Engine is the "W" code Vortex. Has AT and is 4WD, has 130K miles. Just had
this thing in to have fuel leak fixed within the intake manifold. Don't know
details on what was fixed, or what exactly was leaking. Invoice doesn't show
anything beyond gaskets and shop supplies, so maybe it was just a leaking
gasket??? I know it wasn't the injector - had that done a few years ago, and
my bill was too low for that to be the problem.
It had bad mileage, poor performance, was missing badly, and smelled of raw
gas. Took the shop two times to get it done, but that problem is fixed. I
did learn that they had a new guy working on my truck, and that he left a
vacuum line disconnected when putting everything back together the first
time. That is why it took them a second time to get this fixed; they had to
completely undo everything that was done to get to that disconnected line.
Now my problem: it has a very bad knock now, and it has very low oil
pressure. The pressure was marginal at idle (15 psi), but would go up
quickly when given some gas, approaching 40 or so. The theory given to me
was that the fuel from my leak had washed out whatever gunk and other
accumulated stuff was helping the main bearings keep pressure up, now
causing this new problem. Wasn't a big deal short-term, but would have to be
On the short 3 mile drive home from the shop, the knock got very bad, oil
pressure wouldn't go up at all, and the "check gages" lite flashed on a
couple of times. Killed the engine, coasted into the driveway (it's
downhill), and am now waiting for the tow truck to show up to bring this
thing back to the shop. No way am I firing this mother up again till
somebody from the shop is present.
My question: the fuel leak causing the bearings to be "flushed" seems like a
reasonable theory, but is it actually BS? Did the new guy cause me a problem
in the bottom end somehow during his work on the top-end? I didn't have the
low pressure problem before bringing it in to have the leak fixed, and I
sure as hell didn't have the nasty knock it exhibits now. I understand the
very basic mechanics of what is going on, but have never done this kind of
work before. Helped my dad years ago with valve lifters, de-carboning
pistons and a bunch of top-end work, but never any bearing, crankshaft or
other bottom end work.
Appreciate your advice and help.
Cincinnati OH USA