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egr control thing
Topic Started: Feb 16 2010, 11:43 AM (589 Views)
dnantha
New Member
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I dont know what to call it, but how do you test the vacume control thing thats hooked up to the egr valve.? it has a hose comming into the bottom and sucks on a diaphram to effect two smaller hoses in some way. My diaphram works, but there is no effect on the way the air comes through the smaller tubes. Also, my EGR doesnt open when the engine runs at any speed.. The egr works when I suck on it, and all the passages are cleaned out.....Dan out.
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mwebb
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FOG

that thing that looks like a flying saucer is called a
EGR back pressure transducer

it is like a valve
vacuum from the EGR solenoid gets to one nipple on the edge , when there is enough exhaust back pressure on the center / bottom nipple , the vacuum from the EGR solenoid is allowed to pass to the other nipple on the other edge
which connects to the EGR diaphragm

if you T in a vacuum gauge to the vacuum to the EGR diaphragm then connect a long vacuum line and place the vacuum gauge under the wiper arm facing you so you can see it

do not pinch off the vacuum line when you close the hood

drive the car at cruise
there should be about 2 to 5" of vacuum present at cruise
not idle , and not WOT
if yes
everything in your EGR controls is good

if not
post your results
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Johnny Mullet
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Fear the Mullet

An easy trick to be totally sure the EGR ports are clear is to remove the EGR valave, start the engine, feel for exhaust coming from exhaust port (should be very audible) and check for suction on the other port. The other port may be clogged. Here is a diagram posted on AutomotiveForums.com by DoctorBill of the port..................

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dnantha
New Member
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What ever position the diaphram is in from the large tube on the bottom, I cant suck air from either side of the small hoses through the unit. Do I need to get a new unit? Its hell gettin old.....Dan out.
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