tsh2014

Have had a Code 71 (EGR) for the past few months. Pulled out my EGR Valve, cleaned it; pulled my Vacuum Modulator, cleaned it. Triple checked that my vacuum hoses are not clogged and are connected properly. Reset my Check Engine light. Check Engine stayed off for around 60 miles then came back on (Code 71). Just had a rebuilt engine installed last month. The problem also existed with the previous engine. Any ideas on what is going on? Should I replace my VSV or Check Valve?

scope103

it's probably not the VSV or check valve; that just turns the EGR off when the coolant is below 48°C http://personal.utulsa.edu/~nathan-b...77exhaustg.pdf

What is the code actually saying? http://personal.utulsa.edu/~nathan-b...85diagnosi.pdf The sensor, in the pipe to the plenum, didn't get warm enough when it should have. So I would start by checking the sensor itself! http://personal.utulsa.edu/~nathan-b...00egrgaste.pdf

Next, I would just run the diagnostics (link above) on the EGR valve and modulator.

Last, when you put in the new engine, did you keep the old plenum (probably)? Over time, the plenum (and the rest of the EGR) can be clogged with "gunk." Enough gunk will keep the exhaust from entering the plenum, the pipe won't warm up enough, throws a code. You should be able to pull the EGR pipe out of the plenum (3VZE) easily; if you have to pull on it you have a cleaning job in your future.

tsh2014

Thanks, this info is helpful. I have a 1991 Toyota Pickup 4WD with a 22RE. I will check out the plenum and run the diagnostics.

tsh2014

I forgot to mention that I also replaced my temp sensor, it was all black at tip. The Check Engine light now goes on after around 60 miles after I reset it.

Punchy

You should still check the VSV, They get moisture and get stuck open and sometimes closed, WD40 into it helps break it up.
You can put 12v across the terminals and if you don't hear it click, Its stuck.


EGR VSV also opens when the ECU thinks the engine is not labored and cruising.

Sturmcrow

Does the 22RE have hardlines in the vacuum system? Myself and another fellow with the 3.0 recently had issues where the rubber vacuum lines were fine, but one of the hardlines was plugged. In my case, it would cause the CEL to light once I hit highway speeds (something the PO conveniently forgot to mention). My code was always 71.

cracker_1

I have a 89 w/ the 3.0 and frequent CEL 71. I have replaced the EGR. Have not replaced the sensor yet.. Trying to figure the exact cause before replacing more parts.