Problem with my 2001 Pontiac Grand Am
2.4 4 cylinder
Changed spark plugs
To repair this problem = changed spark plugs.
GM tech = JK
question = The car intermittently misses under normal driving conditions every
once in a while. Changing the spark plugs makes it go away but a day or so
later it comes back.
JK:
If changing the plugs helps, i would look closely at the plugs that were removed.
Make sure they all seem the same color. If one is oil fouled, or looks a little
greenish or orange (depending on which coolant is in the system at this time)
this would indicate an internal engine problem. If one is totally black, this would
indicate a rich fuel condition which may be caused by a faulty injector or is more
than one is black, then i would suspect a leaking fuel pressure regulator.
If plugs look OK, you may have a problem with the ignition coil housing cover or
one of the plug boots. The cover is the black plastic housing under the
aluminum cover you remove to replace the plugs. An ohm meter check will
sometimes indicate this housing is faulty. Also possible the ignition module itself
is stating to fail.
A sticking injector is also a possibility. An injector balance test may be needed.
You need to find out which cylinder is missing when the condition is occurring. A
scanner with live engine data stream is the best way to see this. That would at
least narrow down to 1 cylinder to concentrate on.
2.4 4 cylinder
Changed spark plugs
To repair this problem = changed spark plugs.
GM tech = JK
question = The car intermittently misses under normal driving conditions every
once in a while. Changing the spark plugs makes it go away but a day or so
later it comes back.
JK:
If changing the plugs helps, i would look closely at the plugs that were removed.
Make sure they all seem the same color. If one is oil fouled, or looks a little
greenish or orange (depending on which coolant is in the system at this time)
this would indicate an internal engine problem. If one is totally black, this would
indicate a rich fuel condition which may be caused by a faulty injector or is more
than one is black, then i would suspect a leaking fuel pressure regulator.
If plugs look OK, you may have a problem with the ignition coil housing cover or
one of the plug boots. The cover is the black plastic housing under the
aluminum cover you remove to replace the plugs. An ohm meter check will
sometimes indicate this housing is faulty. Also possible the ignition module itself
is stating to fail.
A sticking injector is also a possibility. An injector balance test may be needed.
You need to find out which cylinder is missing when the condition is occurring. A
scanner with live engine data stream is the best way to see this. That would at
least narrow down to 1 cylinder to concentrate on.
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