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08-29-2025, 08:48 PM
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#1 |
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Super Stock
Drives: Chevrolet Camaro ZL1 Join Date: May 2022
Location: Concordia
Posts: 1,004
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Nostrum fuel injectors, post install idle surge issues
Dealing with a strange issue here.
Replaced injectors recently with some Nostrum 25%+ units and am having a strange idle issue. Everything runs totally fine, for quite a while actually, with fuel control within 6% then suddenly out of nowhere the idle starts surging and fuel trims go out of whack sending me 13%+- rich and lean. I got a log showing what is happening but don't see anything outstandingly wrong given how well it runs at first, and everything follows appropriately with the surge. Anybody ever experience the same or willing to take a look at my issue and take a stab at what could be wrong? Thanks in advance.
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2017 Red Hot ZL1 A10 - Apex ARC-8's, 305/ 325 PS4's, DSX 9.06 12% lower, Griptec OE upper, NGK HR7 Ruthenium plugs, Nostrum 25+ injectors, XDI Goliath HPFP, Katech dual in tank LPFP, Katech oil pump, LME tensioner, DOD delete, LT1 big fuel cam, Jokerz ported blower, MPI lid, GMS hood extractor bracket, Granatelli SS plug wires, Cordes LTR reservoir, DMS T-stat housing, 186* LS3 T-stat, Borla X pipe, Black Widow Angry Housewife/ Corsa NPP mufflers, BMR engine mounts, Banks iDash, Lithium Battery, AEM X- Series, HP Tuners, E85, 16.5 psi
758 HP/ 804 TQ  |
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08-30-2025, 09:03 AM
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#2 |
           
Drives: 2016 1SS NFG A8 Join Date: Aug 2017
Location: 46804
Posts: 7,665
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Curious why did you go from XDI +30 to Nostrum +25?
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 2016 NFG SS A8/Whipple 2.9/Fuel System/Flex Fuel |
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08-30-2025, 12:18 PM
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Moderator
Drives: 2017 Camaro 2SS A8 Join Date: Aug 2018
Location: New Ipswich NH
Posts: 6,350
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Quote:
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2017 Chevy Camaro 2SS A8 Whipple 3.0, Mast Black Label heads, ATI 8L90, Fore triple in-tank pumps, 112mm TB, LPE +52% injectors & BB HPFP, TooHighPSI/Katech port injection, 15” conversion 1066 WHP STD/1027 SAE, 9.10@152.5 (new times coming)
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08-30-2025, 07:09 PM
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Super Stock
Drives: Chevrolet Camaro ZL1 Join Date: May 2022
Location: Concordia
Posts: 1,004
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My issues are fixed for the record. It was a goof up in the tune that I oversaw when I did all the changes I needed to make in the file.
Quote:
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2017 Red Hot ZL1 A10 - Apex ARC-8's, 305/ 325 PS4's, DSX 9.06 12% lower, Griptec OE upper, NGK HR7 Ruthenium plugs, Nostrum 25+ injectors, XDI Goliath HPFP, Katech dual in tank LPFP, Katech oil pump, LME tensioner, DOD delete, LT1 big fuel cam, Jokerz ported blower, MPI lid, GMS hood extractor bracket, Granatelli SS plug wires, Cordes LTR reservoir, DMS T-stat housing, 186* LS3 T-stat, Borla X pipe, Black Widow Angry Housewife/ Corsa NPP mufflers, BMR engine mounts, Banks iDash, Lithium Battery, AEM X- Series, HP Tuners, E85, 16.5 psi
758 HP/ 804 TQ |
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