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 05-15-2007, 04:59 PM
michael l.kiser
Join Date: May 2006
Location: philadelphia pa
Posts: 8
Need a little help!

I have had a lot of work done to the engine of my 420. New head gaskets,water pump,fuel injectors and fuel filter with new hose. No more heavy oil consumption or slow take offs now. I have taken the car on one long trip to North Carolina (i live in philadelphia). The 420 ran very,very well and i was impressed to say the least.My problem is that i'm still haveing rough idleing at start ups and rough idleing while stoped at red lights. Should i buy better plugs and wires or check the air hoses. I'm just stump at this point. While on the road the car runs like a dream, it's just the rough idleing and sounds like it's missing, dose anybody have a clue? Please let me know!

Reply With Quote
Old 05-16-2007, 03:30 PM
BENZ-LGB's Avatar
Strong, silent type
Join Date: Apr 2001
Location: Southern California
Posts: 1,663
Michael, there are lots of reason for rough idle.

Could be a vacuum problem, or could be a problem wiht the injectors.

Do a search here under rough idle and I am sure that you will find many suggestions.

Good luck.

(I used to own a 1991 420SEL and I absolutely loved that car, especially out on the open road).
Current Benzes

1989 300TE "Alice"
1990 300CE "Sam Spade"
1991 300CE "Beowulf" RIP (06.1991 - 10.10.2007)
1998 E320 "Orson"
2002 C320 Wagon "Molly Fox"

Res non semper sunt quae esse videntur

My Gallery

Not in this weather!
Reply With Quote
Old 05-16-2007, 03:42 PM
zcc's Avatar
zcc zcc is offline
Registered User
Join Date: Nov 2005
Location: Kuwait
Posts: 610
It could be the engine mounts as well.
Master Computer Engineer, A+, Network+, MCP/MCSA/MCSE 4/2k/2k3 - Messaging, MCTS, MCITP, MCT, Brainbench, ICDL and starting Ph.D

380SE 1984 <------- Totaled by flipping accident
300SE 1988 <------- Sold
Volvo S70 2000 <---- 4 family
Opel Omega 2002 <-- 4 family
560SEC 1989 <------ Sold
560SEL 1990 <------ Sold
560SEL 1991 <------ 4 my mother
560SEL 1989 <------ Sold
600SEL 1992 <------ Current
Reply With Quote
Old 05-16-2007, 04:53 PM
Posts: n/a
what RPM does it idle at?

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

All times are GMT -4. The time now is 05:04 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2022, 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