1997 2.3 timing at idle

[Grasshopper97]

Hello everyone. I am new here so i will give some background. My16 year old grandson was gifted a 97 ranger 2.3, automatic that ran when parked 5 years ago. We have cleaned the fuel system and installed a new pump, replaced timing belt ,plugs, wires, fuel injectors, MAF,TPS and IAC. Compression is 160 psi per cylinder with engine warm and fuel pressure is 40 psi and the pressure return valve works. It is setting a P1121 code. TPS A inconsistent with MAF/MAP. The timing is hovering around zero at idle and does not advance beyond 25 degrees total. Vacuum at idle is 15 inches and goes up to 18 when RPM is increased. It idles rough and is running rich. I was wondering if someone might have experience with this code and what the solution was.

 

[scotts90ranger]

Welcome!

As to the title of this thread, the timing is completely set by the computer based on airflow and rpm basically and the idle timing is generally pretty low especially when it thinks it is at load at low speeds (IE there's a load on the engine or it's running bad like yours), annoyingly it gets worse at high air temperatures, I put a 20k ohm resistor across my air temp sensor to trick it to thinking it's always 80F out which helps once it's warmed up since I was going to -5 degrees of advance watching it on Torque Lite, needless to say it was gutless then...

What about the primary oxygen sensor? That would make it run rich once it's in closed loop, if you connect to the OBD II system with something what are the fuel trims doing?