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Need help diagnosing K-Jet intermittent poor idle / loss of power B21F 200

posted by  billy242 on  Thu Sep 2 08:07 CST 2010
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last visit: Wed Sep 8 05:10 CST 2010
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Ok, to the point: 1980 242 DL daily driver, B21F, K-Jet, M46 trans, mileage unknown but very high.

Just recently (within the past 2 weeks), the car has developed an intermittent power loss while driving, and also a poor idle quality. Car seems to idle/run just fine for about 5 minutes, then the car begins to lose power. Acts as if you are trying to accelerate from 25mph in overdrive but without the shuddering. Will barely rev to 4,000 rpm, and will only do that very unwillingly. If I shut the car off and leave it for a few hours, it will start up and run just fine for 5 minutes or so before the power loss returns. Rarely, the loss of power and poor idle will resolve itself while driving, only to return very shortly. When the car runs poorly, the coolant temperature will go up slightly, indicating that perhaps the fuel mixture is going lean?

Anybody have any clue as to what's going on and where I should begin to look for the problem? Since it's my daily driver and I am scheduled to make an 800 mile trip with this car in a few days, it's imperative that I figure out what's going on and get it fixed. Not fixing it could make for a miserable trip, providing I even reach my destination...

billy242






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