Question about Isuzu Rodeo

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I have a 1994 isuzu rodeo 3.2 litter manual transmition, 4x4. My problems started out with my spark plug tubes leaking oil,i dint want to fix the leak so i just cleaned out the oil every once and a while but, then i got some really bad gas with atleast one gallon of water in it and that put it out of commison for a while i got rid of bad gas.after that when ever i am at a low rpm it wants to start bucking, or surgeing now sure what you would call it. sometimes at low speeds it wants to die, im not sure if it is the fuel pump or not, so i replaced the parts i already knew that it needed. put new intake manifold gasket, valve cover gaskets, the little rubber deals at the top of the sparkplug, i did not replace the actual spark plug tubes though, replaced the spark plugs got new spark plug wires. it still does it. so i researched and thought it might be the EGR i cleaned it but it did not help much if at all.

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  • adrianna_mar Aug 02, 2010

    Thanks lots of help. Hopefully i can get this fixed or we will be talking again very soon.




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Well it can only be 2 areas that would be causing this problem:
1. The ignition system
2. The fuel system.

Ignition System:

You need to check the spark plugs and make sure they are not worn, and that the spark plug gaps are correct.
You should replace the spark plugs really, due to them having had water on them when you had the bad fuel. This would cause them to break down and not fire properly at low RPM.

Fuel system:

You need to put some fuel injector cleaner into the fuel tank, this will evaporate any water residue left in the system as well as clean the injectors of any water corrosion which would have been caused from the bad fuel you had in the system, this would cause the problem you are having also at low RPM.

I would also make sure that the spark plug tubes have new oil ring seals so that the oil does not get on the spark plugs again. Oil can and does seep into the spark plugs over time and will cause them to miss fire at low rpm.

Hope this has helped, let me know if you need more information.



Posted on Aug 02, 2010

  • adrianna_mar Aug 02, 2010

    I changed the spark plugs, got new spark plug wires the new ones the rubber seal is very big and barley fits, i have some thermal stuff that someone suggested to put in the tank, at first i thought i might not have got all of the water oujt of the tank but i changed the filter and then turned the key and pumped some gass out it all looked clear, i will try some injecter cleaner. one more Q i went to price a fuel pump at napa and they said there was three diffrent options, one with two pumps one with just one pump and another with one pump and a strainer.

  • Jason Maurirere
    Jason Maurirere Aug 02, 2010

    Well according to the information I have you only have the 1 pump in the tank.

    It may pay to clean out the intank fuel filter which is also in the tank, this will be attached to your fuel pump.

    Also replace the main fuel filter which is under the truck on the drivers side by the chassis rail near the rear of the truck.
    Water will cause the filter element to go soft and cause the fuel to slow down as it passes through it.



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