m20 hot starting issue
Moderator: martauto
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initial_g
- E30 Zone Moderator

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My m20b25 is haveing starting issues when warm. Ive had the inlet off and replaced all the gaskets with new ones cleaned up the tb and the maf sensor, it starts perfectly when cold but when warm... even after it just idleing for 5 mins from cold .. switch it of then it wont restart :/ any ideas? Cheers g[/list]
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Morat
- E30 Zone Team Member

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How is your fuel consumption?
E30 Touring 0.35 cD - more slippery than prison soap 

Praise the Lard... and pass the dripping!

Praise the Lard... and pass the dripping!
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jimbom30cab
- Tech 1 freak
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Is it worth testing the blue temp sensor for resistance readings? The wiki has a guide iirc.
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mark_i
- E30 Zone Regular

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main relay (white) and ECU relay (orange) can cause the warm starting issue
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initial_g
- E30 Zone Moderator

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Ive not driven it yet so not sure on fuel consumption. Its not been run in 2 years....
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Grrrmachine
- E30 Zone Wiki / Team Member

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If it's been sat for two years then the ECU won't have any of its idle settings sorted and is probably massively overfuelling.
I posted this elsewhere yesterday:
I posted this elsewhere yesterday:
You should still test the blue temp sensor at the ECU plug though, to make sure the signal's getting through.Grrrmachine wrote:After resetting the ECU, FROM COLD start the car up and let it idle for ten minutes. Then turn it off, restart, and take it for a very aggressive drive.
'89 325i Touring | Touring Resto Thread | In-Dash Screen install
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initial_g
- E30 Zone Moderator

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Cheers guys ill try your pointers and see how it goes.... I have had the ecu out when I had ther dash out..
