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Topic: Possible MAF problem (solved!) (Read 767 times) |
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Kjetil S
Senior Member
2001 BMW 520iat
Posts: 1419
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Possible MAF problem (solved!)
« on: Nov 16th, 2007, 7:43pm » |
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Hello,
Today I noticed that the car (2.0 16v manual) wouldn't go below 2500-3500rpm no matter if it was idling or cruising. I checked the throttle body and it sits at idle position touching the stop screw, neither the throttle wire or the cruise control wire have any tension in them.
I tried disconnecting the MAF and immediately the idle dropped to 500-900rpm, however it hunts somewhat. When I reconnect the MAF, it shoots up to 2500-3000rpm again.
I haven't tried cleaning the MAF (yet), that would be a job for tomorrow, but am I right in thinking that the problem is either a dirty or borked MAF?
The car is driveable with the MAF disconnected, but is prone to stalling when I hold the clutch.
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Dave
Senior Member
Tourmallard 24v (ex-owner)
Posts: 1984
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Re: Possible MAF problem
« Reply #1 on: Nov 16th, 2007, 7:49pm » |
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That an odd one. Have you had a look at the idle control valve?
Is your fuel tank nearly empty? That can cause a high idle, shouldn't be that high though of course!
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Kjetil S
Senior Member
2001 BMW 520iat
Posts: 1419
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Re: Possible MAF problem
« Reply #2 on: Nov 16th, 2007, 7:56pm » |
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I did try disconnecting the IACV, and that did absolutely nothing. Fuel tank is about half full
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Kjetil S
Senior Member
2001 BMW 520iat
Posts: 1419
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Re: Possible MAF problem (solved)
« Reply #3 on: Nov 17th, 2007, 2:46pm » |
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Problem solved!
I tried cleaning the MAF (emptied half a can of brake cleaning into it) without any effect at all. I then tried giving the IACV the same treatment and giving it a couple of drops of oil on the shaft afterwards. Now it sits perfectly at 800rpm and purrs like a kitten.
One question though: should the IACV close completely when disconnected? Mine stops at approx. 1mm from full close. I can push it closed but when released, it opens slightly.
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Tompion
Administrator
1997 2.3 Ultima estate.
Posts: 2918
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Re: Possible MAF problem (solved)
« Reply #4 on: Nov 17th, 2007, 11:14pm » |
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on Nov 17th, 2007, 2:46pm, Kjetil S wrote:Problem solved!
One question though: should the IACV close completely when disconnected? Mine stops at approx. 1mm from full close. I can push it closed but when released, it opens slightly. |
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Don't know if it's supposed to be like that, but mine is the same (I'd guess at more than 1mm, but not looked recently).
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Jonnycab
Senior Member
Former owner of 2.3 Ultima Facelift saloon
Posts: 3900
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Re: Possible MAF problem (solved)
« Reply #5 on: Nov 18th, 2007, 12:59am » |
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on Nov 17th, 2007, 11:14pm, Tompion wrote:
Don't know if it's supposed to be like that, but mine is the same (I'd guess at more than 1mm, but not looked recently). |
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Mine is the same as well & I have a slightly missing idle in neutral, but put it in D or R & the idle is fine 
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