Video: location of EGR valve 1987 corvette

[rikkilee2000]

We are trying to locate the egr valve on a 1987 corvette to see if fit can be cleaned or to replace it however our haynes book is not giving a description. code 32. Any help would be great.

Thanks,
Rick

 

[rikkilee2000]

We have located the egr valve. The vacuum line going into the egr showed no vacuum at idle. Is there a solenoid vacuum valve that regulates vacuum to the egr? the Haynes manual says there should be 10 pounds at idle,

 

[slovetteman]

We have located the egr valve. The vacuum line going into the egr showed no vacuum at idle. Is there a solenoid vacuum valve that regulates vacuum to the egr? the Haynes manual says there should be 10 pounds at idle,

I have two "images" that should be helpful...but I have not uploaded to my web space as of yet....let me know your direct e-mail address and I will send them to you. Send me a private message so your e-mail address is not blasted to everyone.

Regards,
JT

 

[boomdriver]

We have located the egr valve. The vacuum line going into the egr showed no vacuum at idle. Is there a solenoid vacuum valve that regulates vacuum to the egr? the Haynes manual says there should be 10 pounds at idle,

The EGR solenoid is bolted the the thermostat housing/water neck. The vac line to the EGR can be damaged, OR the vac line to the solenoid. The line originates under the throttle body, runs to the solenoid then to the EGR valve. The line MUST get its vac from where it is. Thats ported vac and has different levels than the more common plenum/manifold vacuum.
Your emissions sticker on the driver side of the radiator shroud will diagram the vac layout and hose routing.

Its in your best interest to relocate the EGR solenoid to a bolt on the backside of the AIR pump or plenum so the vac lines are accessable in the future.

IF you need to buy a new EGR valve, be certain to get the correct model....there are pos or neg pressure EGRs, and the wrong type won't operate correctly. You will have to pull the plenum (not runners) to access the EGR if its got to be changed. Use a mirror under the edge when you apply vac to the right hose going to the EGR valve. It does not take much at all to make the diaphram move and that can be seen in the mirror. If its not a leaking vac line, its most likely the valve itself. Solenoids are too simple....
You'll need new plenum gaskets if you try to swap EGRs...AND some good small wrenches to get to one of the 2 egr bolts...one has P.P. access with a wrench.:ugh

 

[rikkilee2000]

Thanks boomdriverand slovetteman for you helpful post. I’ve been out of town and will bestarting up the project again sometime in the near future.

Thanks again,

Rick

 

[vetteoz]

The vacuum line going into the egr showed no vacuum at idle.
the Haynes manual says there should be 10 pounds at idle,

You miss read ,
there should be vac on the supply line to the EGR solenoid as shown in diagram below; not the valve itself
EGR valve is not open at idle so there should be no vac on line between EGR solenoid and valve unless solenoid is faulty.
EGR only operates under certain specified conditions when car is in motion

 

[vetteoz]

Also code 32 shows a fault with the EGR system; not necessary that the valve itself is faulty.
Code 32 ;A EGR failure will set this code.
Either a malfunctioning EGR valve, a malfunctioning EGR temperature switch, an open or short to ground or the egr control solenoid.

When the egr solenoid is operating properly, the ecm will activate it, allowing vacuum to open the egr valve, this in turn will allow the hot exhaust gases to circulate through the egr valve, and the egr temp. switch will heat up until it reaches its activation temperature, it will then close and send s grounded signal back to the ecm telling it the conditions have been met.
If the switch is closed on start up or does not close when the operating parameters are met, this code will be set.

It is possible ( and very common ) the EGR temp switch is faulty or has a bad connection so it does not indicate to the ECM that the EGR is working.Check the wiring to switch located in the crossover tube on pass side from exh to intake rear.

Explore all possibilities before dismantling intake to install new valve only to find it does not solve problem

Read the fault finding diagnostics from the factory manual
http://members.shaw.ca/corvette86/Code 32.pdf

http://members.shaw.ca/corvette86/EGR