airspeed Posted August 18, 2010 Posted August 18, 2010 My 88 Comanche has an intermittent stall when coming to a stop. I put my vacuum pump on the EGR valve and it is zero, no vacuum. I went and picked up a new EGR valve and on the bench it reads zero, no vacuum? Does this valve need to be at operating temperature to hold vacuum?
Pete M Posted August 18, 2010 Posted August 18, 2010 have you checked the big vacuum line going to the booster for leaks? have you cleaned the ground behind the taillight?
airspeed Posted August 18, 2010 Author Posted August 18, 2010 I can understand the vacuum leak at the booster but I'm not sure what the ground on the taillight would have to so with the EGR valve. I know there is a EGR / Evaporator Canister solenoid that should activate the EGR valve. My thought is when the EGR solenoid activates it turns into a vacuum leak at the EGR valve and kills the engine.
Pete M Posted August 18, 2010 Posted August 18, 2010 the fuel pump grounds at the same location and it's been known to hiccup when the brake lights are on. :thumbsup:
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