Hello there. A few months ago, I posted a message asking for help with
my 92 Bonneville SE... it was losing power (alternating between
accelerating and not, but only when hot, and only under heavy
acceleration.) Anyway, I did a few more diagnostic tests.... turns out
the wires I had in there were burned to a crisp (white and charred.)
They were only a couple thousand miles old, but they were cheap. I
replaced them with a set of Bosch wires --- those worked fine for a
while, but the problem returned, though it's nowhere near as severe as
it was before.
But it's the same situation --- under load, after the engine is very
hot, when I try to accelerate heavily, the engine misfires, or
backfires, or whatever it does, just gives no acceleration except in
I've tried to see if there is a particular cylinder causing the
problem by disconnecting the spark plug wires... they keep arcing to
the body, the coil module, or whatever else is closest to the end of
I got a vacuum gauge and replaced all my vacuum hoses --- they were
glazed and cracked. Same vacuum gauge tells me there's no exhaust
restriction... and it holds steady at idle and under constant
I can feel some air moving behind the engine block, even when the fans
are off. And when I depress the accelerator mechanism, I feel more air
flow by. I verified this with a piece of tissue paper. I used a
mirror, however, and I can't find any holes (though there are plenty
of connections rusted to hell and surrounded with rings of metal.) A
few months ago, the car was giving me a lean engine code too... but
that went away after a while.
On the other hand, I don't hear the "click-click-click" noise that
should be characteristic of an exhaust leak --- at least not at idle.
At higher RPMs I'll hear something in time with the engine, and it
does get louder as the RPMS go up (at some RPM ranges, the engine
noise drowns out the noise... at others, the noise is audible.) I
can't verify if it's an exhaust leak without seeing the actual hole,
though, can I?
How can I find exactly where the exhaust is? I've tried partially
blocking the exhaust, spraying a little water in the throttle body...