Parts Catalog Accessories Catalog Tech Info Tech Forums
  Search our site:    
 Cart  | Project List | Order Status | Help    

Go Back   PeachParts Mercedes ShopForum > Technical Information and Support > Tech Help

LinkBack Thread Tools Display Modes
Old 03-19-2001, 04:48 PM
sixto's Avatar
smoke gets in your eyes
Join Date: Jun 2000
Location: SF Bay Area
Posts: 18,745
I've been told by the dealer that there is evidence of rust in the fuel distributor of my 91 300SE. I don't have technical expertise in this area, but my gut feel is that this engine would not be turbine smooth accelerating through red line if rust was a real problem.

In that light, what are the symptoms of a failing/failed frequency valve, overvoltage protection relay and oxygen sensor? Should I expect a noticeable change the idle or ability to idle if I disconnect these components one at a time? Again, it's velvet above 1,000 rpm.

Is there a limit on how many ways I can pester the forum with this problem?

78 450SEL ... could be gone tonight
91 300SE
Reply With Quote
Old 03-19-2001, 05:51 PM
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
Rust is not so nice to K/KE jetronic fuel systems. Check inside the filler neck of the gas tank. Usually rust appears in that area if at all.

The 103 motors all use KE jetronic. They do not have frequency valves. The OVP relay powers the engine controller (and ABS). With it dead numerous symptoms can occur, such as: hard cold starting, hesitations, fluctuating idle, low idle etc.

The O2 sensor also can cause numerous problems and if its more than 60k since replacement it might be a good part to change without testing. Proper testing is the answer for all these things.
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
Reply With Quote
Old 03-19-2001, 06:23 PM
sixto's Avatar
smoke gets in your eyes
Join Date: Jun 2000
Location: SF Bay Area
Posts: 18,745
When I said frequency valve, I meant that idle control device that looks like a stepper motor actualted valve. I know that proper testing is the key, but is there a quick check for that idle control device?

Reply With Quote
Old 03-20-2001, 12:40 AM
Registered User
Join Date: Apr 2000
Posts: 412
Sixto, a question like yours is no bother. In fact it is very interesting and all 103 owners will store your problem in their bank of knowledge on what to do if this problem ever comes up. Keep us posted on what happens, in detail.
1990 190E 2.6
1996 Grand Voyager 3.3
1985 Mustang GT 5.0 5 SPD
1982 Suzuki GS 750T
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

Similar Threads
Thread Thread Starter Forum Replies Last Post
560sl rough idle sms Tech Help 2 10-21-2003 11:58 PM
Could This Be the Root Cause of Rough Idle? EricSilver Tech Help 14 10-16-2003 07:51 PM
74 450SLC rough idle solved! deaconblues Tech Help 3 09-15-2003 12:23 AM
400E rough idle problem finally solved carman850 Tech Help 1 04-19-2002 07:38 PM

All times are GMT -4. The time now is 05:27 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2016, 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