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Registered
Join Date: Apr 2003
Location: Panama City, FL
Posts: 25
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Engine at Full Throttle Problem!!!
I'm looking for a little guidance on this one. I own a 78 SC with a Eurospec 3.0 CIS engine. My problem - when I am accerlerating at full throttle the engine hesistates/stumbles. I can accelerate hard without any problem as long as I walk the throttle in slowly. I had this problem about six months ago and my local Porsche mechanic/friend sent me down to get some 119 octane fuel to mix with a full tank of 93. I did do this and suprisingly the problem was gone! However since this hesitation has occured again, recently I did try the fuel treatment again and unfortanately, I still have the problem. Has anyone experienced such a problem like this with their 3 liters or have any suggestions on what my problem may be???
_________ Kurt 78 SC |
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11-18-2003, 09:05 PM
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Join Date: Dec 2001
Location: MA USA
Posts: 2,938
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I would check the ign and the fuel sys. Making sure the wires are good and the fuel pressures are in spec. Then I would adj the mixture. I would also get another mechanic
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Dean 911 SC turbo, 3.0L 930 motor, G50, 930 brakes, DTA EFI, 352 RWHP DynoDynamic dyno, |
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11-19-2003, 04:11 AM
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Join Date: Feb 2003
Location: Gladstone, MI
Posts: 271
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Check insulation around the wires carefully... (Especially grounds) Watch for exposed wire.
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Kris - '77 911S |
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11-19-2003, 06:32 AM
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Join Date: Jun 2003
Location: Camarillo, Ca.
Posts: 2,418
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I agree on the ignition wires. Check plugs cap and rotor as well.
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Aaron.  F.S. 1965 Solex engine w carbs/cleanerBurnham Performance https://www.instagram.com/burnhamperformance/ |
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11-19-2003, 06:40 AM
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Join Date: Feb 2003
Location: Gladstone, MI
Posts: 271
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Yep. Also check the ground wire from the points (pertronix, whatever). Make sure that wire is sound, and the +/- wires to the coil are good. The heat degraded/cracked the insulation on mine over time.
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Kris - '77 911S |
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11-19-2003, 07:00 AM
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Join Date: Apr 2003
Location: Panama City, FL
Posts: 25
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Thanks for the input guys. So you all seem to think it's an ignition problem? I was thinking that since it runs fine under normal loads that it would be some sort of fuel/vaccum problem but thats why I'm here asking for some help. I have checked the pressures throughtout the fuel system and it all checked good. I suppose I could see how at full throttle with the shifting of the engine this could effect some sort of ground connection. I will definately look into this later on tonight. Thanks.
________ Kurt 78 SC |
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11-19-2003, 08:31 AM
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