740 only fires on 1 cylinder

fonzie · Jun 6th, 2010, 08:05

I have a 740 with a b230f over time it has been slowly decreasing in the number of cylinders it would start on. First it was 3 and then it dropped to 2, around that point the air&fuel computer went and it wasn't activating the fuel pump. A new air&fuel computer was bought and it fixed the fuel pump problem but not the starting problem. It would start on 2 or 3 cylinders and after a bit of a warm up and a few revs the others would pick up. However now following it's previous course it is now only firing on 1 cylinder. It has new spark plugs and there is plenty of spark. It is also injecting the fuel because you can smell it when you remove the spark plug. I'm hoping someone can help me cause I really do love the car :P oh and on the odd occasion it will start perfectly on all cylinders.

Is it worth loooking into replacing the ignition computer?

Jim760 · Jun 6th, 2010, 19:41

only if your sure its sparking on all 4 cylinders, the plugs are showing no signs of any abnormalities, then i would think you should try an alternate ecu, if there is no change, then id say its time to go through all the sensors..

Jun 6th, 2010, 08:05	#1
fonzie New Member Last Online: Jun 23rd, 2010 05:31 Join Date: Jun 2009 Location: Sydney	740 only fires on 1 cylinder I have a 740 with a b230f over time it has been slowly decreasing in the number of cylinders it would start on. First it was 3 and then it dropped to 2, around that point the air&fuel computer went and it wasn't activating the fuel pump. A new air&fuel computer was bought and it fixed the fuel pump problem but not the starting problem. It would start on 2 or 3 cylinders and after a bit of a warm up and a few revs the others would pick up. However now following it's previous course it is now only firing on 1 cylinder. It has new spark plugs and there is plenty of spark. It is also injecting the fuel because you can smell it when you remove the spark plug. I'm hoping someone can help me cause I really do love the car :P oh and on the odd occasion it will start perfectly on all cylinders. Is it worth loooking into replacing the ignition computer?

Jun 6th, 2010, 19:41	#2
Jim760 Mr G Last Online: Jun 12th, 2020 19:11 Join Date: May 2007 Location: north yorkshire	only if your sure its sparking on all 4 cylinders, the plugs are showing no signs of any abnormalities, then i would think you should try an alternate ecu, if there is no change, then id say its time to go through all the sensors.. __________________ will the jimousine ride again? previous models 940 TDI360 GLT 480 ES 740 GLE 940 SE 760 Executive 940 GL 850 GL 760 TIC V70 Torslanda

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