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 Post subject: 924 turbo Series 2 RUNNING PROBLEM help please
PostPosted: Thu Jan 09, 2020 5:44 pm 
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Joined: Thu Jan 09, 2020 5:31 pm
Posts: 5
Model: 924 turbo series 2
PORSCHE 924 TURBO SERIES 2. My car will idle but when you try and drive it- it is like a kanagroo ...stop..go..stop go...it will not go anywhere. I think its fuel as has a good spark. Is it the fuel metering head? is it one of the fuel pumps not working??
Any help would be nice.


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 Post subject: Re: 924 turbo Series 2 RUNNING PROBLEM help please
PostPosted: Thu Jan 09, 2020 6:53 pm 
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Joined: Tue Mar 25, 2014 12:15 pm
Posts: 1828
Location: North West Essex
Model: 924 Turbo S1
You'll need to run through the test procedure for fuel pressure:
System pressure
Cold control pressure
Warm control pressure as a first step

The procedure is well documented in the technical area of the forum but I think you will need to be a club member to access it.


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 Post subject: Re: 924 turbo Series 2 RUNNING PROBLEM help please
PostPosted: Thu Jan 09, 2020 8:56 pm 
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Joined: Sat Jan 30, 2010 11:13 pm
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Location: Somerset
Model: TheOnly Way Is Turbo
Vacuum leak

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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
2017 VW Passat Variant GTE Advance
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 Post subject: Re: 924 turbo Series 2 RUNNING PROBLEM help please
PostPosted: Fri Jan 10, 2020 12:24 am 
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Joined: Fri Mar 11, 2016 12:13 pm
Posts: 133
Location: Gloucestershire
Model: 924 Turbo
Both previous responses well made.
However I had similar issues to yours which turned out to be a loose connection to the DITC unit.
A well placed cable tie solved the problem.


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 Post subject: Re: 924 turbo Series 2 RUNNING PROBLEM help please
PostPosted: Fri Jan 10, 2020 12:36 am 
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Model: 924 turbo series 2
The DITC unit is the ECU ?


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 Post subject: Re: 924 turbo Series 2 RUNNING PROBLEM help please
PostPosted: Fri Jan 10, 2020 2:40 am 
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Joined: Sat Dec 01, 2007 1:25 pm
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Location: Worcs, UK
Model: 2 x S1 Turbo
Yes and no. It can't really be classed as an ECU as it has no way to control the fuel system - the whole lot is purely mechanical. All it can do is control the ignition timing, hence the name - Digital Ignition Timing Controller, or something like that. It takes inputs from the crank sensor, another possible cause of problems on the S2, and a vacuum sensor.

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 Post subject: Re: 924 turbo Series 2 RUNNING PROBLEM help please
PostPosted: Fri Jan 10, 2020 9:15 am 
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Problem is it can be all sorts of things.

Go through every electrical connection you can find, DTIC (behind the radio) distributor, leads, plugs, ignition unit (Left inner wing) engine earth, earths under the dash, earths under the glovebox.

Then check for vacuum leaks on all the pipework from the intake all the way to the inlet manifold.

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 Post subject: Re: 924 turbo Series 2 RUNNING PROBLEM help please
PostPosted: Fri Jan 10, 2020 9:52 am 
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Joined: Sat Jan 30, 2010 11:13 pm
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Some info your car would be helpful to diagnose further. Is it new to you? Was it running perfectly? Did you do any work that may have instigated the 'mis fire' ?

As Rich says, there is lots of electrical connections to check, lots of hoses to check, it could well be the crank sensor starting to fail. All of the above has been discussed exhaustively in our tech section which is opened to members of the club. The search facility will help immensely finding the answers you require. Its not the first time a turbo has had some issues.

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Steve - Joined: Sat Jan 30, 2010 10:13 pm......think I have lost far too much time in this forum.........
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
2017 VW Passat Variant GTE Advance
2015 Nissan Leaf Tekna


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 Post subject: Re: 924 turbo Series 2 RUNNING PROBLEM help please
PostPosted: Fri Jan 10, 2020 3:42 pm 
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Joined: Thu Jan 09, 2020 5:31 pm
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Model: 924 turbo series 2
Carrera RSR wrote:
Some info your car would be helpful to diagnose further. Is it new to you? Was it running perfectly? Did you do any work that may have instigated the 'mis fire' ?

As Rich says, there is lots of electrical connections to check, lots of hoses to check, it could well be the crank sensor starting to fail. All of the above has been discussed exhaustively in our tech section which is opened to members of the club. The search facility will help immensely finding the answers you require. Its not the first time a turbo has had some issues.


Car has not moved for 7 yrs. Has a new crank sensor (yep was mission impossible to get it) car will idle nicely...but as soon as you try and drive it...wont go forwards-not so much a misfire...I think it feels like nil fuel... its like a bucking bronco pony...just hits a wall...its violent..stop- go stop go... I assume it has two fuel pumps so the second one keeps up with high rpm?


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 Post subject: Re: 924 turbo Series 2 RUNNING PROBLEM help please
PostPosted: Fri Jan 10, 2020 4:44 pm 
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EDSTU1967 wrote:
Carrera RSR wrote:
Some info your car would be helpful to diagnose further. Is it new to you? Was it running perfectly? Did you do any work that may have instigated the 'mis fire' ?

As Rich says, there is lots of electrical connections to check, lots of hoses to check, it could well be the crank sensor starting to fail. All of the above has been discussed exhaustively in our tech section which is opened to members of the club. The search facility will help immensely finding the answers you require. Its not the first time a turbo has had some issues.


Car has not moved for 7 yrs. Has a new crank sensor (yep was mission impossible to get it) car will idle nicely...but as soon as you try and drive it...wont go forwards-not so much a misfire...I think it feels like nil fuel... its like a bucking bronco pony...just hits a wall...its violent..stop- go stop go... I assume it has two fuel pumps so the second one keeps up with high rpm?


Not really. The main external fuel pump provides all the pressure that the engine needs. There is a small low pressure fuel pump inside the bottom of the fuel tank, but many cars (including my own) run just fine without this, providing the rest of the fuel system is up to pressure.

You can't really guess much further without testing fuel pressure, vacuum leaks and electrical connections as per other's advice above.

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