throttle position pedal position very choppy

**clinter36** · 03-23-2016

Hello,

Very new to this whole thing... Just received VCM Suite and have started logging/scanning. The vehicle is a 2011 Silverado 2500 6.0L

Please take a look at my log. If you look at the top time graph, look at how choppy the pedal position is. Its easiest to see at the very end of the file where I am idling for 10 secs or so.

This can't be normal? Any thoughts? thanks for your help.

Clint

log3.hpl

**5FDP** · 03-23-2016

Hmm, that is interesting.

I've never seen one be that active before, it sure does change alot even though it always less that 1-2% at the most.

I wonder if it really dirty on the back side of the blade. It wouldn't hurt to remove it and clean it and clean the MAF sensor aswell.

**clinter36** · 03-23-2016

The back story is that I have been unhappy with the light throttle acceleration of this truck since it was new. It has been to the dealer many times and they finally told me it was the TCC locking / unlocking that I was feeling (normal). Then it turns out there was a TSB regarding faulty throttle position sensor (or some part of that system). I took it to the dealer for that, but since I wasn't throwing a code they basically said they were going to charge me $100 to diagnose and it probably wouldn't be covered under warranty. I am wondering if this is what I am seeing... but I find it interesting that it appears to be in the pedal sensor and maybe that is translating to the TPS. I am so new to this its difficult for me to really understand what I am looking at.

Clint

**GHuggins** · 03-23-2016

With the V3 scanner, I almost consider this normal... I've seen way worse with this new scanner because of how it "self integrates" readings... I've got a O2 readout that looks like shark teeth going up and down as it's switching voltage - literally a triangle formation that follows the O2 voltage up and down... Wish they hadn't done this with the new scanner - can't trust anything I see anymore... In fact I'll post the last log and you tell me if it's normal. Scanner also is showing 0mv for one O2 that's switching and working correctly via different scanner.

**GHuggins** · 03-23-2016

You can fix your throttle issues via the tune...

**clinter36** · 03-23-2016

Originally Posted by GHuggins

You can fix your throttle issues via the tune...

Haha....I hope so.

Yes, you definitely have the shark teeth. I am not sure I understand the reason, but i'll keep loggin and learning....

thanks
clint

**schpenxel** · 03-24-2016

Is that throttle PID for the pedal or for the blade? Is there a reason that can't be right?

**10_SS** · 03-28-2016

I also get the saw tooth data pattern for TPS on my 2010 Camaro E38... however it's in the other direction (up, not down) and it's not as severe. The Channels data doesn't change... just the chart.

**clinter36** · 03-29-2016

I have done quite a bit more logging and have not seen it... I think its an artifact of the software and not the voltage changing rapidly.

Thanks for the input.

clint

Thread: throttle position pedal position very choppy

Thread Tools

throttle position pedal position very choppy