Please confirm. I may have my vacuum hoses backwards from my EGR solenoid to the EGR valve. On the attached picture, should the vacuum hose go from the solenoid bottom silver nipple to the EGR valve or from top black solenoid nipple to the EGR valve? Does it matter how it's hooked up? Please respond only if you are 100% sure. Additional validations are welcomed.

Many thanks!



http://f02-f03.mypicturetown.com/P2P...MTMrH/item.jpg

 

Yes it matters.

The nipple that's supposed to go to the EGR, is connected to the vent outlet when EGR is not called for, and to engine vacuum when it is. If the 2 hoses are hooked up to the wrong ports, then there will be a vacuum leak when the EGR is not called for, and the EGR valve will return to closed VERY slowly when the ECM tries to close it.

Find the port that's connected to the vent with it just sitting there, by blowing in them until you determine which one it is. That's the one that goes to the valve.

Can't tell you for sure about top and bottom or balck and silver.

 

Sofakindom, thanks. Just to be sure I understand...Do you mean that there is a vent on one of the nipples, somwhere on the sides? And when I blow in it I should feel the air coming from the sides somehow?

 

another thought, this would cause a code 32 also right? I have that code, it popped up crusing uphill at 70 mph freeway speed.

 

He means it's a function of the solenoid. With the engine off one side will hold vacuum and one side won't. The one that won't goes to the EGR valve.

 

I think I understand, then I should be able use a handheld vacuum pump to test one off the car. I just need to plug the other nipple?

 

You're outsmarting yourself. You don't need all that pump and whatever other complication. You don't have to plug anything.

Just blow in each of the 2 nipples until you find the one that's connected to the vent. Use a piece of rubber vacuum line if the solenoid is till on the car. Whichever one is connected to the vent, is the one that goes to the EGR valve. The other goes to the vacuum port on the plenum.

 

did exactly what you said on the old one off the car. When I blow in the black nipple, the air just comes out of the silver nipple. When I blow on into the silver nipple, the air comes out the black nipple. If I plug with my finger blowing in too both nipples, the air goes nowhere. So maybe the vent is plugged? Bad EGR solenoid I guess?

I have a new one in the car now that I'll try same thing tomorrow.

I tried it on another new egr solenoid belonging to a 93 camaro, different bracket, but looks like it would function the same. On that one, when I blow into the nipple with the cylindrical shaped "solenoid" directly behind it, it is plugged, the air goes no where. When I blow into the other nipple the air comes out from the back of the cylindrical shaped "solenoid". There is also a little sponge filter behind. I'm assuming this is the vent. Now thinking out loud...assuming the 93 egr solenoid functions the same as the 91, the black nipple on the 91 solenoid should be the one with the vent, and the side that connects to the egr valve. If so, then mine is plugged in backwards. Taking the day off from work tomorrow to work on the car. I believe this should now take care of my code 32.

 

Excellent....

The little sponge filter hole is the vent. So, the nipple you blew into that made air come out the vent, is in fact the one that should go to the valve.

Sounds to me like yours is defective, and the other one you have is good.

It's just a vacuum valve. No power = closed and vented, power = open and not vented. Total no-brainer. Every car that has an electric EGR valve, works the same way. There's no reason you can't use the good one you have, especially if the electric connector is the same; or if you found one off of a Toyota, a Dodge, a Frod, or even a 1939 Hupmobile, if you could hook it up, it would work the same.

 

SofaKindom, from reading my post and others, your feedback is very reliable and I value it highly. I will look out for your handle to be sure to read what you are saying.
Thanks!


I checked and my hoses were reversed. I corrected, cleared the code 32, test drove and no more issues as far as this is concerned. I am posting a new problem and hope to see your response.

thanks.

again may this post rest in peace.

 

Sorry, I had to bring it back up to say congrats and I am glad you got it figured out. Now you can bring the car out to our next SoCal meet.

 

Thanks Kevin! I would love to get out there but I still have to pass smog though. Tonight I'm taking off the plenum and checking the EGR passages, hopefully they are just plugged.