Hi folks,

I have a 1995 Toyota 4Runner 6cyl 4x4 3VZe engine that I have had a recurring check engine light code 71 (EGR system) coming on.

Three times mechanics have cleaned out the EGR and other parts and each time the light comes back on. Another mechanic said the EGR valve needed to be replaced. I'm a mechanical idiot but Googled how to check an EGR valve and I applied a little suction to the EGR while the vehicle was idling and it sputtered, indicating the EGR is working.

I took it to another guy who pointed out a nub (not sure what it's called) that is missing vacuum hose. We can't tell where it goes to. It's on the passenger firewall in the glove compartment. Can anyone identify what it is and whether a vacuum line should be attached and where it goes?

Any other thoughts to get this

See port that seems to be missing vacuum hose. It's on the passenger side engine compartment, towards the fender.

California car compliant would be great thx!

 

Leave it like that. There is no line on the "nub" from the factory. On the other side of the apron is a softball-sized vacuum reserve tank for the ADD.

That part of the vacuum plumbing is not on my under-hood sticker, probably because it doesn't affect emissions. You should check yours anyway (it will have the routing for the EGR).

The test you did checks the EGR valve itself, so you need to look further (probably the EGR Vacuum Modulator). Here's the FSM section: http://web.archive.org/web/201204061...77exhaustg.pdf

You probably already know this, but Code 71 is triggered by the thermistor plumbed into the side of the EGR valve. When the ECU commands the valve to open, it expects the temperature to rise as exhaust is routed into the plenum. Apparently, Toyota owners in 49 States don't get that information, but you and I are special (California).

While the EGR valve itself is susceptible to "gunk," be patient about deciding to replace any particular part. A pinched vacuum line or a loose electrical connector is almost always a more likely suspect.