Anonymous asked in Cars & TransportationCar MakesDodge · 1 decade ago

1998 Dodge Ram 1500 V6 3.9L Misfire?

1998 Dodge Ram 1500 cargo van V6 3.9L 122K

Check engine light came up and codes shown are

P0300 random misfire detected

P0302 cylinder 2 misfire detected

P0304 cylinder 3 misfire detected

I already changed spark plugs, also ignition wires

and still the same codes show up again, what can

be the cause please help me....


i already clear the codes 2 times,

test drove the van, 15 miles and

then when i shut of and started again,

the check engine light showed up also i checked the codes and they were still the same

6 Answers

  • 1 decade ago
    Favorite Answer

    if its running good now the codes may be coming up because they wasn't erased the proper way,you have to use a scanner to erase those with or they will still show up even after a good tune up,if the truck is still miss firing check the cap on it, chances are it may have a small hair line crack in it,good luck.

    Source(s): been a certified mechanic for 38 yrs now.
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  • 1 decade ago

    Check that the spark plug wires weren't switched during the change.

    Also, the cap and rotor could be bad. Check for wear of the distributor shaft. The pickup could be rubbing the pickup coil at one point causing the problem.

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  • 1 decade ago

    my last dodge had that problem.what i would suggest is to check your timing,run a compression check on those two cylinders,and make sure those plugs arent fouled.they may be new but if it runs to rich or lean it will foul them valve seals and seats ended up being my problem.hope this helps.

    Source(s): mechanic
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  • Steve
    Lv 4
    1 decade ago

    check the lower intake valley pan for the gasket sucked in,just look down the throttle body with a flashlight and see if any oil is in there,usually sucked in on passenger side rear.

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  • Kelley
    Lv 4
    4 years ago

    You need to check the compression on these cyls. You might have a bit of carbon across the valve seat

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  • Anonymous
    1 decade ago

    If it's misfiring maybe u have a bullet stuck in the barrel ???

    Source(s): buy a holden
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