Question about 1991 Isuzu Rodeo

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There is no power getting to the injectors in my 91 isuzu rodeo V6 throttle body injection. i have replaced the ECM,fuses,relays even got new injectors still cannot get my injectors to turn on

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Hi there, Joel here 20 year master mechanic. For the faulting to the injector pulse and power, the control mod in the distributor controls fuel and spark. You're going to have to replace the control mod. I believe AutoZone carries these at 26.99 p/n DR126. Hope this helps.

Posted on Oct 28, 2010

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I have a 1991 Isuzu Rodeo with a V6. When I take the air cleaner off I can see gas leaking from some sort of modulator or something just to the right at the very top.


which engine?
The V6 , it has a real name.
there were 3 v6s used.
what displacement?
sounds like the 3.1L GM V6, not the isuzu 3.2. (2 kinds too)
The GM is the LG6 engine, GM name.
the last carb car , in USA was ISUZU, in 1994.
and before that some very odd , electric carbs. (avoid those)
in 1991
there were 4 engine (1 I4 and 3 V6)
ONLY the 2.3L 4 banger was carb , 2 barrel;
the 3.1L is and was, TFI , so is NOT A CARB.
This TFI has a Real ECU, (EFI system)
and the injector does have seals and can leak.
buy a seal kit and put it in,.
TFI means throttle body injected, x2 in this case
the book shows how to do this, (at mitchells) log in, and read?





26382782-fowge5wdi4z1kklxkflgc2ic-2-0.jpg

26382782-fowge5wdi4z1kklxkflgc2ic-2-1.jpg


the steps. are clear.
he engine is equipped with 2 fuel injectors; both are located in the throttle body.
  1. Relieve the fuel pressure. (ask)
  2. Disconnect the negative battery cable.
  3. Remove the air cleaner.
  4. At the injector electrical connectors, squeeze the 2 tabs together and pull them straight upward.
  5. Remove the fuel meter cover and leave the cover gasket in place.
  6. Using a small prybar, carefully pry the injectors upward until they are free of the throttle body.
  7. Remove the small O-ring from the nozzle end of the injector. Carefully rotate the injector's fuel filter back-and-forth to remove it from the base of the injector.
  8. Discard the fuel meter cover gasket.
  9. Remove the large O-ring and back-up washer from the top of the counterbore of the fuel meter body injector cavity.

Dec 03, 2016 | Isuzu Cars & Trucks

1 Answer

Have a 1990 isuzu trooper 6 cylinder throttle body need wire color codes to replace injector connectors


t
that is a very old car.this.

no you do mean it has 2 injectors, be nice to say "I have the 2 injector engine" a TBI injected engine .
its the 2.8L v6?

here it is, log in to mitchell's diy and read>?
first is 4 banger.

26297084-u1skeagojbjhu3ucj4o4k3kf-1-0.jpg the 6cylinder with 2 injectors TBI its called.
throttle body injected. so the blue/black wires are 12v power.
and the 2 injectors fire, blue and green. ISC valve on right.

26297084-u1skeagojbjhu3ucj4o4k3kf-1-1.jpg

Oct 01, 2016 | Isuzu Cars & Trucks

1 Answer

I have a 1990 chev silverado that won't start has fuel pressure has spark injectors won't inject changed injectors could the throttle position sensor being bad cause the injectors not to work


No. If it is throttle body injectors(TBI), Check the plugs for power with the key on. No power, check fuse and wiring. If you have power, use a test light at the injector plug on both pins, crank the engine, the light should flash. No flashing, check the wire from the plug the the engine control module(ECM) If it is good(less than 5 ohms and not shorted) replace the ECM. TBI Has only one driver in the ECM, fires both injectors. Multi port injectors(MPI) has several drivers in the ECM. Unlikely they all died at the same time. Unless you have recently done some welding on the truck. Being it is a 90. I would pull all the fuses and visually inspect them. This also get rid of any corrosion problems. Fixed many problems by pulling a good fuse.

May 21, 2016 | Cars & Trucks

1 Answer

Getting good fuel pressure to carb but no fuel to injecters can a bad relay cause it to do that


No, but wrong thinking can get you a lot of scathing responses from crabby old mechanics. lol, like me! If you're getting good fuel pressure to, to the "throttle body injection" unit, (it only looks like a carburetor on the outside-it has about 120 fewer pieces inside it. And any form of fuel injection threw carbs into the fossil pile they deserved.)...so you are getting fuel to the injectors if you have fuel pressure in the line.
Have you watched for fuel spray out the bottom of injectors while the car was being cranked over? If so, and you have no fuel coming out, then you need to check the injector circuit. It is a fused circuit, so check first for the injector fuse. There should be an underhood fuse and relay block, so check there. Power for the injectors should be available at the injectors anytime the key is on.
Post back if you need more help. I was only kidding in my first response, cheers.

Jan 05, 2013 | 1992 Isuzu Rodeo

1 Answer

My 91 rodeo has tbi the injectors won't open I have replaced all fuses relays ECM injectors fuel pump still won't squirt gas


the fuel pump sending unit may be bad u may just have to replace the fuel pump itsself check all of youre connections and make sure they are good and clean dirt and grime is one of the worst things for a fuel pump and can also caused the pump not to function properly.

Sep 06, 2010 | 1991 Isuzu Rodeo

2 Answers

1993 rodeo not running no power to fuel pump


if there is no power to the fuel pump check relays and fuses....UNDERHOOD FUSE & RELAY PANEL IDENTIFICATION Fig. 2: Underhood Fuse & Relay Panel Identification Courtesy of ISUZU MOTOR CO. Fusible Link Identification ? A - 80 Amp (1991-92 3.1L) ? A - 60 Amp Main-1 ? B - 30 Amp Main-2 ? C - 30 Amp (1993-94) ECM (3.2L) ? D - 30 Amp Condenser Fan (A/T Models) Relay Identification ? 1 - Headlight Relay ? 2 - A/C - Heater Relay ? 3 - Starter Relay ? 4 - A/C Compressor Relay ? 5 - Charge Relay ? 6 - Fuel Pump Relay ? 7 - ECM Relay ? 8 - Wiper Relay Fuse & Circuit Breaker Identification ? 1 - 15 Amp (1991) ECM, Fuel Injection System ? 1 - 15 Amp (1992-94 2.6L) ECM, Fuel Injection System ? 1 - 10 Amp (1992-94 3.1 & 3.2L) Heated Oxygen Sensor, Fuel Injection System ? 2 - 20 Amp (1991-92) Fuel Pump ? 2 - 20 Amp (1993-94 2.6L) Fuel Pump ? 2 - 15 Amp (1993-94 3.2L) Fuel Pump ? 3 - 10 Amp (1991) ? 3 - 15 Amp (1992-94) Turn Signal Lights, Hazard Warning Flasher Lights ? 4 - 10 Amp Horn, Door Locks ? 5 - Not Used (1991 3.1L) ? 5 - 10 Amp Charging System, Charge Warning Light WARNING: Always disconnect battery ground cable before servicing "high- current fuses. It is recommended that "high-current" fuses be replaced by a qualified technician. Page 1 of 2 FUSES & CIRCUIT BREAKERS -1994 Isuzu Rodeo LS? 6 - Not Used (1991) (1992-93 2.6L) ? 6 - 10 Amp (1992-94 3.1L & 3.2L) A/T Interlock System ? 6 - 10 Amp (1994 2.6L) Heated Oxygen Sensor, Fuel Injection System ? 7 - 20 Amp Heater/Air Conditioning Blower Controls ? 8 - 10 Amp Air Conditioner Compressor Controls ? 9 - 10 Amp Right Headlight ? 10 - 10 Amp Left Headlight © 2008 Mitchell Repair Information Co., LLC.
62217_isuzfuse_1.jpg
Underhood fuse block swap out relay #7 thats the ECM relay.
Ground Circuits Using a DVOM, touch negative voltmeter lead to a good ground. Touch positive voltmeter lead to each ground terminal. With vehicle running, voltmeter should indicate less than one volt. If reading is greater than one volt, check for open, corrosion and loose connection on ground lead. See ECM GROUND LOCATION table for ECM ground location.
Page 1 of 1 SYSTEM/COMPONENT TESTS - 2.6L EFI -1994 Isuzu Rodeo

Mar 28, 2010 | 1993 Isuzu Rodeo

1 Answer

Not getting fuel to carberator i changed the pump filter and relay


Other things to check, do the dome lights work? If not change the fuse for those and try again. When its quiet around you turn the key all the way on but don't crank the engine. You should hear the pump kick on. But if the fuse is blown for the Dome lights and the Radio it also kills the ECM which kills the fuel pump since the ECM turns on the fuel pump. And the 91 does not use a carb, its a Throttle body injection system.

Aug 12, 2009 | 1991 Isuzu Rodeo

2 Answers

Adjusting fuel pump


If you have the 91 3.1 V6 Rodeo you can't adjust the fuel pump or fuel pressure. The only thing you can really do is to get a throttle body rebuild kit that will have a new diaphragm for the fuel pressure regulator. If you want to adjust it, you'll have to get an aftermarket regulator and install on the return line (the smaller line) and remove the spring out of the regulator on the throttle body. If you feel the fuel pressure is too low, then you might need to change the pump. Its located in the fuel tank, only takes 1 or 2 hours to do.

Jul 12, 2009 | 1991 Isuzu Rodeo

2 Answers

Injecters wont squirt gas 91 rodeo


there is a fuse in the fuse box on the drivers side inside the truck...its called the room fuse it controls the injectors look to see if its bad is so change it this will fix the problem

Aug 18, 2008 | 1991 Isuzu Rodeo

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