Fueling issues, dual cp3 belt slip, maxed out 165?

[LSxBakakos]

I’d be checking that. We need to make sure supply is consistent. Dont throw a bigger pump at it yet, i cant see you taxing that 165 yet.

10-4, ill figure out a way then, just dont wanna keep flogging it on the banana rod tune, hopefully I can log it and get some usable data. I remember looking down during the pass and remembering right around 100 was when it flat lined.

You read it right, both actual and desired dropped off. I would look at all the tables that would limit fuel pressure. Then log those tables and see what’s happening. Could be a bad sensor or wiring problem.

Bad sensor as in a fuel rail pressure sensor or the harness to it?

 

[2004LB7]

If I remember correctly, the compensation or modifier tables includes AIT, ECT, Fuel Temperature and Baro. There may be others. But if you have any of these sensors not reporting correctly then it could falsely report that one or more conditions is outside the normal operating range and pull fuel pressure

Look in your tune for the fuel pressure and note all the modifier tables and log those along with desired and actual fuel pressure. See if any correspond with your drop in pressure

And as James mentioned, monitor your LP pressure too so you can see if you have any issues there as well

 

[LSxBakakos]

If I remember correctly, the compensation or modifier tables includes AIT, ECT, Fuel Temperature and Baro. There may be others. But if you have any of these sensors not reporting correctly then it could falsely report that one or more conditions is outside the normal operating range and pull fuel pressure

Look in your tune for the fuel pressure and note all the modifier tables and log those along with desired and actual fuel pressure. See if any correspond with your drop in pressure

And as James mentioned, monitor your LP pressure too so you can see if you have any issues there as well

I appreciate all the help guys, thing is driving me insane. As far as my tunes they're locked so I won't be able to get into them to find the values. Ill log the ones you listed and hopefully find the values for them. I think the last time the baro failed was when I pegged over 50psi of boost. Ill definitely have my homework this week lol

 

[2004LB7]

With Efilive you can open a stock tune file of the same OS as you have and view the individual tables and modifiers. You can use that to know what pids to log. Otherwise just log what I mentioned and whatever else looks like might be related

 

[Chevy1925]

I guess we need more clarification.

Was desired matching actual the entire time but desired had dropped to 12k?

Or was desired at 23-26k and actual matched until over 100mph when actual was at 12k and desired was 23-26k still?

 

[LSxBakakos]

With Efilive you can open a stock tune file of the same OS as you have and view the individual tables and modifiers. You can use that to know what pids to log. Otherwise just log what I mentioned and whatever else looks like might be related

Unless I can meet up with my tuner I only have access to hptuners, either way I can at least log the parameters and compare them to whatever data I can find

I guess we need more clarification.

Was desired matching actual the entire time but desired had dropped to 12k?

Or was desired at 23-26k and actual matched until over 100mph when actual was at 12k and desired was 23-26k still?

Ill need to watch the log again, if my memory serves me right it was holding 8-10 on launch, 26k at wot until maybe 900-1000ft, then it seemed desired and actual both either were "delayed data" or both of them dropped together and continued to plumet until it came back up. I know my tune is "detorqued" on the banana rod tune but both videos show the difference in smoke output indicating there was some sort of fuel starvation on the last pass.

No idea if it matters(just thinking out loud) I did have the velocity stack on, we had an air quality warning from the Canadian wildfires, and a wheel liner got partially ripped out on a pass. Is it possible a weird draft/unmetered air or air quality can mess up the maf reading? I've always been under the impression velocity stacks redirect/transition air, im unsure what running one would do for the maf scaling table, and unsure if the Hitachi is original to gm or aftermarket junk

 

[darkness]

I’ve been thinking it might be boost related. In my ‘02 pulling a trailer and hitting a grade, it would go into limp mode and just fall on its face. But after a few seconds it would wake back up again. If I remember it was over boosting. This was 3-4 years ago and don’t remember if would throw a code but do know I had to log it to find out what it was doing.

 

[LSxBakakos]

I’ve been thinking it might be boost related. In my ‘02 pulling a trailer and hitting a grade, it would go into limp mode and just fall on its face. But after a few seconds it would wake back up again. If I remember it was over boosting. This was 3-4 years ago and don’t remember if would throw a code but do know I had to log it to find out what it was doing.

It very well could be, the last time the baro sensor went I spiked well over 50psi, the truck was spitting at WOT down the track in 5th, oddly enough it went clean soot wise how it did this time. That last pass I was too focused on how it felt to be paying attention to my pillar

 

[2004LB7]

Unless I can meet up with my tuner I only have access to hptuners, either way I can at least log the parameters and compare them to whatever data I can find

You can download the software and view unlocked tunes like a stock one for free

 

[Bdsankey]

Do you want to borrow an AutoCal to log with? It would cost you a fully refundable deposit plus $25 in shipping (including return).

I don't know who your tuner is but it seems like you really need some hardware to get this figured out in a timely manner.

 

[gmduramax]

If your tune is detorqued could it be possible your truck is shifting to 5th too soon dropping your rpm and is pulling mm3

 

[LSxBakakos]

Do you want to borrow an AutoCal to log with? It would cost you a fully refundable deposit plus $25 in shipping (including return).

I don't know who your tuner is but it seems like you really need some hardware to get this figured out in a timely manner.

Apparently either my phone never sent my response lol. Ill definitely keep you posted and I appreciate the offer!

If your tune is detorqued could it be possible your truck is shifting to 5th too soon dropping your rpm and is pulling mm3

As far as the detorqued tune it has never flat lined like this. Im unsure how to explain it, the truck normally pulls hard, right around 900-1000ft mark it had zero pull. Best way I can explain it, years ago I was racing my buddies Yamaha 600R in my nova, tach fried a few days prior. Couldn't hear the engine over the bike, i shifted it when it nosed over. It feels like that kind of flat line 10 fold or like I had set cruise control on.

I normally won't throw parts at something but considering I'll be buying every sensor new when this engine comes out I bought an exergy rail pressure sensor as well as coolant temp, matching rear qa1s and some other odds and ends. Work has been swamped and when the weekends here I'll see what I can log and compare my parameters. Additionally hope I can shave a tenth off my 60" too, once its running right. Then again I've never had any luck logging this thing on the street for the weird 5th gear issue. Its been intermittent the past 2 years

 

[Ridin'GMC]

Just curious, how many lbs of boost are you seeing until it falls on your face? From what you're describing, it sounds similar to what I went through. In my case, it'll accelerate hard until 90 mph and fall on its face as it hits over 50lbs of boost, rail pressure would drop down dramatically for about 2-3 seconds and build back right up. In my case, it was the limp mode for the over boost in the diagnostic section in the tune. Changed that to 665 seconds and it fixed my issue.

 

[LSxBakakos]

Just curious, how many lbs of boost are you seeing until it falls on your face? From what you're describing, it sounds similar to what I went through. In my case, it'll accelerate hard until 90 mph and fall on its face as it hits over 50lbs of boost, rail pressure would drop down dramatically for about 2-3 seconds and build back right up. In my case, it was the limp mode for the over boost in the diagnostic section in the tune. Changed that to 665 seconds and it fixed my issue.

Ill confirm that this weekend. I was so set on it being a fueling issue I kept looking at my EGT's rather than boost. I know this chargers max is 44 psi. This definitely has me wondering and if it happens to be same issue it looks like I'll be headed to Woodstock soon lol. Thats definitely good to know just in case, appreciate the input!

 

[LSxBakakos]

Update, last night I had a weird gut feeling to see what the fuel looked like so drained some into a clean pan, buddy ended up filling up at the same place as I did and ended up with dpf issues. After work today I checked the bottle, no water, there is slight sediment in the fuel, whats odd is its orange/brown. Fuel has always looked green in this thing, considering my buddy has an active issue now im wondering if this sediment is really the gas station tank rusting

Today I installed the qa1s and the exergy rail pressure sensor. Tune 3/550-600rw held rail, I believe two guys may be onto something with overboost. I looked at 4th/5th gear wot and I was at 40 psi which seems higher than I remember in this tune. Tomorrow im going to replace the ECT sensor and go log. Oddly enough since the rail pressure sensor the truck seems to be idling smoother than it ever has, and seems more "snappy" down low/using less throttle to get moving, wot i can't say I noticed anything different

 

[LSxBakakos]

You might be chasing two different gremlins—possible contaminated fuel and a bit of overboost. If your buddy’s got the same problem from the same station, I’d suspect bad diesel is part of it. I’ve seen orange/brown sediment before from tanks that were starting to rust. Getting that sorted could save you a lot of trouble before it causes injector or DPF headaches. I’ve had DPF issues solved just by fixing the root fuel problem.

I do believe there's two separate gremlins as you stated. He's a 6.7 cummins, dpf issues which are now resolved after the Rislone cleaning system. He however didnt have any running issues with his unlike myself. I put in a heavy dosage of seafoam, and grabbed some tcw3 and am just about empty so I'll be changing fuel filters this week and cutting them for inspection. Since the rail pressure sensor mines seemed to idle smoother, after the seafoam it does seem to be coming back to life a little more. Life has been madness, I atill need to log the aspects that another member mentioned

As far as that station they claim their tanks are stainless. Unless its 4 series, I find that hard to believe. My guess was rust was the culprit with the color so definitely appreciate your insight on that

 

[LSxBakakos]

Well, this is something that may apply to others.

Friend sent me a YouTube video by pureflow titled "buyer beware: counterfeit filters"(for whatever reason i can't share it here). They give a breakdown on the differences, shallower than "normal" and create restriction issues. Sure enough went to amazon and clicked on my most recent purchase and its some chineseium manufacturing company. Needless to say I will not longer be sourcing my filters through the zon

 

[LSxBakakos]

Source: https://youtu.be/dihW4bDhIT8?si=KA-yiPQVnSIoSktG

 

[Bdsankey]

Source: https://youtu.be/dihW4bDhIT8?si=KA-yiPQVnSIoSktG

I don’t know if this is your issue. Is supply pressure staying positive under load?

If so, I don’t think this is a smoking gun.

Regardless, great info to know!!


Sent from my iPhone using Tapatalk

 

[LSxBakakos]

I don’t know if this is your issue. Is supply pressure staying positive under load?

If so, I don’t think this is a smoking gun.

Regardless, great info to know!!


Sent from my iPhone using Tapatalk

If im being honest i haven't had any time to dig deeper since replacing the rail pressure sensor. Thankfully I had some vacation to burn up and took this week off. I was going to replace the filters today until I recieved that video lol, oddly enough ive been buying filters from that same store for the past 2 or so years? Which was when I started having oddball issues in my other thread with the "new pb". Ill be confirming working pressure in the AD,logging what aspects a few of you have made and if everything checks out maybe race friday. Oddly enough time away from work has made me realize in the past my FPR occasionally would stick so very well could be the rail pressure loss too.

As far as the video it was shared to me and figured its only right to pass that info along on here. Im half tempted to see what kind of flow it has out of the pump. I remember feeling like it sounded like metal rubbing on the base when I screwed on the new filter last time