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Discussion Starter · #1 ·
So I am having trouble finding a solution to this, but it might be a matter of how to word what I am putting in the search bar but here goes.
So this started when I had my drivers side cam position sensor go out. Threw a code, bought a new one from oreillys, installed, thought I was good. So fastforward a couple weeks and as I am going down the road in 4th 5th or 6th whenever I put my foot down the truck will have the rpm wander before taking off. This happens anywhere from about 2500 to 3000. Pedal to the floor and the needle will waver up and down then pick a spot and take off from there. And its not just the gauge because you can hear and feel it.
When I got the truck I had to change the crank position sensor but that was about a year ago.
The truck has a hypertech tuner but that has been on there for months before this and I already tried uninstalling and re installing.
I also warrantied the new cam position sensor and replaced it with no change.
My battery was going out so I replaced that too.
My last idea was that the new sensor was throwing off the opposing passenger side cam sensor so I have a matching pair on their way.
Also have a set of plugs coming because I havent changed them.
 

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Yr, engine, trans & mileage?

Most have far better luck w/ OEM crank/cam sensors as opposed to an auto parts store brand.
 

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Discussion Starter · #4 · (Edited)
Its a 2011 with about 110k miles. V6 and manual trans. I havent gone looking for a vacuum leak but I ordered good ntk sensors to try. And ordered the pricy oem style ngk plugs. Should have all that on tomorrow. Also this is not throwing any codes since the initial drivers side cam sensor.
 

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You sure that's not a bad clutch? The RPMs should never fluctuate at all while you're in gear, moving at consistent speed. And I'd get some OEM sensors. NTK might be fine though I think OEM is Hitachi in many cases? I'm not 100% sure but I see the best track records with 100% OEM.
 

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I was thinking clutch as well.
 
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I personally think it has less to do with the cam position sensors and more to do with the transmission as well. I'm guessing since you mentioned 6th, that you've got a manual transmission truck. It honestly sounds like the clutch is slipping. Do you have any oil leaks under the truck? This is just a shot in the dark, but i have experienced transmission slippage and it's usually more pronounced in the higher gears since there is more load on the driveline
 
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I personally think it has less to do with the cam position sensors and more to do with the transmission as well. I'm guessing since you mentioned 6th, that you've got a manual transmission truck. It honestly sounds like the clutch is slipping. Do you have any oil leaks under the truck? This is just a shot in the dark, but i have experienced transmission slippage and it's usually more pronounced in the higher gears since there is more load on the driveline
Yep, number one test for a clutch is to throw it in the top gear and floor it. The lower the speed you try at, the better Makes a bad one pretty obvious pretty quick.
 

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Discussion Starter · #11 ·
Im not sure how to upload a vid directly. But if I have it at say 2500 rpm and put my foot down, it will go to 3000 then 2400 then kind of take off.
What is the best way to see the clutch? Just through the cover by the slave cylinder?
 

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Im not sure how to upload a vid directly. But if I have it at say 2500 rpm and put my foot down, it will go to 3000 then 2400 then kind of take off.
What is the best way to see the clutch? Just through the cover by the slave cylinder?
Oh, that does sound like a slip and then grab on the clutch.
 

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Discussion Starter · #14 · (Edited)
So I started watching videos where people had slipping clutches and it seems a lot more exaggerated. Like mine slowly moves up 1000rpm or so and these with slipping clutches are jumping like 4000. Plus it doesnt really feel like it ever really lets go
 

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Most have far better luck w/ OEM crank/cam sensors as opposed to an auto parts store brand.
Yeh, I don't know if it's related to this particular problem or not - But the out-of-the-box reliability of most aftermarket sensors is ABSOLUTE CRAP.

If I had a nickel for every story I've heard about someone installing a sensor he bought at Auto Zone, OReillys or Pep Boys - and then having all kinds of problems with it - I'd be a ballah living on a superyacht in Dubai.
 

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Discussion Starter · #16 ·
Yeh, I don't know if it's related to this particular problem or not - But the out-of-the-box reliability of most aftermarket sensors is ABSOLUTE CRAP.

If I had a nickel for every story I've heard about someone installing a sensor he bought at Auto Zone, OReillys or Pep Boys - and then having all kinds of problems with it - I'd be a ballah living on a superyacht in Dubai.
Guess we'll find out today. Also the reason I don't think its a clutch is because I can just hold my foot down and it acts right
 

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Yeh, I don't know if it's related to this particular problem or not - But the out-of-the-box reliability of most aftermarket sensors is ABSOLUTE CRAP.

If I had a nickel for every story I've heard about someone installing a sensor he bought at Auto Zone, OReillys or Pep Boys - and then having all kinds of problems with it - I'd be a ballah living on a superyacht in Dubai.
I second that! Two sets of both cams and crank in one month, last month. Crap quality these days.
 

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Pedal to the floor and the needle will waver up and down then pick a spot and take off from there. And its not just the gauge because you can hear and feel it.
When your engine revs increase, but your driveshaft revs stay the same... it's the clutch.
It's not a sensor, no matter where you bought it or what brand it is.

You should try a pedal free-play adjustment first, but if it's just worn out,
there's not much left to it, so it will very quickly deteriorate from here.
 

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When your engine revs increase, but your driveshaft revs stay the same... it's the clutch.
It's not a sensor, no matter where you bought it or what brand it is.

You should try a pedal free-play adjustment first, but if it's just worn out,
there's not much left to it, so it will very quickly deteriorate from here.
I second that as well. That is the most common cause of that symptom in my opinion. Also, faulty sensors result in erratic/dramatic rpm variations. Clutch or slipping auto will certainly be smoother variations. I would think its an obvious feeling in the seat, but maybe not.
 

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Discussion Starter · #20 ·
So my reasoning on hoping that its not the clutch is that it only wanders about 1k rpm instead of flying way up, I can hold my foot all the way down and it will tix it self, and that if I keep it high in the rpm range like doing a pull, it doesnt wander no matter what gear.

On the downside looking into a clutch price had me find the jwt flywheel. So now I want that for the performance. :unsure:
 
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