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Join Date: Jun 2005
Location: Lititz, PA
Posts: 3
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Runs great, Then...
I have a 71 911 T... It runs great for about 20-30 minutes, then the tach jumps around sporadically and it pops and is undrivable. I replaced the plugs, wires, points, coil.... It's like a relay or something fails after the engine heats up... Any ideas? Please help... Thanks.
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06-05-2005, 10:10 AM
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try tracing the leads going into and out of the voltage transformer (what everyone on this board calls the 'coil') for non-continuity. problems with it can make the tach bounce and certainly hurt ignition. also, are you entirely sure that your points gap is set correctly? that's another potential cause of tach and driveability problems. good luck.
ryan
__________________
To the memory of Warren Hall (Early S Man), 1950 - 2008 www.friendsofwarren.com 1990 964 C4 Cabriolet (current) 1974 911 2.7 Coupe w/sunroof 9114102267 (sold) 1974 914 2.0 (sold) |
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06-05-2005, 01:18 PM
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Join Date: Jan 2002
Location: VA
Posts: 591
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Another thought. If you let the car sit for some time does it then start up and run ok until warmed up again? Early cars often have rusted gas tanks from sitting. The small flakes can collect and block the gas flow after a few minutes. Letting the car sit allows the sediment to settle and the car then starts up. Can happen at the screen in the gas tank or fuel filter.
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06-05-2005, 01:31 PM
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Join Date: Jun 2005
Location: Lititz, PA
Posts: 3
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I put in another set of points... Started fine, drove it down road and in about 5 minutes, pop bang boom dead! I engine stalled. I left the key turned to the one position and popped the hood. I noticed something interesting. The wine from the fuel pump (sounded like it was coming from the back side bottom of the engine, near the transmission) was inconsistent. It would change from high to low... I looked at the fuel filter and noticed very little fuel in it and it looked like air would push by it as the wine changed from high to low. Not sure if the fuel pump is strong when started then dies after a bit of driving... Or maybe I do have a clog that happens after gas starts sloshing around...
Any ideas or things I can test? |
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06-13-2005, 06:45 PM
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Registered
Join Date: Jun 2005
Location: Lititz, PA
Posts: 3
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I broke down and took the car to my local Porsche guru... They looked at it and came to the conclusion that the problem was in the tach circuit... When the car was acting up, they disconnected the tach an it runs fine... They were going to do more testing to see if they hook up a different tach if the problem is still gone as they were not sure if the issues was with the tach or a connection or relay somewhere... Any additional help here would be appreciated.
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06-19-2005, 06:23 PM
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1974 Porsche 911 2.7
