Strange exhaust "note"
#1
01-30-2019, 08:46 PM
Strange exhaust "note"
Background info: 72 F100 with 302....truck sat for several years before I bought it. Fresh carb and all new ignition components. Timing and air/fuel are set. I'm noticing a strange exhaust sound that is only on the driver's cylinder bank. Any ideas? Doesn't exactly sound like a misfire, but doesn't sound "right" either. Take a listen:
#2
01-31-2019, 02:48 AM
#5
01-31-2019, 04:11 AM
#6
01-31-2019, 07:00 AM
Yeah I've been reading up and looks like a valve could be sticking. I'm gonna try the piece of paper over the end of the tailpipe trick tonight and see what it shows.
#7
01-31-2019, 09:20 AM
That's kinda what I was thinking. Try some Marvel's in the crankcase and fuel tank according to directions on the jug. It works slick as hell for sticky lifters or valves, it can't hurt to try it. Should notice an almost immediate improvement if this is the case. Old stale gasoline turns to varnish, sticking rings and innards that are supposed to move.
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#8
01-31-2019, 10:24 AM
#9
02-02-2019, 12:36 AM
Lead Driver
Have heard that sound many times. Unfortunately it could be many things too!
The simplest and most common (for my personal episodes) was simply carb adjustments. The idle-air mixture screw needed to be tweaked on that side. Or both sides, once you start that back-and-forth dance of carb tuning.
Exhaust leaks are another potential culprit. Inspect the whole system closely to be sure there are no rust holes or loose joint clamps. Pay particular attention to the exhaust manifolds and look for cracks. There was a slightly funny sound up at the engine compartment too I thought. But microphones pic up so much it's hard to tell from here.
Another one, as mentioned, is firing order, but since you checked that you could still have a mis-fire due to a bad plug, or plug wire, or distributor cap, or whatever.
And last thing that I can think of right off the top would be a vacuum leak that's effecting only that side, or mainly that side. Spray your favorite "vacuum leak checking liquid" around all the usual areas to see if one shows up.
Good luck.
Paul
The simplest and most common (for my personal episodes) was simply carb adjustments. The idle-air mixture screw needed to be tweaked on that side. Or both sides, once you start that back-and-forth dance of carb tuning.
Exhaust leaks are another potential culprit. Inspect the whole system closely to be sure there are no rust holes or loose joint clamps. Pay particular attention to the exhaust manifolds and look for cracks. There was a slightly funny sound up at the engine compartment too I thought. But microphones pic up so much it's hard to tell from here.
Another one, as mentioned, is firing order, but since you checked that you could still have a mis-fire due to a bad plug, or plug wire, or distributor cap, or whatever.
And last thing that I can think of right off the top would be a vacuum leak that's effecting only that side, or mainly that side. Spray your favorite "vacuum leak checking liquid" around all the usual areas to see if one shows up.
Good luck.
Paul
#10
02-02-2019, 07:17 AM
Have heard that sound many times. Unfortunately it could be many things too!
The simplest and most common (for my personal episodes) was simply carb adjustments. The idle-air mixture screw needed to be tweaked on that side. Or both sides, once you start that back-and-forth dance of carb tuning.
Exhaust leaks are another potential culprit. Inspect the whole system closely to be sure there are no rust holes or loose joint clamps. Pay particular attention to the exhaust manifolds and look for cracks. There was a slightly funny sound up at the engine compartment too I thought. But microphones pic up so much it's hard to tell from here.
Another one, as mentioned, is firing order, but since you checked that you could still have a mis-fire due to a bad plug, or plug wire, or distributor cap, or whatever.
And last thing that I can think of right off the top would be a vacuum leak that's effecting only that side, or mainly that side. Spray your favorite "vacuum leak checking liquid" around all the usual areas to see if one shows up.
Good luck.
Paul
The simplest and most common (for my personal episodes) was simply carb adjustments. The idle-air mixture screw needed to be tweaked on that side. Or both sides, once you start that back-and-forth dance of carb tuning.
Exhaust leaks are another potential culprit. Inspect the whole system closely to be sure there are no rust holes or loose joint clamps. Pay particular attention to the exhaust manifolds and look for cracks. There was a slightly funny sound up at the engine compartment too I thought. But microphones pic up so much it's hard to tell from here.
Another one, as mentioned, is firing order, but since you checked that you could still have a mis-fire due to a bad plug, or plug wire, or distributor cap, or whatever.
And last thing that I can think of right off the top would be a vacuum leak that's effecting only that side, or mainly that side. Spray your favorite "vacuum leak checking liquid" around all the usual areas to see if one shows up.
Good luck.
Paul
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