spark nock???

jeepeater2003

Member
Joined
Mar 21, 2005
Location
raleigh
hey all

mom bought an 01 nissan pathfinder. it has less than 60... miles on it.
when you get on the gas it has what sounds to be a spark nock. it doesn't sound good really. i told her to run the highest gas and she did for about 3 tanks. it still does it. anyone have any sugestions? ANYTHING

thanks
tyler
 
change the fuel filter, have the fuel pressure /volume checked, fuel pump could be on it's way out ( weak pressure, low volume will cause a lean condition).

have the injectors cleaned, might have a few that are partially clogged causing same condition.

May also have the cooling system checked, it may be running too hot, but not hot enough to set off a code. ( Factory gauges are not very accurate )

Technically, spark knock is a misfire, on the newer vehicles, it does set a code.

A few Wild Ass Guesses

K
 
I has a Diahatsu Rocky for over seven years and it did that all the time. If I ran high test it would stop. A couple of my friends have or own nissan pathfinders and I've never heard one spark knock with low test. Sounds like it's something other than a gas issue.
 
Wwildman said:
It May Have Carbon Build Up In The Cylinders
Click to expand...

How does this post help ?

How does his mom check for carbon build up on her cylinders ? Is there a CBU test kit ? a CBU tool, a CBU brush ? Should she poor CBU remover in the gas tank or a little soapy water in the intake ? How does one know their CBU levels ? Is there a CBU guage that could be installed ? Maybe a book 'Mom's and CBU' or 'CBU for dummies' Is there a CBU website that would explain this ? How does CBU incure knocking ?
Please explain what you know about CBU in relation to knocking that would be helpful here. I'm certainly no CBU expert and would like to learn more about CBU

J(feelin fiesty)B :rolleyes:
 
Try a can of BG 44k. It's a fuel system cleaner/fuel injector cleaner. put it a full tank like the can says. It's expensive for fuel injector cleaner ($30) but it works great. I had a clogged fuel injector on a 91 yota that it cleaned right up. I think most parts stores should sell it. If not try Fred Anderson Toyota. I know they used to sell it.
 
My wife and I used to have a 2000 Xterra (3.3L V6) that would spark knock at certain loads/throttle positions. I ran a bottle of fuel injector cleaner through it and it cleared it up - the Lucas brand that is called "Tune Up in a Bottle" or something like that. After about 10k miles, it was doing it again, so I ran another bottle of the Lucas stuff, and it fixed it again, and we never had another problem with it. Might want to try it - easy and cheap if it works. :)
 
she ran a different fuel brand and a the best grade and she said it helped so i will also get her some fuel cleaner. thanks

tyler
 
seafoam through a tank of gas and then through the brake booster hose. assuming it's not a mechanical issue.
 
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