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my 325i cab wont start
Posted: Thu Mar 31, 2011 11:32 pm
by jonnyboy
hi, ive got a 1989 325i m20 i went to the shop on my dinner beak, it run a little lumpy for the first 10 sec then was ok but when i went to drive home from work it wouldnt start.
ive had a look and ive got no sparks can anyone help me on what to look for and how to test it. cheers
andy
Re: my 325i cab wont start
Posted: Thu Mar 31, 2011 11:35 pm
by Rav335uk
Does it have an immobiliser fitted?
Re: my 325i cab wont start
Posted: Fri Apr 01, 2011 1:40 am
by jonnyboy
Rav335uk wrote:Does it have an immobiliser fitted?
no am sure its as not got one. it turns over but there no spark at all.
Re: my 325i cab wont start
Posted: Fri Apr 01, 2011 2:03 am
by GovR
I had the same problem (yes I know its not the same car but could be similar?) on a peugeot 306 - turned out to be a cracked and rusty Fuel pump relay/module = no fuel no spark.
Check your fuel pump relay + crank angle sensor.
Re: my 325i cab wont start
Posted: Sat Apr 02, 2011 1:32 am
by jonnyboy
does anyone knw where the fuel relay is and i will order a new crank sensor tomo. unless theres a way of testing it.cheers
Re: my 325i cab wont start
Posted: Sat Apr 02, 2011 2:30 am
by Barx325i
Earth strap/battery neg etc, have you been giving it some pain with the recent weather?
Re: my 325i cab wont start
Posted: Sat Apr 02, 2011 9:12 am
by jonnyboy
Barx325i wrote:Earth strap/battery neg etc, have you been giving it some pain with the recent weather?
no its been fine all over winter.
Re: my 325i cab wont start
Posted: Sat Apr 02, 2011 6:06 pm
by jonnyboy
iv tried all of the above and still nothin but please please help !!
Re: my 325i cab wont start
Posted: Sat Apr 02, 2011 8:16 pm
by jonnyboy
HI, ive changed everything i can thnik of. am now thinking it could be a bad earth could anyone tell me where all the earths are. plzs its getting dark.
Re: my 325i cab wont start
Posted: Sat Apr 02, 2011 8:57 pm
by Gristo
you might have problem with ECU..my 327 has similar problem, and the problem is somewhere in ECU, sometimes it's working,sometimes it's not... I had to push the main plug of ECU really hard to its socket..after that it was working for a while.. then I swaped the ECU from my friends 325 and had no problems after that.
Re: my 325i cab wont start
Posted: Sun Apr 03, 2011 1:47 pm
by jonnyboy
Gristo wrote:you might have problem with ECU..my 327 has similar problem, and the problem is somewhere in ECU, sometimes it's working,sometimes it's not... I had to push the main plug of ECU really hard to its socket..after that it was working for a while.. then I swaped the ECU from my friends 325 and had no problems after that.
ive swap the ecu and sill note there.
Re: my 325i cab wont start
Posted: Sun Apr 03, 2011 2:38 pm
by jonnyboy
willnz wrote:Just to make sure, when you crank the motor, the fuel pump runs? Yes/no??
(assuming it does) Check the coil primary and secondary resistances.
Check primary resistance between terminals 1 and 15, (disconnect the wiring from the coil), you should get 0.5 ohms.
no its just reading 1
Check secondary resistance between terminal 15 and the king post (centre), you should get 5000 ohms.
its reads about 1053 ohms
Or swap it for a known good coil and try.
ive tryed a new one its sill the same.
Check that your rotor arm is intact. Measure the resistance between the centre and outer contacts, you should read 1000 +/- 20% ohms.
Check the distributor cap for cracks and that the centre carbon brush is ok and spring is working. Measure the resistance from the outer centre post to the carbon brush, you should get ) ohms.
Check the resistance of the HT lead from the coil, you should read around 2000 ohms cap to cap.
cheers for your help ive got fuel and resistance between terminals 1 and 15 is just readin 1 and secondary resistance between terminal 15 and the king post only reads 1053 and coil ht lead to cap reads 1 .
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Re: my 325i cab wont start
Posted: Sun Apr 03, 2011 2:57 pm
by jonnyboy
am well lost now some said about it could be the obc causing it am really stuck.
Re: my 325i cab wont start
Posted: Wed Apr 06, 2011 12:58 am
by jonnyboy
as anyone got any idea why i have really poor ohms coming to and from my coil? am running out of ideas
Re: my 325i cab wont start
Posted: Tue Apr 12, 2011 3:38 pm
by srmalek
willnz wrote:Just to make sure, when you crank the motor, the fuel pump runs? Yes/no??
(assuming it does) Check the coil primary and secondary resistances.
Check primary resistance between terminals 1 and 15, (disconnect the wiring from the coil), you should get 0.5 ohms.
Check secondary resistance between terminal 15 and the king post (centre), you should get 5000 ohms.
Or swap it for a known good coil and try.
Check that your rotor arm is intact. Measure the resistance
between the centre and outer contacts, you should read 1000 +/- 20% ohms.
Check the distributor cap for cracks and that the centre carbon
brush is ok and spring is working. Measure the resistance from
the outer centre post to the carbon brush, you should get ) ohms.
Sorry to hijack the topic, but can I test this method for my 323i e30 with m20 engine year 1985
Check the resistance of the HT lead from the coil, you should read around 2000 ohms cap to cap.
Re: my 325i cab wont start
Posted: Tue Apr 12, 2011 3:39 pm
by srmalek
Ops my question went into the quote box,
Re: my 325i cab wont start
Posted: Fri Apr 15, 2011 2:43 pm
by m0gsia
Some multimeters will read 1 on the resistance measurment when the reading is out of bounds.
Is it reading 1 when the probes aren't touching anything? Does it read 0 when the probes are touching each other?
Re: my 325i cab wont start
Posted: Fri Apr 15, 2011 2:52 pm
by Taz
OBC controle module box check it if your car has a obc
Re: my 325i cab wont start
Posted: Fri Apr 15, 2011 3:38 pm
by mr_dink
If you mulimeter is saying -1 on the display this normally indicates an open circuit, i.e your coil may be faulty.