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Fast idle

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Posted by: suncoaster

When I start my '86 Mark VII in the morning it has suddenly stated to idle too fast (@1000 rpm). After driving it for a short time, shutting off and restarting seems to clear it up. What should I look for?

Posted by: JoshMcMadMac

1000rpm is not too fast for an idle when you start it for the first time. It will settle down if you give it a moment, or if you tap the pedal.

Posted by: Jibit

Quote:

Originally Posted by JoshMcMadMac

1000rpm is not too fast for an idle when you start it for the first time. It will settle down if you give it a moment, or if you tap the pedal.

If you still question it try cleaning the carb a little, maby something is gummed up (I'm assuming that year had a carb?, if not clean the tb)

Posted by: JoshMcMadMac

Quote:

Originally Posted by Jibit

If you still question it try cleaning the carb a little, maby something is gummed up (I'm assuming that year had a carb?, if not clean the tb)

The Mark VII's never had a carb, they are all fuel injected. Still sound advice.

Posted by: skymasteres

Quote:

Originally Posted by JoshMcMadMac

The Mark VII's never had a carb, they are all fuel injected. Still sound advice.

Very Early Mark VII's were Carburated. I think it was 84-86 on some models but I know they were doing it in 84.

Posted by: OldSchool1

You're all sort of right.
From 1984 to 1986, our cars had CFI (Central Fuel Injected) engines. There were two electronic fuel injectors in what LOOKED like a carbeurator but was actually a throttle body. See the four centrally located wires in the picture below.

Suncoaster. If you really want to do some positive work, then see: http://www.lscclub.org/tech/1984EGR.htm and clean your EGR.