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Registered
Join Date: Jul 2013
Location: Plano, TX
Posts: 306
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i had a completely loose hose clamp on the back of the intake boot that was causing hesitation issues. simply tightening the clamp seems to have cured the hesitation issues - i say that because i haven't had it on the road much lately. first test drive (afterwards) seemed to indicate all was normal again. check all connections on the boot.
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'04 GT3 '97 C4S '90 C2 '86 951 |
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07-31-2014, 11:22 AM
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Join Date: Dec 2013
Posts: 344
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I sprayed carb cleaner around the hoses on top of the engine... no changes, no smoke, no impact.... doesn't SEEM like there's a vacuum leak based on that test.
Fuel filter - I bought one to put in, but my mechanic (and others) have said that with fuel filter, it either works or doesn't... wouldn't cause an intermittent problem. Thoughts? Thanks -Glenn |
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08-01-2014, 05:29 AM
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Join Date: Dec 2013
Posts: 344
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Plus 3, 2, and 1. #3 was the one with the loose connection at the distributor.
I nerve I got oil on #1 while removing it. How do these look? 
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08-01-2014, 06:36 AM
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Join Date: Dec 2013
Posts: 344
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UGH. Autocorrect...
These are PLUGS 3, 2, and 1 in that order. #1, I think I get oil on it while removing it. Thanks -Glenn |
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08-01-2014, 09:38 AM
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Member 911 Anonymous
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Before you clean in re-install the plugs, check the OHMs on those and the Cap and Rotor too.
I am concerned you are not getting the Warm Up Idle as you say Fast Idle. Here is a better way to check for a vacuum leak, driver her around for 20 minutes or up to full operating temperature, leave the car on, place your eBrake then open engine lid and remove the oil cap, if she does not drop in idle you have a vacuum leak and need to locate it. A smoker is the best way to ID the leak. I found my leak behind the throttle body at the U hose. Use a mirror and you can see it too. BTW, what is your location? maybe a fellow 3.2 can swing by to take a look???
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'85 Carrera Targa Factory Marble Grey/Black * Turbo Tail * 930 Steering Wheel* Sport Seats * 17" Fuchs (r) * 3.4 * 964 Cams * 915 * LSD * Factory SS * Turbo Tie Rods * Bilsteins * Euro Pre-Muff * SW Chip on 4K DME * NGK * Sienes GSK * Targa Body Brace PCA/POC |
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08-01-2014, 09:49 AM
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Registered User
Join Date: Dec 2013
Posts: 344
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I am in central NJ. thanks
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08-01-2014, 09:54 AM
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Registered
Join Date: Mar 2008
Location: Scotland
Posts: 31
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I had similar symptoms on my 964 and it was the MAF. Can't recondition them so you need a good 2nd hand one to try.
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1990 Cup 1991 RS 1994 CS |
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08-01-2014, 11:34 AM
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Join Date: Dec 2013
Posts: 344
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Ugh. I think it's a vacuum leak. No, the idle doesn't change when I remove the oil cap. And spraying carb cleaner BEHIND the black right-angle pipe going into the AFM definitely DID bring the idle speed back up. I tried looking back there with a small mirror, but don't see anything obvious.
The front of the right-angle bend plastic pipe has some surface cracking, but it doesn't look that bad to me. I see a hosing coming out the back, going to the oil tank... and of course the connection to the AFM on one side and throttle body on the other. Is there a common failure point here, that it is likely to be? Any tips for me on how to hunt this down? I'll have to search the forum and see what others have found. I did change the O2 sensor, and the plugs. I have no idea how old the old ones were, so I am considering this a good idea anyway to change. Thanks -Glenn |
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08-01-2014, 03:11 PM
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Registered User
Join Date: Dec 2013
Posts: 344
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997Sbeebe - when you say, the back of the intake boot - are you referring to the hose coming out of the AFM?
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08-01-2014, 03:41 PM
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Marble Grey
