Idle Surging - Toyota Nation Forum : Toyota Car and Truck Forums

missy68k · 05-04-2005, 11:51 AM

I have a 90 4Runner SR5 with a 3VZ-E (V6 3.0 EFI). At running temp. the idle will surge when brakes are applied or the clutch is in, from 900 rpm to about 1500 rpm. Any ideas where to start would be great.
Thanks

chilli · 05-04-2005, 12:02 PM

I had the exact same thing, and it was a dead EGR valve.......when its idling like shyte, open the hood, and push down on the EGR.....if the idles settles down, your EGR is shot!

chilli · 05-04-2005, 12:02 PM

PS - mine is a 1990 v6 sr5 too

missy68k · 05-04-2005, 12:19 PM

Thanks, I'll try it & let you know if that was the problem. I hope it's that easy, I've only had one vehicle I liked better, and that was a 91 MR2.

nofear4189 · 05-04-2005, 07:31 PM

my truck does the same thing. Where exactly is the EGR vlave,and what do i have to do to check it. Like you said to hold down on it or something.

-Adam-

tr918 · 05-05-2005, 06:32 AM

Also check the PCV valve.

chilli · 05-05-2005, 12:53 PM

yup..I started by checking all vacuum lines, then moved to EGR (then would have moved to PCV)

The EGR valve (on my 1990 v6) is near the power steering reservior....if you are looking into the engine compartment, it is on the left of the engine, and it looks like an upside-down UFO (sorry for the lame description) You should see a small vacuum line running to it, and if you follow the pipe down, it enters the exhaust manifold. The valve is about the size of a baseball, and looks like an upside down saucer

If someone will host the picture for me, i have an example of the EGR valve

alex · 05-05-2005, 01:46 PM

not on the topic....but chilli...i can host for you

www.djmodifyd.com

go there to sign up

chilli · 05-05-2005, 02:53 PM

ok, signed up...will host as soon as I can

Toy Sport 4x4 · 05-05-2005, 03:35 PM

Also check throttle position sensor. It might be out of adjustment. If it not set on idle when the vehicle is at idle it will mess up fuel mixture.

chilli · 05-06-2005, 08:42 AM

Daym

I cannot login to the FTP from work.

I can email someone the pictures....gimmie an addy

missy68k · 05-06-2005, 11:38 AM

missy68k@yahoo.com. Thanks again.

chilli · 05-06-2005, 12:12 PM

pics emailed to missy

alex · 05-06-2005, 02:32 PM

here are chillis pics:

chilli · 05-10-2005, 03:07 PM

btw - my low end power increased significantly....I wonder how long my EGR was "going" before it finally hung a dump!!??!!??

Be sitting down when you price a new egr valve though.....they wanted 300+ here at my local toyota dealer (thats canadian though)

I found a used on with only 60,000 miles on it, and my original lasted 331,000 KMS, so i figured....what the hell!