dbittle

Wow! Nicely done staying with it and finding the problem. Good job 👍

maxvp01

SOLVED!!!

Just wanted to follow through and let everyone know the injectors were 100% the problem for running rich. My MPG proves it! I got a whopping 18.9 MPG on my last tank! Nearly double!! (158 miles to the halfway mark on gas gauge)

So it turns out there was a mix of problems at the beginning of my thread, and it took all of this time to knock them out 1 by 1. The engine runs incredibly smooth, smells so much better, and now gets great MPG!

I just want to thank everyone that has chimed in with ideas and comments that have helped me make it to this point on solving this headache of a problem!

YOTATECH FTW!

maxvp01

Also I still plan on making that homemade injector flow tester, and will make a post of the steps to fab that up once I come across a fuel rail for one of these trucks.

This next part is for future people trying to diagnose their rich condition- this is what I followed when narrowing down the problem:

EFI CIRCUIT:
-ECU
-Wiring Harness
-AFM
-IAT
-ECT
-TPS
-O2

Mechanical:
-Fuel Pressure Regulator
-Injectors
-Vacuum Leak
-Exhaust Leak (before O2 sensor)
-Spark
-Timing

(List is in no particular order)