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 Post subject: Re: 924 turbo Series 2 RUNNING PROBLEM help please
PostPosted: Mon Jan 13, 2020 4:15 pm 
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Location: The little old town of East Grinstead, UK
Model: '83 924 / '80 931
Carrera RSR wrote:
althejazzman wrote:
The mixture is the allen head on the fuel distributor. You can't adjust this without an emissions analyser attached to the exhaust. It's extremely sensitive. Often this has been adjusted wrongly to compensate for other problems.


I would not touch it before checking system pressure and if the WUR operating correctly


That's what I meant. Don't touch it because you need testing equipment anyway. But as you said, other variables need eliminating first.

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 Post subject: Re: 924 turbo Series 2 RUNNING PROBLEM help please
PostPosted: Mon Jan 13, 2020 5:12 pm 
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Joined: Sat Jan 30, 2010 11:13 pm
Posts: 15930
Location: Somerset
Model: TheOnly Way Is Turbo
EDSTU1967 wrote:
I found a completely knackered vaccum pipe which was the one on the side of the throttle housing. Also found loose manifold stud, loose rocker cover gasket bolt. Checked all earths...all connections under bonnet. I think its running way too rich...how to adjust air/ fuel mixture? I know their is the brass screw on top of the throttle housing....and the other is in the fuel head...an allen key...but which? Will try to take it for a run on Tuesday. I think the turbo oil seals are knackered as it is very oil smokey at idle and can see oil leaks base of turbo.


CIS does not like ANY vacuum leaks at all. Every single vacuum pipe, elbow and hose needs checking. Even the O ring in the brass screw on the throttle body. A list is in the tech section.

Loose manifold stud? Exhaust or intake? Is it loose or snapped?

"Think'' its running too rich.......don't touch any fuel adjustments until you know for sure. A turbo likes being rich. Lean will kill it. You need to check hot and cold fuel pressures and ensure the WUR is working to spec before touching anything else

Clean the oil off the engine/turbo before thinking the oil seals are gone. Theres plenty of reasons for oil to leak out on an old engine + turbo which has been neglected

Smoke on idle isn't an issue if its not been running right. May be a sticking piston ring due to the lay up. Have you done a compression test yet?

Assume you changed the cam belt? Oil + filter? Fuel filter?
Checked and cleaned the filter/ gauze in the WUR?
Injectors are spraying to spec? In spray pattern and volume?

Lots to check resurrecting a long dead turbo.

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1980 924 Turbo Series 1 - Alpine White & Guards Red
Omega forged pistons, lightened and balanced bottom end, ARP studs + Cometic MLS HG, Piper fast road cam, K27/26 3257 hybrid turbo, 951 ducted FMIC, Custom intake manifold, Mittelmotor dizzy & cam pulley, Adj boost - dyno’d at 225bhp @ 1.0bar on previous CGT turbo, Zeitronix ZT2 & Phormula KS4 knock sensor, 944 turbo all alloy radiator, Hayward & Scott custom tapered race exhaust, GAZ Gold coilovers, Fuch'ed up, Quaife LSD
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 Post subject: Re: 924 turbo Series 2 RUNNING PROBLEM help please
PostPosted: Tue Jan 14, 2020 7:31 am 
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Joined: Sat Dec 01, 2007 1:31 pm
Posts: 19977
Location: Lurking in Preston
Model: 924 Turbo S2
Good advice there ;)

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