Please help!! - Page 2 - Nissan Xterra Forum
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#11 Old 12-23-2012, 06:48 PM
slowxsc
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Hey i only see a A/T cont fuse down there.
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#12 Old 12-23-2012, 06:54 PM
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Crap .. its called A/T Cont. sorry heres a link for more info from this site..
http://www.clubxterra.org/forums/showthread.php?t=35421
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#13 Old 12-23-2012, 07:30 PM
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Lol i looked and all the fuses seem to be fine.
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#14 Old 12-24-2012, 04:24 PM
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My failsafe boost issue was caused by a bad knock sensor so I did the Maxima knock sensor relocate to the supercharger, which didn't fix it, so I looked for other issues. I chased down a leaky vacuum line on the s/c bypass actuator, and found an intermittent spark plug wire. It appeared that all was in order, so I was stumped, as it was still dropping boost. Then I read that the superchargers can be noisy which can set off the knock sensor. I decided to dampen the KS by mounting it off a 1"x3"x1/8" aluminum bar, right to the s/c. Problem solved. I didn't do the resistor mod because I was concerned about predetonation killing the engine, since there would be no feedback to the ecu.

As for your situation, it would seem that the ecu is detecting a knock, maybe from a lean condition. Is your MAF sensor clean? (be careful when cleaning if you do, as they are very fragile and expensive)
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#15 Old 12-24-2012, 04:31 PM
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Also, did you properly torque the KS and ensure it had a good ground when reinstalling? (The bolt through the center of the KS is also a needed ground)
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#16 Old 12-24-2012, 04:46 PM
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Ok, one more thing comes to mind. With the supercharger belt removed, is there play with the small s/c pulley? Does it make a knocking sound when you spin it? It has a plastic connector drive inside that could be worn as well. It is replaceable.
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#17 Old 12-24-2012, 09:14 PM
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Thanks rocky. One thing i did notice today that it only boost drops when im at WOT if i drive it like a "grandma" it will still boost 7 -5 pounds. Btw my mods are cut out muffler and intake.
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#18 Old 01-07-2013, 10:04 AM
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So guys i decided to do the resistor mod and the truck runs great now.
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#19 Old 07-22-2013, 10:34 PM
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Any issues since having done the resistor mod earlier in the year?

I also suffer from this issue. 02 SC X Bone Stock

Makes me want to sell it because I cannot stand how weak it is and getting 15 mpg...if it ran normally 15 mpg would be worth it..
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