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924 starts, idles very rough, won't accelerate? What to try
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agfisher  



Joined: 09 May 2007
Posts: 427
Location: West Hartford, CT

PostPosted: Sat Feb 03, 2018 11:24 am    Post subject: Reply with quote

Have you done any measurements of the volume of fuel delivered by the pump too the engine bay? To the injectors? I believe there are procedures for doing this here on the board and in Haynes.
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RC  



Joined: 25 Mar 2007
Posts: 2624
Location: Australia

PostPosted: Sat Feb 03, 2018 12:20 pm    Post subject: Reply with quote

Green wire & connector is shielded cable that would have pluged into the original VR (pick up coil) dizzy.
The pic of dizzy with capacitor on side is probably points, hence why I said post pic of dizzy WITHOUT CAP. And again, WHAT YEAR???

Seems to idle not too bad anyway. Besides all the dodgy wiring and changed dizzy & etc, your main problem now appears to be VACUUM LEAKS in intake tract and/ or the fuel distributor. You will need to do some flow tests, check the metering plate / AFM, and other tasks that will require much research on this board and/or a proper manual to understand.

I`ve PM you regarding a factory manual.
If any other board members don`t yet have a factory workshop manual then PM me too.
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Allan @ DTA wrote:
I have no issue with superchargers, they are for guys who want to drive a car rather than talk about horsepower with their baseball cap on backwards
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hepkat63  



Joined: 25 Jan 2018
Posts: 15
Location: Narrandera

PostPosted: Mon Feb 05, 2018 10:49 am    Post subject: Reply with quote

thanks for the reply. Sorry, it is a 1980 model i believe. Going to check the vacuum hoses best I can. Is there a clear diagram showing where they all should be and what they are connected too floating around on the net and/or forum please?
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RC  



Joined: 25 Mar 2007
Posts: 2624
Location: Australia

PostPosted: Thu Feb 08, 2018 12:18 am    Post subject: Reply with quote

Sure there were some pics or diagrams floating around here somewhere, if photofuket hasn`t killed them. Maybe from Smoothie or Ozzy .... try search. Oh, USA models will be somewhat different from ROW/ Au/ UK/ Euro.

It is the large rubber boots between TB and AFM that are critical. CIS relies on engine vacuum to lift the AFM plate to "measure" airflow and increase fuel proportionally. Perhaps just plug any open lines/ nipples you`re not sure about while troubleshooting it.
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World`s quickest 924 2L slushbox

Allan @ DTA wrote:
I have no issue with superchargers, they are for guys who want to drive a car rather than talk about horsepower with their baseball cap on backwards
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agfisher  



Joined: 09 May 2007
Posts: 427
Location: West Hartford, CT

PostPosted: Thu Feb 08, 2018 12:47 am    Post subject: Reply with quote

Here's an image I did several years ago. It might not have everything on it but should give you a start. This is for a '77.


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hepkat63  



Joined: 25 Jan 2018
Posts: 15
Location: Narrandera

PostPosted: Thu Feb 08, 2018 9:20 am    Post subject: Reply with quote

thank you.
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hepkat63  



Joined: 25 Jan 2018
Posts: 15
Location: Narrandera

PostPosted: Sat Feb 10, 2018 10:07 pm    Post subject: Reply with quote

ok, still going with this and getting no where fast. I have had it suggested to me that it could be the throttle position switch sensor. I have had a look under the hood, but can't find anything that looks like (link below for picture) this? I also searched the .pdf manual I have and they don't list one? Perhaps my 1980 model doesn't have one?
So, I'm still stuck - car starts, but won't rev !

https://www.ebay.com/itm/Porsche-944-924-throttle-position-switch-sensor-0-280-120-301-Bosch-ref-B3-1/322937697445?hash=item4b309634a5:g:fzEAAOSwm3paMp-y&vxp=mtr
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agfisher  



Joined: 09 May 2007
Posts: 427
Location: West Hartford, CT

PostPosted: Sat Feb 10, 2018 11:53 pm    Post subject: Reply with quote

Did you ever run the fuel delivery tests? Measure the volume delivered to the fuel distributor and then measure the volume delivered to each injectors? The procedure is mentioned in Haynes and should also be in several places here on the board.
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scm924s  



Joined: 22 Oct 2010
Posts: 214
Location: Gloucester UK

PostPosted: Sun Feb 11, 2018 2:23 am    Post subject: Reply with quote

The strange red cap on the AAV (in front of the coil) is not right, that should be connected to the rubber air trunking to the throttle body
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Fasteddie313  



Joined: 29 Sep 2013
Posts: 1445
Location: Not Detriot - NMI

PostPosted: Sun Feb 11, 2018 5:21 am    Post subject: Reply with quote

hepkat63 wrote:
ok, still going with this and getting no where fast. I have had it suggested to me that it could be the throttle position switch sensor. I have had a look under the hood, but can't find anything that looks like (link below for picture) this? I also searched the .pdf manual I have and they don't list one? Perhaps my 1980 model doesn't have one?
So, I'm still stuck - car starts, but won't rev !

https://www.ebay.com/itm/Porsche-944-924-throttle-position-switch-sensor-0-280-120-301-Bosch-ref-B3-1/322937697445?hash=item4b309634a5:g:fzEAAOSwm3paMp-y&vxp=mtr


Euro cars don't have lambda systems therefore have no throttle microswitches, O2 sensor, frequency valve, etc.
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