misfire

[Nismojunky]

hey guys my pathfinder has a problem, it seems to be misfireing and not burning all the fuel, its got new plugs wires cap as of june timming as of june and O2 as of january, what could cause this i checked for vacume leaks and there are none, im out of ideas

[nunya]

What brand tune up parts?

[Nismojunky]

nkg plugs and bosch wires cant remember cap and o2 was boush

[adamzan]

Are you absolutely sure they put the timing belt on right? The shop put my dads on off by one tooth, after you set the spark timing it ran ok but still "not right". Like you're talking about.

Edited September 20, 2009 by adamzan

[94extreme]

^^ timing is off or 02 sensor is kaput.

[Nismojunky]

we will have to check the timming we couldnt check it today the timming light wasnt getting a good reading the rpms were jumping every where apparently so ill get the mecanic to look it over im going to do a computer read out in the next few days

[adamzan]

If the timing is way off the belt is probably off a tooth. Also is the CEL on ?

[Nismojunky]

no cel light going tonight to get the timming checked

[adamzan]

I'll buy you a beer when you come up here if the timing is off.

[Nismojunky]

timming was fine and o2 is going to be tested tomorrow, we did discover that the distributer was off by a 16th of a inch we turned that and it has helped still running a lil rich tho probally the o2

[adamzan]

So your tore it down and checked the timing belt and made sure it lined up right?