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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 04-12-2007, 06:32 PM   #1 (permalink)
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Idle problems

Check engine light come on at idle
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Old 04-14-2007, 10:27 AM   #2 (permalink)
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Check engine light come on at idle
u know i am having the same problem, but when i accelerated it goes away...just on idel that it comes on
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Old 04-14-2007, 04:32 PM   #3 (permalink)
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Sounds like the MAF. My car did that and that is what it was.
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Old 04-15-2007, 12:01 AM   #4 (permalink)
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Y.M.M. (Year make model)
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Old 04-15-2007, 12:32 PM   #5 (permalink)
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I have a 1990 325
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Old 04-15-2007, 11:01 PM   #6 (permalink)
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Auto or stick?
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Old 04-16-2007, 12:11 AM   #7 (permalink)
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Quote:
Originally Posted by MEDSTUDENT87
Sounds like the MAF. My car did that and that is what it was.
no E30s came with a MAF, but they did come with an AFM
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Old 04-16-2007, 06:01 PM   #8 (permalink)
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Quote:
Originally Posted by gotKRAUT
no E30s came with a MAF, but they did come with an AFM
Odd. I thought the two terms were interchangeable. What's the difference?
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Old 04-17-2007, 12:11 AM   #9 (permalink)
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AFM is an Air Flow Meter, its basically a trap door that opens as air is pulled through thus chaging the measurement for fuel adjustment

MAF is a Mass Air Flow unit... usually a "Hot Wire" which measures by the air esentially cooling the wire and getting its measurement from that resistance/change in frequency....
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Old 04-17-2007, 09:17 PM   #10 (permalink)
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Yeah, what he said.
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Old 04-17-2007, 09:32 PM   #11 (permalink)
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Yeah, what he said.

we still havent got any answer or ideas
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Old 04-17-2007, 11:40 PM   #12 (permalink)
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well what have you been testing all this time? lol...shesh...
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Old 04-18-2007, 06:40 AM   #13 (permalink)
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If you can stall the car with out turning the key off, then do a code retrieval. If this doesn't produce any codes, you'll need a code scanner. With out a code to go by who knows what the computer is trying to say, and you can't very well diagnose a check engine light with out one.
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Old 04-18-2007, 06:55 PM   #14 (permalink)
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1222
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Old 04-19-2007, 12:29 AM   #15 (permalink)
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You both are getting the same code 1222?

I'll repost what 1222 is again, if there are any other codes. Let me know:

1222 is stored when the DME detects excessive deviations in the air-fuel mixture (too rich and too lean) for longer than 10 seconds.

Possible causes: Faulty O2 sensor or bad contacts to O2, fuel tank ran empty or very low, injectors bad or clogged, incorrect fuel pressure (clogged fuel filter, bad regulator, faulty fuel pump), engine temperature sensor bad, intake or exhaust leak, fuel evap control bad or broken vac lines, air flow meter defective and/or the combustion is being messed up by mechanical failure (worn out spark plugs, low compression, intake/exhaust valves, bad plugs, wires, cap rotor, etc)

Here are other DME codes:

1211 DME control unit.
1215 Air flow meter.
1216 Throttle Potentiometer.
1221 Oxygen sensor.
1222 Oxygen sensor control range limit.
1223 Coolant temperature.
1224 Intake air temperature sensor.
1231 Battery voltage.
1232 Idle switch.
1233 Full load switch.
1251 Fuel injector valves cyl. 1+3+5.
1252 Fuel Injector valves cyl. 2+4+6.
1261 Electrical fuel pump circuit.
1263 Idle control valve.
1264 Oxygen sensor heating.
1444 No failures.

Last edited by Starmavin; 04-19-2007 at 12:31 AM.
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