2001 altima with random misfire


Old 03-27-10, 08:58 AM
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Join Date: Nov 2008
Location: Texas
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2001 altima with random misfire

Ok, where should I start to fix this?

Any ideas?

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Old 03-27-10, 02:53 PM
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Originally Posted by cbuddy2005 View Post
Ok, where should I start to fix this?

Any ideas?

wires and plugs.start with the basics
Old 03-27-10, 04:08 PM
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Ya. Pull the plugs and read them. Check to make sure high tension wires are not rubbing metal on the engine, or touching each other, and you see signs of leakage at such points (a discoloration on the wires at such spots). Coil could be breaking down, something wrong in distribution. If there is grime on any of such components, coupled with moisture, that could bleed the spark to ground. Look under the hood with the engine running in the dark to see if you see stray voltage. Maybe 1 fuel injector is screwing up. Could be many things.

Have you driven through deep water, live by ocean mist or fog?
Old 03-27-10, 06:47 PM
Join Date: Oct 2008
Posts: 1,312
There is a web site just for this problem!
Random-Misfire Page

Also the camshaft position sensor can be the problem (if you have that) and I don't think they mention that on the above page. To test that you would need an oscilloscope.

And for complete detailed testing instructions for engine sensors, get a factory service manual set of books which you can order from your dealer. Engine electronic stuff is usually in the book on fuel and emissions.

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