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E34 (1989 - 1995)

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  #1  
Old 05-01-2013, 11:16 AM
eeae6000 eeae6000 is offline
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E34 No start plus more problem, help!!

I have a 1991 520I (I live in Germany) and the car was running great. While driving it started acting like it was misfiring and then it stalled out. It will crank over but not start. I have already tested the fuel pump and fuel pump relay and both are good, we ordered the crank sensor but wont be in till friday


the next weird thing is at first the hazards would only work if key was on, then they stopped working all togethor

the third thing is while attempting to crank motor and check various things, i noticed a burning smell and located it, its the ecu, it smelled burnt and was extremely hot.



So my conclussion is its either bad ecu, bad relay/fuse or bad crank sensor, any help????



also no check engine light on
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  #2  
Old 05-01-2013, 11:44 AM
eeae6000 eeae6000 is offline
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I also forgot to mention, right before this all happened, the ground wire that bolts near the thermostat housing broke, so i fixed it, not sure if it shorted something out or not
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  #3  
Old 05-01-2013, 12:17 PM
allenbee allenbee is offline
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Whoa another cut out while driving ! The huns are coming !

It sounds like your dme is dead. A spectacular one at that?

Ohm out your cps. If it is within specs, then check for spark. If you have non, then get a used 520/525 m50 NV dme. There are a few versions, green, brown orange labels. Search for E34_obsession's thread for details about that.

Download the Bentley manual for details of tests etc. Please search these forums for the link.

Also, get a new fuel pump relat and main relay, along with the cps thats on the way. Preventive maintenance if not you will have more no start issues later. Oem only.

Last edited by allenbee; 05-01-2013 at 12:19 PM.
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  #4  
Old 05-01-2013, 12:43 PM
eeae6000 eeae6000 is offline
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sorry little new to BMWS lol

what is DME and where is it located?


The main and fuel relay are both near the ecu correct?

The fuse box for me is different then yours.

will these cause ecu to be hot and the hazard light problem?
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  #5  
Old 05-01-2013, 12:56 PM
eeae6000 eeae6000 is offline
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so the dme is the computer

The problem is the car is 20 mins away on the side of the autobahn at a truck stop, so I go and try things and come back so I am trying to gather numerous attempts at once.

I know fuel pump pumps fuel but unsure if injectors are going off, if I am getting fuel to the rail but not out of the injectors, is this a fuse or relay??

Im hoping one of my friends e34s have the same dme to try out
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  #6  
Old 05-02-2013, 08:04 AM
eeae6000 eeae6000 is offline
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So update here, I am not getting spark at the plugs

the plugs smell strong like fuel but unsure if wet

I pulled the DME, its a green 405

will a american green 405 work in a european car?
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  #7  
Old 05-02-2013, 08:35 AM
allenbee allenbee is offline
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Quote:
Originally Posted by eeae6000 View Post
So update here, I am not getting spark at the plugs

the plugs smell strong like fuel but unsure if wet

I pulled the DME, its a green 405

will a american green 405 work in a european car?
DMEs are engine specific and wiring harness specific. Nationality has nothing to do with it.

For instance, a US 525 bosch dme will not work on an african 525 siemens wiring harness. However, it will work with any 525 that has a bosch wiring harness i.e. a bosch dme.

If you found E34_obsession's thread, you will have the right list of part numbers to search for replacements.

As long as your dme is bosch, you can buy another bosch dme from any 525 NV car without problems.
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  #8  
Old 05-02-2013, 08:53 AM
eeae6000 eeae6000 is offline
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i read his thread, just confused on the DME, I have a 520i so i was not sure if it was the same or not
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  #9  
Old 05-02-2013, 04:05 PM
allenbee allenbee is offline
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525 ecus work just fine in 520s, and vice versa.

Last edited by allenbee; 05-02-2013 at 04:06 PM.
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  #10  
Old 05-02-2013, 08:27 PM
MySatinDoll MySatinDoll is offline
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The "NO START" gremlins have struck again!!!!!

Just joking.

The gas smell is the fuel pump feeding the engine.
Yes your plugs could have a healthy dose of gas on them.

You DME taking a crap is a interesting issue.

Something kicked back to it. I'd try to find out what.
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  #11  
Old 05-03-2013, 06:06 AM
allenbee allenbee is offline
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Dammit MSD that was scary !!!
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  #12  
Old 05-03-2013, 06:08 AM
allenbee allenbee is offline
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Check out your fusible link. It is in a small plastic box connected to your battery. It is the master fuse for the entire car. And if there is a fuse for the ecu ( Is there ? ) Perhaps until you find the source of the short, you should step down its fuse by 5 amps.

Which reminds me. Step down your blower motor's fuse to 20 amps instead of the current 30. This will significantly reduce the risk of cabin fires.
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  #13  
Old 05-10-2013, 11:37 AM
eeae6000 eeae6000 is offline
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Got the new DME today and installed it, car started right up but ran pretty rough but drove, I drove it for about 10 mins and it started acting weird again, dying out, sputtering, stalling etc. Im leaning towards the CPS now but just looking for a little help before spending 92 euro


also, the hazards do not work with the button, if i turn my left signal on it works, but when i turn my right signal on, my 4 ways come on, this only started happening after the dme went out, any thoughts?
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  #14  
Old 05-10-2013, 02:32 PM
upallnight upallnight is offline
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If the cars starts it not the CPS. Sounds like you have a misfire. Should find out why the engine is running rough.
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  #15  
Old 05-11-2013, 05:17 PM
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supertech777 supertech777 is offline
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Re: E34 No start plus more problem, help!!

All this talk about fuel , fuel pumps , grounds , missfires , dme's etc , .. but here's something simple and cheap , how about replacing the
" fuel filter " first just saying

Sent from my Desire HD using BimmerApp mobile app
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  #16  
Old 05-12-2013, 05:47 AM
eeae6000 eeae6000 is offline
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the car starts and runs fine when it is cold, then like **** once it warms up, how the hell is it the fuel filter


Any thoughts on the hazard/blinker problem?
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  #17  
Old 05-12-2013, 07:39 AM
PlasmaE34 PlasmaE34 is offline
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You are dishing out your symptoms in teaspoonfuls. This makes it hard to diagnose.

I guess you don't have the stomp test or a code reader. Well, then do the disconnect test on your drivability sensors. Disconnect and reconnect each one in turn. The one that is damaged, when disconnected, will restore normal running to your engine. The car uses imprecise but problem-free stored default values in place of that sensor, while it is disconnected.

This is assuming the problem is one or more drivability sensors.

Your sensors are the O2 sensor (pull the relay), idle control valve, maf, engine coolant temp sensor, air temp sensor, throttle position sensor (all just the harness connectors only), and that's it. It will take you running back and forth and you need to make sure your hands are protected, the ICV and ects are in tight places and you need this test when you're hot.

In unexpected rough running, the first step is almost always to check on your spark plugs and spark plug wells. However, since it seems be temperature dependant here, it is unlikely that this is the problem zone. But if you can, look at them anyway.

As to your hazard lights this is a long shot but have you checked your fuses in the fuse box, behind the front left shock tower.

Last edited by PlasmaE34; 05-12-2013 at 07:41 AM.
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  #18  
Old 05-12-2013, 08:33 AM
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Bimmerfan84 Bimmerfan84 is offline
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Did you ever check the ignition coils for cracks? They tend to give problems as they warm up if they are bad.
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  #19  
Old 05-12-2013, 09:27 AM
eeae6000 eeae6000 is offline
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It is hard because the whole fuse box is in German and I cannot read it, I am going to try the disconnect test tomorrow, does this work for the cps also?

the coilpacks did not look bad but ill check again.


On the front of the motor there is a wire that grounds to one of the thermostat cover bolts, what is this ground for, i believe this ground is what caused all these problems
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  #20  
Old 05-12-2013, 02:52 PM
PlasmaE34 PlasmaE34 is offline
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Quote:
Originally Posted by eeae6000 View Post
It is hard because the whole fuse box is in German and I cannot read it, I am going
Believe it or not, a friend of mine dealt with the exact situation, like 3 months ago. His solution ? Google translate, on his mobile phone!

Pm an email address to me and i will snap off a picture of ny fuse box sticker to you. Or frankly if you search, im sure you'd get the listings on google
Peehaps print that out and keep it permanently in your car..

Basically any fuse that is screwed wiuld likely be the one you need changed here.

Last edited by PlasmaE34; 05-12-2013 at 02:55 PM.
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  #21  
Old 05-12-2013, 03:51 PM
PlasmaE34 PlasmaE34 is offline
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Quote:
Originally Posted by eeae6000 View Post
the third thing is while attempting to crank motor and check various things, i noticed a burning smell and located it, its the ecu, it smelled burnt and was extremely hot.
n

It really would be a very good idea to have a car electricals specialist look at this physically. DMEs never fry spontaneously even on old E34s and yours did. You probably have a fire risk in your car. Unless you're an expert yourself, you will probably miss very important observations, and the forum to and fro will not help because you are the eyes and ears on the ground.

Electrical troubleshooting is more art than science. Now that your engine is running (although badly), you can take your car in somewhere. Sometimes you just need to bite the bullet for that peace of mind. And apart from going to the workshop, I wouldn't drive this car anywhere else if I were you.

Last edited by PlasmaE34; 05-12-2013 at 03:53 PM.
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  #22  
Old 05-12-2013, 06:42 PM
MySatinDoll MySatinDoll is offline
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Quote:
Originally Posted by eeae6000 View Post
I have a 1991 520I (I live in Germany)
Quote:
Originally Posted by eeae6000 View Post
It is hard because the whole fuse box is in German and I cannot read it,
For some reason this is funny to me.

Sorry again OP just trying to lift your spirits. You'll get it going soon.

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Every once in a while the Lion has to show the Jackals who he is...
- Christopher Walken "The Lion Speech"
95 e34 525 5 spd S52 Swap... The new Garden State Grocery Getter projekt.
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  #23  
Old 05-13-2013, 12:02 AM
paperplane94 paperplane94 is offline
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Sounds like something is going on at the wiring harness in the engine compartment, if all of these symptoms are related.
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  #24  
Old 05-13-2013, 12:44 AM
eeae6000 eeae6000 is offline
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the german fuse box seems to be different then all the ones i have found on google and google translate does not always translate automotive terms correctly, already tried. The car is parked and waiting to be seen, was just hoping to find out what it was
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  #25  
Old 05-13-2013, 01:02 AM
paperplane94 paperplane94 is offline
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How About looking here for your fuse diagram:
http://wedophones.com/BMWManualsLead.htm
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