Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help

Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Tech Help

LinkBack Thread Tools Display Modes
Old 08-01-2000, 04:46 PM
dlt dlt is offline
Registered User
Join Date: Jun 2000
Posts: 23
I just replaced the sparklugs and it seems that the car does not iddle smoothly as before. I stay around 800rmp for 10 sec then drops to 500rmp for 2-3 sec then back to 800rpm again. As the rpm drops the 2 fans in front of the radiator go On but go off then the rev. climbs. My question is, can the new plugs cause this irratic iddle? Or something else? BTW I used copper core plugs made by NGK. Any suggestion is greatly appreciated.

'92 190E 2.6 103K
Reply With Quote
Old 08-01-2000, 10:08 PM
Registered User
Join Date: Jan 2000
Location: New Bedford, MA USA
Posts: 1,583
Not sure on that model, but it does sound like some of the weirdness the OVP relay can cause.

Jeff Lawrence
1987 300e
1989 300e
2000 Dodge Grand Caravan SE
Reply With Quote
Old 08-02-2000, 09:53 PM
dlt dlt is offline
Registered User
Join Date: Jun 2000
Posts: 23
Hi again,

How do I check for this OVR? Is this procedure involed or can it be easily repaired/replaced? I read somewhere in the past that jumping starting can damage the OVR. The last time the car was jump started was 1 yr ago, but I just noticed this erratic iddle right after I replaced the plugs.

Reply With Quote
Old 08-02-2000, 10:57 PM
Alain V.'s Avatar
Senior Member
Join Date: Aug 1999
Location: KS.
Posts: 459
If it ran fine until you replaced the plugs, that would be the first thing to "double check"
1-are you certain all the wires are on the correct plugs?

2-Did you take care to remove the plug wires by (using special plug wire pliers) or pulling the connector itself, and NOT by pulling on the wire?

3-did you set the gap or check the gap before installing them?

4-did you drop any of the plugs before installing them?

Please don't be insulted by my questions. It isn't that I think you don't know how to change a few plugs. I'm just trying to make sure you didn't accidentally create a (miss or) problem without realizing it.

Reply With Quote
Old 08-02-2000, 11:23 PM
Registered User
Join Date: Mar 1999
Location: Suwanee, GA, USA
Posts: 4,712
Be sure that you used the right plugs. Only copper core plugs will do, no plats.
Reply With Quote
Old 08-03-2000, 09:57 PM
dlt dlt is offline
Registered User
Join Date: Jun 2000
Posts: 23

I did use copper plugs, checked the gap, but did not use a special tool to remove the wires. I changed one plug at a time so pretty certain that did not mix them up. I rechecked the wires making sure that they're tight and this probably was the culprit. For the last 2 days the car iddle fine at a steady 750rpm. I'm still confused as to why the fans come On and Off? Thanks for everyone comments as always.

Reply With Quote
Old 08-04-2000, 02:48 PM
Posts: n/a
Had a less severe problem with my idle, and other misc. weirdness. Got a new OVP for another problem and it smoothed the idle out. What that has to do with new plugs, I think that the guy that sold you the plugs didnt like the way you smiled at the counter lady he is working on getting so he went to the back and got part number 545 548 54 96KM.
the KM stands for "kill mercedes" this special plug sends an electrical gremlin through the plug wires all the way to the OVP and disables 1 small function of the relay thus your problem. Check your box for the KM. Well thats just one thought.
Reply With Quote
Old 08-05-2000, 10:17 PM
Posts: n/a
First things first. if the car was running good before the plug change, check your work again, also the replcement plug for that car or a 103 engine is a bosch H9DCO spark plug.
Reply With Quote
Old 08-06-2000, 12:22 PM
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
Coming in late to this one, but I find the fans to be the key in this diagnosis.

It sounds to me that you have bumped the coolant temp sensor, which is now making poor contact. This could affect the mixture and the fans. Just a guess.

Steve Brotherton
Owner 24 bay BSC
Bosch Master, ASE master L1
26 years MB technician
Reply With Quote
Old 08-07-2000, 12:07 AM
dlt dlt is offline
Registered User
Join Date: Jun 2000
Posts: 23
To all,

Was hot in Chicago today and the car ran fine. Aux fan seemed normal, iddle normal etc.... I will check the temp. sensor for any faulty connection. Thanks

'92 190E Sportline
Reply With Quote


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
Reasonable Price for a 93 190E 2.6 w/ 90K miles Chiragp Mercedes-Benz Used Parts For Sale & Wanted 8 01-28-2005 10:45 PM
Flywheels... 300E-24 Vs 190E 2.6 sportline... Bigg_P Mercedes-Benz Performance Paddock 1 01-28-2003 10:21 PM
3.0 into 190E 2.6 neileg Mercedes-Benz Performance Paddock 10 11-22-2002 06:54 AM
3.0 into 190E 2.6 neileg Tech Help 2 11-01-2002 12:30 PM
Reasonable Price for a 93 190E 2.6 w/ 90K miles Chiragp Mercedes-Benz Performance Paddock 3 04-23-2000 12:11 AM

All times are GMT -4. The time now is 04:19 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page