1989 Isuzu Trooper Problems
lou...@louigi.com
130,000 miles)
Problems:
Driving and for no reason, the vehicle dies. Will not start for about 45
minutes. It does show spark when trying to start it. No specific
weather or road condition. Isuzu Dealer could not find problem because
it is an intermittent problem. This has happened 5 times now.
Dealer stated it could be the coil, computers or fuel pump (in fuel
tank). I replaced the coil and still encountering the problem. I noticed
today, when I encountered the problem that the
Fuel Light
O2 Light
Battery Light
Brake Light
on the dash remained on after it started up. I continued home (approx.
10 miles) and it ran fine.
I hate having to replace the fuel pump (approx. $500 including labor)
when it might not be the problem.
Please e-mail me with suggestions and thanks…
Chris Valliant
rusty and don't conduct properly. Once you drop the tank, you will be
able to check the connections and see what they look like. Or you
could wait till it stalls and see if you are getting any fuel. But a
dealer should be able to find the problem. We see them on a regular
basis. But it's not always fuel pumps that go. I have seen relays for
the fuel pump go as well as just a few bad wires at the back end. Take
it back to them and tell them to find out whats wrong with it. That's
what they get paid the big money to do :)
Chris
Jef1
>130,000 miles)
>I hate having to replace the fuel pump (approx. $500 including labor)
>when it might not be the problem.
That's close to the mileage my 88 Trooper had when the fuel pump went south.
It, too, started as an intermittent problem. It's not too difficult to replace
yourself. Just empty the fuel tank, disconnect the wiring and hoses from the
top of the tank, and remove the mounting straps. Then you only have about ten
screws to remove from the top of the tank, and the entire fuel pump assembly
lifts straight out. Reassembly is the reverse. Hope this helps.
Jeff
mark west
I have a 90 4WD PU, 4 cyl (4ZE1), 5 spd, space cab, with 130,000 miles. About
a year ago, I was driving it and the fuel light, O2 light, battery light, and
brake light came on. The truck ran fine on the short ride home. After I shut
it off, it would not restart (only ran for a second). I have the factory
electrical manual and found out that there is a "charge relay" that turns on
these lights when the alternator is not charging. When the alternator is
charging, it fires this relay which turns off the lights and provides power to
the fuel pump relay. It also turns out that if the truck starts and has oil
pressure, the alternator can quit charging which causes the charge relay to
turn on the lights and not provide power to the fuel pump relay, but the fuel
pump relay will stay energized through the oil pressure light as long as there
is oil pressure.
My problem turned out to be simple. The alternator belt had broken, so there
was no charging, the lights came on (fuel, O2, batt, and brake), the fuel pump
relay stayed energized through the oil pressure light, and I got home. It
would not restart because the alternator was not charging, and thus not
switching the charge relay, which did not switch the fuel pump relay. Since
there is no oil pressure while the engine is not running, the fuel pump relay
was not being energized through the oil pressure light. I hope this is not
too complicated. It would run for one second at startup because the fuel pump
is directly energized when the key is in the start position.
The bottom line for you is that when these lights all come on at once, there
is some kind of no charge condition. The charge relay may be bad or the
alternator may be bad. It may be as simple as a loose alternator belt. It
could also be the fuel pump relay. In my PU, the relays are located under the
hood in the main relay box on the passenger side. If I were you, I would
check the charge relay, fuel pump relay, alternator belt and alternator.
Mark West
Indianapolis, IN
In article <35E3A6...@louigi.com>, lou...@louigi.com wrote:
>1989 Isuzu Trooper (4 Cylinder, Fuel Injected, Air Conditioning with
>130,000 miles)
>
>Problems:
>
>Driving and for no reason, the vehicle dies. Will not start for about 45
>minutes. It does show spark when trying to start it. No specific
>weather or road condition. Isuzu Dealer could not find problem because
>it is an intermittent problem. This has happened 5 times now.
>
>Dealer stated it could be the coil, computers or fuel pump (in fuel
>tank). I replaced the coil and still encountering the problem. I noticed
>today, when I encountered the problem that the
>Fuel Light
>O2 Light
>Battery Light
>Brake Light
>on the dash remained on after it started up. I continued home (approx.
>10 miles) and it ran fine.
>
>I hate having to replace the fuel pump (approx. $500 including labor)
>when it might not be the problem.
>
Peter D. Hipson
the relay wsa bad (a short blew it!) If your truck is not fuel
injected (mine is carb) then the main problem is that things don't
work (like in my case, the heater!) adn all those lights come on.
WILLREED
ground wire on the computer was shorting causing the exact same problems. You
may have them check it out. I went through two fuel pumps and alot of mechanic
diagnosis until I found a old mechanic that went through the wiring harness.
Good luck!
Ed
--
Ed
"The longer I live, the more I learn. The more I learn, the more I
know.
The more I know, the more I realize how little I really know!"
Jim Rojas
are all primary negative to ground inputs. It does make sense. If a dead
short (GROUND) is going into the computer. It is taking it as a extreme
case, lets say the particular input short means not enough gas or too
much air or even low vacuum pressure. This will throw everything off
whack.
Jim
cochra...@gmail.com
> 1989 Isuzu Trooper (4 Cylinder, Fuel Injected, Air Conditioning with
> 130,000 miles)
>
> Problems:
>
> Driving and for no reason, the vehicle dies. Will not start for about 45
> minutes. It does show spark when trying to start it. No specific
> weather or road condition. Isuzu Dealer could not find problem because
> it is an intermittent problem. This has happened 5 times now.
>
> Dealer stated it could be the coil, computers or fuel pump (in fuel
> tank). I replaced the coil and still encountering the problem. I noticed
> today, when I encountered the problem that the
> Fuel Light
> O2 Light
> Battery Light
> Brake Light
> on the dash remained on after it started up. I continued home (approx.
> 10 miles) and it ran fine.
>
> I hate having to replace the fuel pump (approx. $500 including labor)
> when it might not be the problem.
>
> Please e-mail me with suggestions and thanks…
>
> lou...@louigi.com
My 88 trooper II had the same thing happen and if you will replace your engine relay that will solve your problem. Good luck.