Hello all,

Looking for a little help if anyone has run into this. I have a 1989 4runner, 22RE. I'm not getting good flow from my egr to my egr modulator. The line from the EGR is not supplying enough back pressure from the exhaust to fully open the EGR modulator, to connect ports P and R to port Q and open the EGR fully. The line to port P will get great vacuum pressure from the intake, but when going thru the modulator to Port Q the vacuum is less then 1/2. This tells me the modulator is not fully opening. The modulator and EGR both have been tested and work fine. The Engine is a brand new Yota 1 motor, so compression is not the issue.... Air leak somewhere? I've replaced 80% of the vacuum lines with quality lines from 22RE Performance. I know the answer is the delete the EGR, but I'm in Ca so that's not a solution. Any help would be appreiciated.

 

If you apply vacuum to the EGR at idle does the engine stall out, or at least starting running badly?

 

Yes, engine stumbles to almost stalling, but does not acutally stall. I've already removed the egr valve and cleaned it throughly and tested it. I was holding vacuum so I'm assuming it was working.

 

Not much to the system. There is that thermal valve towards the front.its easy to break, has anyone ever tried to glue it back together? Could have restricted or blocked a port

 

Thanks, Yeah I replaced the TSV valve by the intake, that connect the EGR and the EGR modulator. Just not getting enough pressure from the exhaust to full open the modulator and connect ports P and Q. Frustrating....

 

Here's some info from a Toyota Emissions training class manual back in the 1980's. sorry for the large size. In a hurry to make a movie

 

What kind of movie are you making? 😉