2019 SS CCM Low Side Fuel Pressure Erratic

Chrome383Z · 07-26-2022, 04:30 AM

Has anyone seen this and found a fix? In the process of tuning 93 will be moving on to E85 soon.

Low side fuel pressure either reads or it doesn’t. MPVI2 HP tuners. It’ll read sometimes and be spot on but 80% of the time it just reads zero. I talked to Ted who is tuning the car and he has seen it before, believes it is a HP Tuners PID issue.

Concerns me moving to E85 as that’s a leading indicator before high side drops. All I have reliably now is high side pressure.

It did the same thing when I was tuning for bolt ons with GPI a year ago, but fuel wasn’t a concern then.

I actually replaced the low side pressure sensor when I installed the LT4 pump with a new AC Delco unit. No difference. Which makes sense because if it wasn’t reading I’m sure I’d get a code. So I don’t believe it’s a sensor issue.

I’ve tried logging without the wideband in the middle (HP tuners directly in OBD2) and no difference.

I’m about to throw a sensor on after the flex fuel and try to data log that way, but would prob require HP Tuners Pro which I don’t have to bring additional analog or CAN inputs.

Anyone else seen this or have a resolution?

Chrome383Z · 07-26-2022, 05:02 AM

Well I may have fixed it. My firmware on the MPVI2 had an update and there was an update to the VCM suite. I bought the MPVI2 when it first came out. Hasn’t been updated since. Plugged in and with ign on seems to be reading fine. I’m sure I’ll have a tune update this morning I’ll data log later today and see if the issue is resolved. If so I’ll leave this here for folks that may have the same issue with older firmware. “crosses fingers”

laynlo15 · 07-26-2022, 07:30 AM

Good to hear

KingLT1 · 07-26-2022, 09:08 AM

I seen this on another 19 SS I was tuning the transmission on.

Kerry · 07-26-2022, 12:22 PM

Mine does the exact same thing. So I watch high fuel rail pressure. When it drops for sure out of fuel

KingLT1 · 07-27-2022, 08:43 AM

Quote:

Originally Posted by Kerry

Mine does the exact same thing. So I watch high fuel rail pressure. When it drops for sure out of fuel

The problem with that is you can be running out of high side and still have good low side pressure...and vice versa. So you ideally need to be able to log both.

Chrome383Z · 07-27-2022, 09:30 AM

Hopefully this firmware update fixes it. I had to run out of town for work so won’t get a chance to log until this weekend.

Chrome383Z · 07-29-2022, 10:15 AM

Didn’t fix it. Bummer. Got lucky and it decided to read through 1/2 a 2-5k pull. Looks good should be fine on E60.

I probably won’t go any higher then E60 until I can put in an external inline analog sensor so I can read it accurately.

So weird. Is it just 19s or do 20+ seem to have this problem as well?

07-26-2022, 04:30 AM	#1
Chrome383Z Drives: 2019 Camaro 2SS Join Date: Aug 2020 Location: McCordsville, Indiana Posts: 621	2019 SS CCM Low Side Fuel Pressure Erratic Has anyone seen this and found a fix? In the process of tuning 93 will be moving on to E85 soon. Low side fuel pressure either reads or it doesn’t. MPVI2 HP tuners. It’ll read sometimes and be spot on but 80% of the time it just reads zero. I talked to Ted who is tuning the car and he has seen it before, believes it is a HP Tuners PID issue. Concerns me moving to E85 as that’s a leading indicator before high side drops. All I have reliably now is high side pressure. It did the same thing when I was tuning for bolt ons with GPI a year ago, but fuel wasn’t a concern then. I actually replaced the low side pressure sensor when I installed the LT4 pump with a new AC Delco unit. No difference. Which makes sense because if it wasn’t reading I’m sure I’d get a code. So I don’t believe it’s a sensor issue. I’ve tried logging without the wideband in the middle (HP tuners directly in OBD2) and no difference. I’m about to throw a sensor on after the flex fuel and try to data log that way, but would prob require HP Tuners Pro which I don’t have to bring additional analog or CAN inputs. Anyone else seen this or have a resolution? __________________ 2019 Shock 2SS A10. 2650@10psi/LPE HPFP/XDI+30/LT4 LPFP+JMS/Soler 95mm/Rotofab, E65, CSP 2” Headers/GESI GenII Cats. MM Wild/GM SG3 suspension/1LE Brakes, Velgen VF5 Wheels/GY SC3. JRE Tuned. Last edited by Chrome383Z; 07-26-2022 at 04:40 AM.

07-26-2022, 05:02 AM	#2
Chrome383Z Drives: 2019 Camaro 2SS Join Date: Aug 2020 Location: McCordsville, Indiana Posts: 621	Well I may have fixed it. My firmware on the MPVI2 had an update and there was an update to the VCM suite. I bought the MPVI2 when it first came out. Hasn’t been updated since. Plugged in and with ign on seems to be reading fine. I’m sure I’ll have a tune update this morning I’ll data log later today and see if the issue is resolved. If so I’ll leave this here for folks that may have the same issue with older firmware. “crosses fingers” __________________ 2019 Shock 2SS A10. 2650@10psi/LPE HPFP/XDI+30/LT4 LPFP+JMS/Soler 95mm/Rotofab, E65, CSP 2” Headers/GESI GenII Cats. MM Wild/GM SG3 suspension/1LE Brakes, Velgen VF5 Wheels/GY SC3. JRE Tuned.

07-26-2022, 07:30 AM	#3
laynlo15 Drives: 2022 Lt1 A10 Join Date: Nov 2015 Location: clark, mo Posts: 8,860	Good to hear __________________ 2022 Lt1 6.2 A10, Maggie 2300, THPSI Port Inj/10 rib, Rotofab, E, Nickey, SCOL, Griptech, RC Bandits, Hoosiers/MT 9.80@142.96 1.44 60ft, 6.34@112 707/669 RWHP/TRQ. 16SS Maggie 2650 9.41@147 1.35 60ft, 5.99@119. 16 C7 A8 10.90@128 Bolt on stuff

07-26-2022, 09:08 AM	#4
KingLT1 Drives: 2016 1SS NFG A8 Join Date: Aug 2017 Location: 46804 Posts: 6,800	I seen this on another 19 SS I was tuning the transmission on. __________________ 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

07-27-2022, 09:30 AM	#7
Chrome383Z Drives: 2019 Camaro 2SS Join Date: Aug 2020 Location: McCordsville, Indiana Posts: 621	Hopefully this firmware update fixes it. I had to run out of town for work so won’t get a chance to log until this weekend. __________________ 2019 Shock 2SS A10. 2650@10psi/LPE HPFP/XDI+30/LT4 LPFP+JMS/Soler 95mm/Rotofab, E65, CSP 2” Headers/GESI GenII Cats. MM Wild/GM SG3 suspension/1LE Brakes, Velgen VF5 Wheels/GY SC3. JRE Tuned.

07-26-2022, 12:22 PM	#5
Kerry Drives: 2019 2SS Camaro Join Date: Apr 2012 Location: Al Posts: 828	Mine does the exact same thing. So I watch high fuel rail pressure. When it drops for sure out of fuel

07-29-2022, 10:15 AM	#8
Chrome383Z Drives: 2019 Camaro 2SS Join Date: Aug 2020 Location: McCordsville, Indiana Posts: 621	Didn’t fix it. Bummer. Got lucky and it decided to read through 1/2 a 2-5k pull. Looks good should be fine on E60. I probably won’t go any higher then E60 until I can put in an external inline analog sensor so I can read it accurately. So weird. Is it just 19s or do 20+ seem to have this problem as well? __________________ 2019 Shock 2SS A10. 2650@10psi/LPE HPFP/XDI+30/LT4 LPFP+JMS/Soler 95mm/Rotofab, E65, CSP 2” Headers/GESI GenII Cats. MM Wild/GM SG3 suspension/1LE Brakes, Velgen VF5 Wheels/GY SC3. JRE Tuned.

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