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Edward, Service Technician
Category: Car
Satisfied Customers: 2742
Experience:  20 + years experience on various makes and models.
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isuzu trooper: just asked and gave card info for a answer to

Customer Question

just asked and gave card info for a answer to 91 isuzu trooper v6 5 speed, slows down on hills bad, has high miles, engine light comes on some times then goes off, now it sputters when I give it too much gas pedal even on flats, hard to get up to 3,00 rpms and speed, didnt get answer , but put in 39 dollar offer and card data, got really bad, hard to get speed up sputters in every gear when gas pedal is pushed, light comes on for while then goes off, check engine

Submitted: 3 years ago.
Category: Car
Expert:  Edward replied 3 years ago.

Eclayton4 :

Hello and thanks for your question. My name is Eddie and I will do all I can to help.

Eclayton4 :

Let me first ask, have you pulled the vacuum line off the fuel pressure regulator and checked to see if there was any raw fuel in the vacuum line. ?

JACUSTOMER-2u02wfqu- :

no where is it located, and if there is raw fuel in it does it have to be replaced Can that cause the check engine light to go on and off at different times? Can the pressure regulator cause the hill power loss and in ability to get upto speed smoothly with normal pedal pressure? Friend gave me computer hook up meter, would that show anything?

JACUSTOMER-2u02wfqu- :

In past few months light would come on without affecting any performance and go off every now and then, now check engine light is on alot.

Eclayton4 :

Fuel pressure regulator is tough to get to on that model, it's passenger side, buried in the fuel rail.

Eclayton4 :

This is OBD I system, so if it's an OBD II scanner (for vehicles 96 and up) it will not work with your truck.

Eclayton4 :

You have a single wire and you have to count the flashes of the check engine light.

Eclayton4 :

On Trooper models to 1991, the single wire diagnostic connectors are located under the center console.

Eclayton4 :

Here is all the codes that it COULD be. Since the check engine light is coming on, I suspect you have at least 1 or more of these codes stored.

Eclayton4 :
12 No tach signal to ECM - No Distributor Reference Pulses{4}
13 Oxygen sensor or circuit


Coolant Temperature Sensor Circuit

High Coolant Temperature{5}


High Coolant Temperature{6}


Low Coolant Temperature{6}


Coolant Temperature Sensor Circuit

Low Coolant Temperature{5}{7}

16 Same as 15


TP Sensor And/Or Idle Switch

MAP Sensor{1}

TP Sensor, Voltage High{5}{7}

Throttle valve switch/Wide Open Throttle (WOT) position sensor, 1989 Manifold Absolute Pressure (MAP) circuit failure
Throttle Position Sensor (TPS) - V6 models


TP Sensor, Voltage High{6}


TP Sensor, Voltage Low{6}

22 Starter signal system/1988 and 1989 fuel cut solenoid circuit failure

TP Sensor

TP Sensor, Voltage Low{5}{7}

No Starter Signal{8}

Fuel Cut Off Relay{4}


MAT Sensor

MAT Sensor, Low Temp{7}

M/C Solenoid Circuit{4}

Mixture control solenoid circuit failure - 1987 and 1995 Amigo/Pick-up, 1989 to 1994 V6 models

Power transistor circuit - 1988 to 1994 four-cylinder models

Intake Air Temperature sensor voltage high - turbo, 1989 to 1995 1.6L, 1.8L, 3.2L vehicles


MAT Sensor, Low Temp{6}


MAT Sensor, High Temp{6}

24 Vehicle Speed Sensor (VSS) circuit - V6 models
Pressure regulator vacuum switching valve - 1988 to 1994 four-cylinder, also Impulse non-turbo


MAT Sensor

Vacuum Switching Valve{4}{9}

MAT Sensor, High Temp{7}

Intake Air Temperature sensor voltage high - turbo, 1989 to 1995 1.6L, 1.8L, 3.2L vehicles
AIR VSV circuit failure


Canister Vacuum Switching Valve{4}

VSV System{9}


VSV System{9}

Constant Voltage High From VSV To ECM{4}

Fuel injector driver transistor


No Ignition Reference Pulses To ECM{4}

Wastegate Control{7}{8}

No ignition reference to ECM - 1988 and 1989 models
32 Exhaust Gas Recirculation (EGR) system failure


MAP Sensor

MAP Sensor, Voltage High{5}{7}

Fuel Injector{9}


MAP Sensor, Voltage High-Low{6}


MAP Sensor, Voltage Low-High{6}


MAP Sensor{8}{11}

MAP Sensor, Voltage Low{5}

EGR Gas Sensor Circuit{4}{7}

Fuel Injector{10}


MAP Sensor Constant Voltage High{4}

Power Transistor System{9}


MAP Sensor Circuit{4}


Crank Angle Sensor{9}

Cam Signal{7}


Fuel Cut Off Relay{4}

Electronic Spark Timing{5}

Ignition Control Circuit{6}{8}

43 Throttle valve switch/Wide Open Throttle (WOT) position sensor {9}
Electronic spark control failure - V6 models
Idle contact switch always closed (1988 to 1994 four-cylinder, also Impulse non-turbo)
1989 Manifold Absolute Pressure (MAP) circuit failure
Knock sensor (1989 to 1995 1.6L, 3.2L) {8}


O2S Lean

Fuel Metering{9}


Oxygen sensor (rich condition indicated)

Fuel Metering{9}



Fuel Cut Solenoid Circuit And/Or ECM{3} carbureted four-cylinder models



PROM, Cal-Park & ECM{5}

ROM and/or RAM{9}




ROM and/or RAM{9}

PROM, Cal-Park & ECM{5}


Switching Valve And/Or ECM{4}

Vacuum Switching Valve{9}


M/C (mixture control) Solenoid Circuit And/Or ECM{2}

Vacuum Control Solenoid And/Or ECM{3}

Power Transistor System{9}

Fuel Pump, Voltage Low{5}{8}

Shorted vacuum control solenoid, Faulty Electronic Control Module (ECM) - 1988 and 1989 models



PROM, Cal-Park & ECM{5}

Faulty Electronic Control Module (ECM) or oxygen sensor
61 Air flow sensor circuit failure {9}
62 Air flow sensor circuit failure {9}
63 Vehicle Speed Sensor (VSS) circuit {9}
64 Fuel injector driver transistor {9}


Throttle valve switch/Wide Open Throttle (WOT) position sensor, 1989 Manifold Absolute Pressure (MAP) circuit failure

Full throttle switch always on

66 Knock sensor circuit failure {9}
71 Throttle position switch signal abnormal {9}
72 VSV for EGR system short or open {9}
73 Same as 72 transister or ground {9}

{1}-1989 I-Mark.

{2}-I-Mark, carbureted.
{3}-Pickup, carbureted. {4}-Carbureted models.
{5}-Throttle body fuel injection. {6}-Rodeo & Trooper w/3.2L engine, Stylus & 1990-92 Impulse less turbocharger.
{7}-Stylus & 1990-92 Impulse w/turbocharger. {8}-I-Mark, multi-port fuel injection.
{9}-Amigo, Pickup, Rodeo & Trooper w/2.6L engine & 1988-91 Impulse. {10}-Impulse.
{11}-Amigo, Pickup, Rodeo & Trooper.

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