Bought another 928, high idle.
07-03-2009, 08:12 PM
#16
Team Owner
6 turns is not a lot if someone had already turned it out to far.
Yes your right about that!
Yes your right about that!
07-04-2009, 05:02 PM
#17
Pro
Thread Starter
okay i have the MAF out. looks clean and fine, but i guess you cannot see a bad MAF by its optical shape? It is a Bosch unit, and someone wrote 928Inl on both inside and outside of it. 928 International?
Anyway, about the hex on the MAF, what is supposed to happen if i turn it clockwise, and how much turn should i try first?
everything else in the engine bay seems well tightened and no obious cracks or leaks anywhere I can get my eyes to.
Anyway, about the hex on the MAF, what is supposed to happen if i turn it clockwise, and how much turn should i try first?
everything else in the engine bay seems well tightened and no obious cracks or leaks anywhere I can get my eyes to.
07-04-2009, 05:16 PM
#18
Rennlist Member
You can't tell by looking at a MAF if it is OK. 3% low outptu and youj will get hesitation on a Euro S2.
The easiest way is trying to set idle CO to 1%. Turn the adjuster 4-5 turns clockwise to see if you get an improvement, if you can't access a CO meter.
I can test for you, on my flow jig.
The easiest way is trying to set idle CO to 1%. Turn the adjuster 4-5 turns clockwise to see if you get an improvement, if you can't access a CO meter.
I can test for you, on my flow jig.
07-04-2009, 06:11 PM
#19
Pro
Thread Starter
i turned the hex 4 rounds and reinstalled. took her out for a little drive and it seems it might have helped. i did not get to drive that much but it was promising.
Thanks John and you other guys. I will test some more and come back with results.
BTW, does this mean that my MAF is starting to go bad already??
Thanks John and you other guys. I will test some more and come back with results.
BTW, does this mean that my MAF is starting to go bad already??
07-06-2009, 04:33 PM
#21
Pro
Thread Starter
so i got to do some test driving today. idle is low and stabile and no hesitation at all! 
on top of that i got some nice new D90 rims which i got balanced and every bit of high speed vibrations are hereby gone 
thanks guys! John, since the MAF might be starting going off i will send it to you for testing, but right now i just want to enjoy my new shark while summer is still here. Will get back to you when winter returns over here
Now i just have to find out why my electric cooling fan doesn't kick in, but i'll take that in another thread.
on top of that i got some nice new D90 rims which i got balanced and every bit of high speed vibrations are hereby gone thanks guys! John, since the MAF might be starting going off i will send it to you for testing, but right now i just want to enjoy my new shark while summer is still here. Will get back to you when winter returns over here
Now i just have to find out why my electric cooling fan doesn't kick in, but i'll take that in another thread.
07-31-2009, 11:33 AM
#22
Pro
Thread Starter
I just turned the screw until it stopped (1 turn more clockwise) and now the idle is dead on 675, and i can not find any vacuum leaks.
08-04-2009, 12:52 PM
#24
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Join Date: Jun 2009
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I suspect the previous owner was trying to mask the stalling and hesitation at acceleration issues. As noted above, all air entering the intake must be metered through the MAF sensor. I'm not sure about the MAF configuration on that year, but you may want to remove the MAF and carefully clean the sensor element . If all seems correct, no vacuum leaks, etc., you'll need to set/check the fuel mixture.
08-04-2009, 04:50 PM
#26
Pro
Thread Starter
but that does not add up with this:
Originally Posted by RicerSchnitzzle
Try turning it all the way in. The car does not die, you have a vacuum leak. THat could also cause the hesitation when reving and weak mixture. Raising the idle with the set screw can mask things.
Try turning it all the way in. The car does not die, you have a vacuum leak. THat could also cause the hesitation when reving and weak mixture. Raising the idle with the set screw can mask things.
