New guy with a 2013 Escalade ESV Premium AWD

[skpyle]

Today, I replaced knock sensors 1 (driver's side) and 2 (passenger's side).
Biggest part was finding the right angle to shove my hands in for access.
I had to R&R the front drive shaft from the front axle to get enough room to shove my gorilla paw in to get knock sensor 1 done. For torquing the knock sensors to 18 ft/lbs, I ran long extensions and had the torque wrench outside the frame rails.
It worked.

 

[Geotrash]

Today, I replaced knock sensors 1 (driver's side) and 2 (passenger's side).
Biggest part was finding the right angle to shove my hands in for access.
I had to R&R the front drive shaft from the front axle to get enough room to shove my gorilla paw in to get knock sensor 1 done. For torquing the knock sensors to 18 ft/lbs, I ran long extensions and had the torque wrench outside the frame rails.
It worked.

I'll be interested to learn if changing the knock sensors changes the results you're seeing in the monitor. AFAIK, those are not a maintenance item, but perhaps they should be.

 

[skpyle]

To be honest, I feel the same way. I replaced them as part of the troubleshooting, based upon the spiked readings I was getting.
I plan on monitoring knocks on my way to work tomorrow evening.
Also, might be based upon age, though my Escalade is only 9 years old.

 

[swathdiver]

To be honest, I feel the same way. I replaced them as part of the troubleshooting, based upon the spiked readings I was getting.
I plan on monitoring knocks on my way to work tomorrow evening.
Also, might be based upon age, though my Escalade is only 9 years old.

Could those spikes be related to Torque Management?

 

[skpyle]

I don't know. The spikes were random, and the vehicle speed was relatively constant, as was perceived engine load (by me).

 

[skpyle]

I monitored knocks on cylinders 2, 4, and 5 on the way to work yesterday evening. I still saw some spikes, but I realized I was looking at them on a scale of 1 to 0. Meaning yes or no. Not magnitude of the knock. I switched to Live Plot of total knock retard. That was quieter. Though, I saw a few 5 degree knock retard events. Sometimes at steady state cruising. Accelerating brought the occasional 1 degree knock retard.
To be honest, I don't really understand what I am looking at.
On that note, do LS engines have minor knock as they run? Is what I am seeing normal?

This morning, I will be monitoring the OCTSL_M factor value on the EFILive AutoCal V3 on the drive home. We will see if it looks any better.

I am considering loading the stock tune back in the engine and looking at the same data on both the Tech 2 and the AutoCal V3.

 

[petethepug]

Nice approach on identifying what the norm may end up being and using real data for the root cause. I’ve always wondered what a new factory motor would show and if this is the norm.

 

[skpyle]

Nice approach on identifying what the norm may end up being and using real data for the root cause. I’ve always wondered what a new factory motor would show and if this is the norm.

Thanks!

To be honest, I am making this up as I go.

In the Navy, I was taught to troubleshoot equipment down in the engine rooms. I am now paid to do the same thing in a heavy stamping facility.

I approach my vehicles in the same way. Try to develop a logical plan, observe all data, use any and all resources available to me, and try to make sense of what I am seeing.


This morning, I monitored the OCTSL_M factor value on my drive home from work. It started at 0.191 in the parking lot, then dropped to 0.00 as I drove on surface streets.
Once I hit the highway, the value started to rise, then cycled up and down. All changes were gradual, no spikes.
Max I saw on the highway was 0.101, with 0.00 as minimum. Avg was 0.048 - 0.055.

I could not really see a pattern to the rise and fall of the value. It would go up during steady state. It would go down during accelerating. It would go up when accelerating. It would go down when steady state.

I refueled with 25.5 gallons of 93 Octane ethanol gasoline at my local QT just before I got to work last night.
I will drive a couple more days, then monitor the OCTSL_M factor value again.
See how it is on 93 octane again.

 

[petethepug]

In that case, I can want a ride in the 928S or at least a few pics. I’ll put money that car is dialed in and overbuilt on all of its known Achilles heels like a spit polished engine room.

 

[skpyle]

In that case, I can want a ride in the 928S or at least a few pics. I’ll put money that car is dialed in and overbuilt on all of its known Achilles heels like a spit polished engine room.

It is not...yet. But it will be.

 

[skpyle]

I ended up driving longer, and have refueled again. 25 gallons of 93 octane ethanol gasoline from my local QT a couple of days ago.
Tonight, on my way to work, I again monitored the OCTSL_M factor value.
It started at 0.968 in the driveway, but quickly dropped to 0.552 once on the highway. The value steadily crept down to 0.249, then wavered between it and 0.300. Once I hit surface streets, the value dropped to 0.202, then 0.149 once I got to work.

So, it seems to be a little better. Though, looking back, it seems similar to what I saw with the Lucas octane booster.

 

[skpyle]

Well…she is all my problem now.
24 month/24,000 mile powertrain warranty has now expired.

 

[Geotrash]

View attachment 401611

Well…she is all my problem now.
24 month/24,000 mile powertrain warranty has now expired.

Sheesh… not even broken in yet!

 

[j91z28d1]

I just read thru all 16 pages.. what a ride.

man, I wish you'd post up all the used parts you took off forsale. they are probably in better shape than the new parts we are buying at auto parts stores lol.


the tune is interesting. instead of searching for better fuel can you just ask them to pull a deg of timing out of steady state cruise area of the map? that's what I did to my ls3. is basically your engine without the cam timing controls a different stock cam in a lighter manual car, but even so I pulled 1 deg out of the entire stock spark map besides idle and decel area. I didn't log knock as well as you, but I saw some noise and engine just felt raspy for lack of a better word under acceleration. so after removing a deg it feels smoother thru the whole Rev range. I have a feeling in a heavier truck with a auto that's always trying to keep rpms low on the interstate they are just asking to much of our weak 93 these days.

have you done anything to alter the intake filter and box setup? you may log maf hz and graph them for sport. I found anything besides a completely stock airbox and oem filter, the maf signal got *noisy* for lack of a better term again, on the interstate speeds, just slightly reduced throttle in that odd area where that throttle isn't closed enough to get into decel engine braking but less than steady state cruise amount. being a manual it caused a slight bucking and drive line slack the ecm didn't like at all. I couldn't find a way to tune around it that I was happy with, tried 2 different air intake systems, a k&n and a corsa. both were bad, eventually I gave up and bought a used oem box and all was perfect signal wise again.

now this was not one of our trucks, as i have a totally different from yours 6.0L in that with Cathedral Port heads that lives on 87 but a manual car, the auto in these trucks might hide any of that feeling while driving, except from a log you're seeing. but I mention it only because you seem very detailed in your troubleshooting and logging data.


very nice caddy. I wish I had have your motivation to fix my yukon up but the expense and lack of quality parts over the years has led me to more of the if it ain't broke, don't fix it till it is broke mindset with preventive maintenance.

 

[petethepug]

928 pics yet?

 

[skpyle]

Sheesh… not even broken in yet!

Nope. My goal is 300,000+ miles.

 

[skpyle]

928 pics yet?

'fraid not. She is still languishing. I am currently stuck on fabricating new cunifer brake lines from the ABS pump around the engine bay to the calipers. My Bend-Fu leaves a little to be desired.

 

[skpyle]

I just read thru all 16 pages.. what a ride.

man, I wish you'd post up all the used parts you took off forsale. they are probably in better shape than the new parts we are buying at auto parts stores lol.


the tune is interesting. instead of searching for better fuel can you just ask them to pull a deg of timing out of steady state cruise area of the map? that's what I did to my ls3. is basically your engine without the cam timing controls a different stock cam in a lighter manual car, but even so I pulled 1 deg out of the entire stock spark map besides idle and decel area. I didn't log knock as well as you, but I saw some noise and engine just felt raspy for lack of a better word under acceleration. so after removing a deg it feels smoother thru the whole Rev range. I have a feeling in a heavier truck with a auto that's always trying to keep rpms low on the interstate they are just asking to much of our weak 93 these days.

have you done anything to alter the intake filter and box setup? you may log maf hz and graph them for sport. I found anything besides a completely stock airbox and oem filter, the maf signal got *noisy* for lack of a better term again, on the interstate speeds, just slightly reduced throttle in that odd area where that throttle isn't closed enough to get into decel engine braking but less than steady state cruise amount. being a manual it caused a slight bucking and drive line slack the ecm didn't like at all. I couldn't find a way to tune around it that I was happy with, tried 2 different air intake systems, a k&n and a corsa. both were bad, eventually I gave up and bought a used oem box and all was perfect signal wise again.

now this was not one of our trucks, as i have a totally different from yours 6.0L in that with Cathedral Port heads that lives on 87 but a manual car, the auto in these trucks might hide any of that feeling while driving, except from a log you're seeing. but I mention it only because you seem very detailed in your troubleshooting and logging data.


very nice caddy. I wish I had have your motivation to fix my yukon up but the expense and lack of quality parts over the years has led me to more of the if it ain't broke, don't fix it till it is broke mindset with preventive maintenance.

Thank you for the insight! I grew up with and cut my teeth on rusty 1970's GM junk. Don't get me wrong, I loved them. But, I appreciate nicer things now.
The intake tract is all stock, other than a new WIX air filter every year. The MAF is stock, and has been cleaned. I will likely replace it with OEM in the forseeable future.
Good point about pulling a degree of timing in steady-state cruise. I will contact Black Bear.

Thanks!