> I think you're onto the source of the problem with your
> compression tests. 3
> Passenger side holes at 150, 3 driver side holes at 50 tells
> me that you
> have a problem that is valve related, and since the only way
> all three sets
> of valves on one SIDE are connected is through one or both
> cams on that
> head, I'd lean towards either a broken cam, a slipped cam
> drive gear (on the
> belt), or both of them. You didn't say how many miles are on
> the engine, and
> more importantly, is it possible this engine may have been
> starved for oil?
> The reason I ask that is that my 98 (just like yours) has
> started burning
> oil profusely since I drove it from Washington state to
> Florida, pulling a
> 2-ton trailer. I now get 300 miles to the quart - terrible.
> Engines like
> these will most likely starve the cams first if the pump can't
> get enough
> oil. If the cam starves, and one of the bearings start to
> seize, I think it
> possible that it could cause the cam to slip in the belt or
> strip the belt
> or jump. I'd pull the front of the engine off, and do a timing
> check on the
> cams and timing marks. Follow that with an inspection of the
> valve train
> (remove the cam covers and see what's going on in there.
> Doesn't appear to
> be a vacuum problem - ie a damaged intake manifold gasket
> (another common
> malady on these) nor an EGR valve problem (another common
> problem). Ask your
> wife if she ran the truck out of oil. That may tell you
> It's too bad you dropped that much dough on the OBD test -
> Autozone will do
> it for free. I think you got ripped off - I had a Isuzu
> dealership do that
> for me for $35.00 before I knew about Autozone. I'm running
> standard old
> Bosch Platinum 4 plugs in mine - with absolutely no problems.
> Others have
> reported problems with non-Nippon Denso plugs (OEM version)
> but I've not had
> any. My only 2 beefs with this 3.5 l engine is the terrible
> fuel mileage for
> an engine that should easily be getting 18-20 mpg pushing a
> 4500 lb truck,
> and the 300 mpq oil consumption at 70K miles.
> Hope this helps. Sorry to bellyache about my Isuzu
> experiences, but I really
> wish I had a 3.2 engine in mine. I won't buy another Isuzu -
> this last one
> has fixed me.
> Stephen P. Reimers
> Naval Salvage Officer
> BMW Motorcycle Rider
> > Hey there. My wifes 98 trooper died on her while driving
> down the
> > road. Brought it home and tinkered with a couple things and
> > figure it out, i then took it to a mechanic around the
> corner and he
> > couldnt figure it out. I took it to the dealership and they
> said that
> > 3 things might be wrong.
> > 1.timing jumped
> > 2.camshaft broken
> > 3.head is warped.
> > The thing has never overheated. So my question is basically
> if the 3
> > driverside cylinders are not burning fuel, what could cause
> this and
> > has anyone else had similar problems?
> > I replaced the plugs (ion sensing) 15$ a pop (dealership)
> > thankyou.':roll:'
> > OBD at dealership said no electrical problems (dealership)
> > diagnostic, thankyou.':roll:'
> > Passenger side pressure on all 3 is 150 or so, driverside
> pressure is
> > 50 or so.
> > The thing starts alright, runs for 2 minutes then goes to a
> real bad
> > idle.
> > --
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> > Articles individually checked for conformance to usenet
> > Topic URL:
> > Visit Topic URL to contact author (reg. req'd). Report
> > http://www.autoforumz.com/eform.php?pX6479
I pulled the valve cover and the timing belt cover. The passenger side
was out of time by three teeth and the driver side was off by 6 or 7.
On closer inspection it looks like the rear of the engine was starved
for oil and seized the cam. Im going to take the head off and see if
my local machine shop can clean up the head, if not then im forced to
buy a reman. I called the dealership just for giggles to see what they
charge for a new full head and i snorted with amusement until i turned
blue and passed out, 1144$. I wouldnt worry about going on about your
Isuzu woes, who else would listen other than someone with the same
Thankyou for a reply, ill post again when/if i get it fixed.