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Paul
Joined: 02 Nov 2002 Posts: 9491 Location: Southeast Wisconsin
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Posted: Fri Nov 11, 2016 12:29 pm Post subject: Ghost issues |
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The Ghost (87 924S) began stumbling under throttle a few weeks back. Ignition system checked out ok, no vacuum leaks found, compression good, fuel pressure was fine and responded properly when blipping the throttle. O2 sensor indicated rich mixture while stumbling.
Want to guess what it was? _________________ White 87 924S "Ghost"
Silver 98 986 3.6l 320 HP "Frank N Stein"
White 01 986 "Christine"
Polar Silver 02 996TT. "Turbo"
Owned and repaired 924s since 1977
Porsche: It's not driving, it's therapy. |
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edredas
Joined: 09 Dec 2004 Posts: 861 Location: Charlotte, NC
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Posted: Fri Nov 11, 2016 12:59 pm Post subject: |
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FPR?
_________________ '84 944 -White, Brown interior
'84 944 -Red, Automatic
'86 944 -Garnet, Fully loaded, Koni suspension
'87 924S -Red, 300hp 951 swap
'87 924S -Red, Project Car
'88 924S -Red, Daily Driver |
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Paul
Joined: 02 Nov 2002 Posts: 9491 Location: Southeast Wisconsin
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Posted: Fri Nov 11, 2016 1:43 pm Post subject: |
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Yep!
I almost ruled it out when the pressures reacted properly and a vacuum check of the diaphragm resulted in it holding vacuum with the engine off.
With engine running however fuel dribbled out of the vacuum port! _________________ White 87 924S "Ghost"
Silver 98 986 3.6l 320 HP "Frank N Stein"
White 01 986 "Christine"
Polar Silver 02 996TT. "Turbo"
Owned and repaired 924s since 1977
Porsche: It's not driving, it's therapy. |
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edredas
Joined: 09 Dec 2004 Posts: 861 Location: Charlotte, NC
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Posted: Sat Nov 12, 2016 8:42 am Post subject: |
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Nice, something to look out for next time I'm troubleshooting. There were a few things that I was thinking could also cause that, and I almost ruled the FPR out since you had checked the fuel pressure, but it was the only thing that fit...
That said, we could play a long game of this with all the things I've come across in the shop.
I once had a guy tell me his 924S was overheating. When we started it up, it didn't take long before the gauge was heading into the red and it was puking coolant everywhere. There was no white smoke in the exhaust and the engine passed a compression test.
Anyone want to guess what it was? _________________ '84 944 -White, Brown interior
'84 944 -Red, Automatic
'86 944 -Garnet, Fully loaded, Koni suspension
'87 924S -Red, 300hp 951 swap
'87 924S -Red, Project Car
'88 924S -Red, Daily Driver |
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KDJones2000
Joined: 14 Sep 2010 Posts: 322 Location: Phoenix, AZ
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Posted: Sat Nov 12, 2016 9:00 am Post subject: |
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Bad coolant cap? _________________ 1987 924S SPEC car
Team Toofah Racing
1988 944 Turbo S |
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edredas
Joined: 09 Dec 2004 Posts: 861 Location: Charlotte, NC
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Posted: Sat Nov 12, 2016 10:25 am Post subject: |
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Nope, good guess though.
Any other guesses? _________________ '84 944 -White, Brown interior
'84 944 -Red, Automatic
'86 944 -Garnet, Fully loaded, Koni suspension
'87 924S -Red, 300hp 951 swap
'87 924S -Red, Project Car
'88 924S -Red, Daily Driver |
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Fifty50Plus
Joined: 28 Feb 2008 Posts: 1354 Location: Washington DC area
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Posted: Sat Nov 12, 2016 10:48 am Post subject: |
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Stuck thermostat _________________ 1979 924 NA race car
1982 924 NA race car - Sold
1982 924 Turbo almost a PoS
1981 924 Turbo a real PoS, new engine
1982 924 Turbo nice body, blown engine
1972 911 E race car - going to Vintage
Various 944s to become IT-S race car |
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Rasta Monsta
Joined: 12 Jul 2006 Posts: 11723 Location: PacNW
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Posted: Sat Nov 12, 2016 11:14 am Post subject: |
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Broken impellor. _________________ Toofah King Bad
- WeiBe (1987 924S 2.5t) - 931 S3
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edredas
Joined: 09 Dec 2004 Posts: 861 Location: Charlotte, NC
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Posted: Sat Nov 12, 2016 11:36 am Post subject: |
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Fifty50Plus wrote: | Stuck thermostat |
Nope, but you're in the right area.
Rasta Monsta wrote: | Broken impellor |
Yup, looks like the belt was too tight which bent the shaft, embedding the impeller into the waterpump. I would've thought I'd heard the belt squealing or some other signs, so it stumped the hell out of me... _________________ '84 944 -White, Brown interior
'84 944 -Red, Automatic
'86 944 -Garnet, Fully loaded, Koni suspension
'87 924S -Red, 300hp 951 swap
'87 924S -Red, Project Car
'88 924S -Red, Daily Driver |
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Fifty50Plus
Joined: 28 Feb 2008 Posts: 1354 Location: Washington DC area
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Posted: Sat Nov 12, 2016 12:57 pm Post subject: |
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Ooohh, BMW impellers as well as Dodge Intrepids (plastic) would swell/shrink
and slip (not keyed or pegged) when hot and cause the same condition in traffic but not the open road. _________________ 1979 924 NA race car
1982 924 NA race car - Sold
1982 924 Turbo almost a PoS
1981 924 Turbo a real PoS, new engine
1982 924 Turbo nice body, blown engine
1972 911 E race car - going to Vintage
Various 944s to become IT-S race car |
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