The egr tube on my 85GT and 87GT have alot of carbon in them, Both cars have NEW OEM ac delco EGR valves, the 85GT runs smooth but gets code 32 (EGR) even though air can go through the tube can it cause the EGR code to be set? its basically the same on my 87GT 3.4L but.... that car runs rough, and has NEVER ran right scince i purchased it.

matthew

The service manual says the code is set because the EGR is demanding more than 50% duty cycle, vacumm is less than 7" and coolant temp is above a specified number (doesn't say what temp).
My 3.4 would get the code on the highway at a steady speed, that is the only time the code would be set. The entire EGR system is new, valve, solenoid, vacumm lines.
I just bypassed the solenoid and have not seen the code again.
As for carbon, that is normal, at least in every Fiero I have seen........Paul

[This message has been edited by Paul Prince (edited 10-08-2003).]

It's common to get carbon buidup in the EGR tube.If you car is throwing a code with a new EGR and you reset the computer.Theres a good chance that the EGR tube is blocked with carbon,this can happen on alot of high milage cars (just in a diffrent location).

well my tube isnt blocked, Im not sure whats setting the code, maybe ill replace the silinoid, mine just has alot of carbon in it, but i can blow through one in and it comes out the other with no restriction.

matthew

quote Originally posted by m0sh_man: well my tube isnt blocked, Im not sure whats setting the code, maybe ill replace the silinoid, mine just has alot of carbon in it, but i can blow through one in and it comes out the other with no restriction. matthew

Could be vacumm leak, solenoid, wiring to solenoid, restricted passages in manifold, coolant temp sender, ECM, even timing, or the cam profile may be a little agressive and produce lower vacumm.
The service manual has a flowchart to eliminate one problem at a time. To me it wasn't worth it, besides I am running a WCF shorty header and it may be the hole in the crossover is not big enough to let the correct amount of gas in.....Paul

this may be a dumb question, are you sure the code just isn't from when the old egr was in?

yeah im sure it wasnt from the old EGR i had the battery unhooked for about 2 days so the codes should have reset, im going to replace the silinoid today with one of my other ones and hope it fixes it.

matthew

I was looking through my Northern Auto Parts catalog (cheapest preice for a 125 automatic shift kit!) and saw something listed as 'EGR Carbon Filters' I didn't think the stock EGR had one? Would this help or aggravate a problem like this?