My 87' 5L, they're hangin above the valve cover, close to the firewall, driver side.

 

on my 93 they r next to the ignition coil, 2 square and one round the round its for EGR valve

 

Exactly.........

 

just looked and they are both hooked up. any other ideas?

 

Well, at normal op temp, check for vac on their intake side. Maybe the other end isn't connected. That aught to be worth 2 psi of Vac! Also, disconnect their harnesses and observe engine response. Then, maybe check for power at the harness. They're so seldom problematic, not sure what voltage amount to look for. which is why a Vac leak, including the other end of their vac hoses possibly not being connected, is a good bet. Have you inspected your Vac tree (manifold)? They many times have rubber cap offs that rot & leak! That plastic Vac tubing becomes very brittle over time. Look for breaks or cracks. It's kinda like "Where's Waldo", except your lookin for 2 psi of Vac pressure. Also, only finding 2, isn't a good sign! I have 3 in a row. Also, as I mentioned previously, a ruptured EGR valve Vac diaphragm would pretty much explain the majority of you maladies!

 

thanks a lot. We are pulling the intake manifold off tomorrow to see if i have a stuck open injector so i will look for the egr vac diaphram while that is apart.

 

I noticed the smog system was different on the '92 motor I used in my truck. One solenoid for the thermactor and one for the EGR, his is probably the same.

 

Not surprised! Any idea what the 3rd one on mine does? In fact, I've tried to trace all the vac lines down, but they all disappear behind the manifold and less come out, so I know some must end up at the Vac tree. Not sure which ones. Most (all) diagrams I've seen are greatly lacking in detail.

 

The smog pump valve located near the alternator is controlled by the two solenoids. One is the diverter and one is the bypass. I don't know exactly how they work without refreshing my memory (book is not within grasp) but the valve directs the air either in the exhaust near the head or in the exhaust near the catalytic converter. The bypass just bypasses it when the air shouldn't go to either place. The newer engine I got only had air directed near the cat, no holes in the head for the air injection pipe like ours.

My engine label is pretty clear, plus I've just had it apart to see where all the vacuums run. Don't ask me to describe it though, it's that darn memory thing again.

 

k so heres what happened. egr valve had no vacuum attached.Same with the fumes canister was disconnected. Same with the thermactor. Changed the injector over to the easy side and just checked that plug and its black. all others are clean now. So replacing that today and hopefull it will make a big difference.