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Author Topic: Help with loss of power  (Read 1197 times)

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Offline KappaSky

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Re: Help with loss of power
« Reply #25 on: January 19, 2021, 04:33:14 PM »
Steelmesh, thanks for your thoughts.
Considered that, brand new plugs. Pull them and adjusted the gaps. Opened them up to see if it would affect it any. Unfortunately no with a tighter gap and a wider gap.

Offline Steelmesh

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Re: Help with loss of power
« Reply #26 on: January 20, 2021, 06:29:58 PM »
Doesn't the LNF come with a fuel rail pressure sensor and WB02 on the stock ECU?  Those would be helpful in continuing your diagnosis. 
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Offline elff

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Re: Help with loss of power
« Reply #27 on: January 20, 2021, 06:34:05 PM »
Yes they do and HPT can log it. 

Offline KappaSky

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Re: Help with loss of power
« Reply #28 on: January 20, 2021, 07:44:42 PM »
Far from scientific, but my Aeroforce gauges are capable of displaying fuel pressure at the rail and A/F. Unfortunately, impossible to drive, force the hiccup and monitor the gauges at the same time (even with a passenger) Being able to log would be beneficial.


Offline MattM

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Re: Help with loss of power
« Reply #29 on: January 22, 2021, 08:54:15 AM »
100 percent know your issue as I had it for years!  If you go to performance autowerks website (or other vendor)  and buy the upgraded GM Stage 2 map sensors. Then you will need a new Trifecta tune for those sensors. 
Like I said I had that problem since day 1.  Last year I bought upgraded to the Trifecta custom cataloguing tune (you should too because they will take the difference between the canned tune you already bought and the custom tune which is well worth it).  So I catalogued this error for a year with them and they told me that at wide open throttle around 5100 rpms the base timing would go from the commanded 12 degrees of advance to 6 and go back and forth until redline.  This would feel like a kind of stutter.  Anyway they surmised it was the stock map sensors.  I even got brand new stock map sensors first to test it first and it still did it.  Well, after I got the new sensors and they gave me the upgraded tune (for those sensors)  the problem was gone immediately.
Btw make sure they send you the upgraded GM Stage 2 sensor tune BEFORE you put the sensors in bc you don't want to drive it without the correct tune.

Offline KappaSky

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Re: Help with loss of power
« Reply #30 on: January 22, 2021, 09:19:18 AM »
@MattM, well this is optimistic.
In the spring I was going to start swapping a few parts. The first was the MAP sensor. Was going to pull one of my wife?s car (it doesn?t have these issues, but isn?t tuned).  If that failed, I was going to put the base tune back in to see if the hiccup still happened at full throttle. Noting that the boost pressure will be lower than with the tune.

Although this is very plausible, I wonder why it suddenly has manifested itself. The tune has been in for about 3 years now. The only change was a Solo HFC, which I swapped back to the factory cat. No changes. I am assuming the parameters of the base tune or any tune for that matter don?t change on the fly?

Anyhow, if the base tune runs fine, I will reflash with the trifecta tune and see what happens.

Thanks for the write up and info.

Offline MattM

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Re: Help with loss of power
« Reply #31 on: January 22, 2021, 04:50:20 PM »
I have the selectable tune.  I did exactly what you are thinking about doing...I switched to a brand stock map sensor etc...even on the base tune it still did it.  Don't know why but once it starts with stock map it will continue regardless.

This is more than "optimistic" btw...  So....here is how similar this is...I have a, guess what, 2007 sky redline that also had a trifecta tune and also had a solo hfc...  I changed plugs 5 times and gaps countless time.  Got a new high flow fuel pump as well.  Swapped MAP sensors as well...So then I get the datalogging trifecta tune and it took them a while to pinpoint the issue, but they eventually found the the advance fluctuation issue I told you about.  I questioned them on the stage 2 map and tmap as well they just said they knew of a few folks that this fixes the issue.  They even tried to command MORE advance to see if the fluctuation went away but even though it was commanding 13 degrees it couldn't hold it.

Now here's the really really crazy kicker!!!  So it WONT throw a code until the map sensor does fail, but when it does this problem will go away!  I'll have to search what code I eventually got with my first MAP sensor but when I got it my car ran like a lambo!  Thats when I got my 13.6 with a check engine light lol.

I wish I would have kept the first MAP sensor bc I could have sent to you so you would get the code and then you could see how well it runs (to know you need the stage 2 sensors).

Offline MattM

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Re: Help with loss of power
« Reply #32 on: January 22, 2021, 05:54:56 PM »
Found the code it was P0107.  Also found two threads about the same issue on sky roadster forum (one was mine)
here is Bun1t's thread.  He mentions it running better after the code as well. https://www.skyroadster.com/threads/aftermarket-tune-map-sensor-fail.29595/#post-408573

Here is mine:
https://www.skyroadster.com/threads/why-do-i-have-better-performance-after-map-sensor-failure.96253/#post-1305529

Offline KappaSky

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Re: Help with loss of power
« Reply #33 on: January 22, 2021, 06:45:14 PM »
Now that is crazy odd, because I have the selectable tune as well. Thinking if I put it back to the base tune it would produce less boost and maybe not throw the hiccup. Unfortunately that want the answer. This whole time I was thinking it was a sensor and was going to systematically start swapping parts from my wife?s car. Parts would have been ?free? for the testing.

So if the answer is a 3bar, I?m going to need to go back to Trifecta and order an upgraded tune.  Lucky I kept the red tuning cable.

Anyone on here have recent experience with Trifecta? 

I?ll have a read of the links Matt. Thanks for your help on this.

Offline KappaSky

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Re: Help with loss of power
« Reply #34 on: January 22, 2021, 07:33:57 PM »
@MattM. Good read, everything sound familiar except it sounds like your power loss was more like a pulse or fluctuation?  My power loss is sudden and total loss of power. 

Offline MattM

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Re: Help with loss of power
« Reply #35 on: January 22, 2021, 08:37:03 PM »
Now that is crazy odd, because I have the selectable tune as well. Thinking if I put it back to the base tune it would produce less boost and maybe not throw the hiccup. Unfortunately that want the answer. This whole time I was thinking it was a sensor and was going to systematically start swapping parts from my wife?s car. Parts would have been ?free? for the testing.

So if the answer is a 3bar, I?m going to need to go back to Trifecta and order an upgraded tune.  Lucky I kept the red tuning cable.

Anyone on here have recent experience with Trifecta? 

I?ll have a read of the links Matt. Thanks for your help on this.
Well when It happened I'd usually let off.  It definitely felt like I hit a wall when it happened.

Yeah, it wasnt that long ago when trifecta did the datalog tuning for me.  If you tell them when the power loss starts they'll be able to tell you if the issue is related to advance issues or something else.  Btw it is normal for the stocker MAP to go bad once its tuned as well. 

Offline KappaSky

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Re: Help with loss of power
« Reply #36 on: January 22, 2021, 10:19:16 PM »
Matt, I?ve sent Trifecta an email. Will let you know what happens.
Thanks

Offline Gentleman Jack

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Re: Help with loss of power
« Reply #37 on: January 25, 2021, 03:30:54 AM »
Promising news!!!  Well done.
Make the right choices now

Offline KappaSky

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Re: Help with loss of power
« Reply #38 on: January 25, 2021, 11:13:21 AM »
It's a good starting point Gentleman Jack.  Fingers crossed!

Offline MattM

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Re: Help with loss of power
« Reply #39 on: January 26, 2021, 09:11:55 AM »
Hey Kappasky...Other thing I wanted to ask was when you feel it lose power passed 5000 rpms do you immediately let off?  Reason I ask is bc that's what I used to do, but Trifecta wouldn't be able to see that in the datalog (it would just look like you let off to them).  If you keep your foot on the gas to try to make it go passed 5000tpms does it buck somewhat?  Like it alternates between losing power then moved smoothly then loses power again?

Offline KappaSky

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Re: Help with loss of power
« Reply #40 on: January 26, 2021, 07:09:53 PM »
Hey Matt. Nothing after it stumbles. Starts to buck and instinctively I let off as not to destroy it.

Update from Trifecta...they were awesome. They offered up to review one of my logs. I explained that the car is in storage, so they said just to send it when I get the car out.

Offline MattM

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Re: Help with loss of power
« Reply #41 on: January 26, 2021, 08:38:29 PM »
Hey Matt. Nothing after it stumbles. Starts to buck and instinctively I let off as not to destroy it.

Update from Trifecta...they were awesome. They offered up to review one of my logs. I explained that the car is in storage, so they said just to send it when I get the car out.
That is perfect that you don't have to pay yet to let them see the datalogs.  With regard to the bucking I bet if you kept your foot on the gas you would feel it let up then accelerate then let up again..  It almost feels like a misfire (which is why you lifted off the gas)

Offline KappaSky

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Re: Help with loss of power
« Reply #42 on: January 26, 2021, 09:32:34 PM »
Looking forward to hearing what Trifecta finds. Now to wait out the winter.

 

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