Nissan Repair Questions? Ask a Mechanic for Answers ASAP
im cam, a licenced diagnostic tech.
2 things are coming to mind on your issue.
1 . wiring from pcm to the sensor connector.
if there is corrossion or a open wire, this will store and a code immidiatley. you will need to to a continuity check from sensor connector to the pcm.
i have seen bad bushings and bearings in the distributor on these and the knock will pick up the noise.
Tests/Procedures:1. Use a regular Digital Volt Ohm Meter (DVOM) and check for the 5.0 volts to the knock sensor with the knock sensor unplugged and key on.2. If the 5.0 volts is present, reconnect the knock sensor and backprobe and check the knock sensor voltage. Should read approximately 2.5 volts plugged in and backprobing
generally when the ses light is flashing, this is a warning that cat damage is possible.
is it running ok?
a lean running condition or misfire will set the ks code.
this could be cause from tune up condition to a mass airflow sensor causing a lean condition . fuel trims will need to be checked to determine a lean misfire
have a good look at the distributer.
i think this is the area that we should be focusing as this will cause a misfire and your lack of power.
to check the mass airflow sensor, you will need a scanner to monitor airflow and the fuel trims. they should be "0" plus or minus 2.
g/s should be about 4 to 6 and wide open be plus 60 to 80
thats grams per second
is the distributer under warranty possibly?
i can call no problem.
most other techs on this site charge for this. I dont, all that i ask is a postive rating wether you figure it out or not.
i am available for a call in a couple of hours as im not by a phone right now.
1 thing to check before that is fuel trim.
can you see the trims?
there should be lt for long term and st for short term
if you hold full throttle snaps, can you capture maf rate and ft?, might have to do it a couple times to capture
justa couple full throttle snaps while monitoring those items
those reading are a little low for the maf. its about a 1/3 of what it should be.
its either the scanner itself is just not quick enough to catch the reading , the mass airflow sensor is faulty or the cat could be plugged .
i think we should focus on the distributer and if that noise is coming from is or not.
if you suspect it is than while its still under warranty , replace it to eliminate it as the source of the problem.
the idle fuel trims arent too bad, but full throttle trims should jumo to "99" on the short term. so it still could be a distributer problem or the mass airflow sensor
those are bank 1 and bank 2.
1 and 2 should always be relativley equal on both st and long term.
"0" i a perfect fuel mixture
Hello my name is ***** ***** thank you for your Question.
Cameron Brookhouse has opt'd out cause he feels he can no longer help you. So I will be taking over this question.
What brand spark plugs do you have in the truck? Also how did you relocate the knock sensor? I have seen this done and work and not work. The key thing is the shielded wire. If that is not wired properly you can continue to get knock sensor codes also. But then again, if you are getting P0300 that can cause the knock sensor code also.
Let me know..
Do you recall what brand plugs were in this engine before you changed the plugs?
The reason is cause these engines are very sensitive to the spark plugs used. These engines only like NGK spark plugs. When any other spark plug is used, you can get misfire codes. Of course if you have a misfire issue, it can produce a knock sensor code.
Also, the distributor you installed, did you get it after market?
You may need to get a Dealer Distributor also. I have had After Market ones not work a number of times brand new out of the box.
You need a Oscilloscope to monitor the signal from the distributor to know for sure.
I would perfer a used Distributor that is OEM verses after market.
So yeah, give that a try.
Let me know how you make out.
A Oscilloscope is expensive. It would be cheaper to have a shop that has one check the signal for you.
You got it!