Fuel Trims - Page 2

Jfmoore79 · 03-23-2019, 04:29 PM

I verified that the bypass valve was working properly with no leaks in the diaphragm. I then removed the catch can from the system and hooked up the vacuum log to the PCV system per the Procharger installation manual. Logged the car again and the fuel trims were still off. The STFT were primarily negative but did not fit in the -1 to -3 range. LTFT were still high. I am going to order a leak detector but wondered if it would be worthwhile to pull the intake manifold and see if the gaskets were pushed out or if I can find any cracks in the intake itself? Gaskets would be an easy and cheaper fix. Even an intake isn’t outrageous.

I am a pretty good shade tree guy who can replace parts and do some modifications but a trained troubleshooter I am not. Strongly considering shipping the car to an expert so maybe I can enjoy the car this season.

JANNETTYRACING · 03-25-2019, 08:30 AM

Quote:

Originally Posted by Jfmoore79

I verified that the bypass valve was working properly with no leaks in the diaphragm. I then removed the catch can from the system and hooked up the vacuum log to the PCV system per the Procharger installation manual. Logged the car again and the fuel trims were still off. The STFT were primarily negative but did not fit in the -1 to -3 range. LTFT were still high. I am going to order a leak detector but wondered if it would be worthwhile to pull the intake manifold and see if the gaskets were pushed out or if I can find any cracks in the intake itself? Gaskets would be an easy and cheaper fix. Even an intake isn’t outrageous.

I am a pretty good shade tree guy who can replace parts and do some modifications but a trained troubleshooter I am not. Strongly considering shipping the car to an expert so maybe I can enjoy the car this season.

Than you fixed something Last logs I seen where adding fuel Positive 10-15 percent.

We are really close to finishing up don't give up yet.

Ted.

Jfmoore79 · 03-25-2019, 09:43 AM

I will send you latest log when I get home. I pulled the intake to be sure I hadnt pinched a gasket but they look good. Ive been strongly considering getting in line at your shop and shipping the car for the fix and a dyno tune.

KingLT1 · 03-25-2019, 09:35 PM

You might try resetting the LTFT via VCM tools in the scan software.

Jfmoore79 · 03-25-2019, 09:54 PM

Quote:

Originally Posted by KingLT1

You might try resetting the LTFT via VCM tools in the scan software.

I typically reset the LTFT and Comps after making any changes but thanks for the reminder. I removed the intake but didnt see anything that raised any questions. I did find one of the crankcase vent lines that feeds the factory separator was completely loose and coming off the port. I will finish hooking everything back up tomorrow and see what the numbers look like. Fingers crossed

mrgoodbytes · 05-24-2019, 09:23 AM

Quote:

Originally Posted by Jfmoore79

I typically reset the LTFT and Comps after making any changes but thanks for the reminder. I removed the intake but didnt see anything that raised any questions. I did find one of the crankcase vent lines that feeds the factory separator was completely loose and coming off the port. I will finish hooking everything back up tomorrow and see what the numbers look like. Fingers crossed

Hi Jfmoore79, did connecting the PCV line change anything?

Jfmoore79 · 05-24-2019, 01:07 PM

Quote:

Originally Posted by mrgoodbytes

Hi Jfmoore79, did connecting the PCV line change anything?

Yes after getting that vacuum line secured, as well as double and triple checking all the others, the trims were back in a normal range. Ted at JRE finished up the tune and the car is running great.

JANNETTYRACING · 05-25-2019, 07:28 AM

Quote:

Originally Posted by Jfmoore79

Yes after getting that vacuum line secured, as well as double and triple checking all the others, the trims were back in a normal range. Ted at JRE finished up the tune and the car is running great.

pavetim · 07-24-2020, 07:57 AM

Is this a concern on NA cars? I logged my first day today in my 17 SS and ill have to double check but could have sworn i see higher and lower trims than the -1 to 3%. If its off would you suggest taking it in to dealer and try to explain lol? Can you reset the trims? My car still ynder manufacturer warranty

03-23-2019, 04:29 PM	#15
Jfmoore79 Drives: 2016 Garnet Red 2SS A8 Join Date: Jul 2017 Location: Bowling Green, Ky Posts: 124	I verified that the bypass valve was working properly with no leaks in the diaphragm. I then removed the catch can from the system and hooked up the vacuum log to the PCV system per the Procharger installation manual. Logged the car again and the fuel trims were still off. The STFT were primarily negative but did not fit in the -1 to -3 range. LTFT were still high. I am going to order a leak detector but wondered if it would be worthwhile to pull the intake manifold and see if the gaskets were pushed out or if I can find any cracks in the intake itself? Gaskets would be an easy and cheaper fix. Even an intake isn’t outrageous. I am a pretty good shade tree guy who can replace parts and do some modifications but a trained troubleshooter I am not. Strongly considering shipping the car to an expert so maybe I can enjoy the car this season. __________________ 2016 Camaro 2SS - Auto - MRR 017 - Garnet Red P1X w/ Stage II IC, LT4 Fuel System, JMS Voltage Booster, MMS Catch Can, JRE Off Road Pipes, JRE Tune

03-25-2019, 09:43 AM	#17
Jfmoore79 Drives: 2016 Garnet Red 2SS A8 Join Date: Jul 2017 Location: Bowling Green, Ky Posts: 124	I will send you latest log when I get home. I pulled the intake to be sure I hadnt pinched a gasket but they look good. Ive been strongly considering getting in line at your shop and shipping the car for the fix and a dyno tune. __________________ 2016 Camaro 2SS - Auto - MRR 017 - Garnet Red P1X w/ Stage II IC, LT4 Fuel System, JMS Voltage Booster, MMS Catch Can, JRE Off Road Pipes, JRE Tune

03-25-2019, 09:35 PM	#18
KingLT1 Drives: 2016 1SS NFG A8 Join Date: Aug 2017 Location: 46804 Posts: 6,789	You might try resetting the LTFT via VCM tools in the scan software. __________________ 2016 NFG 1SS A8 Options-2SS Leather/NPP Perf. mods-Whipple 2.9/Fuel System/Flex Fuel/103mm TB/Rotofab Big Gulp/Cat Deletes/Corsa NPP Per. times- 10.5 @ 137 w/ 1.8 60ft Full weight on 20's 1200DA

07-24-2020, 07:57 AM	#23
pavetim Drives: firebird Join Date: Jan 2010 Location: valdosta, georgia Posts: 155	Is this a concern on NA cars? I logged my first day today in my 17 SS and ill have to double check but could have sworn i see higher and lower trims than the -1 to 3%. If its off would you suggest taking it in to dealer and try to explain lol? Can you reset the trims? My car still ynder manufacturer warranty

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