5.7L engine trouble - opinions needed!  Discussion in 'GM
Powertrain' started by hihoslva, Aug 5, 2008.    1. hihoslva
hihoslva New Member      I just recently bought a '99 Suburban
with 143k miles. Very clean, runs great but has an engine
"tick".      A few days ago, I noticed the "tick" sounding like
drivetrain noise, and audible in the cabin. Unfortunately, it's
incredibly hot here in AZ, so I'm not sure if the noise has
always been there because it is drowned out by the AC fan going
full-blast all the time.      I shut the fan off briefly and
heard the ticking while accelerating. I've also done a recent
oil change to full-synthetic.      My mechanic is calling it a
"death knock", and believes the engine is on its way out. Full
diagnosis would require an expensive tear-down of course, so
he's recommending replacement at a cost of $2500-$4000
(depending on used or new engine). He also states that it's
possible the little car lot I bought the truck from had doped-up
the oil to hide the noise and it came