That engine uses the MAP sensor reading before startup to determine BARO value. If memory serves, the EGR valve is not computer controlled. It uses ported vacuum from the base of the TBI unit. Check for leaking or plugged vacuum line to the EGR valve AND to the MAP sensor. While you're at it, check for vacuum leaks at all the vacuum fittings. The electrical connector at the MAP sensor often gets the retainer tab broken off, so check to be sure it's not loose. A "chicken band" plastic tie is a common fix for that problem. Also, you might want to remove the EGR valve and check for a plugged passage in the intake manifold. HTH Good Luck and God Bless
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Today's Featured Article - Preventing Tractor Theft - by Staff. The discussion started with the following message: I have a JD A without key start or any locking device. Is there a best way to secure it so the chances of it being stolen are reduced? Following are some of the answers that were received: Take the rotor out of the distributor and hide after each use. The would-be thieves at least couldn't just get on and drive away.
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