Please help!! - Nissan Xterra Forum
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#1 Old 12-22-2012, 08:42 PM
slowxsc
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Please help!!

Hey guys im a owner of a 2002 xterra supercharged. I know this has been discussed lots of times but ive done everything on my X but for some odd reason my truck has still been in fail safe mode or boost drop. Ive replaced knock sensor, knock sensor harness, spark plugs, spark plug wires, and timming belt and its still on 2 pounds of boost or it runs on 8 pounds then boost drops back to 2 pounds. If someone can please help me on what to do i would really apreciate it thanks.
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#2 Old 12-23-2012, 01:50 PM
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Are you using premium 91 or 93 octane fuel only? Did you do a knock sensor relocate or replace it on the block? Can you pull obd2 codes and post? What's the status of the fuel filter? The notorious distributor bearing? Did you properly set the timing after the belt change? We'll need a few more clues.
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#3 Old 12-23-2012, 02:32 PM
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Hey i use 93 always idk about the fuel filter i will replace that. The truck isnt throwing any codes and i put the knock sensor back into the block.
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#4 Old 12-23-2012, 02:51 PM
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did you get codes read or are you just assuming no light = no codes? There are several that won't trip a light.
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#5 Old 12-23-2012, 02:54 PM
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Yea it has no light but i also looked for codes and nothing.
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#6 Old 12-23-2012, 03:55 PM
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Another idea is a vacuum leak on the supercharger bypass actuator, maybe a perished rubber hose (check the really short and small hose on the top back of the supercharger. They are known for getting cooked.) Test the actuator and see if it holds a vacuum as well.

I've got a 2003 s/c and have been down this path-hang in there, you'll figure it out.
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#7 Old 12-23-2012, 04:08 PM
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Thanks i really apreciate it. So what was the problem with yours? Btw i was thinking about the resistor mod would that help any?

Last edited by slowxsc; 12-23-2012 at 04:27 PM.
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#8 Old 12-23-2012, 06:16 PM
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Go to your fuse panel by your knees an look for a fuse called A/C Cont. garentee you its blown. i have yet to understand what blows it, but happens to me.
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#9 Old 12-23-2012, 06:29 PM
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Hmm let me check
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#10 Old 12-23-2012, 06:46 PM
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if you say it feels like its in a safe mood thats probably the main cause is that little fuse. but it could be something else, but mostly that little fuse.
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