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E34 (1989 - 1995)

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  #1  
Old 03-14-2013, 10:58 AM
Gehrke33 Gehrke33 is offline
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Mein Auto: 94 bmw 525i
94 bmw 525i dme problems

Hi guys I am new to this site, I have a 94 bmw 525i and I was wondering if I could put a used dme in the car. I have heard conflicting reports on this. Any insight you could offer would be appreciated. Thanks

Matt
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  #2  
Old 03-14-2013, 11:12 AM
BMR_LVR's Avatar
BMR_LVR BMR_LVR is offline
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Location: Asheboro, NC
 
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Mein Auto: 1992 525i
You can use a used red label DME ending in 413. It is for vanos M50 engines which you have. You do not have EWS II, so you don't have to worry about that.
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Quote:
Originally Posted by noego View Post
It's Deja Poo - as in, I've heard this **** before.
Steve

Calypso Red 1992 525i with 200K miles

1991 735i - Sold
1992 525i - Sold
1995 325is - Sold
2000 528i - Sold


Last edited by BMR_LVR; 03-14-2013 at 11:51 AM.
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  #3  
Old 03-14-2013, 11:41 AM
Gehrke33 Gehrke33 is offline
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Mein Auto: 94 bmw 525i
thanks a lot steve, i will get a used one and give it a wirl.
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  #4  
Old 03-14-2013, 12:08 PM
Gehrke33 Gehrke33 is offline
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do i need to swap the chip from my old one to my new one?
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  #5  
Old 03-14-2013, 12:20 PM
BMR_LVR's Avatar
BMR_LVR BMR_LVR is offline
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Location: Asheboro, NC
 
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Quote:
Originally Posted by Gehrke33 View Post
do i need to swap the chip from my old one to my new one?
Not unless you have an aftermarket chip or a chip that has been mapped with increased performance parameters. If you are stock, just swap the DME.
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Most problems are usually something simple !

Quote:
Originally Posted by noego View Post
It's Deja Poo - as in, I've heard this **** before.
Steve

Calypso Red 1992 525i with 200K miles

1991 735i - Sold
1992 525i - Sold
1995 325is - Sold
2000 528i - Sold

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  #6  
Old 03-14-2013, 12:22 PM
Gehrke33 Gehrke33 is offline
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great thanks
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  #7  
Old 03-14-2013, 12:44 PM
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BMR_LVR BMR_LVR is offline
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Location: Asheboro, NC
 
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My pleasure. Please report back to let us know if it fixes your problem.
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Most problems are usually something simple !

Quote:
Originally Posted by noego View Post
It's Deja Poo - as in, I've heard this **** before.
Steve

Calypso Red 1992 525i with 200K miles

1991 735i - Sold
1992 525i - Sold
1995 325is - Sold
2000 528i - Sold

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  #8  
Old 03-14-2013, 04:56 PM
Gehrke33 Gehrke33 is offline
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i'll let you know, thanks
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  #9  
Old 03-15-2013, 07:18 PM
Gehrke33 Gehrke33 is offline
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Location: Michigan
 
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Mein Auto: 94 bmw 525i
I put a new computer in the car and still no start, is there something I am missing or donthibg else I should try. The dme came out of a 95 325i, it's a red label and the numbers match. It was a running car that was rolled. Any suggestions?
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  #10  
Old 03-15-2013, 07:38 PM
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BMR_LVR BMR_LVR is offline
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Location: Asheboro, NC
 
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Mein Auto: 1992 525i
Give some history on the no start situation.

What have you checked and how did you check it?

Most common causes are bad CPS, fp fuse, fp relay, fp, main relay.
__________________
Most problems are usually something simple !

Quote:
Originally Posted by noego View Post
It's Deja Poo - as in, I've heard this **** before.
Steve

Calypso Red 1992 525i with 200K miles

1991 735i - Sold
1992 525i - Sold
1995 325is - Sold
2000 528i - Sold

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  #11  
Old 03-15-2013, 08:13 PM
BMR_LVR's Avatar
BMR_LVR BMR_LVR is offline
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Location: Asheboro, NC
 
Join Date: Dec 2008
Posts: 5,264
Mein Auto: 1992 525i
Do you have the Bentley manual? It has a very good trouble shooting guide. Here is a searchable version.
__________________
Most problems are usually something simple !

Quote:
Originally Posted by noego View Post
It's Deja Poo - as in, I've heard this **** before.
Steve

Calypso Red 1992 525i with 200K miles

1991 735i - Sold
1992 525i - Sold
1995 325is - Sold
2000 528i - Sold

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  #12  
Old 03-16-2013, 09:10 AM
Gehrke33 Gehrke33 is offline
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Location: Michigan
 
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no i dont have a bently manual, i guess i should get one.
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  #13  
Old 03-16-2013, 09:13 AM
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BMR_LVR BMR_LVR is offline
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Location: Asheboro, NC
 
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Quote:
Originally Posted by Gehrke33 View Post
no i dont have a bently manual, i guess i should get one.
Click on the link (the word "here") in my post above and you can download a searchable version.
__________________
Most problems are usually something simple !

Quote:
Originally Posted by noego View Post
It's Deja Poo - as in, I've heard this **** before.
Steve

Calypso Red 1992 525i with 200K miles

1991 735i - Sold
1992 525i - Sold
1995 325is - Sold
2000 528i - Sold

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  #14  
Old 03-16-2013, 09:49 AM
Gehrke33 Gehrke33 is offline
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Great, thanks
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  #15  
Old 03-17-2013, 09:27 PM
Gehrke33 Gehrke33 is offline
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Location: Michigan
 
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Mein Auto: 94 bmw 525i
i bought the car about 2 weeks ago and was told it had a bad fuel pump but upon further investigation i found the fuel pump was fine so i started doing some trouble shooting. I dont have a lot of experience with the e34 my other bmw's were 87's and didnt have many problems. I am a mechanic but decided to give it to a shop because i thought it would be easier to just have sombody else trouble shoot it. the shop told me it had a bad dme so i got a used one out of a running 95 325i. It is a red label with matching numbers and works fine but the shop hooked it up said nothing changed. Still doing the same thing, the shop is telling me i need the chip out of my old computer to put in the replacement? Dont know if thats true, I am not really sure were to go from here. I have checked the fuel pump and it works and is giving proper fuel pressure, I checked the fuse and there is no power at the fuse, I can jumper the relay and the fuel pump kicks on but not when i turn the key on. The relay is good but i bought a new one anyway and no go still. The coils have correct voltage and i have spark but the injectors are not working, dont know if the fuel pressure effects the injectors. i have not checked the CPS but the shop didnt have any codes for the CPS. I havent replaced the CPS but i am considering doing it anyways. It will fire on starting fluid but i am really stumped here, any ideas?
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  #16  
Old 03-18-2013, 06:14 AM
drew528i drew528i is offline
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Not shure if bmw has inerta safety swich but shoul have one. if car was rolled then it should have dissabled the fuel pump and could have dissabled the injectors too
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  #17  
Old 03-18-2013, 07:20 AM
BMR_LVR's Avatar
BMR_LVR BMR_LVR is offline
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Location: Asheboro, NC
 
Join Date: Dec 2008
Posts: 5,264
Mein Auto: 1992 525i
Quote:
Originally Posted by Gehrke33 View Post
i bought the car about 2 weeks ago and was told it had a bad fuel pump but upon further investigation i found the fuel pump was fine so i started doing some trouble shooting. I dont have a lot of experience with the e34 my other bmw's were 87's and didnt have many problems. I am a mechanic but decided to give it to a shop because i thought it would be easier to just have sombody else trouble shoot it. the shop told me it had a bad dme so i got a used one out of a running 95 325i. It is a red label with matching numbers and works fine but the shop hooked it up said nothing changed. Still doing the same thing, the shop is telling me i need the chip out of my old computer to put in the replacement? Dont know if thats true, I am not really sure were to go from here. I have checked the fuel pump and it works and is giving proper fuel pressure, I checked the fuse and there is no power at the fuse, I can jumper the relay and the fuel pump kicks on but not when i turn the key on. The relay is good but i bought a new one anyway and no go still. The coils have correct voltage and i have spark but the injectors are not working, dont know if the fuel pressure effects the injectors. i have not checked the CPS but the shop didnt have any codes for the CPS. I havent replaced the CPS but i am considering doing it anyways. It will fire on starting fluid but i am really stumped here, any ideas?
You do not have to change the chip from the old red label 413 DME to the "new" red label 413 DME unless you had a performance chip in there. It will run fine with the stock tune of the "new" DME.

Don't forget to check your main/DME relay. The main/DME relay supplies power to the FP fuse. If the FP fuse it not getting power, this is likely be the problem.

How did you confirm spark?

Check the resistance of the CPS. Note: The Bentley had a misprint on the readings. It should be 540 +/- 10%, NOT 1280 as listed.

You say the engine will fire with starting fluid. Does it run (albeit you should only run it for a few seconds) or just cough and act like it is trying to fire? You can actually keep a car running on the starting fluid if you continue to squirt it in there, but again, you should not run it for more than a few seconds. If you can keep the car running on starting fluid, then you have ruled out a problem with spark and it is purely a fuel delivery problem.

Your situation sounds a lot like this one: http://www.bimmerfest.com/forums/sho...d.php?t=678449

If you replaced (or disconnected) the fuel pump, make sure that you didn't accidentally get the fuel lines crossed.

Keep plugging away at this and you will get it sorted out. I suspect the main/DME relay most.

Let us know how it turns out.
__________________
Most problems are usually something simple !

Quote:
Originally Posted by noego View Post
It's Deja Poo - as in, I've heard this **** before.
Steve

Calypso Red 1992 525i with 200K miles

1991 735i - Sold
1992 525i - Sold
1995 325is - Sold
2000 528i - Sold

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  #18  
Old 03-18-2013, 01:38 PM
Gehrke33 Gehrke33 is offline
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Location: Michigan
 
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Mein Auto: 94 bmw 525i
i just got my car back from the shop and tested my cps, the meter is giving me no reading through the cps. I believe i am testing it right, im testing the resistance between proings 1 and 2 and my meter is just reading an open circuit. I already ordered a new cps should be here today still. let me know if you have any thoughts about not getting any reading through the cps, thanks
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  #19  
Old 03-18-2013, 01:48 PM
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BMR_LVR BMR_LVR is offline
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Location: Asheboro, NC
 
Join Date: Dec 2008
Posts: 5,264
Mein Auto: 1992 525i
Quote:
Originally Posted by Gehrke33 View Post
i just got my car back from the shop and tested my cps, the meter is giving me no reading through the cps. I believe i am testing it right, im testing the resistance between proings 1 and 2 and my meter is just reading an open circuit. I already ordered a new cps should be here today still. let me know if you have any thoughts about not getting any reading through the cps, thanks
It sounds like you tested it properly. An open circuit would indicate a failed CPS. Didn't your mechanic check this for you? Did he give you a non-running car back? Let us know how it goes with the new CPS.

Keep us updated
__________________
Most problems are usually something simple !

Quote:
Originally Posted by noego View Post
It's Deja Poo - as in, I've heard this **** before.
Steve

Calypso Red 1992 525i with 200K miles

1991 735i - Sold
1992 525i - Sold
1995 325is - Sold
2000 528i - Sold

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  #20  
Old 03-18-2013, 02:11 PM
Gehrke33 Gehrke33 is offline
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Location: Michigan
 
Join Date: Mar 2013
Posts: 22
Mein Auto: 94 bmw 525i
the mechanic did not test the cps he was hung up on it being a bad dme and said i had to change the chips, it wasnt optional so i just went and got my car back. I am using a red label out of a 95 325i and he said they werent compatable. his diagnosis was a bad dme and the one i got him was not the right one so he wanted me to get another one. i would rather do it myself and not deal with mechanics ego's.
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  #21  
Old 03-18-2013, 02:24 PM
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BMR_LVR BMR_LVR is offline
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Location: Asheboro, NC
 
Join Date: Dec 2008
Posts: 5,264
Mein Auto: 1992 525i
Quote:
Originally Posted by Gehrke33 View Post
the mechanic did not test the cps he was hung up on it being a bad dme and said i had to change the chips, it wasnt optional so i just went and got my car back. I am using a red label out of a 95 325i and he said they werent compatable. his diagnosis was a bad dme and the one i got him was not the right one so he wanted me to get another one. i would rather do it myself and not deal with mechanics ego's.
I agree completely with you. If your car had the red label 413 DME in it initially, then another red label 413 DME will work without any problem (assuming of course that the second DME is good, but as you said, you got it from a running car).

I think you are on the right track with the CPS. It is a VERY common failure item and one of the top two or three reasons for no-starts on our beloved E34s.
__________________
Most problems are usually something simple !

Quote:
Originally Posted by noego View Post
It's Deja Poo - as in, I've heard this **** before.
Steve

Calypso Red 1992 525i with 200K miles

1991 735i - Sold
1992 525i - Sold
1995 325is - Sold
2000 528i - Sold

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  #22  
Old 03-18-2013, 05:49 PM
Gehrke33 Gehrke33 is offline
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Location: Michigan
 
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Mein Auto: 94 bmw 525i
changed the cps AND IT RUNS!!! runs really rough though almost cant keep it running. if you get it over 2000 rpms it smooths out but it is really difficult to keep running at low rpms, almost no throttle response. any ideas?
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  #23  
Old 03-18-2013, 06:01 PM
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BMR_LVR BMR_LVR is offline
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Location: Asheboro, NC
 
Join Date: Dec 2008
Posts: 5,264
Mein Auto: 1992 525i
Quote:
Originally Posted by Gehrke33 View Post
changed the cps AND IT RUNS!!! runs really rough though almost cant keep it running. if you get it over 2000 rpms it smooths out but it is really difficult to keep running at low rpms, almost no throttle response. any ideas?
Hmmm ..... not sure.

I would do the stomp test to see if there are any error codes.

Have you disconnected the throttle position sensor during this problem? Have you disconnected anything else? Double check your electrical connections.

You can try putting the old DME in there as well.

Keep at it. I believe you will get this figured out.
__________________
Most problems are usually something simple !

Quote:
Originally Posted by noego View Post
It's Deja Poo - as in, I've heard this **** before.
Steve

Calypso Red 1992 525i with 200K miles

1991 735i - Sold
1992 525i - Sold
1995 325is - Sold
2000 528i - Sold

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  #24  
Old 03-18-2013, 07:57 PM
Gehrke33 Gehrke33 is offline
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Location: Michigan
 
Join Date: Mar 2013
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Mein Auto: 94 bmw 525i
FINALLY!! i got it running right, i took it to the gas station and put fresh gas in it and it runs like a top. still surges at idle a little bit but i think its just the TPS, no biggie. thanks for all your help, i really appreciate it. Turns out it was just a Crank Position Sensor and some fresh gas after all. THANKS AGAIN
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  #25  
Old 03-18-2013, 08:01 PM
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DanM5 DanM5 is offline
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Location: Perth, WA
 
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Quote:
Originally Posted by Gehrke33 View Post
FINALLY!! i got it running right, i took it to the gas station and put fresh gas in it and it runs like a top. still surges at idle a little bit but i think its just the TPS, no biggie. thanks for all your help, i really appreciate it. Turns out it was just a Crank Position Sensor and some fresh gas after all. THANKS AGAIN
^^^
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Last edited by DanM5; 03-18-2013 at 08:24 PM.
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