92 5.8 Engine racing at startup
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92 5.8 Engine racing at startup
I have a 1992 E250 RV with a 5.8 engine. When I start the engine cold it races very high. I don't have a tach on it, but it sounds like 2000 RPM or so. If I crimp the vacuum line from the intake manifold to the EGR valve, it drops to a slow idle. After it warms up, it drops to a normal idle.
Since it works okay warm, it doesn't sound to me like the valve is bad. It sounds like a control problem. I know there is a vacuum solenoid and a position sensor.
Any help diagnosing the problem would be greatly appreciated.
Since it works okay warm, it doesn't sound to me like the valve is bad. It sounds like a control problem. I know there is a vacuum solenoid and a position sensor.
Any help diagnosing the problem would be greatly appreciated.
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I scanned the codes and received a code of 28. This was either KOEO or a stored CM code. I did it manually and was a little confused about which it was. The table I found listed this as a VAT problem. The only VAT I am aware of is on Turbo engines. Of course, I don't have one. Anyone have a better list of codes?
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