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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 7 Series / 8 Series > 7 Series - E38 (1995 - 2001)

7 Series - E38 (1995 - 2001)

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  #1  
Old 11-13-2012, 10:56 PM
cardscoach cardscoach is offline
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Location: northern wisconsin
 
Join Date: Nov 2012
Posts: 5
Mein Auto: 1995 740i
start, no start, driving me nuts

my 95 7 ran really good on friday night....reached in to start it sunday night and it started then died. would not restart. the motor sounded really funny when i tried to restart it too, like there was no compression. i thought i had broke a timing chain, but no. thought i had a tech read the computer for codes, but it turns out he did not. got to chasing the no start, and did a compression test on left bank. 100, 80, 60, 40 lbs front back. not good. however, car ran perfectly, no bad idle, and showed me getting 23mpg a week before. absolutely no problem with how it ran prior to no start. so now i have motor torn down, head off, and am now wondering if there is a sensor in the car that would prevent it from starting, or shut it down after it had started. i am furious with my wrench for not scanning the car!! im checking numbers for the non recalled block number, so im probably heading towards replacing motor. however, i would also consider rebuilding heads if motor is not nikosil. am really lost as to why it quit and then would not start. i have read hundreds of forums, and they help, but not nailing it down for me. any ideas would be appreciated.
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  #2  
Old 11-14-2012, 06:39 AM
cardscoach cardscoach is offline
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Location: northern wisconsin
 
Join Date: Nov 2012
Posts: 5
Mein Auto: 1995 740i
ok, i know this is complicated. lets start like this....is there any safety feature on the car that will keep if from starting ?
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  #3  
Old 11-14-2012, 04:33 PM
chrisn7 chrisn7 is offline
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Location: Huddersfield, West Yorks
 
Join Date: Oct 2011
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Mein Auto: 750iL
Couple of things come to mind. Starting then stopping is a typical fuel problem, and this is a 95 car - has the fuel filter been changed? The engine might be starved of fuel. A failing camshaft sensor will alow the car to start, run for a bit, then stalls. A couple of turns on the key, it re-starts, on so on.
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  #4  
Old 11-14-2012, 08:22 PM
cardscoach cardscoach is offline
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Location: northern wisconsin
 
Join Date: Nov 2012
Posts: 5
Mein Auto: 1995 740i
i dont think so

no running issues in the previous month. i felt like the sound of the engine had changed dramatically after it quit running. the sound of it as it turned over that is. i tried for a couple days to restart it. even wore the battery down cranking on it. i gave it some starting fluid as a buddy cranked also. ....nothing. not even a sputter. my initial reaction to the sound of the motor was that i had either broke a timing chain, or broke the crank. it there a module that retards or advances the timing so as not to allow a start?
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  #5  
Old 11-15-2012, 01:48 AM
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BMWFatherFigure BMWFatherFigure is offline
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Location: Perth, Western Australia
 
Join Date: Aug 2012
Posts: 2,625
Mein Auto: E23;E30;E38;E32;E34 +
I hope this isn't a egg sucking lesson for granny. 1) Do a compression check again and get some numbers. They should all be 120psi minimum. If not see your wrench with a writ. 2) Pull off start wire from starter motor, join a gauge to the fuel rail(s) and get a mate to hold the key in P3 (start). The pump(s) will run and give you a pressure reading. If you are about 40psi it's good. If not see your wrench with another writ. 3) Pull a plug wire (or coil pack) reconnect starter wire and check for spark when engine turning over. If you have a spark then it's a basic timing issue - cam and sensors out of sync. If no spark it's either crank sensor problems or EWS related. Could be as simple as recoding a key, multi-plug half out, blown fuse, blown relay, bad sensor or even no fuel (Yes I got caught). If it's the EWS box then I won't even pretend I can fix that!!
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Current:
E23 735i; E32 735iL (X 2 - 1 Alpine White and 1 Glacier Blue); E34 535i; E38 735iL; R50 Cooper; R55 Cooper Clubman.
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  #6  
Old 11-15-2012, 07:52 PM
cardscoach cardscoach is offline
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Location: northern wisconsin
 
Join Date: Nov 2012
Posts: 5
Mein Auto: 1995 740i
i like the way your thinking daddy-o

thanks for all. i cant recheck the left bank, mainly because my head is holding down paper on my desk. that thing is cool....i just sit and stare at it sometimes.
i had a good fuel pressure test. spark about knocked me on my butt. im down to either rebuidling the motor i have, i need to check some block numbers....or purchasing a new motor. i just wish i knew why it quit running. i have never been around a motor that shut off becuase of lack of compression. thanks for your thought process. :thumbup
ive always wanted to build a motor...maybe nows my chance
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  #7  
Old 11-15-2012, 08:08 PM
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BMWFatherFigure BMWFatherFigure is offline
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Location: Perth, Western Australia
 
Join Date: Aug 2012
Posts: 2,625
Mein Auto: E23;E30;E38;E32;E34 +
Done more builds than I care to remember. PM me if you get stuck. If I can't help I have mates who will know.

A thought on EWS - I think that if you get dash lights and cranking then EWS good. As I said I will not pretend to know about that box other than its a PAIN!!
__________________
Good - Fast - Cheap: Pick any two.
Current:
E23 735i; E32 735iL (X 2 - 1 Alpine White and 1 Glacier Blue); E34 535i; E38 735iL; R50 Cooper; R55 Cooper Clubman.
Previous:
E21 318i; E30 318i; E32 735iL; E34 535i; E38 730iL; E53 4.4i

Last edited by BMWFatherFigure; 11-15-2012 at 08:10 PM.
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