My truck did not run rich with a 5.9 PCM (wideband verified).

 

Anyone on a fuel pump recommendation? Certainly someone has thrown one on and had good luck.

 

Phase One of Harness thindown complete:
Each engine harness wire is identified, traced and labeled. I have gone through the PCM pinouts schematic and drafted a plan of attack of the thindown. What makes the cut... so to speak. I have a list of what makes it and what doesnt, but before I get to chopping away at wires, I wanted to get your opinions on my choices. Is there anything I have chosen to remove that I will regret later, or something I chose to keep that is un-needed? They are in order as listed on the PCM pinout Diagram. (Please note that I will not be using an automatic trans or A/C)


Things to keep:

MAP Sensor Signal
Engine Coolant Temp Sensor Signal
Fused B+
Sensor Ground(s)
5v Output (MAP + TPS)
8v Supply (CAM.ps CR.ps VSS)
Fused Ign SW output (Start and Run)
Injector drivers (1-8)
Ignition Coil Driver
Generator Field Control
Intake Air Temp Sensor Signal
Throttle Position Sensor
Crank Pos. Sensor signal
SCI Transmit (Data Link)
Park/Neutral Pos Switch sense
Malfunction Ind. Lamp
EGR Solenoid Control
Right Heated O2 Sensor
Tach Signal
Cam pos sensor signal
SCI Recieve (Data Link)
Auto Shutdown (ASD) Signal
Evap/Purge Solenoid Sig Control
Service Reminder Ind Lamp?
ASD Relay Output
Idle Air Control Motor Drivers.

Things to Delete:
Trans OD Switch Output
Left Heated O2 Sensor - Not an option on my truck
A/C Request Signal
Stop Lamp Switch Output
Trans Temp Lamp Driver
Vehicle Speed Control-Vac Sig
A/C Comp Clutch Relay Control
Trans Control Module
Trans Temp Sensor
Vehicle Speed Sensor Sig
VSC Switch - Set
VSC Switch - Output (On)
VSC Switch - Resume/Accel
VSC Vent Signal
Up Shift Lamp Driver - Needed?
TCC Solenoid Control (Torque Converter)
Overdrive Solenoid Control

 

Do you have A/C on your truck? PCM uses the sense signal to bump idle a bit when the compressor is running.

 

I do not, although I now that I know that, I may save that wire for later down the road. Thank you. Anything else?

 

A couple of the things you want to delete are going to set codes. VSS, being right up there on the list.

I would be tempted to leave the cruise control stuff as well, as installing it would be a dead simple operation......

Don't worry about the shift lamp driver. That is more for fuel economy than anything else.

 

I would love to run the cruise control stuff, but my t-case is from an earlier model truck to accomodate the pass side diff. Therefore, no vehicle speed sensor.

As for the shift lamp: I thought so, but I wasnt sure if it would freak the PCM out, not seeing a "dummy lamp"

 

Hhhmmm... Ever consider using a pcm/harness from a 96 or newer truck? that would give you the ability to re-flash the PCM.... and perhaps eliminate a few of the ****les that are going to keep your CEL on.

 

I thought about it, but the complete engine, harness and PCM came from the same vehicle and it was cheap. $150 bought it all. Also, I will eventually stumble on a manual trans PCM. That will eliminate many of the codes. Besides, I will put the CEL in the glove box, so I wont have to look at it anyway unless I want to run codes.

 

this is probably the best idea anyways. then you can put your headlights and other things on relays that car companies did not put on relays until a lot later.

you might be able to use a vehicle speed sensor out of a 91 or so dodge ram. should just screw into the transfer case but then you would also have to get an electric speedo unless you could find a speed sensor out of a 88-89 ram or 88-93 Dakota. they are suppose to be able to be hooked up to mechanical or electrical speedo's.