens in N. When in drive or reverse there is no issues. Please help..!
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Old 01-18-2011, 01:16 AM
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Join Date: May 2007
Location: Arizona
Posts: 760
Welcome to the forum. I didn't think the 500E had an OVP. Presuming that the 500E and E420 use the same LH Jetronic system, can you tell me where the OVP is located on your 500E. Thanks.
1993 400E, 256,000 miles (totaled)
1994 E420, 200,000+ miles
1995 E420, 201,000 miles
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Old 01-22-2011, 12:39 AM
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Join Date: Jan 2010
Location: U.S.A
Posts: 347
you may be on to something there with an air manifold leak,it will act as a vacum leak causing and eratic idle,there is also an idle control valve it commonly gets old and cacked full of carbon,its located in the front of the fuel distributor,its a big round aluminum item the has 2 black tubes coming from it,pull it out and make sure its not all gummed up with carbon,this will sieze the valve inside that moves,if so then get carb cleaner spray it inside the valve let it sit,keeep doing this and trying to clean it out,you can inspect the valve while its out just have some one turn the key you wil see the valve open then close,you will then know if its working fine.if its siezed then get a new or used one thats fairly clean.goodluck
enjoy life,take the coal that is handed to you and turn it into diamonds. { PHILLIPIANS 4:13}
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Old 01-24-2011, 06:54 AM
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Join Date: Jan 2011
Posts: 2
Originally Posted by emerydc8 View Post
Welcome to the forum. I didn't think the 500E had an OVP. Presuming that the 500E and E420 use the same LH Jetronic system, can you tell me where the OVP is located on your 500E. Thanks.
Yes, you are absolutely correct.

I will ask him what exact part he replaced. I'm only passing the information.
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Old 02-11-2011, 02:16 AM
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W124 Passion for E420
Join Date: May 2005
Location: Sunshine State
Posts: 225

I have been down this road before, sounds like EZL failure.

Read my post:

1994 MB E420 issues idle/surging/stalling LONG

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