Hello dear community,
Car is E46 1999 320i M52TU engine, i'm from Europe.
Looking for advice regarding the INPA analogue values i get (sorry for the pics quality they were taken with my phone).
Car is running fine, i get no check engine errors, i have recently did the entire intake/admission part: manifold was taken apart and installed new PCV, new DISA, throttle boots, gaskets, o-rings (including the dip stick one), and redid the vanos with the Beysan system.
However i have some strange values in INPA as you may see in the attached images.
2 questions: First question is about the lambda probe banks 1 and 2, before kat-sensor voltages in this picture:
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From my understanding and from what i read online, it should be at around 0.7ish voltages.
INPA shows me values of 0.7ish for about 1-2 seconds, than for the next 1-2 seconds the values drop to 0.1ish or 0.2ish volts, than they get back to 0.7ish, and so on.
So every 2 seconds more or less, the values change from 0.7 to 0.1 or 0.2, and back to 0.7, and than back to 0.1 or 0.2.......is this normal behavior? I read that these sensors rarely go bad, but still...
The second question is about the roughness: here is the pic i get from INPA, engine running at idle speed :
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As you can see, cylinders 3, 6 and 4 have value of 0 (dead zero), while cylinders 1, 5 and 2 are running on different values (probably a bit hot, i don't know).
If i step on the gas and release it, than the cylinders that previously had 0 value are returning different values (not zero), but when engine comes back to idle speed, the cylinders will return to their 0 values. Is it possible that i need to replace the ignition coils? They have never been replaced and i read that they go bad at some point, and the car is more than 20 years old
The spark plugs have been replaced 3 years ago with NGK spark plugs.
It is strange to me as the car don't seem to run rough, like in only 3 cylinders out of 6, power is there i have no issues, no hiccups.
Looking for your advices and thank you,
Car is E46 1999 320i M52TU engine, i'm from Europe.
Looking for advice regarding the INPA analogue values i get (sorry for the pics quality they were taken with my phone).
Car is running fine, i get no check engine errors, i have recently did the entire intake/admission part: manifold was taken apart and installed new PCV, new DISA, throttle boots, gaskets, o-rings (including the dip stick one), and redid the vanos with the Beysan system.
However i have some strange values in INPA as you may see in the attached images.
2 questions: First question is about the lambda probe banks 1 and 2, before kat-sensor voltages in this picture:
From my understanding and from what i read online, it should be at around 0.7ish voltages.
INPA shows me values of 0.7ish for about 1-2 seconds, than for the next 1-2 seconds the values drop to 0.1ish or 0.2ish volts, than they get back to 0.7ish, and so on.
So every 2 seconds more or less, the values change from 0.7 to 0.1 or 0.2, and back to 0.7, and than back to 0.1 or 0.2.......is this normal behavior? I read that these sensors rarely go bad, but still...
The second question is about the roughness: here is the pic i get from INPA, engine running at idle speed :
As you can see, cylinders 3, 6 and 4 have value of 0 (dead zero), while cylinders 1, 5 and 2 are running on different values (probably a bit hot, i don't know).
If i step on the gas and release it, than the cylinders that previously had 0 value are returning different values (not zero), but when engine comes back to idle speed, the cylinders will return to their 0 values. Is it possible that i need to replace the ignition coils? They have never been replaced and i read that they go bad at some point, and the car is more than 20 years old
The spark plugs have been replaced 3 years ago with NGK spark plugs. It is strange to me as the car don't seem to run rough, like in only 3 cylinders out of 6, power is there i have no issues, no hiccups.
Looking for your advices and thank you,
