Hesitation and high KR Cold weather issues?

SHOnUup · April 05, 2015, 02:32:24 PM

^^^agreed

Simple change of trans fluid stopped my 1-2 shift stutter.

Rich

ShoBoat · April 05, 2015, 06:52:31 PM

So after a bit of time messing around in the garage, I am no closer to discovering the culprit. I have looked into the intake and CAC with my snake cam. Found noting really special in the intake, no real additional build up on the valves. And the CAC is bone dry. Cleaned the TB and sensors. I have gone over the logs and compared them to last year the only thing that stands out is the outside temp. Today it's a balmy -1C and like my friends to the South we also had some snow overnight. Since I also tossed in 10L of 110 race gas, I'm thinking it's not fuel related.
The shudder is registering as misfires (feels like it too) on Forscan and Torque. With the stock tune it's perfectly fine, no shudder and nearly 0 KR at all. At least the list is getting smaller.

Spark blowout? (Doesn't explain the KR) Also plugs are at 30.
I know that with the V7 LMS tune some were reporting similar issues. Maybe Tune? In combination with the cold? (Could possibly explain both)
Injector(s)?

I still plan on getting with the guys at LMS tomorrow and see what they have to say. I should be able to get my dealer to do the TSB for the trans.

SHOnUup I had my trans fluid changed last fall. But thanks anyway.

ShoBoat · April 05, 2015, 06:54:19 PM

Oh one other thing, what all the talk of blowing turbos with induction cleaning. Is anyone still doing this? I wanted to have this done (again) this spring but am on the fence.

SHOdded · April 05, 2015, 08:27:37 PM

No codes being set? I know you said Forscan/Torque are registering misfires. I would pay attention to a faulty injector possibility, maybe more than 1. How are the fuel pressure readings?

glock-coma · April 05, 2015, 09:06:57 PM

Quote from: ShoBoat on April 05, 2015, 06:54:19 PM
Oh one other thing, what all the talk of blowing turbos with induction cleaning. Is anyone still doing this? I wanted to have this done (again) this spring but am on the fence.

I don't think the BG service is really worth it. I had the service completed 6-6-14 @ 33,291 miles.
I just rechecked my intake valves and CAC today.
I'm now at 39,400....... So a little more than 6,000 miles and they still look like this......

2010 RCM non PP
K&N panel filter
sp534 @ 30
unleashed 93 performance+boost 3bar
more to come.....

ShoBoat · April 05, 2015, 10:58:37 PM

Fuel pressure looks normal, no codes just some misfires. Interesting on the BG service. How did the CAC look glock-coma?

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glock-coma · April 06, 2015, 11:38:49 AM

I'll take a pic later. I got about 3 oz out again. I really need to install the catch can I bought from SwampRat...lol

ShoBoat · April 07, 2015, 01:55:46 PM

So a small update, I swapped out the plugs again and no change. I then proceeded to re clean the 2 map sensors and I reset the learned behaviour through Forscan. (Reset trans and other adaptations). Weird it's not as bad as it was. Even KR seems to be lower than before. It's still there but not nearly as severe. More to come.

ZSHO · April 07, 2015, 02:16:02 PM

Quote from: ShoBoat on April 07, 2015, 01:55:46 PM
So a small update, I swapped out the plugs again and no change. I then proceeded to re clean the 2 map sensors and I reset the learned behaviour through Forscan. (Reset trans and other adaptations). Weird it's not as bad as it was. Even KR seems to be lower than before. It's still there but not nearly as severe. More to come.

As metioned a while back,cleaning those map sensors is crucial for optimum performance,did you try swapping both the 3-bar sensors around and monitor for any changed reading,maybe a new 3-bar map is in store.Z

SHOdded · April 07, 2015, 02:17:37 PM

Still in the learning phase, then? Let's wait a bit and hope it resolves ...

ShoBoat · April 07, 2015, 03:05:04 PM

Quote from: ZSHO on April 07, 2015, 02:16:02 PM
Quote from: ShoBoat on April 07, 2015, 01:55:46 PM
So a small update, I swapped out the plugs again and no change. I then proceeded to re clean the 2 map sensors and I reset the learned behaviour through Forscan. (Reset trans and other adaptations). Weird it's not as bad as it was. Even KR seems to be lower than before. It's still there but not nearly as severe. More to come.
As metioned a while back,cleaning those map sensors is crucial for optimum performance,did you try swapping both the 3-bar sensors around and monitor for any changed reading,maybe a new 3-bar map is in store.Z

I have swapped around the sensors, did make any difference at the time. Going to replace the plug boots tonight and clean all the IC piping. See what that does.

Always learning SHOdded

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AJP turbo · April 07, 2015, 08:35:11 PM

Damn lol your posts make me tired with all the plug swapping and hardware cleaning and what not that you do lol...Your anal!

Just reading through, you said when you returned to stock the retard went away...Well that tells me tune not hardware that you have been investigating, maybe certain areas in your tune are slightly over advanced and LME is just relying on the knock sensors to do their job? Not a terrible thing as long as it not pulling crazy amounts of timing all the time.

And you got me thinking, are you logging with Live link? I always log "knock sensor" and when I see a value of 2 it's adding 2 degrees there. So I wonder if you are interpreting the PID reading wrong. When you see the PID called Knock sensor retard and see +4.5 are you just assuming that it's pulling 4.5 degrees? Because if I saw -4.5 I would assume that means it's pulling timing but if you saw that you would assume it's adding 4.5 degrees.

I didn't think you are logging with live link so it just makes me wonder if your logging app calls the PID that reads the knock sensor "knock sensor retard" the same that Live link calls "knock sensor" in which case a positive number means it's adding timing.

If you are looking for the value to be 0 all the time you may never be happy. It's kinda like why there are 02 sensors....You will never have short term fuel trims at 0. They are constantly making small adjustments to compensate for component wear, failed parts and poor tuning etc... as long at the knock retard isn't going crazy all the time it might not be so terrible for the sensor to give readings hear and there...BUT over 4 degrees is getting a little on the high side one way or the other...Worst case your timing is over advanced and you are relying on the sensor to pull timing and best case you are retarded and making less power momentarily until the knock sensor decides it's safe to add a little more.

FoMoCoSHO · April 07, 2015, 08:43:53 PM

Shoboat, if you dumped a tank of 87 on your stock tune, you would probably have a stroke due to the amount of +KR activity, LOL!

BiGMaC · April 08, 2015, 12:36:34 AM

Quote from: FoMoCoSHO on April 07, 2015, 08:43:53 PM
Shoboat, if you dumped a tank of 87 on your stock tune, you would probably have a stroke due to the amount of +KR activity, LOL!

May be a thing to consider not withstanding everything else... What brand of gas are you using... In AZ the octane rating can be as much as 2 points below posted signage.... Low octane will up your KR real quick with s performance tune.

ZSHO · April 08, 2015, 08:23:02 AM

I know SHOBOAT has a 13 SHO with more than average mileage,anything over 60k on it due expect to change a part or two,due to normal wear and tear which could be validated,recall a while back when they had issues with the 13+SHO because the encoding/programming was different and they had to adjust the tune which closes the throttle blade at various points and open it much slower to keep from having the hesitation issue which later with the V8 Tune was fully rectified.