Dear BL:
99 monte carlo 3.1
milage = 145,000
finally got a OBD 11 tester and i have a PO302, 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:
Assuming there is no engine mechanical problem with that cylinder, 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 carefull 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.
Back
99 monte carlo 3.1
milage = 145,000
finally got a OBD 11 tester and i have a PO302, 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:
Assuming there is no engine mechanical problem with that cylinder, 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 carefull 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.
Back
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