Fouling issues

[Slink]

Mechanic tuned the carb and all for me, that is why I can at least get a day or two of driving out of it. He currently has the QJ and is rebuilding it. I ordered new metering rods today as the directions in the manual talk about doing for lean cruise. I will see if the rebuilt QJ does any better. I have a new mechanical pump that is a low pressure and appears to max at 5 or 6 psi. I also have swapped to E3 plugs to try and help if that matters.


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[bedwards]

That's soot. Running too rich or what plugs are you running? They don't look right.

 

[77 K20]

Perhaps a dumb question- but are you sure the choke is opening and staying open?

 

[Octane]

Hei runs best on old fashioned copper plugs in my experience.I replaced my dist. and plugs,and wires to fix mine.And as of now I've rebuilt the qjet carb. Got a brand new 40+ year old truck now! Lol

 

[Slink]

That's soot. Running too rich or what plugs are you running? They don't look right.

I’m running E3 plugs which have helped keep it running a little longer to troubleshoot and make changes.


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[Slink]

Perhaps a dumb question- but are you sure the choke is opening and staying open?

I have watched it and have not seen it close unless I’m not watching right or giving it enough time.


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[Slink]

Hei runs best on old fashioned copper plugs in my experience.I replaced my dist. and plugs,and wires to fix mine.And as of now I've rebuilt the qjet carb. Got a brand new 40+ year old truck now! Lol

I started with auto lite plugs and am running 8mm wires on new HEI distributor. I tried to go back with as close to stock as I could.


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[Octane]

I started with auto lite plugs and am running 8mm wires on new HEI distributor. I tried to go back with as close to stock as I could.


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I'm running a MSD Streetfire dist. and Taylor plug wires.On stock engine.With the qjet 4mv carb

 

[Slink]

Ok, gents don’t know if I fixed it or not will have to drive again and see. I swapped out the metering rods in the edelbrock. I went stage two lean on cruise as the manual called it. I was able to run around for over 30 minutes highway driving city driving and back road driving. At this moment it is not showing any issues.


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[bedwards]

I'd put a fresh set of plain copper AC Delco R45TS in it and run it for a 100-200 miles and post us pics then. They are the recommended heat range. I have had good luck with Accel plugs also.

 

[Slink]

I'd put a fresh set of plain copper AC Delco R45TS in it and run it for a 100-200 miles and post us pics then. They are the recommended heat range. I have had good luck with Accel plugs also.

Thanks [mention]bedwards [/mention] I will get a set and run them give it a shot.


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[Bextreme04]

Thanks [mention]bedwards [/mention] I will get a set and run them give it a shot.


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Also, just so you can see proper choke operation(and because this video is cool as hell)... here is an old GM carburetor and choke description video

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[Slink]

Thanks to everyone that has posted. After changing the metering rods out in the carb I have been driving it for a week with out any issues. Some hesitation in the throttle but I’m driving and enjoying cruising every afternoon. Thanks again.


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