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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > Z Series > E36/7 Z3 (1996-2002)

E36/7 Z3 (1996-2002)
E36/7 Z3 Roadster, Z3 coupe, Z3 M Roadster and Z3 M Coupe talk with our gurus here.

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  #1  
Old 10-16-2012, 02:58 PM
jwrape jwrape is offline
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Location: Monroe, GA
 
Join Date: Mar 2012
Posts: 50
Mein Auto: 96 Z3M (M S52 conversion)
Z3 Will start sometimes and spin over others

I have a 96 Z3 with a transplanted 98' M3 S52 in it.

Ever since I have owned it, it has always taken 3 times to crank. Basically, turn the key and spin the engine, turn it off, turn on and spin, turn off and then turn it on again and it starts and runs perfectly.

Just recently it has been taking doing the on/off on/off on/off switching for as many as 20+ times before it starts and once again runs perfectly. It almost seems like it may never run and then when you've almost given up it starts.

Troubleshooting:
I have replaced the fuel pump (had a bad Gauge sending unit anyways)
Replaced the fuel filter
Replaced the Crank Position Sensor

I have then tried to reset the computer. I unplugged the negative on the batteyr and turned on the flashers to drain it.
After this it started on the first try for 3 times and then it went back to not wanting to start.

It seems to be getting worse to where it almost won't start.

Could this be the DME or a bad EWS?
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  #2  
Old 10-17-2012, 12:27 PM
jwrape jwrape is offline
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Location: Monroe, GA
 
Join Date: Mar 2012
Posts: 50
Mein Auto: 96 Z3M (M S52 conversion)
Ok, I was able to reproduce the non-start issue with my Volt meter on the Fuel Injectors and it is getting Voltage to the injectors.

So it seems that the last thing is that I have no spark.

It DOES seem like a ON or OFF issue. Meaning that when it starts it starts perfectly, when it doesn't it just spins over.

It doesn't spin and then gradually start. Just a cycle of the key and it starts like something turned on.
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  #3  
Old 10-17-2012, 03:50 PM
wifesauto wifesauto is offline
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Location: nj
 
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Posts: 337
Mein Auto: sloporsche
you are getting an electrical signal to the injectors........are you getting fuel to them ? check for a signal from the crankshaft sensor
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  #4  
Old 10-18-2012, 12:57 PM
jwrape jwrape is offline
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Location: Monroe, GA
 
Join Date: Mar 2012
Posts: 50
Mein Auto: 96 Z3M (M S52 conversion)
Quote:
Originally Posted by wifesauto View Post
you are getting an electrical signal to the injectors........are you getting fuel to them ? check for a signal from the crankshaft sensor
Yes, I am getting signal to the injectors. I varified with a Volt meter and the Crank position was replaced this week. Just not getting fire
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  #5  
Old 10-18-2012, 02:51 PM
wifesauto wifesauto is offline
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Location: nj
 
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Mein Auto: sloporsche
the trick is to find out what you are not getting while cranking [no spark or no fuel or both] does EVERYTHING electrical work ok? [no wipers sometimes/radio sometimes]?i ask because if you have electrical bugs sometimes it makes your ignition switch suspect. did you confirm that you are getting fuel while cranking no start ?did you confirm spark [at plugs] during cranking no start?
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  #6  
Old 10-23-2012, 04:37 AM
jwrape jwrape is offline
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Location: Monroe, GA
 
Join Date: Mar 2012
Posts: 50
Mein Auto: 96 Z3M (M S52 conversion)
Quote:
Originally Posted by wifesauto View Post
the trick is to find out what you are not getting while cranking [no spark or no fuel or both] does EVERYTHING electrical work ok? [no wipers sometimes/radio sometimes]?i ask because if you have electrical bugs sometimes it makes your ignition switch suspect. did you confirm that you are getting fuel while cranking no start ?did you confirm spark [at plugs] during cranking no start?
Getting signal to the fuel injectors as well as fuel pressure. It's totally a NO SPARK issue.

I need to figure out the circuit that provides the spark.
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  #7  
Old 10-30-2012, 05:11 AM
jwrape jwrape is offline
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Location: Monroe, GA
 
Join Date: Mar 2012
Posts: 50
Mein Auto: 96 Z3M (M S52 conversion)
I found it, I figured it out.

I found a relay beside my DME that had some corrosion on it. I swapped it out with the main relay (same kind of relay) and the car started. I am ordering new relays to replace permenantly


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96' Z3 M Conversion. 98' M3 S52 tranplanted into the little beast

Last edited by jwrape; 10-30-2012 at 05:14 AM.
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  #8  
Old 10-30-2012, 08:42 AM
wifesauto wifesauto is offline
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Location: nj
 
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Mein Auto: sloporsche
good for you and thank you for the report back
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  #9  
Old 11-01-2012, 10:37 AM
lovemyz3 lovemyz3 is offline
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Location: USA
 
Join Date: Sep 2012
Posts: 38
Mein Auto: Z3
Awesome fix. Well done figuring that out. I have been there done that on things.

Well done!
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  #10  
Old 11-08-2012, 08:14 AM
Vanne Vanne is offline
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Location: Christchurch
 
Join Date: Apr 2011
Posts: 38
Mein Auto: Z3
where abouts is this relay, sounds exactly like mine...
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  #11  
Old 11-08-2012, 08:16 AM
jwrape jwrape is offline
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Location: Monroe, GA
 
Join Date: Mar 2012
Posts: 50
Mein Auto: 96 Z3M (M S52 conversion)
Quote:
Originally Posted by Vanne View Post
where abouts is this relay, sounds exactly like mine...
Mine is located right beside my battery, BUT since my car is a S52 swap I am not sure about location on a factory car.
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96' Z3 M Conversion. 98' M3 S52 tranplanted into the little beast
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  #12  
Old 08-19-2013, 10:33 AM
vonzai vonzai is offline
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Location: Phoenix, AZ
 
Join Date: Aug 2013
Posts: 15
Mein Auto: 1997 Z3
cranks then spins

Hi Everyone...

Mine does the same thing replaced relay but no go same problem I found a youtube video that does exactly my car does same car same engine difference is mine does not run here it is thanks in advance
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