1998 nissan altima PO 300

Asked by Apr 07, 2010 at 09:43 AM about the 1998 Nissan Altima GXE

Question type: Maintenance & Repair

I have a 98 Nissan Altima that has intermittently give me a code PO300.  I have replaced the plugs, wires, distributor and cap.  Still has the same problem.  Don't know where to go from here.

3 Answers


well there could still be a number of things causing that. you could have a vacuum leak some where causeing the cylinders to lean out. listen for any sucking noise and if you cant hear anything try spray some starter fluid around intake seal and suck to see if the engines rpms increas at all.

1 of 1 people found this helpful.

I didn't think that it was a vacuum leak because it will run fine for awhile (long enough for the check engine light to cycle off) then start missing again.


I had a similar issue with a 94 altima. I narrowed it down to one cylinder by taking off plug wires until I found it, and changed the injector on that cylinder. It fixed it immediately, and a week later the next cylinder started. It was the injector also. It ran great for the next few months until I traded it in.

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