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Originally Posted by lee
I use Alldata, and they state to check the EGR function one should apply about 8" vacuum to the line going to the EGR. The result Alldata describes is the engine should stumble, but the vacuum should hold steady. When I test my EGR I can't get the vacuum to hold, so I'm wondering if I have a leak. I can pump away and feel the EGR valve moving in response so the valve itself is at least partially OK - I just don't know if the alldata info is right.
So, could someone with a FSM check the section on EGR function testing and let me know if the Alldata info is correct?
tia
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Gidáy Lee, the manual does not give this info.
The line that runs from the EGR solenoid, to the EGR valve, also goes to the BPT valve (thats what the book calls it, don't know what it means), this unit modifies the amount of vacume that is applied to the EGR, in accordance with the gas pressure that is in the exhaust manifold. This unit bleeds air from the throttle body, into the vacume line. So you won't be able to hold a vacume level in the EGR line.
Harvey.
