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M3 wont start!!!

Printed From: Bavarian-Board.co.uk - BMW Owners Discussion Forum
Category: Technical & Model Specific Forums
Forum Name: BMW ///M Power
Forum Discription: Ask your BMW M Power Technical Questions here (M1, M2 hybrids, M3, M5 & M6)
URL: http://www.bavarian-board.co.uk/forum_posts.asp?TID=39329
Printed Date: 14-May-2024 at 13:42


Topic: M3 wont start!!!
Posted By: falkster
Subject: M3 wont start!!!
Date Posted: 05-November-2007 at 22:51

Last Tuesday my wife was about to set off for work and started the car but she stalled it. She couldnt start it again so I went out and tried but no joy.

Later on I called the RAC (not having tools at home) and they came out and said she had flooded it but he couldnt get the plugs out cos he didnt have the tools.

Anyway I got myself the correct plug spanner and removed them, cleaned them and replaced them and still no joy. I did notice a plug lead was faulty so ordered new ones.

Fitting new ones on Sunday I thought would sort it but nope!!! And when turning over it now sounds funny (perculiar not ha ha).

I removed all the plugs to test for spark and thats ok but will be replacing them just incase tomorrow! Its definately getting fuel aswell.

Any ideas please as Im at the end of my tether??

Thanks

Chris



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Z3M Roadster (gone....just...but not forgotten...yet)
E30 M3 (Toy)
Alfa 147 (just gone)
BMW 330d (new work horse)
Daimler Double 6 (no idea yet)


Replies:
Posted By: Lancastrian
Date Posted: 06-November-2007 at 00:04
Originally posted by falkster falkster wrote:

Any ideas please as Im at the end of my tether??

I recognise that feeling 

Could be any one (or more than one) of a number of things, even though you are sure that the spark is OK and it is getting fuel.

As you plan to, I would try new plugs first or thoroughly dry out the existing ones with plumbers blowtorch (or oven bake) .

Other suggestions (in no particular order):

  • flywheel position and/or crank speed sensor(s)
  • water temp sensor (blue one)
  • fuel filter (not enough fuel on demand)
  • main relay (behind water header tank)
  • fuel pump relay (same place)
  • idle control valve (under throttle bodies)
  • airflow meter / inlet air temp sensor
  • ECU connector (bad connection - hold/push/"waggle" connector while starting)
  • ECU (dry solder joints / faulty transistors - as above)
  • Ignition coil
  • HT leads
  • Disi cap / rotor arm
  • atmospheric pressure sensor
  • vacuum / air leaks
  • poor battery (unlikely if it will turnover but will not run at all)
  • Throttle position switch

 



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E30 M3 Project - Specification TBC

Posted By: falkster
Date Posted: 06-November-2007 at 08:27

Well atleast I can cross 2 of the 16 suggestions off!!!

Ive spoken to a guy this morning and he suggested something to do with water temp sensor.

Ill give these plugs a whirl and then see!

Cheers



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Z3M Roadster (gone....just...but not forgotten...yet)
E30 M3 (Toy)
Alfa 147 (just gone)
BMW 330d (new work horse)
Daimler Double 6 (no idea yet)

Posted By: Sporty1
Date Posted: 06-November-2007 at 09:41
The coolant sensor can be tested with a multimeter, should show a reading of approx 2500 ohms with a cold engine, and approx 200 ohms when the engine is hot.

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Sport Evolution Schwarz #043

Posted By: falkster
Date Posted: 06-November-2007 at 11:01

Panic over guys!!!

Replaced plugs and after a good few turns and a lumpy start we have lift off!!!

Glad it was pretty simple but its taken a week of messing about to sort.

Thanks



-------------
Z3M Roadster (gone....just...but not forgotten...yet)
E30 M3 (Toy)
Alfa 147 (just gone)
BMW 330d (new work horse)
Daimler Double 6 (no idea yet)


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