Carnut68

I have been restoring my 17 year old son's 94 DLX pickup 5 speed 4x4 22RE (replacement motor put in by PO) and have been chasing an EGR code over the last year. I started with the replacing the vacuum lines and checking the routing. As near as I can tell they are all good, although I have no connection to the Q port on the EGR modulator. I assume that is ok since I have not found any open vacuum port. Then I replaced the modulator, then the EGR valve and finally the EGR temperature sensor. The code 71 usually came back after a few days. Any thoughts on how I can finally get rid of it? Truck is in nice shape, recently painted with new decals about to go on, but this CEL is driving me nuts. Appreciate any advice.

scope103

I believe Q connects to the TVV for the EGR. http://web.archive.org/web/201108151...18egrsyste.pdf Hard to imagine that it would work with that disconnected.

(A California truck uses a VSV instead of a TVV.)

MaK92-4RnR

my 88 4Runner has the 3vz and it's always on too. I have a few EGR valves in the garage and kept swapping them until i found one that was decent, but the code still pops up after about 30-45 minutes of driving.

I still pass smog this way. So I said screw it. lol