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 07-14-2007, 11:52 PM
Registered User
Join Date: Jul 2007
Posts: 1
98 C230 Transmission kickback & engine rattle

I have two problems with my 1998 C230 sedan with 55K miles on it. Problem 1 - Recently the car has been giving a hard lurch (as if someone rear-ends the vehicle) everytime I come to a quick stop. It's as if the transmission is slamming when downshifting to it's last gear before stopping. The problem is less obvious if I brake slowly and come to a slow rolling stop.

Problem 2 - My "engine valves" rattles very heavily when the car reaches normally operating temperature or after the car has been idling for a long period. The rattling is especially pronounced if I leave the automatic transmission in "W" mode whilst driving. The rattling is coming from the left front underhood area. Surprisingly the noise only occurs when the car is actually driving and I'm accelerating putting a load on the engine. If I keep the car in neutral/park and rev the engine there is very little rattling. Or if I accelerate slowing the rattling isn't as heavy.

So far I've taken the car to two separate shops and they've changed spark plugs (twice); replaced air mass meter (twice); replaced front oxygen sensor; changed transmission fluid (twice; temporarily fixing the transmission lurching problem for about a month); removed and serviced the cooling fan, and did several unscheduled oil change replacing the engine oil with castrol full synthetic 10W 30W.

Does anyone have any suggestion on sorting these problems? Is the transmission lurching and valve rattling problem related or are they separate issue. At this point I'm clueless and I think my mechanics are also.
Reply With Quote
Old 07-15-2007, 12:40 AM
Registered User
Join Date: Sep 2004
Location: Seattle
Posts: 1,912

I am guessing you have 2 seperate problems. Those trans can be finnicky, I have been lucky so far. You can search on "C230 transmission" and probably find quite a bit of info. As for your rattle problem, I had a very similar problem and no one else really did. It sounded to me like knocking and occurred under load as you say, which would be typical of knocking. However, no matter what gas I used it made no difference, whether regular or super duper. I had both a "primary" rattle and also a "parasitic" rattle in the cat which had a loose element on one side. You can test for that by tapping on the cats lightly with a rubber mallet.

I even tested the knock sensor which was fine. I called the dealer and they said I should run REGULAR gas in it. Yeah that's what they said. God only knows why that should make it rattle less!! Anyway one day (after a couple of years) I noticed that I didn't seem to hear it. So sadly I cannot tell you how I "fixed" it. However, changing the cat did make it a lot quieter.

1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra
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 07:18 PM.

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