Trying to get my suburban to pass.
Test number one:
Gas cap - pass
Pcv - pass
HC loaded 154ppm, 300ppm allowed - pass
HC idle. 427ppm, 300ppm allowed - fail
CO loaded 0.90, 3.00 allowed - pass
CO idle. 1.30, 3.00 allowed - pass
So I went home, checked for vacuum leaks, tried to read the voltage in the o2 sensor with no luck, checked tps voltage, checked timing, and adjusted the throttle blade set screw. Everything checked out fine, and I opened up the throttle blades a bit to let in a little more air at idle.
Test number two:
HC loaded 130ppm, 300ppm allowed - pass
HC idle. 605ppm, 300ppm allowed - fail
CO loaded 0.87, 3.00 allowed - pass
CO idle. 1.20, 3.00 allowed - pass
From these result. Would it be safe to say that problem is caused by the engine running lean? Ive done the Ultimate TBI Mod, spaced the injector pod, took the ridges off the top of the bores, and made my fuel pressure reg adjustable. From the factory, the adjustment table in the reg was all the way out, no pressure. I brought it up to a little over half. I dont have a way to test psi currently. I just changed the oil, spark plugs, plug wires, and ocv valve. The coil and fuel pump is 2 months old. I did the tbi mod 3 months ago. The old spark plugs were kind of a red-ish brown, but were a little chalky. Is it safe to assume high HC and low CO is a lean burn?