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D Hook
Joined: 02 Nov 2002
Posts: 3158
Location: Omaha, NE
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 Posted: Tue Nov 27, 2007 10:42 pm Post subject: |
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+3. Same symptoms. gawd-awful until all four kick in.
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'80 924 n/a SOLD |
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Rasta Monsta
Joined: 12 Jul 2006
Posts: 11732
Location: PacNW
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| Posted: Wed Nov 28, 2007 1:41 am Post subject: |
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This was also what Khal's 931 did when he blew a head gasket.
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Toofah King Bad
- WeiBe (1987 924S 2.5t) - 931 S3
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Khal
Joined: 26 Sep 2003
Posts: 4872
Location: Sunny and lovely interior BC, Canada
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| Posted: Wed Nov 28, 2007 2:50 am Post subject: |
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| Rasta Monsta wrote: | | This was also what Khal's 931 did when he blew a head gasket. |
'Tis true. But mine did it on cold-start. And I had another classic blown head gasket symptom, some white-ish smoke from the exhaust.
With others reporting similar symptoms, and nary a peep about blown head gaskets, I'd suspect the fuel system, too.
I've seen this exact problem on a BMW E21 (same fuel system) that definitely did not have a blown head gasket...
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'80 924 Turbo |
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Rasta Monsta
Joined: 12 Jul 2006
Posts: 11732
Location: PacNW
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| Posted: Wed Nov 28, 2007 4:20 am Post subject: |
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Could also be those two injectors leaking after shutdown and flooding those two cyls.
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Toofah King Bad
- WeiBe (1987 924S 2.5t) - 931 S3
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johnathan1
Joined: 08 Oct 2007
Posts: 308
Location: Downey, Ca
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| Posted: Wed Nov 28, 2007 4:20 pm Post subject: |
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Grrr...I haven't had a chance to check the injectors yet. This cold is really kicking my ass...
And it really sucks that the CIS system is so problematic...I guess I;m really lucky that I took the time and spent the extra cash to seek out a good example of an early 924, or I'm sure i'd be in Porsche hell right now! 
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-1977 924, 4-Spd...Gone
-1987 Toyota Supra Turbo, Pearl White, BPU, 300RWHP @ 10psi.
-1989 Mercedes-Benz 300SEL
WARNING: MAY CONTAIN TRACES OF AUDI OR VW! |
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Mike924
Joined: 12 Aug 2004
Posts: 2601
Location: IoW UK
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| Posted: Wed Nov 28, 2007 5:30 pm Post subject: |
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It's not so bad; once you learn to live with it! 
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1985 Porsche 924 'Lux', Kalahari Beige (my ex)
1993 Porsche 968 Coupe, Midnight Blue, 6 spd
'There is no substitute for a little grease under your fingernails.' - Chrenan, 924board.org |
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Rasta Monsta
Joined: 12 Jul 2006
Posts: 11732
Location: PacNW
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| Posted: Thu Nov 29, 2007 1:19 am Post subject: |
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Yeah, I don't think it's all that problematic. Its a bit sensitive to vacuum leaks and dirty fuel, but once you have it dialed in it runs pretty damn well.
I wonder how many millions of cars it was installed on?
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Toofah King Bad
- WeiBe (1987 924S 2.5t) - 931 S3
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johnathan1
Joined: 08 Oct 2007
Posts: 308
Location: Downey, Ca
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| Posted: Thu Nov 29, 2007 4:08 pm Post subject: |
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OMG I HAVE GOOD NEWS!
After the car almost wouldn't start in the mall parking lot, I got aggravated enough to check my injectors...
I started the car and immediately shut it down, then ran to the engine bay to listen. I could hear a spraying noise coming from the injector area...so I pulled out #3...dry...then I pull out #2...and it is hissing like crazy and smells of gas really bad. So I found my problem!
Does anybody have a few used injectors, that don't leak laying around they could sell me? 
_________________
-1977 924, 4-Spd...Gone
-1987 Toyota Supra Turbo, Pearl White, BPU, 300RWHP @ 10psi.
-1989 Mercedes-Benz 300SEL
WARNING: MAY CONTAIN TRACES OF AUDI OR VW! |
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Rasta Monsta
Joined: 12 Jul 2006
Posts: 11732
Location: PacNW
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| Posted: Thu Nov 29, 2007 4:14 pm Post subject: |
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New ones are pretty cheap, $50 at Auto Haus AZ.
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Toofah King Bad
- WeiBe (1987 924S 2.5t) - 931 S3
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Ozzie
Joined: 12 Mar 2005
Posts: 4448
Location: Townsville, Qld. Australia
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johnathan1
Joined: 08 Oct 2007
Posts: 308
Location: Downey, Ca
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| Posted: Thu Nov 29, 2007 7:21 pm Post subject: |
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Ozzie: Awesome link, thanks! I am guessing you used those injectors on your 924?
Can anyone verify that those injectors will work in my 77'?
_________________
-1977 924, 4-Spd...Gone
-1987 Toyota Supra Turbo, Pearl White, BPU, 300RWHP @ 10psi.
-1989 Mercedes-Benz 300SEL
WARNING: MAY CONTAIN TRACES OF AUDI OR VW! |
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Ozzie
Joined: 12 Mar 2005
Posts: 4448
Location: Townsville, Qld. Australia
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| Posted: Thu Nov 29, 2007 7:56 pm Post subject: |
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according to my parts list the number is the same for the NA on all the 2lt models.
(yes I put a set on mine- fixed many problems)
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Porsche 924 1984 (UK import) NA
Its AUTO and its BLACK
Montego Black on black/red
Engineer of Electro/Mechanical Systems Maintenance |
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johnathan1
Joined: 08 Oct 2007
Posts: 308
Location: Downey, Ca
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| Posted: Fri Nov 30, 2007 7:25 am Post subject: |
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Alright, I ordered those injectors...hopefully they will be here soon...
Is it safe to say that this injector problem is the reason I have been smelling lots of fuel after any amount of acceleration? (My fuel smell is definitely coming from outside the car, with my windows down, the smell is almost intolerable...) I'm also hoping this will solve my ~13MPG problem.
_________________
-1977 924, 4-Spd...Gone
-1987 Toyota Supra Turbo, Pearl White, BPU, 300RWHP @ 10psi.
-1989 Mercedes-Benz 300SEL
WARNING: MAY CONTAIN TRACES OF AUDI OR VW! |
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Rasta Monsta
Joined: 12 Jul 2006
Posts: 11732
Location: PacNW
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| Posted: Fri Nov 30, 2007 8:10 am Post subject: |
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Your mileage should get better, but you may also have a leak at the filler neck. Do a search for more details.
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Toofah King Bad
- WeiBe (1987 924S 2.5t) - 931 S3
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johnathan1
Joined: 08 Oct 2007
Posts: 308
Location: Downey, Ca
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| Posted: Fri Nov 30, 2007 9:03 am Post subject: |
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I know I have l leak at the filler neck as well...but I'm just wondering if im smelling all of the excess fuel that's being injected...guess there's only one way to find out... 
_________________
-1977 924, 4-Spd...Gone
-1987 Toyota Supra Turbo, Pearl White, BPU, 300RWHP @ 10psi.
-1989 Mercedes-Benz 300SEL
WARNING: MAY CONTAIN TRACES OF AUDI OR VW! |
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