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Old 06-29-2008, 05:06 AM   #1
Luke318is
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No start diagnostics...please shed some light.

Hi everyone, im looking for any technical help i can get here, before i pay for a tow to my shop.

Ok heres the deal: the car runs great when it decides to run, which is intermittent. I had the car at the shop and it started 10 times with no problems, so they gave it back. The next day it wont start again, and that was a week ago. Since then i have done a bunch of diagnostics to figure out the problem, now i am no mechanic, but i do have perserverence! so here is a list of what i have done.

FUEL SYSTEM: -No fuel coming to engine

-Replaced main relay
-Jumped the fuel pump relay at leads 87 and 30, which should force the fuel pump to run.
-Fuel pump did not run
-No voltage at fuel pump power connector
-Jumped the fuel pump with +12volt, fuel pump runs.
-fuel pump relay socket has voltage at all the right spots
-fuse 11 has no voltage, that is the fuel system fuse correct?
-deduced that power is not getting from fuel pump relay to fuse box,
-tried to crank the engine with pump running from +12volt jump
-engine no starts, and has NO spark from plug connected to the coil
-pulled computer and checked solder joints, no visible problems
-fuel pump is less than 6 months old
-i dont have a wiring diagram for the fuel pump system, so i dont know what path the signal takes from the relay back to the pump or whatever...

What could cause the engine to lose spark AND stop voltage from getting to the fuel pump power connector?

Im at a loss here...would like to find the problem instead of paying the shop to diagnose.
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1982 528e -Sold.
1991 318is -Written off, parting out currently.
1984 318i -Beater while car shopping.
1990 ///325i -Imported Mtech2 model, purchased May 28
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Old 06-29-2008, 09:06 AM   #2
FuryriderX
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maybe that will help you.
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Old 06-29-2008, 12:56 PM   #3
InfiniteDice
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Once upon a time... I had these strange intermittent starting and stalling issues. Turned out to be a corroded fusible link in the trunk. It's a real long shot, but 1.5ft north of the battery, under some heat shrink. Recover it if you decide to take a look.
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Old 06-29-2008, 01:04 PM   #4
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well, that fusible link is indeed in the battery path to the starter. good suggestion - i would never have thought of it.
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Old 06-29-2008, 02:33 PM   #5
Luke318is
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I looked for this fusible link, the bentley manual suggested it, ill take a look for it. It all started after the car sat for a few months actually, so corrosion is a possibility.

Will Crank position sensor stop fuel AND spark?
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Last edited by Luke318is; 06-29-2008 at 02:50 PM.
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Old 06-29-2008, 07:40 PM   #6
FuryriderX
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no rpm, no fuel, no spark, no run. check that fusible link first. crank position sensors dont die that often.
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Old 06-30-2008, 03:34 AM   #7
Luke318is
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what does it look like?
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1990 ///325i -Imported Mtech2 model, purchased May 28
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Old 06-30-2008, 03:57 PM   #8
FuryriderX
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there's 2 wires going toward the engine bay from the battery. one thick one, one thin one. the fusible link is in the thin one. you'll know it when you see it. it may be wrapped in electrical tape/shrinkwrap.
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Old 06-30-2008, 04:23 PM   #9
Luke318is
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Found a solution !!!


flatbed.jpg
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1982 528e -Sold.
1991 318is -Written off, parting out currently.
1984 318i -Beater while car shopping.
1990 ///325i -Imported Mtech2 model, purchased May 28
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Old 07-01-2008, 11:12 PM   #10
Euro_E30
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Check the DME seen many problems with e30 no start that are DME
related. try a new DME, or crank the motor and tap the DME with a screw driver at the same time. Hopefully that helps
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Old 07-01-2008, 11:16 PM   #11
craz azn
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Quote:
Originally Posted by Luke318is View Post
Found a solution !!!
You can drop it off right at my door
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Old 07-03-2008, 01:43 AM   #12
Luke318is
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Quote:
Originally Posted by craz azn View Post
You can drop it off right at my door
10-4 Haha

Anyways, i did a visual check of the computer, didnt see any noticeable bad solder joints, except possibly this one:
http://www.maxbimmer.com/forums/show...70#post1172070


It was the crank position sensor after all...fired right up when it was replaced. Now its lowering springs going in next week, then a full out detail at a local shop, cant wait!
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1991 318is -Written off, parting out currently.
1984 318i -Beater while car shopping.
1990 ///325i -Imported Mtech2 model, purchased May 28
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Old 08-26-2012, 06:41 AM   #13
dannyau
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Quote:
Originally Posted by Luke318is View Post
Hi everyone, im looking for any technical help i can get here, before i pay for a tow to my shop.

Ok heres the deal: the car runs great when it decides to run, which is intermittent. I had the car at the shop and it started 10 times with no problems, so they gave it back. The next day it wont start again, and that was a week ago. Since then i have done a bunch of diagnostics to figure out the problem, now i am no mechanic, but i do have perserverence! so here is a list of what i have done.

FUEL SYSTEM: -No fuel coming to engine

-Replaced main relay
-Jumped the fuel pump relay at leads 87 and 30, which should force the fuel pump to run.
-Fuel pump did not run
-No voltage at fuel pump power connector
-Jumped the fuel pump with +12volt, fuel pump runs.
-fuel pump relay socket has voltage at all the right spots
-fuse 11 has no voltage, that is the fuel system fuse correct?
-deduced that power is not getting from fuel pump relay to fuse box,
-tried to crank the engine with pump running from +12volt jump
-engine no starts, and has NO spark from plug connected to the coil
-pulled computer and checked solder joints, no visible problems
-fuel pump is less than 6 months old
-i dont have a wiring diagram for the fuel pump system, so i dont know what path the signal takes from the relay back to the pump or whatever...

What could cause the engine to lose spark AND stop voltage from getting to the fuel pump power connector?

Im at a loss here...would like to find the problem instead of paying the shop to diagnose.
Hi can anyone tell me where the fusable link is on an Australian 1991 318i if you have a photo it would help
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Old 08-26-2012, 08:18 AM   #14
Ceeker
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where is the battery located? it is about 1.5 feet from the battery along the positive terminal line.
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Old 08-26-2012, 08:32 AM   #15
dannyau
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The Battery is on the right hand side in the engine bay, and none of the power leads are any longer than about 6 inchs
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