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Paul · Posted: Fri Nov 11, 2016 12:29 pm Post subject: Ghost issues

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?
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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.

edredas · Joined: 09 Dec 2004 Posts: 861 Location: Charlotte, NC

FPR?

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'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

Paul · Posted: Fri Nov 11, 2016 1:43 pm Post subject:

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.

edredas · Joined: 09 Dec 2004 Posts: 861 Location: Charlotte, NC

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

KDJones2000 · Joined: 14 Sep 2010 Posts: 322 Location: Phoenix, AZ

Bad coolant cap?
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1987 924S SPEC car
Team Toofah Racing
1988 944 Turbo S

edredas · Joined: 09 Dec 2004 Posts: 861 Location: Charlotte, NC

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

Fifty50Plus · Posted: Sat Nov 12, 2016 10:48 am Post subject:

Stuck thermostat
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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

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11723 Location: PacNW

Broken impellor.
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Toofah King Bad

WeiBe (1987 924S 2.5t) - 931 S3

edredas · Joined: 09 Dec 2004 Posts: 861 Location: Charlotte, NC

Fifty50Plus · Posted: Sat Nov 12, 2016 12:57 pm Post subject:

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