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Engine skipping and stalling on acceleration

 
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BWW  



Joined: 21 Sep 2021
Posts: 58
Location: Idaho, USA

PostPosted: Fri Aug 26, 2022 10:43 am    Post subject: Engine skipping and stalling on acceleration Reply with quote

I set my timing today using Smoothie's very helpful guide (https://www.924board.org/viewtopic.php?t=18355). But when I open the throttle, the engine, skips, sputters, dies, etc. I know there are many possible causes for this, but is there somewhere in particular I should start? Vacuum leaks? Air-fuel mixture? Thanks!
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Brent
'81 931 project car
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Mike9311  



Joined: 14 Dec 2004
Posts: 1678
Location: Chicago-ish

PostPosted: Fri Aug 26, 2022 11:44 pm    Post subject: Reply with quote

vacuum leaks are easy to check so if it idles, just spray brake clean around suspected areas with care. If idle changes due to spray that is you leak.
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1980 931 since 1989
1981 Ideola 931 Club Sport
1982 931 Entwicklungsfahrzeug
1979 924 NA ohne 650 mit 471
1982 931 Red Resurrection - 951 IC
1982 931 parts car / resurrection?
1980 924 NA (R&D lightweight)
1982 931 wana-be GTR race car
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BWW  



Joined: 21 Sep 2021
Posts: 58
Location: Idaho, USA

PostPosted: Sat Aug 27, 2022 2:47 am    Post subject: Reply with quote

Good advice. Thanks, Mike. I will give this a try. I should also mention that there's a clinking/pinging sound coming from the throttle body (I think) when I give it gas. This might be relevant? The video shows what I'm talking about. Thanks again!

https://isu.box.com/s/21ewd0zweqvsd1jf5zjfzs95ug0bd4xo
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Brent
'81 931 project car
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BWW  



Joined: 21 Sep 2021
Posts: 58
Location: Idaho, USA

PostPosted: Tue Aug 30, 2022 7:19 am    Post subject: Reply with quote

I'm following up on this on the off chance that it's useful to someone down the line. I tracked the source of the sound to somewhere in the CIS/k jetronic system. I'm thinking a rebuild might be necessary.
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