c5 running extremely rich
Thread Starter
Heel & Toe
Joined: Apr 2022
Posts: 19
Likes: 1
From: Los Angeles
c5 running extremely rich
Good afternoon all! i have a 2001 corvette, 6spd.
HCI, full exhaust. recently my AFR gauge started reading in the 8’s thought it was weird. smelled a lot of gas as well. sure enough i get home and the exhaust has white steam coming out smelling like gas, and raw fuel dripping onto the floor. additionally, my catch can smelled like fuel, and my dipstick has tons of fuel on it as well. i don’t have a tech 2.
some more information, i ran the car outside, and unplugged every injector, the car ran until i unplugged the last two. then it finally died.
only codes are for MAP, which has been there forever. additionally, even when the car is sitting overnight, before starting the car key in on position, the AFR gauge reads 8. seems as though there are some stuck injectors.
HCI, full exhaust. recently my AFR gauge started reading in the 8’s thought it was weird. smelled a lot of gas as well. sure enough i get home and the exhaust has white steam coming out smelling like gas, and raw fuel dripping onto the floor. additionally, my catch can smelled like fuel, and my dipstick has tons of fuel on it as well. i don’t have a tech 2.
some more information, i ran the car outside, and unplugged every injector, the car ran until i unplugged the last two. then it finally died.
only codes are for MAP, which has been there forever. additionally, even when the car is sitting overnight, before starting the car key in on position, the AFR gauge reads 8. seems as though there are some stuck injectors.
Tech Contributor
Joined: Jan 2007
Posts: 19,359
Likes: 1,127
From: Dyer, IN
Good afternoon all! i have a 2001 corvette, 6spd.
HCI, full exhaust. recently my AFR gauge started reading in the 8’s thought it was weird. smelled a lot of gas as well. sure enough i get home and the exhaust has white steam coming out smelling like gas, and raw fuel dripping onto the floor. additionally, my catch can smelled like fuel, and my dipstick has tons of fuel on it as well. i don’t have a tech 2.
some more information, i ran the car outside, and unplugged every injector, the car ran until i unplugged the last two. then it finally died.
only codes are for MAP, which has been there forever. additionally, even when the car is sitting overnight, before starting the car key in on position, the AFR gauge reads 8. seems as though there are some stuck injectors.
HCI, full exhaust. recently my AFR gauge started reading in the 8’s thought it was weird. smelled a lot of gas as well. sure enough i get home and the exhaust has white steam coming out smelling like gas, and raw fuel dripping onto the floor. additionally, my catch can smelled like fuel, and my dipstick has tons of fuel on it as well. i don’t have a tech 2.
some more information, i ran the car outside, and unplugged every injector, the car ran until i unplugged the last two. then it finally died.
only codes are for MAP, which has been there forever. additionally, even when the car is sitting overnight, before starting the car key in on position, the AFR gauge reads 8. seems as though there are some stuck injectors.
Instructor
Joined: Nov 2013
Posts: 144
Likes: 22
From: Lees Summit MO
Check your Fuel pressure, I had a similar issue after replacing the Fuel filter in my 2000 FRC. The Fuel pressure regulator on the 99 and later were moved to the fuel filter. I installed an after market Fuel Filter and after a few days I realized it was running really rich. I checked the fuel pressure and it pegged my gauge at over 100 psi. I replaced the fuel filter and the issue was resolved. fuel pressure on the LS1 is appox 59 psi if I remember correctly.
Last edited by Roman 1; Mar 13, 2025 at 01:50 PM.
Thread Starter
Heel & Toe
Joined: Apr 2022
Posts: 19
Likes: 1
From: Los Angeles
no doubt. the map code has been there forever. almost a year. never ran rich always stayed between 12.5 and 13.9
Thread Starter
Heel & Toe
Joined: Apr 2022
Posts: 19
Likes: 1
From: Los Angeles
Check your Fuel pressure, I had a similar issue after replacing the Fuel filter in my 2000 FRC. The Fuel pressure regulator on the 99 and later were moved to the fuel filter. I installed an after market Fuel Filter and after a few days I realized it was running really rich. I checked the fuel pressure and it pegged my gauge at over 100 psi. I replaced the fuel filter and the issue was resolved. fuel pressure on the LS1 is appox 59 psi if I remember correctly.
i never knew this! thanks for the info. i dropped my injectors off at the cleaners, i’ll have em back on monday. got an extra filter laying around from my racecar i’ll throw it in.
