ferrariowner123 Posted July 18, 2012 Share Posted July 18, 2012 So recently i have noticed a very strange issue with my pathfinder. When i first start it up it does its normal start up procedure of revving just under 2k and its suppose to calm itself down once its warmed up. But what has been happening is it will sit at the 2k idle when i depress the clutch, and say the engine is at 1600rpm coming up to a corner, and I depress the clutch, it shoots up to just under 2k. It doesn't really affect general usability but i think my MPG has taken a small hit (but i think it my driving habits, which changed right around when i noticed the change) and my shifts are not a smooth as they once were. the thinking is the engine has a minor mind of its own between shifts. One day while having the clutch depressed going down hill, i had the idle bouncing between 1400ish and 1950, going down hill with no load on the engine. Im thinking Throttle Position Sensor, but could it be something else, i can try and get a video hopefully describing the issue im having clearer than i can. Also, after taking the old girl out for a little trail bashing i developed a small whine that is only audible from 20-36ish mph and then you cant hear it, so its speed dependent not RPM that i initially thought was coming from the transmission, but after further inspection i found nothing indicating a hit on the lower chassis braces. a friend suggested that it might be a wheel bearing and that due to the rattling from the trail, it could have just finally let go. I just hit 125K Thoughts? Thanks for the help. -Kyle Link to comment Share on other sites More sharing options...
devonianwalk Posted July 18, 2012 Share Posted July 18, 2012 You can check the bearing by jacking up the front and, placing your hands on the top and bottom of the tire, shake the wheel. It should not move at all. Link to comment Share on other sites More sharing options...
mluczaj22 Posted July 18, 2012 Share Posted July 18, 2012 any codes? Link to comment Share on other sites More sharing options...
ferrariowner123 Posted July 18, 2012 Author Share Posted July 18, 2012 You can check the bearing by jacking up the front and, placing your hands on the top and bottom of the tire, shake the wheel. It should not move at all. Alright ill do that before i get my new wheels mounted. any codes? No, that's the strange part, i have no warning lights of any kind, not that im complaining, (who doesn't like turning their car on to find you live in a gremlin free neighborhood ) but in this case i wish their was one, because it sure would make life easier. lol Link to comment Share on other sites More sharing options...
pathfounder Posted July 18, 2012 Share Posted July 18, 2012 I would check the throttle linkage for sticking. You might have a bad MAF. The ecu will pretty much take the MAF's output as the word of God and not throw codes for it. Link to comment Share on other sites More sharing options...
ferrariowner123 Posted July 18, 2012 Author Share Posted July 18, 2012 I would check the throttle linkage for sticking. You might have a bad MAF. The ecu will pretty much take the MAF's output as the word of God and not throw codes for it. Is there anyway of diagnosing that for sure? I was able to get a video of what's going on, hopefully that will help, but it will have to wait for a few hours till I get home. Link to comment Share on other sites More sharing options...
ferrariowner123 Posted July 19, 2012 Author Share Posted July 19, 2012 You can check the bearing by jacking up the front and, placing your hands on the top and bottom of the tire, shake the wheel. It should not move at all. So i checked the wheel today, and they are solid however, the drivers side when spun has a fair amount of resistance to it, not so much that you can spin the wheel (of course) but it comes to a stop very quickly. Probably new bearing it sounds like? any other ideas? Link to comment Share on other sites More sharing options...
pathfounder Posted July 19, 2012 Share Posted July 19, 2012 The wheel stopping is probably more likely just the brakes. You'd have to take the caliper/pads off and try again to be sure. As for testing the MAF, I don't know a way to do this. You'd need a scope or a new one to compare the difference with. You can narrow down the noise a bit more by taking off the drive flange on the suspect wheel. If the noise goes away, it is not your wheel bearings, and instead is either a cv joint or part of the differential. Link to comment Share on other sites More sharing options...
ferrariowner123 Posted July 19, 2012 Author Share Posted July 19, 2012 Well i was able to get a video posted. Sorry for the shortness, and it may not be the right way up, (should be though) and TERRBILE audio, sub was turned all the way down, still sounds like a night club. probably because it was on my phone. But context is i was going down a hill with the clutch pressed in, and it did the bouncing the WHOLE way down. [media=] [/media] Link to comment Share on other sites More sharing options...
silverton Posted July 19, 2012 Share Posted July 19, 2012 You can test a wheel bearing with the vehicle on the ground. Just push in on the top of the wheel you want to test like you're trying to rock the vehicle. if you hear anything like a knock or a click, then the bearing is not pretensioned properly, or it's bad. Link to comment Share on other sites More sharing options...
mluczaj22 Posted July 19, 2012 Share Posted July 19, 2012 thats looks to be tps Link to comment Share on other sites More sharing options...
ferrariowner123 Posted July 20, 2012 Author Share Posted July 20, 2012 thats looks to be tps Even with no codes? it has to know their is fault. Link to comment Share on other sites More sharing options...
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