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

Reply
 
LinkBack Thread Tools Display Modes
  #16  
Old 05-23-2007, 12:52 PM
Pete Geither's Avatar
Half Fast Moderator
 
Join Date: Feb 2002
Location: Western Pa.
Posts: 2,417
Quote:
Originally Posted by Arthur Dalton View Post
OK

Also, when you check it, hold your finger over that vac line and make sure there is vac there when running.
The regulator had a diaphragm in it and what happens is the dia. leaks and then the gas get sucked into the engine through that vac line, causing your erratic rpm behavior..[ unmetered a/f mixture.] fairly common and easy diyer check/fix.
Good vaccum at the regulator Arthur and no gas whatsoever. No codes on the built in reader but code 13 appears on pin 8 with the code reader.

__________________
95 SL500 Smoke Silver, Parchment 64K
07 E350 4matic Station Wagon White 34K
02 E320 4Matic Silver/grey 80K
05 F150 Silver 44K
Reply With Quote
  #17  
Old 05-23-2007, 12:54 PM
Pete Geither's Avatar
Half Fast Moderator
 
Join Date: Feb 2002
Location: Western Pa.
Posts: 2,417
Quote:
Originally Posted by david s poole View Post
pete,been reading your thread and had the same prob with customer car several months ago.it wound up being a separate computer/relay on the floor in front of pass feet.i had assumed that main f.i. computer operated the idle but not the case.i went to salvage yard and found the part and fixed the problem.[this client had gone to expense of changing out the electronic accelerator with no effect]
Dave,,,, How did you determine that was the problem.
__________________
95 SL500 Smoke Silver, Parchment 64K
07 E350 4matic Station Wagon White 34K
02 E320 4Matic Silver/grey 80K
05 F150 Silver 44K
Reply With Quote
  #18  
Old 05-23-2007, 02:50 PM
Registered User
 
Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,804
< >

OK
One more quick thing I would like you to do..

After you get the code 13, I want you to clear it, run the engine after clearing and then turn it off.. Now, go back to same pin [8]and you should get a Single Flash [ code 1] . meaning code is clear..after the single code, wait 2 sec., hold button 6 secs , turn off key for 10 secs on for 50 secs and restart..That will reset the Memory and base line of the HFM module
Take the car for a couple of drives and see what happens..
I still suspect a vac leak [ mat be purge valve] , but do this first, as it a simple thing to do.
Reply With Quote
  #19  
Old 05-23-2007, 05:26 PM
david s poole
 
Join Date: Mar 2005
Location: dallas
Posts: 1,822
with my retriever scanner[mb dedicated] i determined that the e.a. had two or three codes that i couldn't erase and when i tried to access the isc it said error no communication.at that point i dug up the etm and traced the wiring back to idle speed computer.i pulled off plug,opened case and bingo burned smell.went and found another for 150 in salvage yard.[i was lucky enough to have similar car in shop and tried that unit first and it worked]
__________________
David S Poole
European Performance
Dallas, TX
4696880422

"Fortune favors the prepared mind"
1987 Mercedes Benz 420SEL
1988 Mercedes Benz 300TE (With new evaporator)
2000 Mercedes Benz C280
http://www.w108.org/gallery/albums/A...1159.thumb.jpg
Reply With Quote
  #20  
Old 05-23-2007, 08:21 PM
Pete Geither's Avatar
Half Fast Moderator
 
Join Date: Feb 2002
Location: Western Pa.
Posts: 2,417
Quote:
Originally Posted by david s poole View Post
with my retriever scanner[mb dedicated] i determined that the e.a. had two or three codes that i couldn't erase and when i tried to access the isc it said error no communication.at that point i dug up the etm and traced the wiring back to idle speed computer.i pulled off plug,opened case and bingo burned smell.went and found another for 150 in salvage yard.[i was lucky enough to have similar car in shop and tried that unit first and it worked]
Thank you David,,,, if Arthurs' solutions don't work I'll start sniffing around for a burnt module.
__________________
95 SL500 Smoke Silver, Parchment 64K
07 E350 4matic Station Wagon White 34K
02 E320 4Matic Silver/grey 80K
05 F150 Silver 44K
Reply With Quote
  #21  
Old 05-23-2007, 08:25 PM
Pete Geither's Avatar
Half Fast Moderator
 
Join Date: Feb 2002
Location: Western Pa.
Posts: 2,417
Quote:
Originally Posted by Arthur Dalton View Post
< >

OK
One more quick thing I would like you to do..

After you get the code 13, I want you to clear it, run the engine after clearing and then turn it off.. Now, go back to same pin [8]and you should get a Single Flash [ code 1] . meaning code is clear..after the single code, wait 2 sec., hold button 6 secs , turn off key for 10 secs on for 50 secs and restart..That will reset the Memory and base line of the HFM module
Take the car for a couple of drives and see what happens..
I still suspect a vac leak [ mat be purge valve] , but do this first, as it a simple thing to do.
Did the reset thing when I got home. been driving the SL in this nice weather, and after getting it up to temp, the surge has dissappeared. I am reserving judgement until I get it out tomorrow in hot weather. It never surges when cold and the hotter it gets the worse the surging gets. Thanks for all the help so far.
__________________
95 SL500 Smoke Silver, Parchment 64K
07 E350 4matic Station Wagon White 34K
02 E320 4Matic Silver/grey 80K
05 F150 Silver 44K
Reply With Quote
  #22  
Old 05-23-2007, 08:30 PM
Registered User
 
Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,804
OK

I doubt you have a ea module problem as mentioned b/c you have/had no communication codes stored...
Reply With Quote
  #23  
Old 05-24-2007, 12:11 PM
Pete Geither's Avatar
Half Fast Moderator
 
Join Date: Feb 2002
Location: Western Pa.
Posts: 2,417
OK Arthur,,, what in the heck did we do ? Have been driving the car in the heat today and so far,,, I'm knocking on wood here,,, NO surging or missing at all. Does this eliminate the vaccum leak, or has the engine recalibrated itself to compensate ? I mean this thing is running real smooth today. Thanks again.
__________________
95 SL500 Smoke Silver, Parchment 64K
07 E350 4matic Station Wagon White 34K
02 E320 4Matic Silver/grey 80K
05 F150 Silver 44K
Reply With Quote
  #24  
Old 05-24-2007, 12:25 PM
Registered User
 
Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,804
Quote:
Originally Posted by Pete Geither View Post
OK Arthur,,, what in the heck did we do ? Have been driving the car in the heat today and so far,,, I'm knocking on wood here,,, NO surging or missing at all. Does this eliminate the vaccum leak, or has the engine recalibrated itself to compensate ? I mean this thing is running real smooth today. Thanks again.
Good

Either you fixed a leak or the ECU was border-line adapting.

Anyway , you are now running proper base line , BUT, you now have to watch to see if the adaptations start to creep up again..That will mean you still have a leak and if it is large enough, the adap will not be able to handle it.
The suspect I have would be a purge valve . You may want to take the lines off of it and squirt some WD40 in there..that will clean it and stop it from sticking.. I would do that regardless now. Just cuz they get crapped up .
Keep an eye on codes , even if you do not have a CE, as you may catch one before a bunch start coming up.. Just monitor it for a while..as you now have the tool.
Another thing I would do is get on the gas up a few hills , [dropping down to 3rd gear to keep the rpms up and so you don't get busted for speeding.]
That will clean up the 02 sensor a bit..
Lastly, I have had some luck with these new MAF sensors cleaners ..easy enough to do and can't hurt to give it a quick squirt [ CRC MAF cleaner]
The MAF is detrimental to all these a/f mix adaptations.........
Reply With Quote
  #25  
Old 05-24-2007, 12:45 PM
Pete Geither's Avatar
Half Fast Moderator
 
Join Date: Feb 2002
Location: Western Pa.
Posts: 2,417
Arthur,,,, Purge valve ? Sorry, but don't have a clue as to where to find it, but you will only have to tell me once,,, I take notes.
__________________
95 SL500 Smoke Silver, Parchment 64K
07 E350 4matic Station Wagon White 34K
02 E320 4Matic Silver/grey 80K
05 F150 Silver 44K
Reply With Quote
  #26  
Old 05-24-2007, 01:57 PM
Registered User
 
Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,804
Left , inner fender well..says "MOT" on top
One larger vac line from engine manifold going into it, one coming out that goes to the emmissions canister.
It is fed a 12 PULSING sig when car is warm to get the gas fumes from the tank back into the engine for burning..if you place the valve in your hand, it will have a rapid beat to it [ closing/opening] about 6-7 htz.
It purges [ regenerates ]the fumes and does not do it in one gulp b/c if it did , it would effect fuel mix and give you your idle problems. So, a trick is to squirt the WD into the valve out port, let it sit for a while , and then run the engine ..that sucks the crap out of the valve and clears it up so it oscillates again..it is just an emmissions device , but when they stick open, they raise hell with the adaptations parameters of the a/f mixture.
So, I clean them , regardless , just cuz it is easy, cheap, known fault,... and doing so takes that possible out of the a/f mix equation.
Another test guys do when they have adaptation codes pop, is they just unplug the vac line to the purge and cap it..then run the car a few days and see if the adap gets back to norm..that verifies internal leak at purge..only problem w/that technique is you will bring on a purge code..but you know why, so you just clear it later..
Reply With Quote
  #27  
Old 05-24-2007, 02:26 PM
Pete Geither's Avatar
Half Fast Moderator
 
Join Date: Feb 2002
Location: Western Pa.
Posts: 2,417
Took the valve completely off the fenderwell Arthur and the inlet line was plugged with a ton of tiny carbon like particles that came out,,,, probably a teaspoon full. should I just get a new valve or do you think cleaning it will suffice ?
__________________
95 SL500 Smoke Silver, Parchment 64K
07 E350 4matic Station Wagon White 34K
02 E320 4Matic Silver/grey 80K
05 F150 Silver 44K
Reply With Quote
  #28  
Old 05-24-2007, 02:38 PM
Registered User
 
Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,804
If you have it off, get some power to it [I think that is only 6v]. Put a hose on the inlet port and blow through it with a few psi while you rapidly on/off the power . That should clear it good and also tell you if it is open/closing as it should..you can even just blow through it w/lung pressure by mouth..give it the mouth job....
Reply With Quote
  #29  
Old 05-24-2007, 03:08 PM
Pete Geither's Avatar
Half Fast Moderator
 
Join Date: Feb 2002
Location: Western Pa.
Posts: 2,417
Gave it a good cleaning Arthur,,,, I'm beginning to feel real good about this. I am assumming that if the valve is bad or not working properly, it will throw a code ? On the built in reader or use your code reader ?
__________________
95 SL500 Smoke Silver, Parchment 64K
07 E350 4matic Station Wagon White 34K
02 E320 4Matic Silver/grey 80K
05 F150 Silver 44K
Reply With Quote
  #30  
Old 05-24-2007, 03:20 PM
Registered User
 
Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,804
Purge can come back in the DM or pin 8 of HFM module.
It will come back as a purge code , but if it is causing MAF adaptations , it can come back as a rich/lean fuel trim code..so check both.

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




All times are GMT -4. The time now is 11:40 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, 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