Emmisions

Your vehicle is running pretty rich. Scan the computer for misfire codes or 02 sensor faults. Remove the spark plugs and check to see if any are wet with fuel. If they are then do a compression test. If compression is low then a cylinder leakage test should be done to see if you have a bad valve or piston rings.

Just curious, how is the vehicle running over all? It may be running rich, but replacing the engine seems a bit drastic without diagnosing anything. You only have 106,000 miles.

With those numbers I am surprised the light has not come on. You should still have it scanned for codes.

Yes for sure, that HC (hydro carbon) number is very high. That is raw unburnt fuel. Your Oxygen sensors should be pegged out right now trying to get that engine to go lean. They are probably coated in black carbon right now. I would like to see the live data stream from the ECM, very curious to see whats going on. That first fast idle test is off the charts 7.66% CO. (Carbon monoxide)

Something is going on and yes want to see those fuel trims and see if system is not stuck on open loop?

Yeah that's a good thought, it wouldn't even be reading O2's in open loop, I wonder how good the coolant sensor is reading, although all this should still have set some sort of code. Unless the ECM is shot, or the check engine light bulb is burned out, seen that before.

Your right, maybe that is why the check engine light is not on? Bulb could also be burnt but scanning the system should put out a code.

Hey SIMON

I am thinking it could be a leaking fuel pressure regulator or a coolant temperature sensor that has gone bad, please remove the spark plugs to see if and are black. Also with the scanner hooked up snap he throttle to see if the TPS sensor is working.

Best, Ken

Yes remove the sparkplugs and see what they look like, also you might try putting a fuel pressure tester on there and see if it holds the pressure or if it leaks down, You may have a bad O2. There sensor readings for the O2 live data should be fluctuating between 0.1 volts and 0.9 volts. If it is just staying right around 0.5 like that reading is saying, the O2 is not reading any oxygen and may be no good. The fuel trim is reading alittle negative but not a whole lot. It should be reading a lot more with HC reading like you have there. The ECM should be going super lean trying to compensate for a reading like that. I would expect HC that high, that the O2 would be trimming the fuel a huge amount. That's the point of the O2 sensors. To keep the air/fuel ratio correct 14.7 to 1.