Howdy Folks, First time posting here and a have a question.
Let me begin with a short story. I did the clutch on my 1986 D50 Power Ram and drove it for a while and everything seemed peachy. After about a month I am driving up the dirt road to my home and a loud knocking sound begins. It scared the living crap out of me. I parked the car for a few months as I was quite busy and just recently came back around to investigating.
My first instinct was that I had not tightened down the flywheel sufficiently and it was knockinhg against the block. I pulled the tranny and the flywheel is tight on there. My second theory was rod knock. Listened with a stethoscope and couldn't find any evidence for it. I called my buddys in for some help and my friend pulled off the air cleaner while the truck was running and the knock sound suddenly became a very loud popping sound emanating from the carburator throat. The sound occurs at regular intervals at idle at a rate of nearly one pop per second. It sounds like the noise you would make clicking ones tongue across the roof of ones mouth. If you take stethoscope and listen around the noise can also be heard at the pcv valve but if you disconnect the vacuum line to the valve the noise disappears on the scope which to me indicates the noise is travelling down the vac line from the carb to the pcv. The noise cannot be heard with a scope anywhere on the valve cover or at any of the intake ports.
I am quite befuddled. I am glad the issue does not appear to be mechanical (fingers crossed) but the noise is also acompanied by a shudder and it practically makes the vehicle undrivable.
Can any of you fine folks help me out here.
Best Regards
Walker
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