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E34 (1989 - 1995)

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  #1  
Old 05-11-2013, 06:23 PM
Bearth02 Bearth02 is offline
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Mein Auto: 1994 BMW 530i
Starting problems

Having trouble w my 1994 bmw 530i not starting. Iv changed plugs, knock sensor, coils, fuel sending unit and changed out dme computer. Cranks over like it wants 2 start but wont fire. I did a 4 point ground to check spark and has plenty. Help

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  #2  
Old 05-11-2013, 07:35 PM
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BMR_LVR BMR_LVR is offline
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Location: Asheboro, NC
 
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Welcome to the Fest.

Short answer, since you have spark, you most likely have a fuel delivery problem. Check the fuel pump fuse, fuel pump relay, fuel filter and fuel pump, in that order.

The Bentley manual will show how to check all of these. Here is a link to the manual.

A quick way to confirm it's fuel delivery is get some starting fluid. Whlile someone is trying to crank the car, give about a 2-3 squirt of the starting fluid into the intake. If it cranks and runs, then you have confirmed it is a fuel delivery problem and you can proceed to check the above. However, do not continue to run the car on the starting fluid. It can be hard on the engine. This is just a diagnostic tool in your situation.

Good luck.

Again, welcome.
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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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  #3  
Old 05-11-2013, 07:41 PM
Bearth02 Bearth02 is offline
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Re: Starting problems

I have checked the fuel pressure 2 the rail and everything is great. Any other ideas of why it wont start?

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  #4  
Old 05-11-2013, 07:47 PM
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BMR_LVR BMR_LVR is offline
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Location: Asheboro, NC
 
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Well, since you have spark (sorry, but I don't know what the 4 point ground test is) and you have fuel, then the only other two common things that can cause a no-start are air and compression. You usually don't lose either quickly.

The most common cause of no-spark is the CPS, but if you have spark, then it is most likely working properly.

Perhaps you need to give us a little info into exactly how the no-start occurred and what you actually did to test the components.

Collectively, we should be able to get you up and running, but we will need a little more information.
__________________
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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  #5  
Old 05-11-2013, 07:57 PM
Bearth02 Bearth02 is offline
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Location: Wisconsin
 
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Mein Auto: 1994 BMW 530i
Re: Starting problems

I bought the car non-running and was told it was the fuel pump and when i tested the pump had no power to the pump. I fixed that problem. I used a compression tester to test

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  #6  
Old 05-11-2013, 08:03 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
Quote:
Originally Posted by Bearth02 View Post
I bought the car non-running and was told it was the fuel pump and when i tested the pump had no power to the pump. I fixed that problem. I used a compression tester to test

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... your compression? I assume you got good numbers across all 8 cylinders?

You fixed power to the pump. Did you confirm that the pump runs well?

Not trying to nit pick, but a synopsis of your problems and what you have done would help.

Also, make sure and do the stomp test. The problem may be revealed with that test.
__________________
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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  #7  
Old 05-11-2013, 08:08 PM
Bearth02 Bearth02 is offline
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Location: Wisconsin
 
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Re: Starting problems

All cylinders were around 125psi which is a lil low from what it should b at. Whats the stomp test?

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  #8  
Old 05-11-2013, 08:13 PM
Bearth02 Bearth02 is offline
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Re: Starting problems

Alrite my buddy knows the stomp test and no codes read across dash. We have also relpaced the throttle position sensor

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  #9  
Old 05-11-2013, 08:15 PM
BMR_LVR's Avatar
BMR_LVR BMR_LVR is offline
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Location: Asheboro, NC
 
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Here's a link.

http://www.bimmerfest.com/forums/sho...65#post5936965

It's in the sticky at the top of the page titled "Mechanical things you need to know about your E34".

Also, if you don't have it, you should get the Bentley manual. It sounds like you are mechanically savvy and do a lot of DIY. It's the best repair manual that's commonly available. There are a few mistakes in there, but it's great to guide you.
__________________
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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  #10  
Old 05-11-2013, 08:17 PM
BMR_LVR's Avatar
BMR_LVR BMR_LVR is offline
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Location: Asheboro, NC
 
Join Date: Dec 2008
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Mein Auto: 1992 525i
Quote:
Originally Posted by Bearth02 View Post
Alrite my buddy knows the stomp test and no codes read across dash. We have also relpaced the throttle position sensor

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Does he understand that error codes don't read across the dash? The CEL will flash in a certain sequence with 1444 meaning no stored error codes.
__________________
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 05-11-2013, 08:27 PM
Bearth02 Bearth02 is offline
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Location: Wisconsin
 
Join Date: Apr 2013
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Mein Auto: 1994 BMW 530i
Re: Starting problems

Yes hes familiar w the stop test on a 3 series. It works on his but not mine. Is there sympoms of y it wouldnt work in my car. I have already bought the bmw 5 series service manual by bentley publishers

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  #12  
Old 05-11-2013, 08:44 PM
BMR_LVR's Avatar
BMR_LVR BMR_LVR is offline
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Location: Asheboro, NC
 
Join Date: Dec 2008
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Mein Auto: 1992 525i
The only reason I can think of is if the CEL bulb is burnt out or if the DME is bad, but you said that you replaced it, so IDK.

There is a possibility that your car has EWS I (depending on date of manufacture - I can't remember if all 94s had it) which is a drive away protection feature and there could be a problem with it. It can cause the engine to not fire and run, but usually it does not allow spark or the fuel pump to energize when it is activated. I am a lot more familiar with the EWS II and how to bypass it, but not so sure on the EWS I.

Engine coolant temp sensors and air temp sensors can cause no-starts, but are less common.

Getting ready to go to bed now here on the east coast. Perhaps a good night's rest will give you a fresh perspective.

Good luck. Hope you get it sorted soon.
__________________
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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  #13  
Old 05-11-2013, 08:57 PM
Bearth02 Bearth02 is offline
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Location: Wisconsin
 
Join Date: Apr 2013
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Mein Auto: 1994 BMW 530i
Re: Starting problems

The car was manufactured 01/94. How can i find out if i have the ews1 or ews2

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  #14  
Old 05-11-2013, 09:26 PM
Bimmerfan84 Bimmerfan84 is offline
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If this is an automatic you should also check the shifter and the electronic switch on the side of the transmission. Car won't start unless it thinks it's in park or neutral.
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  #15  
Old 05-11-2013, 11:23 PM
PlasmaE34 PlasmaE34 is offline
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Quote:
Originally Posted by Bearth02 View Post
All cylinders were around 125psi which is a lil low from what it should b at. Whats the stomp test?

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That's low compression. You might not start with that. Compression should be 152psi.
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  #16  
Old 05-11-2013, 11:29 PM
PlasmaE34 PlasmaE34 is offline
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Quote:
Originally Posted by Bearth02 View Post
Having trouble w my 1994 bmw 530i not starting. Iv changed plugs, knock sensor, coils, fuel sending unit and changed out dme computer. Cranks over like it wants 2 start but wont fire. I did a 4 point ground to check spark and has plenty. Help

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If your car cranks, then EWS of any flavour is not the issue.

EWS cuts off the starter if damaged. EWS1 stops at the starter. Its a single stage affair. Bypass the EWS to the starter and spark and fuel are automatically restored. EWS2 also has a DME that needs a code from the immobiliser unit. It is a 2 stage affair. Bypassing to the starter alone does not revive the dme here, which means there's still no spark and fuel. The DME has to be jimmied with a delete chip or replaced with a non-ews2 dme for the same engine.

Quote:
Originally Posted by Bearth02 View Post
Having trouble w my 1994 bmw 530i not starting. Iv changed plugs, knock sensor, coils, fuel sending unit and changed out dme computer. Cranks over like it wants 2 start but wont fire.

Sounds like it nearly wants to catch but can't. This is either low compression, or a bad dme that has screwed the ignition timing just enough to prevent a start. A bad dme might not give you an error code on the stomp test. Reoil the cylinders to restore compression, unplug the coolant sensor, then try.

If your engine starts, then replace the coolant sensor. If it still doesn't, and you confirm spark and fuel again, then its the dme for sure.

The coolant sensor is much more likely to be the culprit. And you have already changed the DME...

Last edited by PlasmaE34; 05-12-2013 at 12:01 AM.
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