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 ShopForum > Technical Information and Support > Tech Help

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 03-26-2002, 07:06 PM
Moderator
 
Join Date: Dec 2001
Location: Southern California, U.S.A.
Posts: 8,508
Replaced water pump, now idle is fluctuating...

I had the water pump replaced yesterday - it went out while I was on the freeway.

I have a 1993 300E, with the 3.2 liter M104 engine, 134,000 miles on the clock.

Had it replaced by my MB indie, and when I pick up the car, the idle is fluctuating up and down. It wasn't doing this when I brought it in. It does this at idle in any gear - park, drive, reverse.

The check engine light is not on.

I don't know if there is a connection between replacing a water pump, and a fluctuating idle. Is there anything they could have touched or disconnected that could have caused this?

It "feels" like a vacum problem, so we checked to make sure all of the vacum lines were connected. They are.

Is it the mass air sensor?
Is it the throttle actuator?

Wouldn't these trip the Check Engine Light?

Is it just an amazing coincidence that immediately upon changing the water pump, I get the failure of another component?

Heeeeeelp.
__________________
Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".

Last edited by suginami; 03-26-2002 at 08:13 PM.
Reply With Quote
  #2  
Old 03-26-2002, 10:02 PM
Registered User
 
Join Date: Mar 1999
Location: Suwanee, GA, USA
Posts: 4,712
There is a large black vacuum tube that could have been knocked off.
__________________
Benzmac:
Donnie Drummonds
ASE CERTIFIED MASTER AUTO TECHNICIAN
MERCEDES SPECIALIST 11 YRS
Reply With Quote
  #3  
Old 03-27-2002, 08:18 PM
Moderator
 
Join Date: Dec 2001
Location: Southern California, U.S.A.
Posts: 8,508
Well, the mechanic said he hooked it up to the scanner, and found codes for the air mass sensor and the coolant temperature sensor.

He explained that these two sensors communicate with each other and the DME, and that one or both could be out.

He replaced the coolant temperature sensor for free, said the problem didn't reoccur, so I picked it up and drove it home, when the idle immediately started fluctuating again. It fluctuates so much at idle with the transmission in drive, that I have to put it in neutral to stop the car from jerking. It's so embarrassing.

Called Edmond (the Irish-looking Syrian) back and he declared that it must be the air mass sensor. A frequent replacement item for all Mercedes- new and used - he said, and had a stack of 4 or 5 on his bench that he's replaced within a week.

Dealer wanted $447, fastlane charged me $255 delivered next day air - early morning delivery. Phil even kicked in $10.00 for the early morning delivery.

I love this site and the Fastlane parts shopping experience. I tried crying to Phill about my problems, but he wouldn't hear any of it - he's got a used Cadillac he bought recently that needs a new engine! Yikes!

We'll see if this works.
__________________
Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".
Reply With Quote
Reply

Bookmarks

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
380SL Fuel Pump Replacement Causes Rough Idle & Other Problems? ezrider SL Forum 8 03-14-2004 01:12 PM
Radiator blew up Scott98 Diesel Discussion 15 02-24-2004 08:57 PM
1986-190 E: Thermostat and water pump Greg Rivera Tech Help 2 11-07-2002 08:15 PM
aux. water pump & mono valve questions TheLaw Tech Help 1 08-23-2001 11:01 PM
190e 2.6 water pump replacement JDUB Tech Help 1 07-03-2001 10:56 PM



All times are GMT -4. The time now is 04:56 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2011 Pelican Parts - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page