Re: [MBZ] Alda Line
When the E300D decided to do the limp home thing in WY, I had to get to the SLC dealer and all they could find were five codes that told them nothing. There were five techs wandering around the car scratching heads. Reset the EGR and everything was good again. Four and a half hours, bad donut, weak coffee and I was on my way, no money out of pocket. On Friday, July 8, 2005, at 03:52 PM, Marshall Booth wrote: John Peterson wrote: So, while I'm at the process of cleaning out the injectors I clean the banjo fitting- good. Then I check hoses from the Alda to the vacuum amplifier (blue disk shaped thing) and they let air pass okay. But here's the strange thing- with the Y adapter that attacheds to the ALDA disconnected the car drives equally slow. I have 2 2.5's -- this one has less power (although has gotten better with the purge) If I disconnect the Y at the ALDA, I should see some performance difference, no? What to check next? The 300D 2.5, 124.128 is fundamentally similar to earlier diesels, but it's more complex emission controls make diagnosis of problems more complex. Sounds like you are in the limp home mode (no turboboost/fuel enrichment). This may be because the EGR is not properly functioning (it can't easily be disabled as it can be in earlier diesels) because the pressure sensor has shorted out, the boost pressure is vented, etc., etc. Check EGR operation. I'm not sure how useful the computer readouts are. You need to start by measuring the 0-62 mph acceleration time, then check what boost pressure to the ALDA actually is (should reach 800 millibar between 1600-2000 rpm under full load with the pedal to the floor). Disconnecting ANYTHING is likely to do NOTHING or reduce power! I've attached vacuum diagrams of the 602.96 engines used in 124s with auto transmissions (will be stripped from the list copy). Marshall -- Marshall Booth (who doesn't respond to unsigned questions) der Dieseling Doktor [EMAIL PROTECTED] '87 300TD 181Kmi,'87 190D 2.5 199Kmi, '84 190D 2.2 227Kmi, '85 190D 2.0 159Kmi, '87 190D 2.5 turbo 234kmi Diesel Technical Advisor MBCA, member GWSection http://www.dhc.net/~pmhack/mercedes/mbooth1.htm 124.128Vac.pdf___ For used parts email [EMAIL PROTECTED] For new parts see www.buymbparts.com For repairs see www.oldworldauto.com To Unsubscribe or change delivery options go to: http://striplin.net/mailman/listinfo/mercedes_striplin.net -- Clay Seattle Bioburner 1972 220D - Gump 1995 E300D - Cleo 1987 300SDL - POS - DOA
Re: [MBZ] Alda Line
I think that you are right, Marshall, and it could be in limp home mode.
It is driving at what I would describe as 2/3 power. The boost is probably
not happening. Is there any diagnosis procedure (where to begin) other than
buying fancy computer equipment? Are there any things to check manually?
Should I try resetting the computer by pulling the battery or other
procedure?
Thanks
John Peterson
1990 300D 2.5 127k
1991 300D 2.5 73k
- Original Message -
From: Marshall Booth [EMAIL PROTECTED]
To: Mercedes mailing list [EMAIL PROTECTED]
Sent: Friday, July 08, 2005 7:48 PM
Subject: Re: [MBZ] Alda Line
John Peterson wrote:
Correction- yes, it runs from the ALDA to the electric valve. I will try
to round up some hose to run from the banjo to the ALDA.
The car feels like it is starving for fuel- but it could be that the
turbo is running but the ALDA is not sending the signal to the pump for
additional fuel. I also suspect a clogged intake screen in the tank could
be a possibility- but wouldn't there be lots of air in the pre filter or
other visible evidence of a clogged screen?
Could this be as simple as clogged injectors, or is an ALDA / pressure
issue more likely?
The later ('90+) OM60x.96 engines opened the wastegate when the emissions
control system was detected to be not properly operating or boost was
excessive. This of course leaves you with NO boost so NO fuel enrichment.
In addition, the wastegate OR the EGR could be stuck open!
Marshall
--
Marshall Booth (who doesn't respond to unsigned questions)
der Dieseling Doktor [EMAIL PROTECTED]
'87 300TD 181Kmi,'87 190D 2.5 199Kmi, '84 190D 2.2 227Kmi, '85 190D 2.0
159Kmi, '87 190D 2.5 turbo 234kmi
Diesel Technical Advisor MBCA, member GWSection
http://www.dhc.net/~pmhack/mercedes/mbooth1.htm
___
For used parts email [EMAIL PROTECTED]
For new parts see www.buymbparts.com
For repairs see www.oldworldauto.com
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Re: [MBZ] Alda Line
In a message dated 7/8/2005 2:21:38 P.M. US Mountain Standard Time, [EMAIL PROTECTED] writes: So, while I'm at the process of cleaning out the injectors I clean the banjo fitting- good. Then I check hoses from the Alda to the vacuum amplifier (blue disk shaped thing) and they let air pass okay. But here's the strange thing- with the Y adapter that attacheds to the ALDA disconnected the car drives equally slow. I have 2 2.5's -- this one has less power (although has gotten better with the purge) If I disconnect the Y at the ALDA, I should see some performance difference, no? What to check next? John, I don't know why your ALDA would be connected to the vacuum amplifier (normally this is for the auto transmission modulator)! From the banjo on the intake manifold, the pressure signal should go through a normally open electric valve (part of over boost protection) and then to the ALDA. On yours there may be a tee in the line for an electronic sensor/monitor. For a GOOD test, you should run a pressure line directly from the banjo fitting to the ALDA. Please review your connections and try the test I mentioned. Jim Friesen Phoenix AZ 79 300SD, 261 K miles 98 ML 320, 136 K miles
Re: [MBZ] Alda Line
Correction- yes, it runs from the ALDA to the electric valve. I will try to round up some hose to run from the banjo to the ALDA. The car feels like it is starving for fuel- but it could be that the turbo is running but the ALDA is not sending the signal to the pump for additional fuel. I also suspect a clogged intake screen in the tank could be a possibility- but wouldn't there be lots of air in the pre filter or other visible evidence of a clogged screen? Could this be as simple as clogged injectors, or is an ALDA / pressure issue more likely? - Original Message - From: [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Friday, July 08, 2005 5:46 PM Subject: Re: [MBZ] Alda Line In a message dated 7/8/2005 2:21:38 P.M. US Mountain Standard Time, [EMAIL PROTECTED] writes: So, while I'm at the process of cleaning out the injectors I clean the banjo fitting- good. Then I check hoses from the Alda to the vacuum amplifier (blue disk shaped thing) and they let air pass okay. But here's the strange thing- with the Y adapter that attacheds to the ALDA disconnected the car drives equally slow. I have 2 2.5's -- this one has less power (although has gotten better with the purge) If I disconnect the Y at the ALDA, I should see some performance difference, no? What to check next? John, I don't know why your ALDA would be connected to the vacuum amplifier (normally this is for the auto transmission modulator)! From the banjo on the intake manifold, the pressure signal should go through a normally open electric valve (part of over boost protection) and then to the ALDA. On yours there may be a tee in the line for an electronic sensor/monitor. For a GOOD test, you should run a pressure line directly from the banjo fitting to the ALDA. Please review your connections and try the test I mentioned. Jim Friesen Phoenix AZ 79 300SD, 261 K miles 98 ML 320, 136 K miles -- ___ For used parts email [EMAIL PROTECTED] For new parts see www.buymbparts.com For repairs see www.oldworldauto.com To Unsubscribe or change delivery options go to: http://striplin.net/mailman/listinfo/mercedes_striplin.net
