1989 trooper need help

This forum is for the discussion of general Isuzu related information

Moderator: Staff

1989 trooper need help

Postby jdblank » Wed Jun 23, 2021 12:42 am

i am sorry if its been posted but i cant seem to find the same exact problem.

i recently bought a 1989 Trooper and as soon as i left the sellers drive way it broke down.

so i test drove it and it seemed perfect got back payed the dude went to leave and it died, it will start and idle all day(rough idle at times) but when you hit the gas it pretty much dies, unless you let off before it does.

It only does it after its warmed up, before it is warmed up its all around a perfect running car but after about 20 minutes of running its not drivable. i have also noticed that around the time it starts acting up the fuel light and battery light come on?

once again it only does it when it is warm after about 15-20 minutes then you can only idle if you push the gas it dies or tries to.

thanks for the help.
jdblank
Drives on Pavement
 
Posts: 3
Joined: Wed Jun 23, 2021 12:22 am
Has thanked: 0 time
Have thanks: 1 time

Sponsor
 

Re: 1989 trooper need help

Postby DSUZU » Wed Jun 23, 2021 6:16 am

Probably a bad alternator. A circuit in the alternator runs the fuel pump. Alternator gets warmed up, quits charging, fuel pump quits. This is a POSSIBILITY. Running voltage should be checked first. Dennis
1991 LS Trooper 2.8 V6 5 speed conversion (Sold)
1989 LS Spacecab 2.6 5 speed 4x4 manual hubs, Rodeo torsion bars, extended shackles, 2" lift, K&N air filter (drop in), dump bed conversion, burgundy interior change, warn brush bar. Engine is bored .020 oversize and upgraded to 1994 pistons, head and EFI system.
Previously owned: 1987 Trooper II LS, 1989 Trooper (parts only), 1994 Trooper 3.2 Auto, 1997 Rodeo 2.6 5 speed, 1993 shortbed pickup 2.3 (project - sold) 1992 Rodeo 4x4 LS (parts car, devoured by Spacecab needs) plus some 70 plus other non Isuzu vehicles over the years. 1994 Amigo devoured to provide head and EFI system.
Heavily damaged by engine compartment fire while driving on March 24th 2018, condemned by insurance company and taken on March 30th 2018 :cry:.

https://forum.planetisuzoo.com/viewtopic.php?f=15&t=64060
City of St Petersburg (Fl) Fleet Maintenance 8/23/83 - 12/4/2018 (Retired). Started new job 6/4/2019. Was retired, now just tired.

If your wife has 5.00, and you have 20.00, your wife has...25.00

"Water is one of the greatest essentials of life. Without water, you can't make coffee."

Forget the "free education". Why waste time. Just give me the "FREE INCOME".
DSUZU
I am the Stig
 
Posts: 9600
Joined: Fri Mar 16, 2012 8:28 pm
Location: St Pete Florida
Has thanked: 284 times
Have thanks: 984 times

Re: 1989 trooper need help

Postby Shawn Anthony » Wed Jun 23, 2021 12:24 pm

DSUZU is ion the right track.

To test this system simply bypass the fuel pump relay so it remains on at all times. If the engine runs without issue i would suspect a intermittent alternator output or a loose/corroded/broken wire.
Shawn Anthony
Trail Scout
 
Posts: 367
Joined: Tue Dec 22, 2020 1:11 pm
Location: Northern Nevada
Has thanked: 1 time
Have thanks: 33 times

Re: 1989 trooper need help

Postby itsmehb » Wed Jun 23, 2021 12:40 pm

Bypassing the relay is accomplished by locating the relay by the underhood fuse panel, removing it and using a No. 12 wire jumper, jump the relay contacts as shown in attached pic. Clicking on the pic should make it bigger and easier to see.
You do not have the required permissions to view the files attached to this post.
1990 Amigo, 2.3 5 speed (sold)
1991 Pick up (long gone)
2000 Amigo, 2.2 5 speed(sold)
1985 Trooper 1.9 4 speed (sent back to KS)
1989 Trooper RS 2.6 5 spd. Red

We get too soon old and too late smart!

"A true soldier fights not because he hates what is in front of him, but because he loves what is behind him"

Golf is just an expensive way to play marbles
User avatar
itsmehb
I am the Stig
 
Posts: 4095
Joined: Fri Jan 14, 2011 9:39 am
Location: Flower Mound Tx.
Has thanked: 152 times
Have thanks: 325 times

Re: 1989 trooper need help

Postby Enemigo » Wed Jun 23, 2021 12:45 pm

Seems like having a few jumpers around like that could be an important part of the garage tool kit, and off-road tool kit to limp home if you need.
1999 Amigo - Sold
1999 Trooper. Mods TBD
Enemigo
Zu Royalty
 
Posts: 1294
Joined: Thu Jun 30, 2011 11:41 pm
Location: Colorado metro area
Has thanked: 7 times
Have thanks: 38 times

Re: 1989 trooper need help

Postby giusedtobe » Wed Jun 23, 2021 12:58 pm

Enemigo wrote:Seems like having a few jumpers around like that could be an important part of the garage tool kit, and off-road tool kit to limp home if you need.


True, would be nice to have.
giusedtobe
Trail Master
 
Posts: 645
Joined: Wed Jan 22, 2020 5:34 pm
Location: Knoxville TN
Has thanked: 29 times
Have thanks: 33 times

Re: 1989 trooper need help

Postby jdblank » Wed Jun 23, 2021 1:28 pm

Thanks for all the help I will definitely look into it...
my only question is if it were the alternator wouldn’t the truck eventually die completely? Do to it not charging. It will stay idling although rough at times?
jdblank
Drives on Pavement
 
Posts: 3
Joined: Wed Jun 23, 2021 12:22 am
Has thanked: 0 time
Have thanks: 1 time

Re: 1989 trooper need help

Postby Tentin » Wed Jun 23, 2021 2:28 pm

What they're saying is the circuit for the fuel pump goes through the alternator. So you could have a perfectly charging alternator but the fuel pump diode on it could be bad. So by making a jumper wire in the fuel pump relay you're bypassing the alternator circuit.

Here's a video that explains the circuit and the jumper wire
1995 Isuzu Pickup 4WD aka Suzie Q. 3" lift, 32" A/T's
1998 Isuzu Amigo 4WD aka Smeagol The Amigo. 2" Lift, 31" A/T's
User avatar
Tentin
Super Trooper
 
Posts: 205
Joined: Tue Jun 23, 2020 3:03 am
Location: San Jose
Has thanked: 0 time
Have thanks: 27 times

Re: 1989 trooper need help

Postby DSUZU » Wed Jun 23, 2021 4:07 pm

I just noticed that you just joined. Welcome. You have an Isuzu, you've come to the BEST place. Dennis
1991 LS Trooper 2.8 V6 5 speed conversion (Sold)
1989 LS Spacecab 2.6 5 speed 4x4 manual hubs, Rodeo torsion bars, extended shackles, 2" lift, K&N air filter (drop in), dump bed conversion, burgundy interior change, warn brush bar. Engine is bored .020 oversize and upgraded to 1994 pistons, head and EFI system.
Previously owned: 1987 Trooper II LS, 1989 Trooper (parts only), 1994 Trooper 3.2 Auto, 1997 Rodeo 2.6 5 speed, 1993 shortbed pickup 2.3 (project - sold) 1992 Rodeo 4x4 LS (parts car, devoured by Spacecab needs) plus some 70 plus other non Isuzu vehicles over the years. 1994 Amigo devoured to provide head and EFI system.
Heavily damaged by engine compartment fire while driving on March 24th 2018, condemned by insurance company and taken on March 30th 2018 :cry:.

https://forum.planetisuzoo.com/viewtopic.php?f=15&t=64060
City of St Petersburg (Fl) Fleet Maintenance 8/23/83 - 12/4/2018 (Retired). Started new job 6/4/2019. Was retired, now just tired.

If your wife has 5.00, and you have 20.00, your wife has...25.00

"Water is one of the greatest essentials of life. Without water, you can't make coffee."

Forget the "free education". Why waste time. Just give me the "FREE INCOME".
DSUZU
I am the Stig
 
Posts: 9600
Joined: Fri Mar 16, 2012 8:28 pm
Location: St Pete Florida
Has thanked: 284 times
Have thanks: 984 times

Re: 1989 trooper need help

Postby jdblank » Sat Jun 26, 2021 10:14 pm

Well I think that was the problem!! I put a new alternator, belt, and relay on it and besides a funny idle every now and then it runs like a top. Thankyou all for the help I really appreciate it.

For this post the author jdblank was thanked by:
MotoMike
jdblank
Drives on Pavement
 
Posts: 3
Joined: Wed Jun 23, 2021 12:22 am
Has thanked: 0 time
Have thanks: 1 time


Who is online

Users browsing this forum: djangofly and 12 guests