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Old 12-01-2006, 01:01 PM   #12
rhandwor
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Join Date: Sep 2006
Location: Athens, Georgia
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Re: yet another surging idle problem!!!

If its throttle body injected you can try to enrich the mixture with starting fluid if it smooths out it is a fuel problem. Gun the engine while spraying if it works a lot better it is a fuel problem. The pressure regulator is under the back of the throttle body. They sell rebuild kits for them. Splice a tee in the fuel line and install a pressure gage.Better buy a pressure gage with a fitting you can screw onto the gage mounting valve. You can use fittings where it screws into the throttle body. A lot of these throttle bodies get dirty and need cleaned out. You can buy a kit like a carb. kit. I have pulled them off and cleaned all openings with carb. cleaner. Auto zones yellow can is a good one.
Gum out is about 30% of what it used to be.
The egr valve on these engines cause a rough idle when leaking. You can get on a hill and the engine shakes. Try plugging the hose to the egr with a small bolt. Also check if its leaking through. Clean it out real good and lube the shaft with spray greese. Use a vacuum gage and check that it gets vacuum when the engine is gunned. Sorry I was thinking you had a newer design engine.
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