Z06 Reduced Power P1101 P0101

[SLEEPYDUB]

Trying to wrap my head around the next approach to resolving this issue. Tune file attached.
Pulled Tune from Colorado.hpt

Don't really know much about the car. Owner bought it in Colorado (we are at sea level) and is not savvy with cars, just wants to drive it and enjoy it. Has a Whipple on it, and a Halltech CAI, and Meth Injection, runs around 15-17psi, 93 octane.

When it was first brought in, it ran like crap and on the dyno it only made 450whp. We figured it was a mechanical issue so we did the normal diag. Found the air filter was laying the box. Fixed that problem, then it made 550whp. Great, still low and eventually continued to throw the P1101 and P0101. Found that it had a bad hesitation after 5500rpm that felt like spark blowout. We decided to change the plugs with one step colder NGK and gap them down a bit. That seemed to clear up the misfire and now were able to make full pulls and about 600whp. Still low for the mods. We notice on the dyno after 5500rpm it drops off severely. On our logs we see the MAF maxing around 86lb and ~10,500hz. AFR looks great, 11.80 till around redline where it starts to drop into low 11s, maybe even high 10s. We assume this may be due to the meth injection. We tried to get it to go into reduced power mode again, and even after several pulls it never went into that mode, but still had the P1101 code popping up. Then when just driving normal after a few key cycles, it randomly went into reduced power mode and threw both codes again. Clear code, drive normally, comes right back on. Let is sit over night with code cleared, runs great for a long time till it eventually goes back into that mode.

We did notice the meth nozzle installation on the silicon coupler has sealant around it, like jb weld. So we are going to fix that first and try again, but I would like to have the tune looked over and see if there are any changes that should be made? Overall the car runs well, and he is happy with the power, we just need to get this reduced power to go away.

Thanks all

[TriPinTaZ]

Wow that tune is terrible. I'd be pissed if I paid for a tune like that. The P0101 and P1101 codes look to be perhaps the airflow correlation test wasn't correctly disabled in the tune. At least the P0101 is definitely that. The P1101 is related but could be other parts of the tune or a dirty MAF or issues with the intake tract.

I'd get another tuner and have it redone properly.

[SLEEPYDUB]

Wow that tune is terrible. I'd be pissed if I paid for a tune like that. The P0101 and P1101 codes look to be perhaps the airflow correlation test wasn't correctly disabled in the tune. At least the P0101 is definitely that. The P1101 is related but could be other parts of the tune or a dirty MAF or issues with the intake tract.

I'd get another tuner and have it redone properly.

This tune is exactly how it came from the tuner in Colorado, we have not made any adjustments yet because we've had obvious mechanical issues. Can you elaborate for me what you found in the tune that is so bad so that I can better understand? Could you tell me where to correct the airflow correlation test? I see it's disabled in engine Diag by setting it to 8800rpm. Where else needs to be adjusted?

We do suspect a leak after the MAF, which we will verify here in a few hours with a very special tool GM uses to pressurize the entire engine and fill with smoke. Makes it very easy to Diag leaks.

Thanks Taz

[TriPinTaZ]

This tune is exactly how it came from the tuner in Colorado, we have not made any adjustments yet because we've had obvious mechanical issues. Can you elaborate for me what you found in the tune that is so bad so that I can better understand? Could you tell me where to correct the airflow correlation test? I see it's disabled in engine Diag by setting it to 8800rpm. Where else needs to be adjusted?

We do suspect a leak after the MAF, which we will verify here in a few hours with a very special tool GM uses to pressurize the entire engine and fill with smoke. Makes it very easy to Diag leaks.

Thanks Taz

The whole tune strategy is terrible. One look at your spark tables and you will see why. There is a section in the tune that is specifically labeled P0101 test. The tuner only changed one of the temp ranges. You need to change both to avoid the P0101 test.

[HeavyChevy305]

Definitely start from scratch with that one

[SLEEPYDUB]

The whole tune strategy is terrible. One look at your spark tables and you will see why. There is a section in the tune that is specifically labeled P0101 test. The tuner only changed one of the temp ranges. You need to change both to avoid the P0101 test.

I see. I feel like I am having to pluck this information from you so forgive me. I do see that the Min ECT is 264 as well as the Max. Which one needs to be changed and should it be higher? I would assume the Min needs to be maxed out to 493, and the Max needs to be -40?

On a side note, we found leaks under the blower (suspect injector o-ring), and directly at the MAF sensor where there are cracks in the tube where the maf bolts into. Also a small one on the coupler on the TB. Owner does not want to fix...

Thanks. Hate to say it, but the owner is just trying to get the reduced power to stop...against our better judgement of fixing it right and completely redoing the tune, but this is what he wants and they pay the bills

[TheMechanic]

I see. I feel like I am having to pluck this information from you so forgive me. I do see that the Min ECT is 264 as well as the Max. Which one needs to be changed and should it be higher? I would assume the Min needs to be maxed out to 493, and the Max needs to be -40?

On a side note, we found leaks under the blower (suspect injector o-ring), and directly at the MAF sensor where there are cracks in the tube where the maf bolts into. Also a small one on the coupler on the TB. Owner does not want to fix...

Thanks. Hate to say it, but the owner is just trying to get the reduced power to stop...against our better judgement of fixing it right and completely redoing the tune, but this is what he wants and they pay the bills

At that exact moment I would be charging straight time. Those obvious problems that you found will degrade drive ability significantly. Maybe even to the demise of the engine. Who knows. That is the kind of customer that you need to do massive documentation and signed work orders on.

[SultanHassanMasTuning]

Pulled Tune from Colorado test.hpt

who ever tuned it was just crazy

i dont want a fellow z06 lt4 getting hurt

test attached you will need to log your afr and the rest of the prarmeters for DI

[SLEEPYDUB]

Pulled Tune from Colorado test.hpt

who ever tuned it was just crazy

i dont want a fellow z06 lt4 getting hurt

test attached you will need to log your afr and the rest of the prarmeters for DI

Thank you. Will test and post the log. Which specific parameters do I need to log for DI?

[doc350]

Hate to say it, but the owner is just trying to get the reduced power to stop...against our better judgement of fixing it right and completely redoing the tune, but this is what he wants and they pay the bills

I don't want to tell you how to run your business, but as a fellow shop owner, these customers aren't what pay the bills. They are the headaches that you end up spending way too much time on in order to make any money. And then, when something goes wring with the car, you get all the blame. If he doesn't want to fix the car, send him down the road and save yourself a headache.

Sorry for the rant.

[SLEEPYDUB]

I don't want to tell you how to run your business, but as a fellow shop owner, these customers aren't what pay the bills. They are the headaches that you end up spending way too much time on in order to make any money. And then, when something goes wring with the car, you get all the blame. If he doesn't want to fix the car, send him down the road and save yourself a headache.

Sorry for the rant.

Valid, and appreciated. That may be what we end up doing. I'm at least going to give what Sultan has sent me a try, and log it and see how it does since its a simple step for us.

[TriPinTaZ]

I see. I feel like I am having to pluck this information from you so forgive me. I do see that the Min ECT is 264 as well as the Max. Which one needs to be changed and should it be higher? I would assume the Min needs to be maxed out to 493, and the Max needs to be -40?

On a side note, we found leaks under the blower (suspect injector o-ring), and directly at the MAF sensor where there are cracks in the tube where the maf bolts into. Also a small one on the coupler on the TB. Owner does not want to fix...

Thanks. Hate to say it, but the owner is just trying to get the reduced power to stop...against our better judgement of fixing it right and completely redoing the tune, but this is what he wants and they pay the bills

You need to send that "customer" down the road. You've told him what his problems are and if he doesn't want to fix it then if I were in your shoes I would tell them sorry you don't do crappy work. When it leaves your shop and blows up the customer will undoubtedly blame you and bad mouth your shop. And having to pluck information from me isn't my goal. I'm basically saying there are too many things wrong with that tune for a forum post to correct. If you're a shop and are unable to tune a Gen V then you need to hire one of the guys such as Sultan to tune it properly.

But since you specifically asked, the P0101 Max engine temp should be set to like -32 or something it will never see. The tune is saying now Above or Below 264 degrees the test will not run. Human logic would think OK so it will only run if its 264 degrees. But the ECU is interpreting that as run below 264 degrees because it is most likely a range value in the code and it interprets the range to not run is 264 or higher.

[SLEEPYDUB]

Sent customer away with clear instructions to have the leaks fixed first, then we can continue. Figured out the max and min shortly after posting that. Sultans corrected maf curve and timing definitely helped and looks to be safe for now. I would like to know what all else looked so bad for my own education. The original tuner in Colorado said there is nothing wrong with his tunes, but clearly there is. Consulting Sultan for some remote tuning sessions sounds like something we should definitely consider for our future. Thanks all