my G40 wont spark

Robin · July 20, 2009, 08:50:33 PM

Nik the loom i have sent you is off a pukka working car, came out of my old G so if that doesn't solve the problem then you have another issue with the car, might be worth checking that there are no broken wires in the loom before changing it back using a multimeter and a haynes wiring diagram and pinning it back from the hall sender connector to the ECU.

goosyganger · July 20, 2009, 11:35:29 PM

scotsjohn how much did you pay for the repair? and what sort of place did you get it done at? I was born ready for bad news lol.

Yeah hopefully the loom will result in it working, otherwise I will start to investigate the ECU and try to find a way of testing it in someone elses G40.

Thanks for all the help boys

Dan · July 24, 2009, 05:56:09 PM

There are two plugs one for the coil, the other for the ignition end stage. They are close to each other. Did you get them mixed up ?

scotsjohn · July 24, 2009, 08:15:18 PM

It was about £250 and that's going back a few years. I got it fixed by the AA who seemingly have a repair facility dedicated to ECU problems. Can't remember addresses/phone nos. but if they still run it (and I reckon it would still be profitable) it shouldn't be too hard to get their whereabouts. Only problem was they couldn't identify the cause of failure.

G40supercharged · July 25, 2009, 01:17:09 AM

Have a look at this thread from Club Polo. There is a transistor in the ECU that drives the coil. This may be broken. If your injectors are working but there is no spark it may be the problem. If injectors not firing either then it is something else. I would check with another G40 ECU first to prove yours is faulty before you start messing about with it though. The fix discussed below cost 17p!

http://www.clubpolo.co.uk/forum/index.php?showtopic=110223&hl=transistor

goosyganger · July 25, 2009, 01:27:04 AM

Hi guys,
Just wanted to give another update. Today I installed the loom that I bought from 'Robin', connected it all up. I went to see if I would get a spark by touching the spark plug in the HT to the head (earth) and there was a spark, then as the second spark hit the engine fired up. I wasnt expecting a result so I didnt bother attaching the downpipe to the manifold. My girlfriend was sitting next to the front of the car in my garage and nearly hit the roof when it fired coz it was so loud! haha. I bought the old loom from someone on here and was obviously ripped off because the loom is far from working! At least its fired up now I can finish the final touches. Thanks for all your advice it was very helpful!

Nik

scotsjohn · July 25, 2009, 08:22:26 PM

Good result.

vwmk3jon · July 26, 2009, 10:11:32 PM

so it was the loom? I think i better check mine before i start buying new parts.

goosyganger · July 27, 2009, 01:12:13 AM

Quote from: vwmk3jon on July 26, 2009, 10:11:32 PM
so it was the loom? I think i better check mine before i start buying new parts.

yeah and it seemed to have sparked up straight away. Pull yours out and test it. Im sure there must be a more suffisticated way of doing it but I jsut used a multimeter to make sure there wasnt anymore then 0.5 resistence and that it bleeped. took me a couple of hours to get through the whole loom. But worth checking. Who knows this may not be the end of my problems lol.