1992 Chevy S-10 EGR valve

LEE STANLEY

MEMBER
1992 CHEVROLET S-10
4 CYL
2WD
MANUAL
143,000 MILES

2.5 4 cyl. Replacement EGR valve came with several rings that I suppose are designed to resrtict flow as the holes in the centers diminish in size. Question: Which is the right one? With no rings, vehicle stutters while trying to sustain one speed. So far, I have put in the largest and am working my way towards going towards the smaller until I got smooth perfromance. Trouble is, by doing this, I have to wait until everything is cooled down to disassemble to put in the next lower size. At this rate, the truck will be a classic by the time I figure it out! LOL! Thanks!

1 Reply

WMPBROWN

MEMBER
17 POSTS

If you still have the old ring, compare the new ones to it.
The next part is hard to do, but posible - Does require "smoke and mirrors"
You'll need a strong flashlight, a pen light will work, a dental mirror or a small shaving mirror.
Your best friend, with a some time to trade for a couple beers afterward.
2 1/2" bolts or screws that each fit tight into the holes of the new rings.
Plumbers tape
Shine the flashlight into the valve hole, hold the mirror so that you can see the "bottom" of the hole.
You can hold the bolts up to the mirror where the hole is seen and "match" the diameter
Or
Carefully slide eade each bolt into the hole, starting with the smallest diametr bolt. When you get to the bolt that doesn't go as far as the previous, you have the "correct" size.

You are now down to 2 rings to use. The last bolt you used and one before it. Start with the larger of the two.

Check that the sealing "wax" is not stripped from the threads on the EGR valve, if it has been rubbed off, wrapp the plumbers tape one time around the threads with an overlap of about 1/16 - 1/8 inch, the "top" flap should face left or the opposite direction of tightening.
If the ring goes into the valve seat before the EGR valve, make sure it's sitting flat. If it sits on the EGR then goes into the seat don't let it drop or get bent before putting the ER on.
Make sure you have the EGR Valve Gasket too.