coolnesss Posted May 30, 2007 Report Share Posted May 30, 2007 The motor in my ETC, with 93k miles, has finally started misbehaving. The idle speed varies a small bit - noticeable only on the tach - by perhaps 50rpm or so. That has been going on for a few months. But in the last few days, on cold start in the morning, I get a hard miss that clears up in perhaps 20-30 seconds - and then the car runs great, as usual. It feels like an electric, rather than mechanical miss (hooray). It does start immediately, and gets relatively good gas mileage - 16 in the city, and I'm a fast driver. It does use oil at the rate of about 1 quart per 1000 miles. Codes are: PCM P0463 history Any ideas? The obvious first hit in my mind would be plugs and/or plug wires - but wouldn't this show up as a different code? THANKS Link to comment Share on other sites More sharing options...
Spurlee Posted May 30, 2007 Report Share Posted May 30, 2007 If it hasn't been replaced yet, check the fuel pressure regulator. There's a thread on the forum for checking it, really simple. A new one is $40 from www.rockauto.com. Scott 1996 El Dorado 2006 STS 2000 Corvette Link to comment Share on other sites More sharing options...
Ranger Posted May 30, 2007 Report Share Posted May 30, 2007 P0463 - Fuel Level Sensor Circuit High Voltage That should not cause a misfire though. Misfires that clear up after the engine has warmed up always bother me. Is your coolant level holding steady? Have the plugs & wires been changed? Link to comment Share on other sites More sharing options...
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