Question about 2004 Isuzu Rodeo

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Isuzu 2004 rodeo 3.5: Engine light, misfiring, loss of power. Had diag "VO valve OI" Had replaced, also timing belt, some better, still reported "multiple misfiring" Told need to change injector #4 and should replace all injectors on that side. Replaced only inj #4. Some improvement, engine light still on, still code for "multiple misfiring". ? Is driving with light on going to damage the engine? Is there a solution short of replacing all the injectors? Is that the right solution (as told by Isuzu/Hyundai dealer).

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  • johny707 May 25, 2011

    The plugs were replaced early on with factory spec'd. This has continued on for several months and thru many tanks of fresh gas, any water should have been purged by now. Any other ideas?
    The engine light continues to turn on even after being reset. Is there any danger to driving like this in the long run? Might I damage the engine?

  • johny707 May 26, 2011

    Problem with the Isuzu Rodeo 2004 Rodeo 3.5:
    Engine light, , loss of power, reports code for misfiring.

    Replaced spark plugs (yes with the special spec'd) No improvement. Replaced Coil #4. Still no improvement.

    Dealer diagnosis and replaced OI valve and Timing Belt. Slightly better. Then replaced Injector #4. Some better but still have Engine Light for reported code "multiple misfiring".

    Told need to replace all injectors on that side. (Replaced only inj #4) Is much better but still has very slight irregular misfiring and still have engine light with code for multiple misfiring. Engine light comes back on after manual reset.

    ? Is driving in this condition likely to damage the engine? Is there a solution short of replacing all the injectors on that side?



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Multiple Misfiring basically this means that the the car's computer has detected that not all of the engine's cylinders are firing properly. This is P0300 diagnostic code and indicates a random or multiple misfire; when you using one scanner reader, if the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring. A P0302 code, for example, would tell you cylinder number two is misfiring. Unfortunately, a P0300 doesn't tell you specifically which cylinder(s) is/are mis-firing, nor why.

Symptoms may include:
* the engine may be harder to start
* the engine may stumble / stumble, and/or hesitate
* other symptoms may also be present

Causes: A code P0300 may mean that one or more of the following has happened:
* Faulty spark plugs or wires
* Faulty coil (pack)
* Faulty oxygen sensor(s)
* Faulty fuel injector(s)
* Burned exhaust valve
* Faulty catalytic converter(s)
* Stuck/blocked EGR valve / passages
* Faulty camshaft position sensor
* Defective computer

Possible Solutions:
* If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.
* If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.

Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open.

Check it and keep us updated.

Posted on May 26, 2011

  • Debbie Sep 25, 2012

    I have had n


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This sounds like aftermarket spark plugs. Get yourself some NGK or Nippon Denso spark plugs and install them. Multiple misfires have to have something in common according to the computer and knock sensor. The only othe ritem that may cause this is contamintaed fuel. Has anybody taken a fuel sample. I'll bet that they will find water. Do not replace any thing else until a fuel sample can be taken. I find the use of a glass tube from a cigar or an old jar is the best to see. When you confirm contamination, replace the plugs and then drain the tank and replace with fresh fuel.

Posted on May 18, 2011

  • Kori Policy
    Kori Policy May 25, 2011

    Used injector? If you have had some improvement this is a good indicator of being on the right path.



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P0300 and P0303 misfire codes 2004 Isuzu Rodeo 3.5L

so missfire detected and cylinder 3 missfire detected.
check to see injector pulse with "noide light" if ok injector is problem
remove fuel rail and injectors look into top of injector for blockage in screen filter in injector if blocked clean out or injector carby places can remove this screen replace it and test injectors and clean or just buy new injectors. make sure to clean out fuel rail and change fuel filter also.
if noide light flashes irratic or not at all wiring issue, check for power on one wire with ignition on 12v other is earthed by ecu when opened to inject fuel. other thing that can cause problem on cylinder is tappet clearance "shims" too tight, could do compression test to see if compression is low on cylinder or a cylinder leakage test to see if valves are leaking. broken valve spring. valves do not hit piston on these engines even if cam belt breaks, they are a "free wheeling" engine

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92 isuzu running rich on fuel

IAC - idle air control valve . What are the fuel trims at ? Are they with in + or - 10% short term an long fuel trims ? Do you know what fuel trims are ? What's the IAC counts at looking at scan tool data ? Or are you just guessing to find a fix ?
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Okay I have a 2000 isuzu rodeo v6 4wd and I have been having problems with it since i've had it.I started having slight engine bog and then the car wouldn't even run i replaced the intake manifold gasket...

IT'S CALLED MISFIRE, that get a tuneup yet>?
lacking cash for shop
or cash for tools
how can one fix a misfiring engine,?
no scan tool either.
be impossible.
now DTC errors code stated by you.
there are 50 causes of misfire, at least, i have a list but nah.....
new spark plugs.
see those 3 coil packs, put on new HV wires there
new air filter and fuel filter,? a tuneup, do that first.
is compression at spec. 150 psi or 80? if at 80 the cam belt slipped
that belt is a 60,000 service item are you skipping belt changes.

EGR DTC errors
which one. each has a different cause. guessing will fail.
fuel pressure
but no PSI stated
or at key on, idle and at WOT for 1 second. (gunned)
pump pressure is 3 tests NOT one, infact its 6 tests, buy the book.
or more if you do an injector leak down test.

one question really
can you force engine to have full power WOT>
wide open throttle up a hill,? (right foot aggressive)???
pretend helper cant drive car
tell all things the engine does good./bad/ugly
all things tells use whats up.
hot engine cold, parked and driving flat ground and hills.
all things,
or its going to be expensive guessing.

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1 Answer

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The upper intake gaskets may be leaking. They are made of plastic and metal and will leak air. Do not remove the cover on very top of manifold when changing.

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2 Answers

Loss off engine power very sluggish

sound like timing might be out, loss of power indicates jumped or slipped timing

Dec 09, 2008 | 2004 Isuzu Rodeo

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