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I can hear the ticking sound with the stethoscope where the downpipe meets the exhaust pipe (although I believe this is just the residual sound coming from somewhere else)


I think you've located your problem... exhaust leaks are almost ventriloquist like....

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This does seem the most likely explanation, however...

The 22R fuel pump can be VERY noisy. I was absolutely shocked when I replaced mine recently at how much quieter the new one is. Mine still pumped just fine, although the one way valve was shot.


I know when I had an exhaust leak, it was much much more noticeable when the truck was cold, before the metal expanded and sealed the leak somewhat.

My Truck: 1987 XtraCab DLX 22R 4WD 5 Speed Manual
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"Speed has never killed anyone. Suddenly becoming stationary, that's what gets you." -Jeremy Clarkson