Question about 2003 Nissan Altima
O2 sensors should not cause a misfire. A scan tool can read the O2 sensors readiness when the car is running. Most often the MIL(engine light) will come on if it isn't working properly. Inspect the plugs, and check gaps. Just replace them all if it has been a while.
It may be the plug wires, which can be checked with an OHM meter, simply. You need the numbers from the repair manual to see if they are in range. If you have coils, they can be chaeck the same way. If you have a distributer, then check or replace the cap, even a small crack can cause problems.
A cheap spark checker can be used at the end of each plug wire to check for a strong spark.
That about cover it.
Posted on Jan 15, 2010
Try fuel injectors.
Posted on Jan 15, 2010
SOURCE: cylinder 3 misfire
Make sure you're using the recommended spark plugs. When my car did that, I had put Bosch Platinum Plus-4 plugs in and got that same problem. Turns out the plugs are too hot and cause it to fire prematurely and kick the misfire code.
Posted on Jul 24, 2008
What you should check first is the spark plug for the #1 cylinder and see if there is a white film on it this would be a sign of a coolant leak which would cause a problem with the O2 sensor
Posted on Oct 11, 2008
I have a ford 2003 windstar that was running very rough when cold and almost stalling. engine light came on. went to autozone and they read the codes for free and told me it was running lean on Bank 2 also. i came home searched for the O2 front sensors online using the info autozone gave me. there are 2 front sensors on my car that need to be replaced at the same time. look for ones that have a direct plug in and don't need wire splicing. the ones without the wiring harness are cheaper but more of a pain, i think.
they were fairly easy to replace. getting access with the wrench was the worst. reset the light by disconnecting the battery for a few minutes. seems fine now and the light hasn't come back on.
Posted on Jan 25, 2009
Tips for a great answer:
Knock Sensor Strategies: A failure with the knock sensor can cause spark knock and engine damaging detonation because the PCM will not know to ****** ignition timing if knock is occurring.
I suggest to replace spark plugs before you return back.
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