crummy idle
Posted: Tue Dec 14, 2021 1:16 pm
Always something, I had a small leak under my coolant elbow, so wanting to replace my defective 180 OEM T stat, installed a new version of a 160, and temps are fine. But now my engine won' idle, it just slowly dies. I have a Facet electric 24 V pump, but the pressure at my fuel pressure regulator was erratic and too low, so replaced the regulator with $200 Aeromotive, 2-5 PSI one. But my fuel pressures were still way low, and noted my clear Wix fuel filter, just before the regulator was almost dry so removed the fuel filter, plumbed the gas line to the regulator then to the carb, and fuel pressure now fine at about 3.5 psi. I did have to put some new 5/16 hoses on. I just replaced the fuel filter in the Facet, it wasn't very clogged.
But now my truck won't idle. Removed and blew out the inlet needle valve, triangular one with the Viton tip, looked fine, no debris, then found my idle screw was about four turns + out, so removed, blew it out, and re-set to one tun out. Still slowly dies at idle, exhaust is clear, no smoke. Pulled #1 plug, fine, still 120 psi compression. The engine doesn't miss, or skip a beat, just slowly dies at idle. Just took it out for a test drive, and seemed to lack "gas" when accelerating.
Background, my carb and much of my truck was rebuilt by Charles about three years, ago and I have never touched the insides since, so no reason to think the float level is off. I run only non-ethanol. The bad idle is just happening today, even with low fuel pressure, it would idle fine before,.
The only thing I can think of is some bit of fuel hose or such got into the carb, or perhaps from the fiberglass insulation of the inside of the fuel line insulator hose when I pushed the fuel line thru it. And if you guys suggest taking off the carb bowl cover, I will get some new gaskets and do that.
If a bit of fiberglass or such got into the carb where is the most likely place to look for it?
Hal
But now my truck won't idle. Removed and blew out the inlet needle valve, triangular one with the Viton tip, looked fine, no debris, then found my idle screw was about four turns + out, so removed, blew it out, and re-set to one tun out. Still slowly dies at idle, exhaust is clear, no smoke. Pulled #1 plug, fine, still 120 psi compression. The engine doesn't miss, or skip a beat, just slowly dies at idle. Just took it out for a test drive, and seemed to lack "gas" when accelerating.
Background, my carb and much of my truck was rebuilt by Charles about three years, ago and I have never touched the insides since, so no reason to think the float level is off. I run only non-ethanol. The bad idle is just happening today, even with low fuel pressure, it would idle fine before,.
The only thing I can think of is some bit of fuel hose or such got into the carb, or perhaps from the fiberglass insulation of the inside of the fuel line insulator hose when I pushed the fuel line thru it. And if you guys suggest taking off the carb bowl cover, I will get some new gaskets and do that.
If a bit of fiberglass or such got into the carb where is the most likely place to look for it?
Hal