Idle problems

[BADD E39 WAGON]

Check engine light come on at idle

[photoguy30523]

Originally Posted by BADD E39 WAGON

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

[MEDSTUDENT87]

Sounds like the MAF. My car did that and that is what it was.

[Starmavin]

Y.M.M. (Year make model)

[BADD E39 WAGON]

I have a 1990 325

[Starmavin]

Auto or stick?

[gotKRAUT]

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

[///M Power]

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?

[gotKRAUT]

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....

[Starmavin]

Yeah, what he said.

[photoguy30523]

Originally Posted by Starmavin

Yeah, what he said.

we still havent got any answer or ideas

[gotKRAUT]

well what have you been testing all this time? lol...shesh...

[Starmavin]

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.

[photoguy30523]

1222

[Starmavin]

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.