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03-27-2025, 06:14 AM
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#1 |
 Drives: 1999 Z28, 2011 2SS VERT, 2016 1SS Join Date: Mar 2018
Location: Denton N.C.
Posts: 51
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P228D code, fuel pressure too high
I was wondering if anyone else has ever had this problem. I had this code come up one time before. I was at the track last night and had my car go into reduced power mode because of this. I have a 38% fuel lobe and a Lt4 hpfp, I used a lash cap. Is there something that needs to be changed in the tune?
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2016 Camaro 1SS, A8, rebuilt engine with GPI forged drop ins, Cam Motion stage 2 Pd blower cam, C5R chain, LMR chain tensioner, Katech pump, MSD intake, 95mm tb, I ported my heads, speed engineering 1 7/8 long tubes hooked to the factory exhaust , Lt4 fuel system. 505 rwhp, 461.8 torque
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03-27-2025, 07:41 PM
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#2 |
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Drives: 1999 Z28, 2011 2SS VERT, 2016 1SS Join Date: Mar 2018
Location: Denton N.C.
Posts: 51
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After doing some looking on HP tuners forum I'm thinking I'm seeing fuel pressure spikes form the bigger cam lobe and Lt4 hpfp upgrade. ??
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2016 Camaro 1SS, A8, rebuilt engine with GPI forged drop ins, Cam Motion stage 2 Pd blower cam, C5R chain, LMR chain tensioner, Katech pump, MSD intake, 95mm tb, I ported my heads, speed engineering 1 7/8 long tubes hooked to the factory exhaust , Lt4 fuel system. 505 rwhp, 461.8 torque
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03-28-2025, 09:46 AM
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#3 |
  
Drives: 2018 HBM ZLE Join Date: Aug 2017
Location: In the garage
Posts: 891
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I had this issue a couple years ago. Believe it was a tune related issue and my tuner had to make adjustments to get it functioning correctly.
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Check out my youtube channel
https://www.youtube.com/@evans.educa...ocxUzC1ferqeg8 Full SPL suspension / Ported blower / NW 103mm / Rotofab BG / 2" Headers / Ported heads / Upgraded Valvetrain w/ DOD delete / Custom 38% Cam / C7.R Timing chain / Katech Oil pump / BMR motor mounts and chassis braces / Katech 174* Thermostat / Pierburg Supercharger coolant pump / PLM HX / JMS voltage booster / ATI Damper w/ 8.6 Lower / MM Mild catch can / ADM Resevoir / soon to come... Rebuilt Engine / XDI +30% injectors / PWR Oil cooler setup / GMS Hood bracket 760 Whp / 700 Wtq E50 |
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03-28-2025, 03:33 PM
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#4 |
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Drives: 1999 Z28, 2011 2SS VERT, 2016 1SS Join Date: Mar 2018
Location: Denton N.C.
Posts: 51
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Yes I'm pretty sure it is. Looks like there is some parameters that need to be adjusted for the bigger fuel lobe. I found some info on the HP tuners forum. Hard to find info on fuel pressure because every search comes up with low pressure. I'm still learning the Lt platform.
Thanks
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2016 Camaro 1SS, A8, rebuilt engine with GPI forged drop ins, Cam Motion stage 2 Pd blower cam, C5R chain, LMR chain tensioner, Katech pump, MSD intake, 95mm tb, I ported my heads, speed engineering 1 7/8 long tubes hooked to the factory exhaust , Lt4 fuel system. 505 rwhp, 461.8 torque
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03-30-2025, 09:58 AM
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#5 |
         
Drives: 2016 1SS NFG A8 Join Date: Aug 2017
Location: 46804
Posts: 7,665
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Your leading edge angle table scale needs multiplied by percentage of the fuel lobe. So if it's a 38% lobe, you need to click on the axis, highlight, and multiply by 1.38.
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 2016 NFG SS A8/Whipple 2.9/Fuel System/Flex Fuel |
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03-30-2025, 04:15 PM
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#6 |
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Drives: 1999 Z28, 2011 2SS VERT, 2016 1SS Join Date: Mar 2018
Location: Denton N.C.
Posts: 51
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Thanks King! That's what I was reading about. Still learning this Lt platform. I'm going to do that and put it back on the Dyno and check everything out soon.
Thanks for everyone's input. I did run 7.31 on my 20s the other night when it threw the code and went to reduced power. I didn't run anymore since I didn't have my laptop with me . I won't leave it at home again. Fastest I've been is 7.29 on my drag pack so wish I'd had those on.
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2016 Camaro 1SS, A8, rebuilt engine with GPI forged drop ins, Cam Motion stage 2 Pd blower cam, C5R chain, LMR chain tensioner, Katech pump, MSD intake, 95mm tb, I ported my heads, speed engineering 1 7/8 long tubes hooked to the factory exhaust , Lt4 fuel system. 505 rwhp, 461.8 torque
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06-06-2025, 09:19 PM
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#7 |
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Drives: 17 hyper blue 2SS M6 Join Date: Mar 2018
Location: NorCal
Posts: 759
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I had this exact issue pop up this past weekend at COTA, avoided it by short shifting and staying away from red line.
@zracer, Did a tune fix the issue? Were you able to log the fuel pressure prior to tuning and see the spikes? I have an appointment with my tuner in a month, hopefully it's a similar fix to what King stated and a simple fix. |
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06-07-2025, 08:30 AM
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#8 |
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Drives: 1999 Z28, 2011 2SS VERT, 2016 1SS Join Date: Mar 2018
Location: Denton N.C.
Posts: 51
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I have been too busy with other's cars,for now my car has been on the back burner. After the research I've done and then King confirming what I've read the tune changes will be the fix I'm certain. He's sharp on this Lt platform and I'm still learning. I will post an update when I get back to mine.
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2016 Camaro 1SS, A8, rebuilt engine with GPI forged drop ins, Cam Motion stage 2 Pd blower cam, C5R chain, LMR chain tensioner, Katech pump, MSD intake, 95mm tb, I ported my heads, speed engineering 1 7/8 long tubes hooked to the factory exhaust , Lt4 fuel system. 505 rwhp, 461.8 torque
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06-07-2025, 12:38 PM
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#9 |
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Drives: 17 hyper blue 2SS M6 Join Date: Mar 2018
Location: NorCal
Posts: 759
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Gotcha, my appointment is mid July, after reading up on it I do think it's tune related like you and King have said. We'll see soon.
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06-07-2025, 02:59 PM
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#10 |
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Drives: 1999 Z28, 2011 2SS VERT, 2016 1SS Join Date: Mar 2018
Location: Denton N.C.
Posts: 51
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I plan on putting mine back on the Dyno soon to make some changes along with those corrections.
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2016 Camaro 1SS, A8, rebuilt engine with GPI forged drop ins, Cam Motion stage 2 Pd blower cam, C5R chain, LMR chain tensioner, Katech pump, MSD intake, 95mm tb, I ported my heads, speed engineering 1 7/8 long tubes hooked to the factory exhaust , Lt4 fuel system. 505 rwhp, 461.8 torque
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