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Old 06-13-2019, 11:52 PM
Mauimobilemarine Mauimobilemarine is offline
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2002 Xterra
 
Join Date: Jun 2019
Posts: 1
Default Random misfire gone wild 3.3 xterra

Hi. Looking for some insight on my 3.3L 2002 Xterra. I've had a random misfire that started small and now has me completely crippled.
Here's what I've done over the course of months:
-checked distributor cap
-knock sensor
-spark plugs (went to iridium)
-plug wires
*All the above temporarily made the situation better
-new timing belt (was and still is properly timed)
-checked for vaccum leaks

-at this point my catalytics clogged and I drilled out the old material per the advice of my much more car savy coworker.
Then things went from still not great to totally fubar

-the slight misfire quickly deteriorated into major loss in power, engine searching hard at idle, and an almost inability to move the thing

-mycoworker suggested a fuel problem, so I did the Filter, pump and injectors. Still no luck improving the problem

Only code being thrown is still 0300 random misfire.

I've continued to check for vacuum leaks through my whole process

Noticed a crack on the passenger exhaust manifold which probably happened around the time I did the cats. But I didnt think this could be the issue.

Getting fed up.
-distributor rotor with no cam sensor code?
-did I mess up by removing my catalytic mesh?

Any ideas?
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