EGR Valve Question

[Pmcb]

I just replaced the EGR valve and CTS, this fixed the very hard start problem in my 87 GMC V1500 350TBI. But the EGR that I got did not have the EGR number of the one I replaced listed so I could not add the correct spacer to match the existing one. Though it starts much better, it misses until warm and is throwing a 22 code and 33 code.
How can I know what spacer to use for the EGR? I am running no spacer now and thought of just trying a few?

 

[gmbellew]

I just replaced the EGR valve and CTS, this fixed the very hard start problem in my 87 GMC V1500 350TBI. But the EGR that I got did not have the EGR number of the one I replaced listed so I could not add the correct spacer to match the existing one. Though it starts much better, it misses until warm and is throwing a 22 code and 33 code.
How can I know what spacer to use for the EGR? I am running no spacer now and thought of just trying a few?

you don't need an EGR spacer that I am aware of. but there are different EGR valves that work on positive or negative pressure. it is critical that you get the correct application for your year/engine and I would get an AC Delco one to make sure it is correct.

 

[Pmcb]

Thanks, I did order a Delphi that is listed on several sites as the correct one.. The one I got was from Auto Zone that they said was for my truck. It came with a bag of what I called spacers, they are washers with different size openings each marked with a number. You are supposed to find the number from your existing EGR and there is a list that shows which number washer to use. Unfortunately the number on my old EGR was not listed. Hopefully the new one will be the correct one.

 

[gmbellew]

here was the post from my lesson learned on the EGR. it has the Delco part number.

EGR Replacement - make sure you get a Delco

I had a high idle and surging issue after getting off the highway and/or long drives. I would also occasionally get EGR check engine light codes. I finally pulled the EGR, and it didn't seem to be in good shape. seems it is probably lazy closing after being open for extended periods of time. I...

www.gmsquarebody.com

 

[Pmcb]

Thanks for the information. If the Delphi does not work at least I know what to go to.

 

[fast 99]

That is one part that should be Delco or GM. Those one size fits all EGR's aren't worth the box they are in.

 

[pinballlarry1]

sounds like you are referring to a selection of different sized orifices to regulate how much exhaust gas recirculation is allowed when the valve is opened. You need to measure the passageway opening size of the old valve and install the closest size orifice wherever it is meant to be installed.