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E30 M3 (1986-1991) {Euro 86-892.3L: 200hp @ 6750} {1990 2.3L Evo2/Cecotto/Ravaglia: 220/215/215hp @ 6750}
{1991 2.5L Sport Evo: 238 @ 7000} {US -- 88-91 2.3L: 196hp @ 6750, 170tq @ 4750}
Total produced: 5,280 US, ~13,300 Europe/world


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Old Sat, Jan-05-2019, 03:16:22 PM   #1
Concertbuzzer
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Question Rich Running

Hi. Have owned a 1990 m3 since 1993. Vehicle sat for some time and is at independent BMW shop to sort out various problems. They are having problems with the same problem I had over the last few years - the vehicle runs very rich all the time and fouls plugs quickly. The airflow meter and coolant temperature sensor have been checked. Is there anything else to try or any diagnostics available?
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Old Fri, Feb-08-2019, 03:52:21 AM   #2
Concertbuzzer
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Default Re: Rich Running

So after removing the ecu and having it checked by specialist it turns out the problem was caused by a faulty fuel pressure regulator on the fuel rail. (Posted for anyone who might experience a similar problem in the future).
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Old Thu, Mar-21-2019, 02:59:48 PM   #3
nlakind
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Default Re: Rich Running

Def gonna be helpful, I was having the same issue, ran into a few ppl saying it could be the faulty fuel pressure regulator. Mine seemed to be a chip I didn't know was installed in like 1998 from the previous owner that was obviously dead at this point.
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Discussing Rich Running in the E30 M3 (1986-1991) Forum - {Euro 86-892.3L: 200hp @ 6750} {1990 2.3L Evo2/Cecotto/Ravaglia: 220/215/215hp @ 6750}
{1991 2.5L Sport Evo: 238 @ 7000} {US -- 88-91 2.3L: 196hp @ 6750, 170tq @ 4750}
Total produced: 5,280 US, ~13,300 Europe/world at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)