s13vette

iTrader: (1)

Ok.. look i guess noone is reading my original post...

The car has been running fine with its tune for well over a year. Its just now that it started random.

Update on the situation I changed the O2 sensor on bank 1. it seems a little better. But not enough.

s13vette

iTrader: (1)

Can someone please explain the COT better... if u dont mind please.

gagliano7

COT dumps fuel to cool the cats.If you don't have cats you want COT turned off.

s13vette

iTrader: (1)

thank you gagliano7...

Update i just looked over my tune and COT is turned off

ddnspider

iTrader: (26)

Not sure if you already did or not, but post the tune if you really want someone to dig through it for you. Or do it on HP Tuners forum. I would take a look but I only have EFI Live.

If it's all of a sudden dumping fuel, either you have an O2 issue, or weak spark, or maybe a sticking injector issue. All of which you should be able to log the necessary PID's to monitor.

s13vette

iTrader: (1)

here is a copy of my tune thanks for everyone helping out.

ddnspider

iTrader: (26)

I downloaded HP Tuners to take a look at your tune.

Your Power Enrichment table is set to 1.229 across the RPM range.....that's where your 11.X:1 A/F is coming from. I see its a nitrous tune by the name of the file so that explains why youre commanding that A/F.

You also have PE delayed below 3200rpm's which may explain why you weren't seeing this all the time.

COT is disabled in the tune.

ddnspider

iTrader: (26)

Also, what are the mods? Is it basically stock? Your MAF lb/min is lower than I would expect even for a basically stock setup unless you're at higher altitude.

s13vette

iTrader: (1)

I have a 99 LS1 with the mods explained
LS6 manifold, Ported Throttle body 85mm, 4 inch cold air intake, and 3 inch exhaust on a built 4l60e

If u can fix what u think is wrong it will be great man...

Thanks for the help big time.
If u can or wanna contact me ill pm u my phone number no homo lol

ddnspider

iTrader: (26)

Sorry man, I don't actually own HP Tuners. I have EFI Live V2, which I actually prefer after comparing the 2 lol. I just downloaded HP Tuners to try and help take a look at your tune. Do you own HP Tuners? I could walk you through some of the changes. I'm also assuming you don't actually have nitrous on the car?

s13vette

iTrader: (1)

I do have HP Tuner Pro, and I also have nitrous lol...
The car use to run AMAZING 12.9 all motor and when i sprayed it it will be 11.5-6 afr.


Again the car use to run perfect for over a year and a-half, I had the car down for a month while building the trans again and when i got it running is when it started.
No problem man give me a little bit and call if u can. I have to install it in my other laptop.

s13vette

iTrader: (1)

So thanks a million to ddnspider the man helped me out step by step...

I saw the PE tables way off. He helped on explaining what this does sense im new to HP tuners.

I got in my car and did some pulls around the neighborhood sense i live right off the highway . And here is the difference on the tune and here is the log of the last corrected pull.

Air and FUEL is now at 12.9-13.0 all across the board over 2000rpms.... well so far so good.


If you see anything I MEAN ANYTHING please do tell and also i disabled abuse mode for the transmission. If u see my trans tune and see something please tell me i wont be mad at all. After all I'am learning HP tuners

sho-me speed

iTrader: (55)

That is what I was referring to when i said your PE tables were raped and that is why it was commanding the 11:x AF Ratio.

Glad to hear you got it coming around.

s13vette

iTrader: (1)

yeah man its amazing... but i still want to get rid of my LTFT... if you can please look at the tune/log im having 8.2% fuel added across the board.

If u could guide me towards where to change it or disable it.

James@ShorTuning

I don't know that I would rev a stock LS1 with stock camshaft and valvetrain to 6500 either.... Most all the stock cam LS1's I've dealt with peak ~56-5700rpm.

You said the issue happened overnight... kinda leads me to believe you have a broken valvespring so it may be a good idea to pull the valve covers to at least inspect to make sure everything is okay. 6500rpm is hard on the little stock beehives.

EDIT*** I didn't even see the second page of comments haha. Sounds like your on the right track. I normally disable LTFT all together so they cannot have any adverse affect on WOT fueling. Normally if the LTFT learns + corrections they will transfer to WOT fueling. If they learn - corrections they will never pull fuel from WOT and will 0 out. When you disable them all together they never learn. The best practice is to disable them and then use STFT or full time open loop with a quality wideband to dial in your VE and MAF then you can verify partial throttle fuel trims and your WOT fueling will be purely open loop actual = commanded.

s13vette

iTrader: (1)

K guys sorry to being this back up but I the same problem again.

So I put the car on the dyno. And as I got to 4500rpm/5500 rpms dramatic power loss even doe a/f stayed the same. I added some timing on does spots and dramatically fixe the issue. Granted I have short term and long term both disabled.

Will post up picture of the before and after dyno pull. So now the car is back at it again doing the same ****.... It's really agrevating the hell out of me

s13vette

iTrader: (1)

Here is a picture of the dyno pull
Notice as the air and fuel ratio is perfect between 12.80-13.00


Blue is before i added timing to the map.
Red is after i added timing.

Now i was considering the fact that my exhaust is pretty kinked when the drive shaft snapped on me.

Does anyone think this could be a flow restriction problems?

and when i do a damn log i get 15%+ fuel on the LTFT even though its not enabled

ddnspider

iTrader: (26)

Have you popped the valve covers?....

s13vette

iTrader: (1)

Yes and all seems clear

ddnspider

iTrader: (26)

Looks like a stock cam, stock springs too? If so you should NOT be revving it that high. Have you logged to see what the A/F is and actual timing when the graph goes all haywire?