ErikL
Newbie
Hi everyone,
I've only had my truck ('99 c3500, L29 454, ~127K miles) for a few months. I've been reading up on the forum about the MPFI Spider conversion and have some questions specific to the L29.
6 weeks ago when I was cruising on the highway at 60 MPH the check engine light came on. When I scanned it it showed codes P0172 & P0175 (System Too Rich Bank 1, System Too Rich Bank 2). The LONGFT1 was -14.1%, LONGFT2 was -17.2%. Looks like the ECU is consistently trying to reduce the fuel injected. I have noticed that exhaust smells rich when idling. I have not had any drivability issues. Truck starts perfectly when cold or hot. Fuel mileage has been ~10MPG in the city (unloaded), 13-15MPG on the highway (unloaded), and 7MPG on the highway (towing 6000 lbs fifth wheel). I cleared the codes and they haven't come back in the last couple hundred miles of driving and towing.
From what I see, I think they injectors are not leaking. I'm thinking the CPI Spider could be upgraded. The parts that I've seen referenced (i.e. AC Delco 217-3029) all say they fit the 5.7 Vortec, but never state that they fit the 7.4 L29.
My questions for those with the knowledge are:
Can I use the upgraded MPFI on the L29? Most state that they are only for the 5.0 or 5.7 L.
Has ACDelco 217-3029 been superseded by 19210687?
Thanks
I've only had my truck ('99 c3500, L29 454, ~127K miles) for a few months. I've been reading up on the forum about the MPFI Spider conversion and have some questions specific to the L29.
6 weeks ago when I was cruising on the highway at 60 MPH the check engine light came on. When I scanned it it showed codes P0172 & P0175 (System Too Rich Bank 1, System Too Rich Bank 2). The LONGFT1 was -14.1%, LONGFT2 was -17.2%. Looks like the ECU is consistently trying to reduce the fuel injected. I have noticed that exhaust smells rich when idling. I have not had any drivability issues. Truck starts perfectly when cold or hot. Fuel mileage has been ~10MPG in the city (unloaded), 13-15MPG on the highway (unloaded), and 7MPG on the highway (towing 6000 lbs fifth wheel). I cleared the codes and they haven't come back in the last couple hundred miles of driving and towing.
From what I see, I think they injectors are not leaking. I'm thinking the CPI Spider could be upgraded. The parts that I've seen referenced (i.e. AC Delco 217-3029) all say they fit the 5.7 Vortec, but never state that they fit the 7.4 L29.
My questions for those with the knowledge are:
Can I use the upgraded MPFI on the L29? Most state that they are only for the 5.0 or 5.7 L.
Has ACDelco 217-3029 been superseded by 19210687?
Thanks