Question about Isuzu Rodeo

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Hi Gurus, My 4JX1 engine is vibrating (rough engine sound as if not much fuel is injected) on idle and loss of power while I am driving after I injected oil grade 40W. After I notice that the oil grade was wrong and I drained it I overfill the right oil grade 5W-30W and this also caused my EGR Value to clog causing a burping sound when I shut the engine. I have cleaned the EGR Value and this burping sound is gone but the vibrating and loss of power is still present. What can I do to fix this rough engine and get back its power during idle and driving? Please help.

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I would suggest doing a full tune up and engine flush, if this does not correct the problem then there is something else wrong and needs to be checked on a code machine

Posted on Nov 09, 2010

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  • Isuzu Master
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Change plug wires and inspect distributer and coil--tuneups vary amoung year and model--40 wt oil is ok specially for older vehicles-its thickness is good for leaks and worn parts

Posted on Nov 09, 2010

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Rough idle in drive, correct rpm


Car idle is rough Inspection Service & Cost A rough idling engine can be caused by a number of issues, some of them are serious while others tend to be minor, but the symptoms remain pretty much the same. The car will feel rough and bouncy when the engine is running. The car will also idle below its regular speed, display inconsistent RPMs and may produce a shaking, skipping or slipping sound when the vehicle is running.
While a rough idling engine may seem to be a simple inconvenience it often indicates a deeper problem within the engine. The vehicle should be inspected and repaired as soon as possible because small problems have a way of turning into expensive repairs. How this system works: The idle speed of an engine is basically the rotational speed the engine runs on when it is un-coupled from the drivetrain and the throttle pedal is not being depressed. The idle speed is measured in the revolutions per minute of the crankshaft.
When an engine is running at idle speed it generates enough power to smoothly operate equipment such as the water pump, alternator, and power steering but not enough power to move the vehicle itself. A passenger car will usually idle between 600 RPMs and 1000 RPMs. A properly functioning idle should run smoothly without skipping or slipping. Common reasons for this to happen:
  • Dirty Fuel Injectors: The fuel injection system injects fuel into the cylinders, which creates a mix of air, and fuel to ignite and burn. Fuel injectors have tiny nozzles to spray the fuel into the cylinder and they can become clogged over time. clogged or failing fuel injector creates a lack of fuel in the vehicle's engine. This can cause a rough idle, it can also cause symptoms such as slow acceleration or the car not feeling as if it has enough power. If the problem is addressed early, it is possible to clean the injectors, which will restore them to full function. If this condition is not addressed in a timely manner the injectors will need to be replaced. Incorrect Idle Speed: While the average idle speed falls between 600 to 1,000 RPMs, if your vehicle is experiencing a rough idle it could be due to an incorrect idle speed setting. A trained mechanic can easily adjust the idle speed, and it should stay at the proper speed. If an adjusted idle speed becomes inconsistent or changes at random intervals there may be a bigger problem that needs to be explored. Vacuum Leak: If the vacuum system has a leak, it can seriously affect the ability of the vehicle's computer to regulate the air to fuel ratio. This can lead to a rough idle and if the problem is not addressed the car may experience slow acceleration and a lack of power. Vacuum leaks should be inspected and repaired immediately. Incorrectly Installed or Damaged Plugs: Spark plugs are responsible for creating the spark that allows the vehicle to burn fuel. If spark plugs are improperly installed or malfunctioning, the idle speed can be affected. The vehicle's engine may vibrate or there may be slipping or straining sounds coming from the engine. Defective or Clogged Fuel Pump: A rough idle can be related to fuel delivery issues. The fuel pump, which is responsible for pulling fuel from the gas tank to the fuel injectors, can become clogged or defective. If this happens the engine will not get enough fuel, which can cause a rough idle, sputtering, stalling and even slow acceleration. Clogged Fuel Filter: A clogged fuel filter can cause similar problems. The job of the fuel filter is to screen out contaminants in the fuel, over time it will become clogged and need to be replaced. A rough idle is one symptom of a clogged fuel filter. Failing Electrical Components: A problem or failure in the ignition system or various electronic components can cause a rough idle. If this is the case, the problem will usually get worse as RPMs increase. Common culprits include the ignition control module, plug wires, coils, and spark plugs. Defective Airflow Sensor: A defective airflow sensor can be responsible for a rough idle. A mass airflow sensor detects the amount of air coming into the fuel injection system and sends that information to the vehicle's computer. The computer uses that data to deliver the proper amount of fuel to the air in the vehicle. Over time these sensors can malfunction or become dirty. One of the first symptoms of a malfunctioning airflow sensor is a rough idle. The car may also accelerate slowly and even stutter or stall as the problem progresses. Dirty Oxygen Sensor: Oxygen sensors measure how rich or lean the gases are as they exit the combustion chamber. Depending on the results, the amount of fuel entering the engine is adjusted by the vehicle computer. The ultimate goal is to maintain an ideal mixture that produces the lowest emissions. A dirty or failing oxygen sensor will usually trigger the check engine light and can lead to a rough idle, lower fuel efficiency and failed emission test.

Sep 28, 2016 | AC Cars & Trucks

1 Answer

We live in New Zealand and own a 1998 Isuzu Bighorn, 3.0D. About 3 months ago it started idling roughly and stalling just after starting. Then it stalled on me when I was driving 70kph. It also has no


wow first post ever posting country ,what a brave person. !!!!
welcome to USA forums ,that have no such car.(truck)
the line up. (wiki list) so its 3.0L 4JX1
stalls and lost power.
The 4JX1 is a 3.0L direct injection diesel engine, turbo, some intercooled, which replaced the 4JG2 in the Isuzu Bighorn/Trooper/Holden Jackaroo. It uses unit injectors and 4 valves per cylinder.

can be caused by many reasons. get it scanned yet. ?
or see FSM book on flash codes from the direct injection fuel
controller? (per this engine option and market)

does turbo have proper boost? (PSI boost or +1 bar boost?)
does it even have a boost gauge.?
there are over 50 causes, of stalls (most inside engine)
but its not getting boost or the injection rates are wrong.
there are basic tests for each covered in the FSM
Factory (oem) service manual, with coverage for this engine.


3.2 L 6VD1 SOHC V6
3.2 L 6VD1 DOHC V6
3.5 L 6VE1 DOHC V6
3.0 L 4JX1 TD I4
3.1 L 4JG2 TD I4

Feb 15, 2015 | Isuzu Cars & Trucks

2 Answers

Troubleshooting a rough idle


Have the engine computer scanned for trouble codes. Misfires are from loss of fuel, spark, or compression. Check the fuel pressure, check that all spark plugs are getting spark, and if all good so far, test engine compression. Low compression in a cylinder will cause misfires and loss of power.

It could also be a vacuum leak- a loose or cracked vacuum hose or an intake gasket leak.

Jul 27, 2014 | Dodge Stratus Cars & Trucks

1 Answer

Rough idle and loss of power and gas mileage


Sounds like the engine has a cam chain issue.

Jan 17, 2014 | 1999 Dodge Intrepid

1 Answer

1990 toyota four runner running rough no loss of power no check engine light


spark plugs injector cleaner have u been runing with low fuel pump may be on it way try fuel injector cleaner & fill tank 90 plus octane

Dec 22, 2013 | Cars & Trucks

1 Answer

02 chevy trailblazer Vibration


oh,, we'll need some more information to be able to help, The thing is you didnt specify what vibrates for example when you start and you have vibrations while idiling, while in drive and the engine kicks back rough when changing gears more than likely its and engine mount thats bad. if its vibrating while idling its the fuel rpm ration (idling screw that needs adjusted or the MAP or air sensor if its fuel injected).. If its vibrating while the ac is turned on, check the ac step-up solenoid (the switch that increases the idling speed to match the ac's needed power.) we'll love to help or point you in the right direction but we'll need some more information. Describe whats happening for us , because we cant be there in person to actually experience it our selves. If you have a vid of the engine while vibrating etc all of that will be beneficial.

Dec 27, 2012 | Cars & Trucks

2 Answers

Our engine is running rough we have a 1999 Isuzu wizard 4jx1 - we think we have an injector problem - how can I check this fault - I need to establish if it needs a replacement injector or is it an...


Buy a can of throttle body cleaner take off the air filter box, follow the tube and then spray the throttle body and wipe it out first before condemning the injectors

Dec 01, 2010 | 1999 Isuzu Trooper

1 Answer

Hi Gurus, My 4JX1 engine is vibrating on idle. Idle speed is about 750rpm. At hgher speed the engine runs smooth. The problem is the engine dies off in the middle of driving. Sometimes it will start again...


Are you running the recommended oil grade? As the injection system is operated by engine oil pressure using the wrong oil grade can prevent your car from starting, running smooth or hard starting! Ideally they require a 5W30 oil grade. Idle speed is controlled by the engine control unit! It's a common rail diesel engine so there's nothing to adjust! The Camshaft position sensor could also possibly be intermittently faulting causing similar symptoms! It's located on the front of the cambelt cover(gray coloured sensor)

Oct 08, 2010 | Isuzu Trooper Cars & Trucks

1 Answer

Was driving down son's dirt road driveway returning home at low speed in 2nd gear in my 1997 sunfire when it suddenly started running rough with no power. it will start right up and idle is rough but...


Sure sounds like a typical case of dirty/contaminated fuel....or a broken vacumn supply hose around the intake manifold area, in neutral let it idl;e and look and listen for a hissing sound, or a broken black rubber hose.
Also have the computer scanned for any possible codes.
Another thing to look at is the catalyctic converter, put a vac. gauge on the engine and see if the vac drops to almost zero...indicating a plugged cat.

Aug 07, 2010 | 1997 Pontiac Sunfire

2 Answers

Ford F150 engine backfiring, running/idling rough


I Have a 1999 ford f150 4.6 that back fires and is just running really ruff when idling alot of nack fire a sord of like a pulse going on what is my problem?

Apr 16, 2010 | Ford F-150 Cars & Trucks

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