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Boost and vacuum issues...
I picked up an '86 951 today. It seems to idle a little rough and starts off a little rough until it gets to about 2000rpms then it runs like a really solid n/a. It doesn't seem to have any boost at any rpms. The PO replaced head, the fuel pressure regulator, vacuum lines, and cycling valve, to no avail. The good news is, I have another turbo that runs great to use parts from to diagnose. Any ideas on where to start?
Thanks!
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'87 951 Nile Green, '86 951 Black, '86 951 Sapphire Metallic, '87 944 Nautit Blue, '84 944 Black (sunroof delete) "Track Beast!," '87 944 Black (LSD, Konis) (wife's track car) |
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03-25-2015, 05:04 PM
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Join Date: May 2008
Location: Harford Co, MD
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Do you have an air compressor or access to one? A boost leak tester is easy to make and can be a huge help in these situations. That is where I would start.
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-Brad 2002 Carrera2 1986 944 Turbo |
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03-25-2015, 05:36 PM
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Good idea!
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'87 951 Nile Green, '86 951 Black, '86 951 Sapphire Metallic, '87 944 Nautit Blue, '84 944 Black (sunroof delete) "Track Beast!," '87 944 Black (LSD, Konis) (wife's track car) |
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03-25-2015, 05:38 PM
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Anyone else?
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'87 951 Nile Green, '86 951 Black, '86 951 Sapphire Metallic, '87 944 Nautit Blue, '84 944 Black (sunroof delete) "Track Beast!," '87 944 Black (LSD, Konis) (wife's track car) |
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03-26-2015, 04:52 PM
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Toofah King Bad
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Drive it around and check the pipe between the wastegate and the cat. If it's hot, WG is stuck open = no boost.
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» 1987 924S Turbo - Got Boost? « "DETERMINATION. Sometimes cars test us to make sure we're worthy. Fix it." - alfadoc |
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03-27-2015, 07:17 AM
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winter-hater club member
Join Date: Oct 2003
Location: salt lake city, utah
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also, make yourself the led KLR blink code dealio. that will tell you if it is in limp mode and, perhaps, why.
also, a large vacuum leak can turn into a large boost leak. i'd look for splits or other issues on the high pressure side of the intake system, from the turbo to the cylinder head.
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2000 Corvette - ????, 2007 Buell XB9R - Astrid, 1996 Discovery - Piglet, 2000 Forester "COOL PRIUS!" - Nobody Ever Last edited by nynor; 03-27-2015 at 03:03 PM.. |
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03-27-2015, 02:58 PM
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I pulled the wastegate open- no valve in it...at all. Probably why it wouldn't boost!
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'87 951 Nile Green, '86 951 Black, '86 951 Sapphire Metallic, '87 944 Nautit Blue, '84 944 Black (sunroof delete) "Track Beast!," '87 944 Black (LSD, Konis) (wife's track car) |
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03-28-2015, 06:54 PM
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Well that is concerning!
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03-28-2015, 07:26 PM
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don't you just love all the little surprises on these projects.
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Bob Cox 78 930 clone project car. 87 924S resurrect at some point. 84 928S, Ruby Red linen/brown interior - sold  86 944 turbo my new DE/track car - sold
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03-29-2015, 05:43 AM
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Toofah King Bad
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Quote:
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» 1987 924S Turbo - Got Boost? « "DETERMINATION. Sometimes cars test us to make sure we're worthy. Fix it." - alfadoc Last edited by Rasta Monsta; 03-29-2015 at 07:53 AM.. |
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03-29-2015, 07:49 AM
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winter-hater club member
Join Date: Oct 2003
Location: salt lake city, utah
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Quote:
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2000 Corvette - ????, 2007 Buell XB9R - Astrid, 1996 Discovery - Piglet, 2000 Forester "COOL PRIUS!" - Nobody Ever |
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03-29-2015, 09:36 AM
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winter-hater club member
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this begs the question: where did it go? is it possible for the exhaust system to swallow it?
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2000 Corvette - ????, 2007 Buell XB9R - Astrid, 1996 Discovery - Piglet, 2000 Forester "COOL PRIUS!" - Nobody Ever |
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03-29-2015, 01:33 PM
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Registered User
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I literally found it- in the exhaust pipe behind the wastegate, the pipe that runs along the cat converter.
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'87 951 Nile Green, '86 951 Black, '86 951 Sapphire Metallic, '87 944 Nautit Blue, '84 944 Black (sunroof delete) "Track Beast!," '87 944 Black (LSD, Konis) (wife's track car) |
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03-29-2015, 03:56 PM
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winter-hater club member
Join Date: Oct 2003
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at least the turbo didn't eat it.
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2000 Corvette - ????, 2007 Buell XB9R - Astrid, 1996 Discovery - Piglet, 2000 Forester "COOL PRIUS!" - Nobody Ever |
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03-29-2015, 04:44 PM
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Quote:
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-Brad 2002 Carrera2 1986 944 Turbo |
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03-29-2015, 06:53 PM
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winter-hater club member
Join Date: Oct 2003
Location: salt lake city, utah
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FYI, the turbocharger is downstream from the wastegate, where the valve is missing.
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2000 Corvette - ????, 2007 Buell XB9R - Astrid, 1996 Discovery - Piglet, 2000 Forester "COOL PRIUS!" - Nobody Ever |
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03-29-2015, 08:34 PM
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Registered
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Quote:
__________________
-Brad 2002 Carrera2 1986 944 Turbo |
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03-30-2015, 09:44 AM
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winter-hater club member
Join Date: Oct 2003
Location: salt lake city, utah
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Quote:
__________________
2000 Corvette - ????, 2007 Buell XB9R - Astrid, 1996 Discovery - Piglet, 2000 Forester "COOL PRIUS!" - Nobody Ever |
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03-30-2015, 10:48 AM
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944 addict
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Don't scare me with stuff like that. I'm still working on my newly acquired 951 and I this turbo stuff fogs my mind sometimes.
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3 944's, 2 Boxsters and one Caman S, and now one 951 turbo. Really miss the Cayman. Some people try to turn back their "odometers." Not me. I want people to know 'why' I look this way. I've traveled a long way and some of the roads weren't paved. |
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03-30-2015, 06:26 PM
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Registered User
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WOW! It's amazing how much better a car can run when all of the pieces are back in order! Looks like I made a good deal on this turbo.
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'87 951 Nile Green, '86 951 Black, '86 951 Sapphire Metallic, '87 944 Nautit Blue, '84 944 Black (sunroof delete) "Track Beast!," '87 944 Black (LSD, Konis) (wife's track car) |
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03-31-2015, 12:36 PM
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Shaggy
Red
Chumpy
Weiße Scheiße
Porsche 944 NA
1986 Porsche 951
