 Diagnose this blip under acceleration please |
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| s13u74cr4 |
 Oct 18 2026, 03:14 PM
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#1
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Member  Group: Members Posts: 55 Joined: 2-September 23 From: PNW Member No.: 27,558 Region Association: Pacific Northwest  |
Sometimes under acceleration I get this slight hiccup. As if for a moment it stalls. Quickly recovers, and only under acceleration. And it seems only when not fully warm. Almost like for a moment it’s fuel starved. I have replaced ALL all the fuel lines, SS lines, so I think the issue is elsewhere just don’t know where.
Link to a video. I don’t think embedding the video in a post works. Video |
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| porschetub |
Oct 18 2026, 10:24 PM
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914 Guru Group: Members Posts: 5,189 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
QUOTE(s13u74cr4 @ Oct 19 2026, 10:14 AM)  Sometimes under acceleration I get this slight hiccup. As if for a moment it stalls. Quickly recovers, and only under acceleration. And it seems only when not fully warm. Almost like for a moment it’s fuel starved. I have replaced ALL all the fuel lines, SS lines, so I think the issue is elsewhere just don’t know where. Link to a video. I don’t think embedding the video in a post works. Video Check your dizzy isn't gummed up on the top advance plate, after cleaning vacuum check the advance is @ full advance and not leaking ,it should hold vacuum for a reasonable amount of time can't remember off hand but 12 inHg will be enough ,the" suck on the hose trick " isn't enough for a real test, (IMG:style_emoticons/default/beer.gif) . |
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| mark04usa |
Oct 18 2026, 11:00 PM
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#3
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'70 1.7 Tangerine Group: Members Posts: 370 Joined: 14-September 09 From: Austin TX Member No.: 10,805 Region Association: Southwest Region 
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The reaction from your tachometer would indicate ignition fault.
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