Originally Posted by nakman
if the timing is off, then the exhaust valves could be opening up too early? But why would that just be on one cylinder. Just a guess obviously.
On one of the Tacos we owned when I had the timing belt done the shop said my old one was off by a tooth. I didn't notice a difference though, after they corrected that.
^ That'd be my guess on the compression. Robbie, Squishy or thefatkid will hopefully chime in.
I'd guess they mucked up the tensioner. Never had that happen in any of the 5vz trucks (fam has 4 of them). Did they do anything else while they were in there?