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SUVs Isuzu Trooper Isuzu Trooper Maintenance and Repair
313 messages, Last post on Nov 23, 2009 at 5:10 PM
You are in the Isuzu Trooper Forum. Your Hosts are steve_ & tidester
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I have a 99 trooper. I have noticed as of late that the idle will "take off" to around 2000 RPM. I have disconnected and reconnected the two sensors that are right up front by the throttle linkage and it worked, I think by coincidence. It could have been by shutting the truck off. Anyone have any ideas as to what might be happening.
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Replying to: mjtank (Jul 31, 2006 12:05 pm) |
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Replying to: tidester (Jul 31, 2006 8:24 pm) 
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Replying to: jukbxhro (Aug 05, 2006 9:15 pm) I had the same problem as you are having now, I removed the switch assy from the transmission (held on by 3 small bolts) and one electrical connection. I dismantled the switch and found that all the grease inside had dried up and the switch contacts were shorting on each other. I cleaned out the switch and relubricated it with dielectric grease . Make sure to install the switch exactly as you found it as the position of the switch is adjustable and Very important as it tells the computer what gear you have selected. Hope this helps.
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I`m a new be to this group. Checked out group and decided to join. have a 91 isuzu trooper 2.8 v-6 5spd,4x4.Had problem`s with fuel pump. Installed a new fuel pump and fuel line. Truck will turn over,but it won`t start,has fuel going to T.B.I.But if you put gas in T.B.I.it will fire up and run until gas in t.b.i. is burn`t up .Before i changed fuel pump,it acted like it was running out of gas,jerking,stalling.I have a half of tank of gas in vechicle.This is my first problem with a trooper with this kind of problem`s.Any suggestion`s or help would be greatly appreciated.Thank you
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Replying to: jonah75er (Aug 07, 2006 9:57 am) You can check the fuel pressure (carefully) to see if you are getting the correct pressure at TB. There is a pressure regulating valve that could also be at fault MEASURE FUEL PRESSURE Start engine and idle. Disconnect fuel pressure regulator vacuum hose and plug. Fuel pressure should be 294 kPa (42 psi) Reconnect hose at regulator. Fuel pressure should be 245 kPa (35 psi) Disconnect vacuum hose from regulator and plug it. Turn engine off and observe pressure reading. Fuel pressure should remain approximately 245 kPa (35 psi) for four (4) minutes. Looks like you should have 35 pounds of pressure at rest. Remember that without the engine running, the fuel pump may only be on for as little as 2 seconds when the key is turned on. There are previous posts that show how to energise the pump directly for test purposes if you do not already know how to do this. 1991 Isuzu Truck Trooper II L4-2559cc 2.6L SOHC (4ZE1) Vehicle Level Powertrain Management Fuel Delivery and Air Induction Description and Operation Fuel Injection System Fuel Injection System The multi-point electronic fuel injection system consists of the ECM, various engine condition and operation sensors and the fuel system. The main control sensor is the oxygen sensor. Utilizing these inputs, the ECM calculates fuel injection quantity and timing. Because injector valve opening is a constant and fuel pressure is regulated in relation to intake manifold pressure, the ECM controls injection quantity by varying the duration of injector "ON" time. Fuel Injector The injectors are "ON/OFF" solenoid valves installed one per cylinder on the intake manifold. The ECM sends pulses to energize (open) the injectors for varying lengths of time depending on its fuel requirement calculations, thereby controlling air/fuel ratio under a wide range of operating conditions. .Let us know what you find. Hope this helps.
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My sincerest apologies for posting the wrong engine info in the previous post. I should not offer advice so early in the morning. I reread your post and saw my error. Previous post was for the four cylinder. I have given links to the diagnosis charts for your engine (V6) below. I believe the fuel pressures are same, but there is no fuel tap to attach a guage to on the V6. There may be codes stored because the V6 employed a different ECM than the 4 cyl. The "Check Engine" light displays trouble codes that are stored in ECM memory. To activate the Diagnostic mode, a special connector located in the center console is utilized. When the ALDL (assembly line diagnostic link) connector is jumpered between terminals "A" and "B" with the ignition "ON" and the engine not running, the light will flash any stored codes. The first code to display should be code 12. This indicates that the self-diagnostics are functioning and is not a trouble code. The code 12 display is a flash followed by a short pause, then two flashes followed by a longer pause. If other codes are present, they will display in the same manner after code 12 has flashed three times. For example, the code 23 display is two flashes followed by a short pause, then three flashes followed by a longer pause. Each stored code is displayed three times, starting with the lowest in numerical order. Code 12 will repeat when all codes have shown. If no codes are stored, code 12 will display repeatedly until Diagnostic mode is exited by removal of the ALDL jumper wire. Remove the jumper wire before attempting to start the engine. To allow checking circuits which may be difficult to energize without driving the vehicle and being under particular operating conditions, all ECM controlled relays and solenoids (except fuel pump relay) are energized in Diagnostic mode. "Scan" tools also utilize the ALDL connector to access system diagnostic information. The use of a "Scan" tool is required to perform many of the tests under TROUBLE CODE COMPONENTS. here is link to ALDL pin locations. http://www.carspace.com/atfdmike/.59aa317f!v= I hope this helps. http://www.carspace.com/atfdmike/.59aa3141!v= http://www.carspace.com/atfdmike/.59aa313d!v= http://www.carspace.com/atfdmike/.59aa3151!v= http://www.carspace.com/atfdmike/.59aa3152!v= |
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Replying to: lost (Aug 06, 2006 4:15 pm) 
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