Misfires

Asked by Rdplumb1 Mar 25, 2017 at 10:13 PM about the 2003 Nissan Altima 2.5

Question type: Maintenance & Repair

Had a 3rd cylinder misfire. Changed the coil pack
on that cylinder. Ran great for two days. Started
back to idle rough & check it engine light flashing
when driving. Changed the spark plug on the 3rd
day. Runs good but, idles rough when you start &
stop. My next thought was fuel so, I bought some
Seafoam fuel conditioner & added it to 1/4 tank of
gas. My old lady has driven the car back forth to
work the last two days but only 5 miles round trip!
So my question is,  do you think if I drove the car
on the highway for 30 miles or so that should help
right?  And if not, what will?

4 Answers
223,955

Rowefast answered 7 years ago

Possible causes; Faulty spark plug 3, Clogged or faulty fuel injector, 3 Faulty ignition coil 3, Fuel injector 3 harness is open or shorted, Fuel injector 3 circuit poor electrical connection, Ignition coil 3 harness is open or shorted, Ignition coil 3 circuit poor electrical connection, Insufficient cylinder 3 compression, Incorrect fuel pressure, Intake air leak...The P0303 code means that the cylinder 3 is misfiring or is randomly misfiring. Start by checking for intake leaks an if no leaks are found the next step is to replace the spark plugs on cylinder 3. If the problem persist more tests needs to be done to diagnose problem.

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Yoder70 answered 4 years ago

Will a bad cam angle sensor or crank sensor cause #1 cylinder to misfire I have replaced the spark plug, coil and injector. Still not running on # 1 cylinder only. Sometime it will not start. Wait 30 seconds and it starts. Not sure what else is left. The cylinder seems to have plenty compression.

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GuruGR18H answered 4 years ago

Nissan Altima 2006 6 cylinder and cylinder#2 is miss firing what is best way to fix it

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