Help with my Baby please

I have a 92 325i (fondly dubbed Betty) and am having problems with her. My husband has done everything we can figure and still nothing. It lopes or surges at an idol, back fires, has no pickup and is getting poor fuel mileage. We have checked fuel pump, fuel regulator, changed plugs (to platinum 4 we will be changing that) changed o2 sensor, mass airflow sensor, a bad coil, injector rails and the computer. We have checked all the the replaced parts including injectors with positive results. We are not sure what the problem is and are desperately seeking help. Any ideas?

Fuel filter. Clogged ICV. Torn intake boot/vac leak somewhere. Make sure you use some good NGK's too.

Did you check for vacuum leaks?

Well, air, spark and fuel, that's what you need and it looks like you are covering that. It reminds me of a problem I had once. Are there any wires you have cut and spliced uner the hood? If so, unwrap them and review them. Yeah. I agree with the vac leaks and ICV check too.

i dont understand. you changed the spark plugs or you're going to. also did you only replace one coil? i would try all new coils and plugs but what do i know. also with these issues i would imagine a check engine light on. do you have one? or know the code if you do..

only had one coil that was bad so we replaced one. We changed the plugs but have heard and actually experienced bad things with the platinum 4 so we are changing them again. The only code the car pulls is 1221. When we first started working on it it pulled a 1222.

Changed fuel filter, oil and oil filter

Originally Posted by AngelWinks

I have a 92 325i (fondly dubbed Betty) and am having problems with her. My husband has done everything we can figure and still nothing. It lopes or surges at an idol, back fires, has no pickup and is getting poor fuel mileage. We have checked fuel pump, fuel regulator, changed plugs (to platinum 4 we will be changing that) changed o2 sensor, mass airflow sensor, a bad coil, injector rails and the computer. We have checked all the the replaced parts including injectors with positive results. We are not sure what the problem is and are desperately seeking help. Any ideas?

I suggest checking to see if the catalytic converter is plugged. They often corrode from the inside and become blocked - this may lead to some of the symptoms you are describing.
Also check for air leaks in the intake manifold or any of the air hoses. If the car is on a hoist - tap the catalytic converter. If it sound like it is full of gravel - it might be plugged.

Also: Check idle control valve - Before changing all these parts have a mechanic give you a computer fault analysis.

Bet your timing is off.


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change sparkplugs back to OEM ngk not some bosch +4 which causes worse idle also check ICV MAF etc.