seabee
Junior Member
- Joined
- Sep 9, 2017
- Posts
- 29
- Reaction score
- 27
- Location
- South Carolina
- First Name
- Lee
- Truck Year
- 1987
- Truck Model
- R10
- Engine Size
- 305
Need some help on this , 1987 R10 305 TBI . Runs great but it’s getting to fuel . I keep getting code 45 running rich, I’ve replaced TBI with Holley 502-5 . When with GM TBI would get Code 45 . Truck is getting 6-7 MPG . Only code 45 no other codes. New fuel pumps in both tanks ,checked pressure at filter getting 15 psi .
Change o2 sensor 2 times and replaced it with 3 wire . Replaced ECM , 2 sets of plugs . Replaced plugs wires , cap , rotor , every sensor and module have been replaced MAP , IAC , coolant sensor, grounds have been replaced. What could be causing it to run rich . I’ve turned down pressure regulator on Holley TBI after talking to their tech department. Is 15 psi too much ? If I unhook IAC to adjust base idle engine will run at 1800 rpm . If I reconnect IAC it will idle back down to 800 rpm . Any help will be greatly appreciated. Thanks
Change o2 sensor 2 times and replaced it with 3 wire . Replaced ECM , 2 sets of plugs . Replaced plugs wires , cap , rotor , every sensor and module have been replaced MAP , IAC , coolant sensor, grounds have been replaced. What could be causing it to run rich . I’ve turned down pressure regulator on Holley TBI after talking to their tech department. Is 15 psi too much ? If I unhook IAC to adjust base idle engine will run at 1800 rpm . If I reconnect IAC it will idle back down to 800 rpm . Any help will be greatly appreciated. Thanks
