Re: Abnormal Engine Vibration Explorer LTD 2004 V6
>The dealer techs are stumped.
They shouldn't be.
I am guessing that since the dealer has done injectors and alternator that
they have put the car on the engine analyzer and checked all the electronics
and see no issues. Plugs, wires, coil packs are good, etc.
So, if that is the case, put a vacuum gauge on it after it warms up and check
the readings. You want to see a high steady vacuum on a new engine. Blips
on the gauge, a wandering gauge needle, low vacuum readings, etc indicate
probable internal engine issues. An experienced mechanic and a vacuum gauge
can tell you a lot.
Also try running a compression check and a cylinder power drop test where
they cut out each cylinder one by one, and watch the rpm drop to see which
cylinders are weak.
Guessing you are looking for an internal engine problem. I have heard of one
V6 that had similar bad idle issues and bad throttle response, and the timing
chain tensioners were bad. That person was chasing electronics all over the
place and the vacuum gauge showed an internal problem right away.
You could also have a stuck/ weak hydraulic lifter, broken rocker arm, or
other issues. Some of those are pretty darn unlikely, but if the external
stuff checks out, its time to think internal.
Post back when you get this figured out. Always fun to see if I got anywhere
close to the real issue or if I get to wear the class dunce hat for awhile.