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 > Car Audio and Multimedia

LinkBack Thread Tools Display Modes
Old 01-25-2003, 11:20 AM
Registered User
Join Date: Jul 2002
Location: New York, USA
Posts: 3
Poor Idle 1988 300E & Radio Reception Poor

Had poor idle on my 1988 300 E with 100,700 mi. Took it to shop for $1,400 repairs. While 60% better, still idles rough in neutral. The work they did:

New plugs, rotor, distributor cap, replaced intake manifold gasket, replaced all hoses for idle air system, replaced air sensor plate belows, replaced fuel injectors and seals, performed engine decarb.

Most of the improvement came with the new plugs and dist. cap and rotor. Is it unreasonable to expect the car to idle smoothly?
Any recommendations?

Also, anything that can be done to improve ignition static and reception on stock MB radio?

Bill W
Reply With Quote
Old 01-25-2003, 04:10 PM
Super Moderator
Join Date: Apr 2000
Location: Falls Church, VA
Posts: 5,316
On the radio, I would check that the antenna has good contact with the body where it mounts.

The car should idle well, espcially with all the work you had done.

The remaining suspects are the mixture, the fuel distributor, the EHA , the O2 sensor, and the lambda control in closed loop.

There are a lot of posts on this subject and a really good one is "My last EHA question" by Cap'n Courageous.
Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe
Reply With Quote
Old 01-25-2003, 04:38 PM
Registered User
Join Date: Dec 2001
Posts: 572
Did the radio static begin after this recent work? If so, I'd ask about the type of spark plug(s) used. Some types of plugs are known to cause this problem.

Check out this URL and look further down into it for Radio Frequency Interference:
Reply With Quote
Old 01-25-2003, 06:58 PM
Registered User
Join Date: Aug 2001
Location: Evansville, Indiana
Posts: 8,150
Ignition static is almost always lack of proper resistance in the ignition wiring and plugs -- one reason to stick with OEM plug wires.

Engine vibration at idle after a good tune up is almost certainly out of range idle mixture, a bad OVP relay, or a bad EHA. If it leaks, it's shot on the latter.

Also, check the engine mounts -- they are a spring mount, enclosed in rubber with a limited area annular orifice, and filled with glycol. When the rubber wears out and the glycol leaks out, the spring is free to allow the engine to vibrate, and it does, quite a bit!

You can tell by looking if they are shot -- there is a tapered steel insert on the bottom of the mount. If you cannot see this tapered portion because it has collapsed into the mount, it's shot. Ditto if you can see the oily glycol on the mount or frame.

1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
Reply With Quote
Old 01-26-2003, 10:40 AM
Registered User
Join Date: Apr 2001
Location: Joliet Illinois
Posts: 309
Peter, good response on the engine vibration issue. My '92 300e has a vibration when in Park. The engine runs very smooth... no engine miss, but a vibration can be felt in the car. I suspect either bad exhaust hangers or motor mounts and now I know what to look for.

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 Off
Trackbacks are On
Pingbacks are On
Refbacks are On

All times are GMT -4. The time now is 08:45 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, 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