Me78569

PCM handles all trans functions. The ECM is purely limited to engine control. Trans slipping at that high of a speed suggests a overdrive issue. I doubt your issue is a computer issue.

wow, crazy stuff. 8/10/20 produced some bad storms. we had a tornado on path to hit our place but thankfully it died before it gained any steam. glad you are ok.

K02's have some pretty bad ratings for a HD trucks. They wear pretty fast from what I have read. I am trying to deicde between AT3 xlt's and duratrac's for my truck. Do you need snow rating?

I've never seen a 3rd gen LED bulb that didn't scatter light horriably. Honestly some of the most unpleasant blindings I have had have been from a 3rd gen OEM housing with LED bulbs. Not sure what it was related to but I've not seen a good setup with PNP setups.

I like to use a plastic putty knife so I don't damage anything. I dont know that there is an "easy" way.

like others said maintence is key. The motor might be a " million mile" motor, but the rest of the truck is nothing special. Old vehicles wear out.

bad map sensor or a short in your map wiring. i had this issue without a cel.

Welcome, nice to see more 4th gen people coming around.

Its time to put new tires on the 4th gen. the current tires are good for highway summer driving and have ~%25 wear left however winter is going to be coming and the wife will need better traction. I bought a 2nd set of rims stock 4th gen 275/70/18 tire size. I have been looking at a couple tires, but I need some input. Things that are important to me are wear life, cold weather traction, snow traction. we dont tow much right now, but it will be happening again soonish. I expect to see %95 paved road driving, but I do have a ~1 mile long gravel driveway. so far I have looked at Goodyear duratrac 275/70/18 load E - looks like a good all around fit. BF goodridge TA k02 - looks good on papre, but reports are that they wear quickly with the K02 model GRABBER A/TX - good reviews DISCOVERER AT3 XLT - had a set of AT2's on my old truck and winter traction was not great.

I believe it should be voltages between 4.5 and .5 voltage. I dont remember if the sensor is a pull down or pull up sensor. So at 0 psi I would expect to see either .5 or 4.5v, then as boost comes up I would want to see voltage change. I've never been able ot have hands on a truck that does what yours is doing so I am only guessing, but maybe the 5v bus is off causing that 0 psi reading to hold on longer? I dunno.

Consider the useable life of the vehicle vs the cost. 200k miles vs 60k miles is a no brainer for me.

If the part is bad I would replace it. Were there codes for the apps?

You can't blindly set apps voltage, they are calibrated by the manufacturer. My guess is you set the voltage way to low and you are having to increase tps to ~10-20% before the IVS ( Idle validation Switch) is disabled and fueling occurs.

Is it a stock style apps? If so you should not set those to voltage as they have a multi part system for knowing when at idle state.

Follow the tuning guide steps.

Yes. Couple of guys tuned down 7 x .011 and .012 to run with a hx35

I wouldn't bother it's just the ecm being the ecm. No real issue.

Semi normal with big injectors and a tune. The ecm is in control at this point and it is trying to manage rpm vs fuel. The ecm is programmed to think it needs xx% duration to keep idle. Bigger injectors means it only needs yy% so it drops fueling but it overshoots then fuels harder and then overshoots and repeats

Its awesome when you get to experience something like that with no one else there.

However there is an issue if the ecm is not seeing good boost reads. My truck was perfectly accurate until ~25 psi. question is would low 5v source to a 5v reference sensor cause a lazy map read? Maybe a damaged voltage regulator on the 5v bus?

The main thing is below 16 psi. When boost is below 16psi the quadzilla is reading the canbus message and sniff out the reported boost number from the ecm. It is NOT reading the sensor directly. In situations below 16 psi where boost on the quad is not matching a mech gauge we know for a fact that the ecm is not getting an accurate read from the sensor or the ecm is not reporting an accurate read on the canbus. This is not a quad issue rather an issue somewhere else in the system. Boost numbers over 30 psi not being accurate are not really a big issue.

the issue is the ECM isn''t seeing accurate boost. That's where the fueling starts. you can tweak the bottom end to make up for this, but you will loose a lot of smoothness.

Issue here is until 16 psi the quadzilla is reading %100 of the boost value from the ecm rather than the sensor. The value you see on the quad is what the ecm is seeing for boost. I have seen this a few times before, but I dont remember what solution if any there was. a move agressive fuel curve will help the power, but the root issue still exists. @mopar1973man what would be the cause of a lazy map sensor in terms of voltage? I can't remember if it is a pull down or pull up sensor? could voltage be low on the source 5v wire and cause this? or maybe voltage loss on the sense wire? or a poor ground?

how are your ujoints?

yep bugs are getting better now. If I am over your way I will stop by. we go to thief river falls from time to time to see my grandma.