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454 TBI Problems
lvoithoffer posted a topic in 1988-1999 Chevrolet & GMC C/K GMT400 PlatformI have a 1993 k3500 454 NV4500... The engine is a semi fresh rebuild(50K miles) with a small cam. I have replaced the following some parts multiple times... The truck has a stumbling rough idle. Seems to lack power to me but im not sure. If i take the truck for a short drive when i come back and go to instantly restart it has no fire from injectors....hit it with a little ether and shes up and running again. Im fairly positive i have that narrowed down to a weak oil pressure sensor.(changing it tomorrow). The truck runs pig rich and never seems to go into Open loop.(i think heated 02 will change that). I AM OPEN TO ALL SUGGESTIONS.. out of ideas myself. I have a ALDL cable with WinALDL & Tuner pro rt but quite frankly do not know what i am looking for I have attached a copy of my logs at a idle. https://docs.google.com/spreadsheets/d/1ZuvfldSA_rejBc0FAmCb38zTbHMIlfNR4CoTWgblQSU/edit#gid=361545408 Parts replaced less than 300 miles ago.( All new with AC Delco parts) Completely Rebuilt TBI unit with 2 inch spacer New TPS & IAC i did my best to calibrate them New map sensor Pickup Coil ( Timed at 4 degrees BTDC with connector unplugged) Cap rotor & Plugs & Wires ICM Ignition coil o2 sensor ( Re wired from ecu wire was broke assuming when they reinstalled the engine) *** I plan on switching to a heated o2 due to my long tubes. CTS Knock sensor (Wire was also broken) Newer fuel pump & Filter 15k ago with all new lines Im sure there is plenty others im forgetting. The EGR is deleted as are all other vac lines except MAP,PCV. I am at my wits edge with this truck but i love it very dearly. Hopefully the geniuses on here can help me figure it out. At this point any direction is better than none. Thank you very much you can email me at [email protected] Or text me at 724-570-8672 if that is easier. Lucas Picture of said truck causing me all this heartache