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911SC bucking when cold
This car sat for a number of years and then I picked it up. On initial startup it ran but there were vacuum leaks. After repairing the leaks the engine seemed to run pretty good except at initial startup. The car would buck the first 3-4 minutes of driving but would run fine after that. If you let it warm up for a couple minutes and then drove it, the car would operate fine. What's the likely culprit, and the best way to rule it in, or out?
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02-10-2024, 07:50 PM
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The WUR pressures need to be checked. That sets the warm and cold mixtures.
Also your AAR may be stuck. That allows more air in (with the extra fuel from the WUR) for cold starts then closes off as the car warms up. Alan
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83 SC, 82 930 (track) - Stock except for RarlyL8 race headers, RarlyL8 Zork, K27-7006, 22/28 T bars, 007 Fuel head, short 3&4 gears, NGK AFR, Greddy EBC (on the slippery slope), Wevo engine mounts, ERP rear camber adjust and mono balls, Tarret front monoball camber adjust, Elgin cams, 38mm ported heads, 964 IC. 380rwhp @ 0.8bar Apart from above, bone stock:-) |
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02-10-2024, 09:53 PM
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Ditto that. Then report your results. Next steps depending on the results.
Thomas
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1981 911 SC Coupé, platinum met. (former tin (zinc) metallic), Bilstein shocks, 915/61,930/16,WebCam20/21, Dansk 92.502SD,123ignition distributor with Permatune box as amplifier,Seine Systems Gate Shift Kit,Momo Prototipo. Want to get in touch with former owners of the car. Last registration in US was in 2013 in Lincolnshire/lL. |
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02-11-2024, 02:59 AM
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Porsche 911SC Cabriolet
2025 
Porsche 911 SC
