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20
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08/17/09
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Re: 1990 750il running only on six cylinders,1-6 "---ASC---"
Posted:
Aug 19, 2009 2:37 PM
in response to: justin750il
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Would you happen to have list of any reputable independent shops in Sacramento,California that would have the equipment and software to diagnose my problem?
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Posts:
4,669
Registered:
12/09/03
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Re: 1990 750il running only on six cylinders,1-6 "---ASC---"
Posted:
Aug 19, 2009 2:39 PM
in response to: justin750il
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For sure. Lots of CA shops in the BIMRS group. www.bimrs.org. Let me know who you decide to take it to.
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20
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08/17/09
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Re: 1990 750il running only on six cylinders,1-6 "---ASC---"
Posted:
Aug 19, 2009 2:47 PM
in response to: Charlie
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Thanks a lot.I really appreciate it.
Justin
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4,669
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12/09/03
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Re: 1990 750il running only on six cylinders,1-6 "---ASC---"
Posted:
Aug 19, 2009 2:50 PM
in response to: justin750il
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Ask them straight up if they are experienced servicing the V12s. Some guys may actually be too young to know that engine. I personally don't know any of the techs/owners at the Sacramento shops listed, but know lots of San Fran folks.
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20
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08/17/09
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Re: 1990 750il running only on six cylinders,1-6 "---ASC---"
Posted:
Aug 20, 2009 2:09 PM
in response to: justin750il
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From your perspective,what are the characteristics of limp mode,or should I say,how does limpmode work? In your opinion.I have heard different things.
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Posts:
4,669
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12/09/03
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Re: 1990 750il running only on six cylinders,1-6 "---ASC---"
Posted:
Aug 20, 2009 2:22 PM
in response to: justin750il
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Well your car is very old, just the beginning of OBD and limp home. I think it depends on the fault, but from recolection, the trans will set to 3rd gear and the EML range will be reduced to something like 0-20%. I'll see if can find any old trainings on your DME/EML.
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20
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08/17/09
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Re: 1990 750il running only on six cylinders,1-6 "---ASC---"
Posted:
Aug 21, 2009 12:58 PM
in response to: Charlie
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I found someone else who has the same problem His is a 1993.He thought it was limp mode.So apparently it happens to other years.His EML light comes on though,mine comes on,then goes out after you start it.He just bought his too,so Im thinking this is why people are selling them.
He too has had a dead battery. I wonder if that has anything to do with it?Or maybe there is some special thing your supposed to do when that happens that nobody knows about,you know,some special order your supposed to do,like,open the door five times,step on the brake pedal,turn the key,get out,open the gas cap,let two pounds of air out of your left front tire,get back in take, the key out, pick up your factory cell phone,call a tow truck.
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6
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08/26/04
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Re: 1990 750il running only on six cylinders,1-6 "---ASC---"
Posted:
Aug 21, 2009 4:14 PM
in response to: justin750il
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Hello. BMW´s 7serie has different wiring diagram for each year. By the way, you may have a problem with the fuel pump relay. It has has two pump relays and one of those also give power to the ABS and or ASC. Since your engine runs for a second or two, I am very sure that it is the relay. Found in the box on right side in front of the strut tower.
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20
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08/17/09
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Re: 1990 750il running only on six cylinders,1-6 "---ASC---"
Posted:
Aug 21, 2009 4:40 PM
in response to: Roadrunner51
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Ive swapped those two,also the main relays,it doesnt to affect the abs,just says ASC in the check control display.
Ill check them again though,Thanks.
Message was edited by: justin750il |
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6
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08/26/04
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Re: 1990 750il running only on six cylinders,1-6 "---ASC---"
Posted:
Aug 21, 2009 5:34 PM
in response to: justin750il
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Have you checked all the fuses? I know you have, but very often it is bad connection in the contact points. Use to be more than one. Sometimes tree or four. If they looks ok or with a test lamp they seems to be ok. Pull them out and clean them. It is very often bad connection in the clamp. Use CRC 556 or simmilar in the contact points.
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20
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08/17/09
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Re: 1990 750il running only on six cylinders,1-6 "---ASC---"
Posted:
Aug 21, 2009 7:38 PM
in response to: Roadrunner51
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I've checked the fuses,but ill try the contact points better.Thanks.
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20
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08/17/09
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Re: 1990 750il running only on six cylinders,1-6 "---ASC---"
Posted:
Sep 11, 2009 1:43 PM
in response to: justin750il
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So this is what I think is happening.
On start-up,the engine misses because the DME's/throttle bodies aren't synchronized.At that point the ASC senses a load and changes the timing,which weakens the spark and floods the cylinders on the left side.This is just a guess.Would that sound like something that could be happening?How do I correct that? It's like a loop it's stuck in.I can't sync the DME's/throttle bodies because of the ASC/timing.You just can't get it to 5000 rpm three consecutive times around here.It takes too long to get it to 5000 rpm.
Thanks,
Justin.
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1
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04/06/08
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Re: 1990 750il running only on six cylinders,1-6 "---ASC---"
Posted:
Sep 19, 2009 9:03 PM
in response to: justin750il
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It seems to me that you have a problem with the mass airflow on the side that do not work.
Good luck
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515
Registered:
08/17/05
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Re: 1990 750il running only on six cylinders,1-6 "---ASC---"
Posted:
Sep 20, 2009 8:56 AM
in response to: Freddy04
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The first model years of the E32 had many issues: dead starter batteries (over night), steering wheel vibrations (with and without brake input), engine oil leaks (M70).
This was most likely the worst BMW ever produced and sold, in respect to reliability and quality. If you want to read horror stories: www.my750.com
Justin: BMW had published detailed factory repair manuals (for their dealers) for the early E32 vehicles, about 3" thick binders, they included wiring diagrams.
Perhaps you can find one on ebay, etc.
I personally think the E32/M70 was amazing car. Nothing can beat a V12...but, but, but...
Good Luck
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