Problem on my
1999 Chevy Monte carlo 3400 V6 SES light problem.
Millage = 145,000
finally got a OBD 11 tester and i have a P0300 and P0302, or a misfire in #2
cylinder.
Rechecked plug and wire, replaced wire, replaced coil for that
cylinder. Sounds a bit better but still idles like a misfire, tester shows a
misfire that is the only bad cylinder whats next, resistance on the
injector, or would that have shown up on the tester?
BL:
Thank you for the tip / donation.
Assuming there is no engine mechanical problem with that cylinder- like a rocker arm stud
has pulled out of the cylinder head, most probable cause is the injector. Scanners dont
detect specific problem (injector bad) just the type of fault. Our injectors today dont
usually fail because of low resistance anymore. They almost always fail because they are
plugged.
Here is a little trick, with the engine at idle, and missing, take a socket extension and tap
the injector. Very lightly at first a few times, then a LITTLE harder if it has not cleared up.
Be careful not to tap too hard and crack / punch hole in the injector. This procedure will
almost always free-up a stuck injector.
If it does, it may quit again in a day or two, or may last a month- hard to say.
If the injector does free-up, would suggest an injector cleaning service and fuel filter after
replacing the bad injector.
1999 Chevy Monte carlo 3400 V6 SES light problem.
Millage = 145,000
finally got a OBD 11 tester and i have a P0300 and P0302, or a misfire in #2
cylinder.
Rechecked plug and wire, replaced wire, replaced coil for that
cylinder. Sounds a bit better but still idles like a misfire, tester shows a
misfire that is the only bad cylinder whats next, resistance on the
injector, or would that have shown up on the tester?
BL:
Thank you for the tip / donation.
Assuming there is no engine mechanical problem with that cylinder- like a rocker arm stud
has pulled out of the cylinder head, most probable cause is the injector. Scanners dont
detect specific problem (injector bad) just the type of fault. Our injectors today dont
usually fail because of low resistance anymore. They almost always fail because they are
plugged.
Here is a little trick, with the engine at idle, and missing, take a socket extension and tap
the injector. Very lightly at first a few times, then a LITTLE harder if it has not cleared up.
Be careful not to tap too hard and crack / punch hole in the injector. This procedure will
almost always free-up a stuck injector.
If it does, it may quit again in a day or two, or may last a month- hard to say.
If the injector does free-up, would suggest an injector cleaning service and fuel filter after
replacing the bad injector.
Chevy Monte Carlo Misfire Code p0300,
P0301, P0302, P0303, P0304, P0305, P0306
P0301, P0302, P0303, P0304, P0305, P0306
3.1 and 3.4 V6 Engines
Comments
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| If after changing all that, and basically guessing, the truck is not fixed. That is why we always stress doing proper diagnosis. If that were done, you would have saved a lot of time and money. The problem depends on what cylinders were misfiring. If they were all the Odd numbers, then this may be a common problem of the left catalytic converter being plugged. If it only happens when cold, that could be an intake manifold gasket leaking vacuum. You could also have a contaminated gas. A sample would need to be taken. |
