Fault codes

[toymachine595]

i have a 95 325is and lately the idle has been screwed up
about every 20-25 seconds the rpms drop almost enough to stall the car and then it rebounds itself
now i recently purchased the peake research scan tool
so i scanned it and i found 4 codes had been set
problem is im not even sure where to start throwin parts at different things
i came out with:
-Output stage, Group 1
-Knock sensor, cyl 4-5-6
-Knock sensor, 1-2-3
-Knock control test pulse
im happy that i have found the codes but still im not sure where to begin
hopefully some of you have any info at all on these codes cause to me they arent making sense, like should i throw some knock sensors in first seeing as 3 of the codes mention knock sensors? but besides that i dont know what output stage even means
well thanks for taking the time to check this out
later

[Hamfisted]

I would clear the codes and try cleaning the mass air flow meter first. It's that thing right behind the air filter box with the electrical plug screwed into it. Use some CRC electrical contact cleaner and spray the probes inside the MAF clean. Even a bad O2 sensor will throw those knock sensor codes.
How's your air filter?
You can also get the codes by stomping on the gas pedal 5 times with the ignition ON (engine not running) and reading the flashes of the Check Engine light. It'll blink once, then a series of quicker flashes indicating the trouble code. But the Peake's is a lot easier to use I guess.






Mike

[polaris448]

Originally Posted by Hamfisted

I would clear the codes and try cleaning the mass air flow meter first. It's that thing right behind the air filter box with the electrical plug screwed into it. Use some CRC electrical contact cleaner and spray the probes inside the MAF clean. Even a bad O2 sensor will throw those knock sensor codes.
How's your air filter?
You can also get the codes by stomping on the gas pedal 5 times with the ignition ON (engine not running) and reading the flashes of the Check Engine light. It'll blink once, then a series of quicker flashes indicating the trouble code. But the Peake's is a lot easier to use I guess.






Mike

that is only with an obdI right?

[Hamfisted]

Yes, the throttle stomping method is only for OBDI BMW's...
'96 and newer are OBDII ....


Mike

[toymachine595]

Well today i cleaned the MAF thoroughly and it didnt make an improvement at all, so im stumped. theres tons of possibilities to start with
i guess ill try
cleaning the ICV
if not ill try some 02 sensors
and then knock sensors
sooner or later its gotta be something along those lines...
..hopefully.
thanks for the replies and help guys