454 TBI Problems

[lvoithoffer]

I 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

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I have attached a copy of my logs at a idle.
https://docs.google.com/spreadsheet...mCb38zTbHMIlfNR4CoTWgblQSU/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. Ive read possibly the egr delete may be affecting this??

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

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[bobby v]

Misery loves company I guess, I have a high idle and hestation that doesn't want to go away. I have replaced the MAP, IACV.TPS, new plugs, air filter, fuel filter, bunped up timing and also found that hidden idle adjustment screw, I picked up the ECT Sensor this afternoon.
If I start it its great, at 750rpms, but give it any gas and then it comes back down/stays at 1000rpms, turn it off and restart, back to 750rpms Frustrating!!
Hopefull the coolant sensor will correct this but I doubt it.
Good luck with yours
Bobby V

 

[PlayingWithTBI]

vacuum leak?