carb high idle leak vacuum egr carburetor (1 Viewer)

Joined
Dec 21, 2008
Messages
311
Location
Oregon
For those troubleshooting a high idle, here is my experience...in summary.

High idle fluctuated from \900 - 1100

I continuously tried to locate and fix vacuum leaks, but the did not drop the idle. Yes, I adjusted idle speed screw, fuel mixture, timing, etc.

I finally tried tapping on the egr valve with a large screwdriver and like bingo, the idle dropped down.

I haven't replaced the valve yet. I pulled it off and cleaned it up with brake cleaner (being careful not to get any in the diaghram side of things), and then applied some silicone and graphite powder to the shaft inside.

It still has the sticking issue, and so for now I just disconnected it from the modulator. And it runs great.

lesson learned: check for leaky egr valve during idle troubleshooting. A solid tap with driver should seat the valve.
 
Joined
Nov 26, 2004
Messages
2,465
Location
Texas
 
 
 
Hey Pete,

I had luck spraying Seafoam in my EGR valve to help with it sticking. It's been working good after 2+ years.
 

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