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Isuzu engine repair questions and answers

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  • AutoMD Member
    AutoMD Member - 1990 Isuzu Pickup - Engine - 4/18/2014
    Ecm fuse when key is turned to on.
    ecm fuse blows when key is turned to on.
     
    • HouseCallAuto
      4/18/2014 HouseCallAuto
      It most likely means that you have a shorted ecm or a circuit wire that powers the ecm is touching a ground. If you unplug the ecm and the fuse does not blow when you turn the key on then you can be resonably sure that the ecm is junk. If you unplug the ecm and fuse still blows then the circuit wiring is at fault or the ecm relay.
      HouseCallAuto
      4/18/2014 AutoMD Member
      ok, thanks. I already unplugged ecm & it did still blow.
      thanks Rick
    • HouseCallAuto
      4/18/2014 HouseCallAuto
      What number is this fuse? I don't mean amperage. Is it fuse #3 ?
      HouseCallAuto
      4/18/2014 AutoMD Member
      no, #1 in fuse box under hood
      HouseCallAuto
      4/18/2014 HouseCallAuto
      It most likely means that you have a shorted ecm or a circuit wire that powers the ecm is touching a ground. If you unplug the ecm and the fuse does not blow when you turn the key on then you can be resonably sure that the ecm is junk. If you unplug the ecm and fuse still blows then the circuit wiring is at fault or the ecm relay.
    • HouseCallAuto
      4/18/2014 HouseCallAuto
      Another strategy to narrow it dowm... Locate the Blue / White wire going into the ecm relay and cut the wire a few inches from the relay leaving room so you can reattach later. Now turn the key on and see if the fuse still blows and if it stopped then you have narrowed the area to between the ecm connector (white wire pin #3) and up to and including the ecm relay. If it still blows the fuse then the cause is closer to the fuse box on the white / blue wire.
  • AutoMD Member
     
    • Jimm
      3/18/2014 Jimm
      Have the specific fault codes scanned - for free - at any local auto parts store. Then post a reply with these codes (or fault code) for further assistance.
    • Pepe
      4/13/2014 Pepe
      Find out what the code is for the check engine light, the loud noise may be a leak in the exhaust system after the catalytic converter was replaced.
  • AutoMD Member
    AutoMD Member - 2002 Isuzu Rodeo - Engine - 4/13/2014
    Camshaft position sensor?
    Is there a way to test to see if a camshaft position sensor or Crankshaft position sensor is bad?
     
    • Pepe
      4/12/2014 Pepe
      The first symptom of a failing camshaft or crankshaft sensor goes as a warning from the car’s control module. As the camshaft sensor fails, the computer sends the driver a warning sign through the “check engine” light on the car’s dashboard, a scan tool could tell you whether it is defective or not.
      Pepe
      4/12/2014 AutoMD Member
      Was driving down freeway, car died, will not start. Have spark, fuel, replaced fuel pump, fuel pressure regulator. Car will star when starting fluid is sprayed into the intake, then dies. Any ideas?
    • Pepe
      4/13/2014 Pepe
      Can you hear the fuel pump kick on when you turn the ignition key to the on position? Plug in a scanner to check for codes.
  • Coop
    Coop - 1988 Isuzu Pickup - Engine - 4/12/2014
    Can a bad catalytic converter be replaced by just a straight pipe connection ?
    Cat has a couple holes .
     
    • alex
      4/12/2014 alex
      on something that old yes it can aslong as your not trying to pass emissions. newer vehicles have a second o2 sensor behind the cat and it will know it has been removed.
  • Coop
    Coop - 1988 Isuzu Pickup - Engine - 4/12/2014
    If the catalytic converter is replaced by a straight pipe,will there be any issues on performance ect.?
    Just wanted to know if there would be any issues by removing the Cat.Converter.
     
    • HouseCallAuto
      4/12/2014 HouseCallAuto
      Its not legal to do, or to say it another way, it is illegal to do that. OK, that being said, no there will be no performance issues but it will not pass a state car inspection.
  • AutoMD Member
    AutoMD Member - 1999 Isuzu Amigo - Engine - 4/9/2014
    How to reinstall my timing belt for my Isuzu.
    i forgot to mark the timing belt before took it out. i need to understand how i can put it back to the engine.
     
    • HouseCallAuto
      4/9/2014 HouseCallAuto
      This cannot be conveyed here as there are steps and pictures that go along with each step that show pictures of alignment marks. AutoZone has repair info on their site for free.
  • AutoMD Member
    AutoMD Member - 2000 Isuzu Rodeo - Engine - 4/5/2014
    I replaced plugs fuel filter computer air filter and engine turns over but will not start
    Will not start
     
    • HouseCallAuto
      4/5/2014 HouseCallAuto
      Plug in a $20 code reader from amazon and read what fault codes are stored as a first step. A computer is last on the list for causing a no-start. Checking for codes cannot be skipped over or you cannot fix the car.
      HouseCallAuto
      4/5/2014 AutoMD Member
      Will do and thanks for the comeback
  • AutoMD Member
    AutoMD Member - 2002 Isuzu Rodeo - Engine - 3/30/2014
    Was driving down freeway, engine stalled, and now will not start at all.
    Has spark, has correct fuel pressure at fuel rail, but will start when starter fluid is sprayed into intake.
     
    • HouseCallAuto
      3/27/2014 HouseCallAuto
      Plug in a code reader and see if any fault codes are stored. like maybe a code for a bad cam sensor which might have caused the fuel injector pulse to be lost. Get a noid light and plug it into any of the 6 injector connectors and crank over the engine and see if there is pulse or not. No pulse could give you what you have which is spark and it runs on alternate fuel.
      HouseCallAuto
      3/30/2014 AutoMD Member
      Have signal at injectors and have fire at coils, but still will not start.
    • HouseCallAuto
      3/30/2014 HouseCallAuto
      Plug in a code reader and see what fault codes are there . Checking for codes cannot be skipped. You can obtain a code reader for about $20 from amazon.com
  • AutoMD Member
    AutoMD Member - 1998 Isuzu Rodeo - Engine - 3/23/2014
    How tight should the timing pulley fit on the crank shaft? Mine seems to slip on too easily.
    Does anyone have Isuzu dimensions so I can mic the pulley Id and the crank shaft to assure the correct fit?
     
    • Jimm
      3/22/2014 Jimm
      The pulley should be a tight (almost interference) fit from the pulley inside diameter to the crankshaft outside diameter. Not sure of the specific size - internet search did not turn up anything.
    • John's Auto Repair
      3/23/2014 John's Auto Repair
      Are you having a problem with the pulley bolt coming loose?
  • AutoMD Member
    AutoMD Member - 2002 Isuzu Axiom - Engine - 3/11/2014
    What would cause my speed meter to jump around crazy and my car to lose and gain power
    its a 2002 izuzu axiom
     
    • Jimm
      3/11/2014 Jimm
      First step - have the stored fault codes or check engine light scanned - for free - at any local auto parts store; Advance Auto, Auto Zone, NAPA. Then, post a reply as 'add answer' with the specific code for more assistance. There may be a fault code stored in the OBD memory which may not be displayed as a check engine light.

      Possible Causes of Engine Hesitation or Stumble:

      Dirty fuel injectors (cleaning the injectors often fixes this)
      Dirty air filter (change filter)
      Dirty / clogged fuel filter (change filter)
      Bad MAP (manifold absolute pressure) sensor
      Bad TPS (throttle position) sensor
      Bad or dirty MAF (mass airflow) sensor
      Low fuel pressure (leaky fuel pressure regulator or weak fuel pump)
      Vacuum leaks (intake manifold, vacuum hoses, throttle body, EGR valve)
      Bad gasoline (fuel contaminated with water or too much alcohol)

      Sometimes, what feels like a hesitation is actually ignition misfire rather than lean misfire. The causes of ignition misfire may include:

      Dirty or worn spark plugs
      Bad plug wires
      Weak ignition coil
      Wet plug wires
  • AutoMD Member
    AutoMD Member - 2001 Isuzu Rodeo - Engine - 2/24/2014
    2001 isuzu rodeo v6. how do you loosen the belt tensioner how to loosen not or allen wrench??
    found tensioner but dont know what to loosen
     
    • HouseCallAuto
      2/24/2014 HouseCallAuto
      What is it that you are trying to do, replace the belt or replace the tensioner. You have not made that clear.
  • AutoMD Member
    AutoMD Member - 1994 Isuzu Rodeo - Engine - 2/24/2014
    They car won't charge past 9 volts unless I am going 50 mph, dash light stay on when not charging, fan won't work, then
    233.000, occurs all the time even at lower speeds on and off, dash lights are battery and brake that stay on when not charging. started about a month ago, I drive 100 miles a day. No check engine light is on. Cold or warm first thing last thing. Can drive for 4 hrs ...
     
    • HouseCallAuto
      2/24/2014 HouseCallAuto
      So either you have an oil soaked alternator drive belt causing an extreme amount of belt slipping (I doubt this) or you have a bad alternator.
  • AutoMD Member
    AutoMD Member - 1994 Isuzu Trooper - Engine - 2/11/2014
    Could it be the engine computer?
    changed 1 coil and plate under coil. No power to new pack also no codes are being thrown?
     
    • HouseCallAuto
      2/11/2014 HouseCallAuto
      Insufficient detail here. I do not want to assume. You replaced one of the three coils? You also replaced plate which is the ignition control module? No power to new "pack"? You mentioned a new coil and a plate. Now what do you refer to as the "pack" and when you say "power" what do you mean? Spark? or battery voltage? I doubt the computer.
  • AutoMD Member
    AutoMD Member - 1995 Isuzu Rodeo - Engine - 2/8/2014
    When ever I turn on the Highlights, Lights, or any other powered device the drain is huge.
    After a few seconds it goes back to normal what could it be?
     
    • Shane350zzz
      2/8/2014 Shane350zzz
      Its either your alternator or battery. Take it down to a auto parts store and theyll test both for free. Only takes a few minutes to test.
      Shane350zzz
      2/9/2014 AutoMD Member
      Replaced both about 2 months ago...
  • AutoMD Member
    AutoMD Member - 1995 Isuzu Rodeo - Engine - 2/8/2014
    When ever I turn on the Highlights, Lights, or any other powered device the drain is huge.
    After a few seconds it goes back to normal what could it be?
     
    • HouseCallAuto
      2/8/2014 HouseCallAuto
      This could be the beginning of a bad alternator. Voltage readings have to be looked at when this problem is happening using a digital voltmeter. Make sure the battery is not old and overdue to be replaced.
 
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