alil2cul4u

hey guys, I was wondering if there is anyway to test an EGR valve? I have a 90 4runner with a 3.0 and have been having problems with it stalling out at higher speeds around 3500 to 3700 rpms and I'm just wondering if it is my EGR valve and if i can pick one up from a yard and test it? I have searched and searched on here and google, can't seem to find anything on testing one!
Would a bad EGR throw any codes? I havent got a CEL since my O2 sensor. And as far as I can remember thats the only code i've ever gotten.

TIA
Julian

myyota

A lot of people here have blocked off the EGR on the 3.0 and have said they gained more power and a better running engine. Do a search and you should be able to find the information on this.

alil2cul4u

Thanks, but i read somewhere that it has to be retimed after?! I dont know how to do timing nor do i have a timing gun! I would like to do that if the I didnt have the timing issue. I also remember seeing on one of them that it can cause problems with combustion and I would have to run higher octane?!?

abecedarian

Can you be a little more specific about the problem? Does it happen if you floor it and hit those RPM's? When it dies, I assume you're getting a the check engine light, right? Have you tried pulling codes?

If the EGR valve were stuck open, the truck would run like crap at idle, if it ran at all. And above 1500 or so, there's enough air flow to keep the engine running even if the valve were stuck open.

But if you wanted to test the EGR valve, the easiest thing to do is start the engine then apply vacuum to the hose that leads to the EGR diaphragm. It doesn't take much vacuum- I can actuate my 22re's EGR by sucking on the hose really hard (I know, bad visual). If the engine starts to sputter and die, the valve is most likely working.

rpl

Is your cel on? If you jump codes does I give back code 71? There is a list of steps to test the egr in the fsm. Mine turned out to be a stuck vsv vacum switch. Bout a used one on eBay and swapped them out.

vandert

Even if your EGR is broken you might not throw the code - mine didn't just FYI, easiest way to test is to pull the vaccum hose as mentioned above

I removed mine and picked up mileage, better idle, and alot more midrange but mine had been stuck open for god knows how long, now I need to rerun some Seafoam through it to clean out the intake manifold.