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crow.magnum · Joined: 13 Oct 2007 Posts: 50 Location: SOMERSET ENGLAND

hi, ive got a 1980 931 .
its not been driven for a few month. so today i took it out.

started first time , but it idles at 1200 rpm and when i drove it it had a severe missing problem .
any ideas where to start??

Nein37 · Joined: 29 Dec 2009 Posts: 513 Location: New London, CT

Vacuum lines. Check them all.
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1981 931 CGT replica, OEM CGT intercooler, .8 BAR WG spring, GTS Headlights, Innovative Wide band A/F, A/C delete, 16" Fuchs, Weltmeister 200lb lowering springs, Bilstein HDs front, Koni Sport rears.

crow.magnum · Joined: 13 Oct 2007 Posts: 50 Location: SOMERSET ENGLAND

Ok whats the best way to find an air leak

crow.magnum · Joined: 13 Oct 2007 Posts: 50 Location: SOMERSET ENGLAND

Ok whats the best way to find an air leak

dpw928 · Joined: 02 Nov 2002 Posts: 1860 Location: owasso, ok 74055

Since it is missing and has a high idle, I would check the intake to cylinder head gaskets first. Try spraying a mist of water on each vacuum area and listen for a change in the idle and look for white exhaust smoke.

Dennis
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81 931 5 sp
78 928 5 sp Silver
78 928 AT Euro Black

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11733 Location: PacNW

Best way to find intake leaks is with a smoke machine. Worth a couple of bucks to have a mechanic do this.
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Toofah King Bad

WeiBe (1987 924S 2.5t) - 931 S3

crow.magnum · Joined: 13 Oct 2007 Posts: 50 Location: SOMERSET ENGLAND

Whats going on with this car

I checked for air leaks , I tweeked the intake bolts all were fine. Started the car it idled 1000 rpm. Took it down the road missed real bad turbo would not kick in just made some kind whineing noise . Got home car idled 1500 rpm flipped bonnet had steam coming up for exhaust area and the battery has started to leak acid . Are these all connected or am I on a a roll of bad luck .

dpw928 · Joined: 02 Nov 2002 Posts: 1860 Location: owasso, ok 74055

The battery may have an internal short which could cause low voltage and poor spark. Was the steam from the exhaust caused by the battery acid?

Dennis
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81 931 5 sp
78 928 5 sp Silver
78 928 AT Euro Black

crow.magnum · Joined: 13 Oct 2007 Posts: 50 Location: SOMERSET ENGLAND

No the battery is on the oppisite side

dpw928 · Joined: 02 Nov 2002 Posts: 1860 Location: owasso, ok 74055

Forgot about the right hand drive. Are there any heater hoses in the vicinity of the exhaust that could be spraying coolant?

Dennis
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81 931 5 sp
78 928 5 sp Silver
78 928 AT Euro Black

crow.magnum · Joined: 13 Oct 2007 Posts: 50 Location: SOMERSET ENGLAND

No coolant hoses that im a whare of only the turbo and a breather hose

dpw928 · Joined: 02 Nov 2002 Posts: 1860 Location: owasso, ok 74055

You may want to check for an oil leak at the cam cover or the oil line feed to or from the turbo.

Dennis
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81 931 5 sp
78 928 5 sp Silver
78 928 AT Euro Black

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11733 Location: PacNW

Did you check the charge pipe coming directly off the turbo? Pull up on it and make sure the bracket hasn't come loose or broken.
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Toofah King Bad

WeiBe (1987 924S 2.5t) - 931 S3

crow.magnum · Joined: 13 Oct 2007 Posts: 50 Location: SOMERSET ENGLAND

Its all tight and secure

kcoyle · Joined: 15 Jan 2011 Posts: 712 Location: Long Island, NY