Hi,My 328i ('97) is having rough idling problem. My mechanic (BlueGreen) changed 1 ingnition coil (second hand, RM100) but there was no improvement and the problem still persited. When I complained he said its the MAF sensor problem also. When he disconnected the MAF the idling improved. Cost to change it is RM1000 for new and around RM500 second hand. I didnt change the MAF as I wasn't sure if he is right since he changed the ignition coil, apparently for no reason.Went to a different workshop for 2nd opinion (Autobahn @Sunway) the foreman says its the oil separator. Yesterday I took out the MAF and cleaned it with CRC MAF Sensor cleaner. The idling improved but still not perfect.If I rev up the engine for sometime it seems to be ok. But with out reving the engine goes close to stalling. The problem dosnt appear at RPM>1K and after driving for sometime seems to be ok.Now I am confused, since two workshops say two different thing. What could be the problem?1. MAF sensor? May be I didnt clean properly and try again? Or reset the computer?2. Oil separator? Will aprreciate your suggestions.Thanks in advance.
MAF Sensor or Oil Separator Problem?
- Thread starter tawfiq
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valvetronix
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Hi bro,
My take would be the MAF since you mentioned that the engine ran better if its unplugged. Did BlueGreen swap out with another unit that is known in a good condition? If it ran better, most probably your MAF is on its way out. Do take note that with a 'new' MAF installed, the car would need sometime to adjust accordingly.
Did you notice any symptoms prior to this issue? High fuel consumption, poor performance, etc.
cheers,
My take would be the MAF since you mentioned that the engine ran better if its unplugged. Did BlueGreen swap out with another unit that is known in a good condition? If it ran better, most probably your MAF is on its way out. Do take note that with a 'new' MAF installed, the car would need sometime to adjust accordingly.
Did you notice any symptoms prior to this issue? High fuel consumption, poor performance, etc.
cheers,
valvetronix;830453 said:
Hi Valvetronix,
BlueGreen swapped 1 ignition coil but that didnt make any difference.
I did notice some rough idling before this.
I will try to clean the MAF again and see if it helps. Otherwise need to change MAF I guess
Thanks
Just get some good electronic cleaner and try clean the MAF. But normally if you disconnect the MAF you will not get rough idling. Just increase of fuel consumption as it is richer now.
try checking other stuff eg. Knock sensor and crank sensor.
try checking other stuff eg. Knock sensor and crank sensor.
JFT63
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the failing oil separator cant be detected by the diagnostic tool..if there is no error in the diagnosis, do have it checked, u need to take it out to inspect the item.Any pressure leak will affect the idle..i faced that issue with my e39..just my 0.0003cent
consoglieri
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Was there any check engine sign?try cleaning the air filter as well while cleaning the MAF.check for sign of crack rubber boot after the MAF.
Got my car checked today from WQW (Mr. Wong) for a 3rd opinion.
He confirmed its due to a leak in CCV(oil separator). Couldn't get it changed today as I went there around 4pm and he doesn't have enough manpower to work on my car. Asked me go on Saturday. Mr. Wong seemed to be a very nice person and wasn't pushing to change other parts. He even asked whether I want new or 2nd hand.
Luckily didn't listen to the BlueGreen foreman and change the MAF. Would have paid RM450 (that's what he asked for a 2nd hand MAF) for nothing like the ignition (RM100)
Will let you guys know what happens after the CCV change on Saturday.
Thanks for your help.
He confirmed its due to a leak in CCV(oil separator). Couldn't get it changed today as I went there around 4pm and he doesn't have enough manpower to work on my car. Asked me go on Saturday. Mr. Wong seemed to be a very nice person and wasn't pushing to change other parts. He even asked whether I want new or 2nd hand.
Luckily didn't listen to the BlueGreen foreman and change the MAF. Would have paid RM450 (that's what he asked for a 2nd hand MAF) for nothing like the ignition (RM100)
Will let you guys know what happens after the CCV change on Saturday.
Thanks for your help.
tawfiq;830956 said:Got my car checked today from WQW (Mr. Wong) for a 3rd opinion.
He confirmed its due to a leak in CCV(oil separator). Couldn't get it changed today as I went there around 4pm and he doesn't have enough manpower to work on my car. Asked me go on Saturday. Mr. Wong seemed to be a very nice person and wasn't pushing to change other parts. He even asked whether I want new or 2nd hand.
Luckily didn't listen to the BlueGreen foreman and change the MAF. Would have paid RM450 (that's what he asked for a 2nd hand MAF) for nothing like the ignition (RM100)
Will let you guys know what happens after the CCV change on Saturday.
Thanks for your help.
U can get ori ventilation valve around 200(e39). So try not to get slaughtered.
