trags13
12-04-2007, 09:26 PM
Ok,
I a 03 SC X I can't say anything bad about it.. but it just dosen't seem to run like the other X we own. It seems to have no power, it surgers on and off at full throttle under acceleration, bogs at take off and it doesn't like to down shift at full throttle. no CEL showing and no codes a showing up in the ECU or the trans computer, I was thinking that the problem was the knock sensor retarding the timming.
Any input?
Anthony
12-05-2007, 07:55 AM
What octane gas are you running?
F150Boss86
12-05-2007, 07:59 AM
that was my guess on the fuel grade/quality...any knocking? maybe youll be lucky with just some injection cleaner
k1w1t1m
12-05-2007, 07:59 AM
The knock sensor still will show as a code even though it doesn't light the CEL. The KS is also a one trip deal...in other words it resets after every trip so you will have to check for codes before turning the vehicle off after a trip.
trags13
12-05-2007, 05:00 PM
Ok, the knock sensor code did show up as bad in the ecu. thanks of the help!!!
json3904
12-05-2007, 05:43 PM
but that wont cause the problems you are having i have been running my X with a bad knock sensor for a long time and i still have full power.... if i stomp on it it goes, with no problem.... the only thing i have with it is when im sitting at idle it hesitates......
trags13
12-05-2007, 09:07 PM
Ok......... Any ideas??? I'am tapped out... i also had a code for a high volt on the IAT
Where is the knock sensor hiding?
json3904
12-05-2007, 09:55 PM
under everything on the top of the motor..... thats why i havent changed it out.... the part is about $110 depending on where you go.....
k1w1t1m
12-06-2007, 09:01 AM
Trags13 has a SC so it will make a difference and put the SC in bypass mode. The KS is in the valley under the lower intake manifold.
http://www.supermotors.net/getfile/437955/fullsize/xterra-005.jpg
It makes a difference on NA engines too as the timing doesn't advance like it should. However apart from a small mpg impact and a couple of HP you don't really have to worry about it. On NA engines bypassing the KS with a 560Kohm resistor works well. I would replace the KS on a SC engine. It is there for a purpose. I know of one person who has bypassed the KS on a SC engine. They report good results but YMMV.
json3904
12-06-2007, 06:09 PM
is there anyway to bypass it with out having to take everything off??????
k1w1t1m
12-07-2007, 08:44 AM
is there anyway to bypass it with out having to take everything off??????
Here you go
http://www.nissanoffroad.net/messageboard/index.php?topic=1921.0