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 > Diesel Discussion

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 01-31-2005, 11:05 AM
dweller
Guest
 
Posts: n/a
190D turbo cut out?

For my new-to-me 190D turbo, the engine has an odd surging to it. It's very similar to surging from a cruise control, but this happens without the cruise engaged or even attached. It seems to happen mostly at higher rpms.

It's like the engine cuts out and then cuts in again.

I'm wondering if the turbo is cutting out (but I'm totally ignorant of turbos--do they always operate or is there some control?). In doing some reading, I'm suspecting the overboost protection valve or the turbo waste gate, but I'm not clear if failures could be intermittent like on my engine.

Any thoughts? Suggestions? (Remember, I don't know much about turbo operations.)
Reply With Quote
  #2  
Old 01-31-2005, 08:34 PM
Registered User
 
Join Date: Mar 2002
Location: Round Rock Texas
Posts: 137
I havn't had this problem with mine. If you can't find anything in the fuel system (filters), Air is what's left. What RPM do you notice the cut out.
__________________
84 300D 251K
87 190DT 281K - Sold
06 Ford Escape 172K
94 Ford Ranger 250K
99 Chevy Suburban 181K
Reply With Quote
  #3  
Old 01-31-2005, 08:56 PM
dweller
Guest
 
Posts: n/a
Quote:
Originally Posted by rderton
I havn't had this problem with mine. If you can't find anything in the fuel system (filters), Air is what's left. What RPM do you notice the cut out.
It's hard to get the problem to repeat on demand--it's somewhat irregular, but it generally occurs at higher rpms. I suspect something with the turbo because I think it happens only when the turbo is working.
Reply With Quote
  #4  
Old 02-01-2005, 01:43 PM
Registered User
 
Join Date: Mar 2002
Location: Round Rock Texas
Posts: 137
From what I remember the turbo helps mostly on acceleration. Once the car's at speed the horsepower requirments drop. If this problem shows up on acceleration and your filters are clean then the turbo may be your culprit. Otherwise it may take a little more digging.
__________________
84 300D 251K
87 190DT 281K - Sold
06 Ford Escape 172K
94 Ford Ranger 250K
99 Chevy Suburban 181K
Reply With Quote
  #5  
Old 02-01-2005, 03:56 PM
Registered User
 
Join Date: Jan 2005
Location: Yorktown, VA.
Posts: 94
check your fuel lines

I had the same problem, intermittent surging.

There are rubber fuel lines running from the tank outlet/return to the metal lines running forward. On my 85 300SD, one was weeping and there was air in the primary filter. I replaced the leaky hose and used a MityVac with a brake bleed attachment to purge all air from the line. I also replaced a leaky priming pump at the same time. I guess if fuel can get out, air can get in. Seal all possible air leaks and then purge any air from the spin-on filter. Those fixes worked for me. Good luck.
__________________
1985 300SD, 203,000 miles, dark blue

Lil Sarah says: "Poor old Grandma Blue Car...She's sad."
Reply With Quote
  #6  
Old 02-01-2005, 07:10 PM
VeeDubTDI
Guest
 
Posts: n/a
Exclamation You are experiencing over-boost protection.

Check the overboost protection circuit and the turbo's wastegate. If the wastegate ceases to function, the overboost protection circuit will remove boost from the ALDA, and you will lose power. Soon after fuel is cut, the boost drops below the 16 psi overboost limit, the protection circuit restores boost to the ALDA, power and boost increase, and the scenario repeats itself in this "surging" manner.

Symptoms of overboost protection include power surging when you're heavy on the Go Pedal and boost fluctuating between ~8 PSI and 16 PSI (this can be verified with a boost gauge).

Nice car! Good luck getting it working properly again.

Last edited by VeeDubTDI; 02-02-2005 at 01:04 AM.
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
190D 2.5 Turbo Question dbenz Diesel Discussion 15 03-04-2004 12:07 PM
83 300SD Turbo painfull acceleration R Leo Diesel Discussion 12 12-11-2003 12:43 PM
Turbo Replacement kevinaw Diesel Discussion 3 12-11-2002 03:22 PM
Turbo Trouble patterson Diesel Discussion 20 10-02-2002 12:05 PM
turbo for my 1987 190D mplafleur Performance Paddock 2 06-10-2002 10:39 AM



All times are GMT -4. The time now is 02:51 AM.


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