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3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

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Old 03-31-2007, 11:44 PM   #1 (permalink)
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check engine light

well ive notice that my check engine light comes on while i am on a red light,or when i come to a complete stop for like about 5 secs it comes on, and when i accelerated to go it goes off. any ideas i have check everything but i dont know what else to check for.
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Old 03-31-2007, 11:50 PM   #2 (permalink)
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bad alternator?....


when mine went bad..a few of the dash lights would come on when at complete stops....the battery was still getting a little charge, but after a few weeks like this it stopped charging completly....

take your car to anywhere with a volt meter (like checker) and have them test it....I think it should read around 13-14 volts....but I'm not sure...

or it could be the rectifier or regulator...but I just replaced the whole alternator for $150 instead of trying to figure out which part was bad...
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Old 04-01-2007, 12:08 AM   #3 (permalink)
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Originally Posted by yammahamma
bad alternator?....


when mine went bad..a few of the dash lights would come on when at complete stops....the battery was still getting a little charge, but after a few weeks like this it stopped charging completly....

take your car to anywhere with a volt meter (like checker) and have them test it....I think it should read around 13-14 volts....but I'm not sure...

or it could be the rectifier or regulator...but I just replaced the whole alternator for $150 instead of trying to figure out which part was bad...
u think its the alt? i have HIds, 2 10s speakers with 1000WATS amp. the light comes on only when i stop.by the way i am getting code 1222 and 2 days ago i seal all vac leaks, replace my o2 sensor, added a new air filter. and still does it. any ideas?

ps. i also replace my fuel pump
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Old 04-01-2007, 12:12 AM   #4 (permalink)
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^^^ I really don't know much about it....all I know is I had a similar problem and replacing the alt fixed it...besides, testing it is free...so what's there to lose?

maybe someone can give you better help...but that's just my $.02

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Old 04-01-2007, 12:21 AM   #5 (permalink)
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^^^ I really don't know much about it....all I know is I had a similar problem and replacing the alt fixed it...besides, testing it is free...so what's there to lose?

maybe someone can give you better help...but that's just my $.02


thanks for giving me ideas dude. ill have the alt check
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Old 04-01-2007, 12:28 AM   #6 (permalink)
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great lookin' car by the way...

'89 e30 vert, represent!
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Old 04-01-2007, 08:27 AM   #7 (permalink)
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Check your IAT sensor in your AFM. And test your fuel pressure regulator.
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