Alexio Auditore

If the absolute throttle drops along with engine load, then isn't that an issue with the throttle? The absolute throttle climbs and drops way slower than throttle, its inaccurate, but you can still see it drop. The picture below is an example. The load drops to zero during a shift and it takes seconds for it to register the throttle dropped. It's only happens on the log, it drops right away when I let off the pedal. (Hope that made sense) Everytime I experience the surge or deal spot problem, the engine load drops, BUT so does the absolute throttle, it just takes a second to register on the data log. I hope it's not the ecm, but if it is, then what can you do. I'm guna try what @dripley said with the wires and see what that does. I don't want to throw unnecessary money away, but I'd almost just throw a timbo on it to see what happens before dropping a lot more to rebuild a ecm unless its 100% the ecm that's the problem

Lol, I'm the same way, makes sense to me, but no one else. I'll give that a try, I'm electronically challenged myself, but I'll see what I can do. Thank you

Yep, nv5600. I kinda figured that when I saw the throttle drop, but it makes me wonder if that means the apps is the problem

So the first picture was the worst I felt it. I left work and was going up hill from the job in first, I could feel the truck surge, even tho my foot hadn't moved. The problem I see with this app is that the absolute position doesn't change as immediately as engine load. If I let off the pedal, the load drops immediately but it takes quite a bit longer for the absolute to register it has no throttle, not sure why. The other thing I have seen is when the truck is hesitating or surging or whatever it's doing, both load and absolute drop, even though my foot hasnt let off the pedal at all, if anything I'm pushing a little more into it. That's why I feel the apps is the issue, but it's just a guess. The second picture from the blue line forward is my crusing around 50, but you can audibly hear the load of the engine changing, and the same is seen with the absolute position, its fluctuating even though my foot is staying solid. I did put it in cruise at another point, (not in included in the graph) the absolute position drops off and the engine load stayed consistent, it wasn't giving me any problems then

Will do, I'll post it tomorrow morning

If it's not the apps then what else might it be? It doesn't zero out, but it's like it stops giving it the fuel I'm demanding from it. Kind of hard to explain

Ok, this was my first trip of the day. This was me getting on the the freeway. The orange are my shift points. The red is the sudden almost lack of power I have been experiencing, or dead spots I call it. It climbs like normal in rpm, then just slows way down, you can hear the turbo whistle less like I stopped pushing the go pedal. It wasn't bad today, tomorrow morning on my way to work I will test again, that is when it really acts up and is noticable. I did the test with the truck off, and it climbs up all the way to 100 smoothly, holds there, then drops when I let off of it.

Ok. I still haven't found it then. What I mean is the app doesn't have a tps section. It has a log portion where you can watch your speed, mass air flow rate, and then you can add a acell y and z. Unless I'm totally missing it, I haven't seen anything labeled tps. ( this is all through the app on android by the way) That being said, I used this accel x and z, it does almost drop or flatten out when i hit those dead spots i talked about earlier. Where is the tps monitoring part on the app? I hope I'm not coming off rude, I'm just a bit lost with this thing, should be simple, maybe it is, I'm just slow Oh wait! Is it absolute throttle position in the logs section? Bingo I may have found it!

I got that part figured out, but I'm not seeing acceleration monitor or percentage. I see the log part, says accel x and accel z. Is that it? Kinda laggy tbh when it's monitoring

Ok so I got the obd link today, i have no idea where to monitor the apps sensor readings.

Did you check for something blocking the exhaust side like @IBMobile suggested? What does the airfilter look like? Is something blocked on the intake side also?

I ordered the obd kx. Should be here tomorrow but maybe out of town a few days. Did a ac noise check w/o warm engine and everything turned on(radio, ac, no grids tho too warm) was between .045 and .05. I'm curious to see if it will read higher when the grids do kick on. If it does, depending on how much, I'm curious if that will eventually start messing with things. Just a side thought though. I'm hoping to do the @W-T wire upgrades within the month. First is figuring out the go pedal issues

Will this work to monitor the throttle? http://www.obdlink.com/lxbt/ None of the auto parts stores will let me borrow it out of the parking lot, and others don't have it. So I have to buy one, I just want to make sure it is the right one Side note, 75 degrees today, when I drove the truck I didn't notice the dead spots, but it was cold this morning and was acting up pretty bad. Why would the cold affect this?

Thanks Ed. Cheaper than I thought. If the apps is bad, I'm definitely getting a Timbos, no worries there.

Ok. I'll give that a shot and list the results. If they don't have one or won't let me drive off the lot with it, how much does it cost to buy one?

Ok. What am I looking for in particular when its connected?

Just a Scan tool from an auto parts store?

So it's been this way for a while, but recently seems to have become more noticable. I live off the freeway, so in the morning on my way to work, I am accelerating up the freeway on ramp, usually mildly, and it's like I hit dead spots in acceleration, adding more go pedal will accelerate, but unless I romp into it more aggressively, I'll hit those dead spots until I'm up to speed. Now I notice it even If the truck is warm and on flat ground from light to light. Other thing that may go with it ... If I'm driving say 55-60 in fifth around 2k rpm and going slightly downhill, I'll use the motor to slow me down, but I keep slight pressure on the pedal to keep at a steady speed(so that I'm not slowing down to much.) When it's in that between state I guess I'll call it, where its coasting or adding fuel, it's like it can't decide what to do, you can hear the motor start adding fuel and then not quickly alternating back and forth( it doesn't cause extreme bucking or anything like that, maybe slight, rpms don't change, its just doesn't sound right to me. My dad's truck doesn't do that, really no vehicle I've driven has. -My ac noise is .03. -I've done a re-calibration before, it may have temporarily helped. -No codes thrown -the truck has surged a few times very intermittently when cruise is set, it seems to do it when the ac is on? I'm not super techy when it comes to electrical things either, I have a volt meter, but that doesn't mean I know how to use it lol Any help is greatly appreciated.

@Mopar1973Man Did you get your 27mpg mark with the comp box you had before? I know the quad allows a lot of customizing and smoke control (the smoke control I can appreciate greatly), but it seems like it hasnt paid off at least when it comes to high mpg numbers. I'm running the ez for now, plan to upgrade hopefully this summer either comp or quad, I have seen close to 22, just yesterday was 21.5 from here to Spokane cruising 70. My dad has a 99. He swears he has seen 26, and he isn't a bs kind of guy. He has done nothing to his truck besides a clutch. Bone stock.

So could could his coolant temp sensor be the cause of his rough running truck?

Ok. So have you checked under the hood on driver's side to see if the pump is connected? (I'm assuming you bought the truck with lights on, and maybe previous owner unhooked the pump because it was continuously running with truck on or off.)((mine does that, bad abs module))

Did the light come on and the abs isn't working or is it causing the pump to run and you had to disconnect power to shut it off?

Ya, usually it throws a whole bunch of codes to like everything else is wrong. Hopefully someone can tell us if a bad coolant sensor can cause problems like your seeing.

I'd just hate to see someone throw a 1000 dollars into a rebuilt ecm and have that not be it. And does the high idle plug into the air intake sensor and not the coolant sensor? Or is it both? Also, did you ever get an accurate read on your older alternator since it was spiking everywhich way with the voltmeter you were using? I do know that if it was bad to begin, the damage is done to the ECM and unhooking grids and changing alternators won't fix what's already damaged.

This is probably a really stupid question , but can a bad coolant temp affect anything else with how the truck will run? I'm just thinking simple minded, but I know it can affect the way other vehicles can run if its bad, just not sure if it's the same with our cummins. Genos garage has it for like 11 bucks. But the wiring should also be checked for any cuts too. I did a quick search about the coolant sensor and a guy had symptoms similar to yours, rough idle, missing, so on. Ended up being the sensor, despite passing a voltage test too.