And the solution is........
O2 sensor. Well...that plus the TPS sensor. After the mechanic pulled
the
O2 sensor out, it ran like a top. So, they put a new one in it, and it
still ran great. They pulled the MAP sensor out returned it, and tried to
do the same with the TPS, but apparently that was faulty too. So...TPS +
o2
sensor and it's fixed. Sounds like they also replaced the spark plugs and
fuel filter, but at 100k, I'm sure they were both needed anyway.
Thanks,
Wesley
"Wesley" <wesf@[EMAIL PROTECTED]
> wrote in message
news:sa%Bi.386$J96.107@[EMAIL PROTECTED]
> My dad's got a 1994 Isuzu Trooper with right at 100k miles on it. They
are
> getting ready to head out of town (my wife & I are as well) to the beach
in
> about a week, towing a travel trailer. Hence the urgency of the request
if
> anyone has any suggestions. Here's the story...
>
> About a month ago, they had gone on a weekend trip (towing the trailer),
and
> on the way back, started having problems with the Trooper not acting
right.
> He said when he began to press in on the accelerator after having let
off
> the gas, it would tend to jump and buck and not want to run right. It
did
> it several times, but he was able to get home without any major
problems.
> He was thinking perhaps it had something to do with running gas that has
> ethanol in it (I forget the %, but such as is common for normal vehicles
to
> be able to run).
>
> After getting home and running it solo trying to reproduce the problem,
he
> found that when he would stomp the accelerator, it would down****ft to
2nd
> gear and then have very little power. He was unable to get it to
reproduce
> the "bucking" problem.
>
> He took it to their normal mechanic, and he immediately reproduced the
> problem. Apparently their computer reader won't read a vehicle as old
as
> his, so he shorted something out to get it to give a code readout, which
> confirmed his suspicion that it needed a Throttle Position Sensor.
After
a
> week of fighting to get the part in and installed, it continued to have
the
> problem. It has also had an occasional and intermittent "check engine"
> light. The machanic managed to catch it in the act, and diagnosed it as
> needing a MAP sensor. After its installation, the problem continues.
The
> mechanic tells him that it is now acting like it is trying to flood
itself.
> Not sure if the other symptoms have changed...
>
> Sounds like they are about at their wits end as to what the problem
could
> be. The Isuzu dealer****p would be the next logical choice, but they
screwed
> him over once already. (Bought the vehicle there, they put on a new
head
> gasket before it was sold...broke off some bolts holding on the exhaust
> stuff to the engine and basically fixed it enough to get it off the
> lot...then told him he had bought it "as is" and they wouldn't do
anything
> about it). So...the Isuzu place isn't a welcome option.
>
> Any thoughts on what might be going on? The backup tow vehicle is a 93
> Trooper, with over150k...so obviously he would rather take the one that
is
> now having problems... :-)
>
> Thanks in advance,
>
> Wesley
>
>
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