I have a 96 Grand Am with 3.1L. I have been having an intermittent sound
like a noisy lifter. More than just a tick-tick.
I have changed oil & added Risolone and sound went away for a couple of
weeks, but then back again. This time it was on for an afternoon trip and
performance bad toward end of trip. Check engine light came on. Cyl #1
Misfire & Excessive Transmission Slip codes set. Cylinders 2-6, no misfire.
Removed some oil & added Marvel Mystery Oil. Better. Ticking for about 5
minutes, then OK. Pretty consistent, though.
Change oil after a couple of weeks again and this time a qt of CD-2.
Really great. No sound for 10 days. Yesterday though it came back when I
stopped somewhere for a few minutes and started up again. Next few starts
made noise, but went away after about 5 minutes. Then one time it stayed on
for about 15 minutes and performance was bad - low power. Didn't seem to be
missing though. No check engine light.
(1) Would noisy lifter cause performance problem?
(2) Anything else to try or check for?
(3) How much of a job to remove intake manifold & replace lifters?
Anything to be careful of / adjust? Will bad lifter be obvious (cannot
really tell by using a wood stick on various locations of engine where sound
is coming from). OK to just replace bad lifter?