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323i engine cuts out when warm / revving - ignition problem?

Posted: Sat Jul 01, 2023 9:52 pm
by Kent Thirley
Hi all,
I have owned my E21 323i (1981) since 2015. Since ownership it sometimes hesitates to start when warm / been running. It helps to give a little throttle to make it start.
It also cuts out on tick over when at full operating temperature when revved hard. It will start again with a little throttle.
Driving today, I came off of a dual carriageway after cruising at 70mph and as I lowered my speed the engine cut out as though I had turned off the ignition. Pulled up where safe, tuned key to off and then start and the engine started again with a little throttle. Continued the drive home for another 10 minutes and was fine. Tick over / idle is a little high, over 1000 rpm.
Any ideas?
Thanks
Kent

Re: 323i engine cuts out when warm / revving - ignition problem?

Posted: Mon Jul 03, 2023 9:51 am
by Kent Thirley
Ignition control module?
Anyone else found this acting up / causing a loss of ignition and resolved engine / ignition dying by replacing the module?

Re: 323i engine cuts out when warm / revving - ignition problem?

Posted: Mon Jul 03, 2023 10:39 am
by Jeroen
Not thinking of a defective ignition contol module, you can't fix these by pressing the throttle

Cold start and cold idle is ok? Works well during warmup?

I am thinking of an ignition timing issue due to a vacuum leak.

Does the exhaust smell of excessive fuel after a warm restart? Thinking about a leaking fuel injector as well.

Re: 323i engine cuts out when warm / revving - ignition problem?

Posted: Mon Jul 03, 2023 6:26 pm
by Kent Thirley
Thanks Jeroen,
Many thanks for your input / suggestions.
Will report further.
K

Re: 323i engine cuts out when warm / revving - ignition problem?

Posted: Sat Jul 08, 2023 6:27 pm
by Kent Thirley
Update: Found the fuel pump relay to be faulty when tested.
Current relay fitted is 1363827.2 SHO SK6460. New BMW part number possibly 12631277245.
Will hopefully place an order for a replacement after the weekend.