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E34 (1989 - 1995)

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  #51  
Old 01-31-2013, 05:05 AM
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Monsignor Monsignor is offline
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I agree. The only two times my cars couldnt hold an idle at all:
350Z: forgot to reconnect the vacuum line on the intake tube = massive vacuum leak/no pressure built
E28: forgot to put the oil cap back on = massive vacuum leak/no pressure built

Both acted the same way as your car does. And one is 12 years newer and the other 5 years older!!!

Sent from Joe's Galaxy Tab 2 via BimmerApp
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1995 525iA 250k mi
2006 325i/6 57k mi
2003 350Z 88k mi

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  #52  
Old 02-02-2013, 08:44 PM
E34_Obsession E34_Obsession is offline
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The only thing I have left to check is the ICV... All of the Vacuum lines are good, connected, and clamped down...
  #53  
Old 02-03-2013, 12:57 PM
upallnight upallnight is offline
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If you could perform a smoke test, do it to verify that you don't have any leaks.
  #54  
Old 02-20-2013, 06:58 AM
E34_Obsession E34_Obsession is offline
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Today I will be working on the vehicle so I will do a smoke test and confirm that I don't have a vacuum leak. Then I will test the ICV as told by many on here.

If I stopper up and unplug the ICV, would the engine still start?
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1991 BMW E34 525iA

1999 Toyota Tacoma Prerunner Xtracab 2.7L

2008 Toyota Tacoma Prerunner DCSB TRD Sport

1995 Toyota Tacoma 2WD DX V6 - SOLD

1992 Toyota Pickup - SOLD

2003 Subaru Forester 2.5X - TOTALLED

2004 Subaru Forester 2.5XT - SOLD

2005 Subaru WRX Sedan - SOLD
  #55  
Old 02-20-2013, 07:25 AM
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Monsignor Monsignor is offline
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Ok, so i just reread this whole thread to re-familiarize myself. As you'll be with the car today, please do stay online and keep us posted. We are your salvation. I'd also like to rattle off all of my theories, hear them out and take them into deep consideration.
  • when listing MAF, you say good. Did you check the the resistance of it? could you remove it and clean it with a tiny bit of carb cleaner, or i believe they make MAF cleaner now...
  • You end the "air" category with "yadayadayadayadayada"; that yadayadayadayada will be whats causing your car to behave this way potentionally. thorough thorough thorough.
  • be very gently with ICV as the valve itself is rather fragile
  • You said you did a compression test and all numbers were within a good running range, no need for that cylinder wash. UNLESS: cranking without firing has cause the fuel injected to eat the oil helping to seal the rings.
  • Please do check Throttle position sensor for the hell of it. I'd like that peace of mind.
  • Have you tried "manually" controlling your idle by holding the throttle at 25-35%? rather than smashing the pedal over and over?
  • results of smoke test. I'm still betting on a gigantinormic vacuum leak.

please do check back.
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1995 525iA 250k mi
2006 325i/6 57k mi
2003 350Z 88k mi

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  #56  
Old 02-21-2013, 07:00 AM
E34_Obsession E34_Obsession is offline
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Smoke test complete and no vacuum leaks found, and thank you for your help, that goes to everyone on this thread...

Now, no vacuum leaks detected, the resistance on the MAF is correct via the Bentley Manual specs. TPS is good, now I have to focus on the ICV...

How do I go about testing the ICV?

I will be working on the vehicle again today...
__________________
1991 BMW E34 525iA

1999 Toyota Tacoma Prerunner Xtracab 2.7L

2008 Toyota Tacoma Prerunner DCSB TRD Sport

1995 Toyota Tacoma 2WD DX V6 - SOLD

1992 Toyota Pickup - SOLD

2003 Subaru Forester 2.5X - TOTALLED

2004 Subaru Forester 2.5XT - SOLD

2005 Subaru WRX Sedan - SOLD
  #57  
Old 02-21-2013, 07:18 AM
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Monsignor Monsignor is offline
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Quote:
Originally Posted by E34_Obsession View Post
Smoke test complete and no vacuum leaks found, and thank you for your help, that goes to everyone on this thread...

Now, no vacuum leaks detected, the resistance on the MAF is correct via the Bentley Manual specs. TPS is good, now I have to focus on the ICV...

How do I go about testing the ICV?

I will be working on the vehicle again today...
ICV is under the intake manifold. This will probably be your only project today...

DIY ICV Cleaning via bimmerwerks

Best of luck
__________________


1995 525iA 250k mi
2006 325i/6 57k mi
2003 350Z 88k mi

Instagram: @Titan_E34
Snapchat: Titan_E34

Last edited by Monsignor; 02-21-2013 at 07:23 AM.
  #58  
Old 02-21-2013, 07:21 AM
E34_Obsession E34_Obsession is offline
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Right I know where it is, would a sudden jerk or bump destroy an ICV?
__________________
1991 BMW E34 525iA

1999 Toyota Tacoma Prerunner Xtracab 2.7L

2008 Toyota Tacoma Prerunner DCSB TRD Sport

1995 Toyota Tacoma 2WD DX V6 - SOLD

1992 Toyota Pickup - SOLD

2003 Subaru Forester 2.5X - TOTALLED

2004 Subaru Forester 2.5XT - SOLD

2005 Subaru WRX Sedan - SOLD
  #59  
Old 02-21-2013, 07:24 AM
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Monsignor Monsignor is offline
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Quote:
Originally Posted by E34_Obsession View Post
Right I know where it is, would a sudden jerk or bump destroy an ICV?
if i smashed it "suddenly" with a sledgehammer? sure. bumps in the road? nope. They're strong (being BMW built) but the valve is very sensitive...
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1995 525iA 250k mi
2006 325i/6 57k mi
2003 350Z 88k mi

Instagram: @Titan_E34
Snapchat: Titan_E34
  #60  
Old 02-21-2013, 07:32 AM
E34_Obsession E34_Obsession is offline
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Ok I will take note of that and be cautious. Now If I unplug the valve and stopper up the hoses to and from it would still start and run?!?
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1991 BMW E34 525iA

1999 Toyota Tacoma Prerunner Xtracab 2.7L

2008 Toyota Tacoma Prerunner DCSB TRD Sport

1995 Toyota Tacoma 2WD DX V6 - SOLD

1992 Toyota Pickup - SOLD

2003 Subaru Forester 2.5X - TOTALLED

2004 Subaru Forester 2.5XT - SOLD

2005 Subaru WRX Sedan - SOLD
  #61  
Old 02-21-2013, 07:35 AM
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Monsignor Monsignor is offline
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Location: Pineapple Under the Sea
 
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I'm not entirely sure. My best guess would be that it would take note of Throttle position sensor and MAF to run.

the point of doing that would be to isolate the problem, yes? you could try it and let us know, i dont see how it could damange the car, maybe throw and store problematic codes but hey, we're on a new frontier, aren't we?
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1995 525iA 250k mi
2006 325i/6 57k mi
2003 350Z 88k mi

Instagram: @Titan_E34
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Last edited by Monsignor; 02-21-2013 at 07:36 AM.
  #62  
Old 02-21-2013, 07:46 AM
E34_Obsession E34_Obsession is offline
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Haha I guess so. I will be working on the vehicle this evening and will report back on what I find.
__________________
1991 BMW E34 525iA

1999 Toyota Tacoma Prerunner Xtracab 2.7L

2008 Toyota Tacoma Prerunner DCSB TRD Sport

1995 Toyota Tacoma 2WD DX V6 - SOLD

1992 Toyota Pickup - SOLD

2003 Subaru Forester 2.5X - TOTALLED

2004 Subaru Forester 2.5XT - SOLD

2005 Subaru WRX Sedan - SOLD
  #63  
Old 02-21-2013, 07:48 AM
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Monsignor Monsignor is offline
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Location: Pineapple Under the Sea
 
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if you try to run it with the ICV disconected and isolated, i will be very interested in results.
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1995 525iA 250k mi
2006 325i/6 57k mi
2003 350Z 88k mi

Instagram: @Titan_E34
Snapchat: Titan_E34
  #64  
Old 02-21-2013, 08:27 AM
E34_Obsession E34_Obsession is offline
"The sound of the M50"
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I will keep you posted in what happens... Thanks for replying to my thread for so long!
__________________
1991 BMW E34 525iA

1999 Toyota Tacoma Prerunner Xtracab 2.7L

2008 Toyota Tacoma Prerunner DCSB TRD Sport

1995 Toyota Tacoma 2WD DX V6 - SOLD

1992 Toyota Pickup - SOLD

2003 Subaru Forester 2.5X - TOTALLED

2004 Subaru Forester 2.5XT - SOLD

2005 Subaru WRX Sedan - SOLD
  #65  
Old 02-21-2013, 08:28 AM
Monsignor's Avatar
Monsignor Monsignor is offline
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Location: Pineapple Under the Sea
 
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never a problem. I live for diagnosing and troubleshooting. It's what we're here for.
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1995 525iA 250k mi
2006 325i/6 57k mi
2003 350Z 88k mi

Instagram: @Titan_E34
Snapchat: Titan_E34
  #66  
Old 02-21-2013, 09:40 AM
Mamij Mamij is online now
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Quote:
Originally Posted by Monsignor View Post
ICV is under the intake manifold. This will probably be your only project today...

DIY ICV Cleaning via bimmerwerks

Best of luck
The icv is new according to the op and no bad icv can cause those problems as seen on his video. Possibly due to either icv hose being disconnected but even then, the engine would not die quickly just sound terrible
  #67  
Old 02-21-2013, 10:40 AM
Mamij Mamij is online now
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Quote:
Originally Posted by Monsignor View Post
never a problem. I live for diagnosing and troubleshooting. It's what we're here for.
it would be better and more useful if you could give the op a baseline by doing an icv unplug and an icv hose disconnect both plugged and unplugged, and posting your observations. Since your engine is working fine and is the same as his. I would help but mine is an m52
  #68  
Old 02-21-2013, 11:10 AM
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Monsignor Monsignor is offline
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M52 is just as close to his as mine is, so how about you go tear into your running car? Mine is a VANOS and his isnt.

Also my car is not running now, thanks though. Its not registered or insured and I have not installed my battery.

OP's "new" ICV could without a doubt be faulty and please oh please tell me how an IDLE CONTROL VALVE wouldn't be suspect in a terrible idle? Also, hose is not disconnected a smoke test confirmed, please read entire thread before posting, simple TOU...
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1995 525iA 250k mi
2006 325i/6 57k mi
2003 350Z 88k mi

Instagram: @Titan_E34
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Last edited by Monsignor; 02-21-2013 at 11:18 AM.
  #69  
Old 02-22-2013, 07:17 AM
E34_Obsession E34_Obsession is offline
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An ICV would cause this issue, as many on this thread have said. I got busy yesterday and couldn't work on the vehicle. I will get around to it today.

Now I will remove the ICV and clean it out, plus test resistance and test its function today and get back to you later today
__________________
1991 BMW E34 525iA

1999 Toyota Tacoma Prerunner Xtracab 2.7L

2008 Toyota Tacoma Prerunner DCSB TRD Sport

1995 Toyota Tacoma 2WD DX V6 - SOLD

1992 Toyota Pickup - SOLD

2003 Subaru Forester 2.5X - TOTALLED

2004 Subaru Forester 2.5XT - SOLD

2005 Subaru WRX Sedan - SOLD
  #70  
Old 02-22-2013, 07:18 AM
E34_Obsession E34_Obsession is offline
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Mamij, read the forum before you post, like all the others do.
__________________
1991 BMW E34 525iA

1999 Toyota Tacoma Prerunner Xtracab 2.7L

2008 Toyota Tacoma Prerunner DCSB TRD Sport

1995 Toyota Tacoma 2WD DX V6 - SOLD

1992 Toyota Pickup - SOLD

2003 Subaru Forester 2.5X - TOTALLED

2004 Subaru Forester 2.5XT - SOLD

2005 Subaru WRX Sedan - SOLD
  #71  
Old 02-22-2013, 10:07 AM
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Monsignor Monsignor is offline
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Location: Pineapple Under the Sea
 
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So we delete my post but let that ^ stay? Super cool...

OP please update on ICV
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1995 525iA 250k mi
2006 325i/6 57k mi
2003 350Z 88k mi

Instagram: @Titan_E34
Snapchat: Titan_E34

Last edited by Monsignor; 02-22-2013 at 10:13 AM.
  #72  
Old 02-22-2013, 01:44 PM
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_Ethrty-Andy_ _Ethrty-Andy_ is offline
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This thread keeps needing mod attention.

Locked
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E30 above Sold

E34 V12 Project Thread Here: http://www.bimmerfest.com/forums/sho...=502437&page=4
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