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Posted by: nivekdodge Oct 26 2023, 09:36 AM

https://www.youtube.com/shorts/P82FcOy9scY

914 with fresh 1.8 and 123 distributor. Idle jets were swapped around , no change.
only seems to happen on #4. Notice the pooof in the barrel when it pops?

Kevin

Posted by: Superhawk996 Oct 26 2023, 10:24 AM

Timing and/or valve adjustment

Posted by: rhodyguy Oct 26 2023, 10:53 AM

Use 1 idle speed adj screw to raise the idle a bit and remeasure the flow across all 4 Venturi. The other ISAS should be off the stop. Then report back with #s. At what rpm does the ‘sneeze’ cease?. What rpm is your idle set at?

Posted by: brant Oct 26 2023, 03:42 PM

I also have seen this if that cylinder is down on compression
Do you have recent compression testing numbers?

Posted by: nivekdodge Oct 26 2023, 05:59 PM

QUOTE(brant @ Oct 26 2023, 05:42 PM)

I also have seen this if that cylinder is down on compression
Do you have recent compression testing numbers?

103 -116

Kevin

Posted by: nivekdodge Oct 26 2023, 06:00 PM

QUOTE(rhodyguy @ Oct 26 2023, 12:53 PM)

Use 1 idle speed adj screw to raise the idle a bit and remeasure the flow across all 4 Venturi. The other ISAS should be off the stop. Then report back with #s. At what rpm does the ‘sneeze’ cease?. What rpm is your idle set at?

idle around 900 airflow at 6

Kevin

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