P59 swap for DBW to DBC
I'm at the point where DBC starts to make sense. Project is built on a 2005 Silverado 2500 HD. All references will be based on that platform.
Current P59 PCM is a (Blue/Green) 12589463 (no AIC driver) w/HDW 12589162.
I'd like to stay with a P59 to help keep the current wiring. I understand I will need to make some changes for the position sensor and the IAC. My harness has an 8-wire connector for the Throttle body and I intend to re-pin and reuse them for the DBC.
This is the list of potential PCM's & HDW I think will work:
2003: Serv # 12576106 ? HDW# 12570558
2004: Serv # 1258643 - HDW# 12583659
2005-06: Serv # 12589462 ? HDW# 12589161
2007: Serv # 12602801 ? HDW# 12589161
I am not running boost & I don?t think the Silverado had an alcohol sensor. Either way I have no intentions of running E85
1)Is this list accurate?
2) Can I swap my current tune into the new PCM ?
3) Are any of these a better choice ?
4) If there are any good procedures for tuning the idle on DBW please post a link
This last part is more curiosity that anything. Can I just solder in an IAC driver chip into my current PCM, change the IAC wiring and use a different OS system with my 12589463, like HDW# 1258961 ?
I may try it anyway after I get a proper PCM up & running. You just never know if this has been tried before so I thought I'd ask.
If you have everything for the drive by wire, why not just keep it?
honestly its worth it, especially if you want cruise control.
to me it looks better then the cable, and it feels better when you push the go peddle.
Youre going through the hassle of FI swapped into an old vehicle, why go back to a cable throttle?
The short answer is I can't get it to work. I've posted about my build before Here
my setup Is a 2005 Silverado 2500 HD Drivetrain and chassis. The engine is now a 408 stroker W a Brian Tooly cam.
Im running a DUAL THROTTLE BDY driven by the original 6L engines TB grafted to the side of one TB and used a rod linkage to drive the other. I have DUAL MAFS that are faulted on statup.
It's been problematic from the beginning. Occasionally I would get P2101 DTCs sending the truck into Limp Mode. I'd reset them and be on my way. After some time I raised the P2101 TPS Error to 10% Now I get p1516 codes and resetting these makes the trans act funny (this may be because Im still moving & in traffic when I reset it-not sure). After I shut off the truck and restart all is back to normal but it will soon Falt again.
I've replaced the TAC module, Pedal assembly, TB position sensor cover and the TB motor. It has had no effect.
I haven't captured when the DTC's set. It's usually after an Hour or so of driving. & I'm too busy in traffic to deal with it (limp mod on the garden state pkwy is no fun).The TAC module seems to get almost too hot to keep my hand on.
I have ohm tested and load tested every wire from the TAC to the pedal, The TAC to the Throttle body and The TAC to the PCM. No short, no problems found. All grounds have been Ohm & Load tested as well. I've gone thru every connection jack there is.
I have come to Hate the black magic bull thats associated with this DBW system thus the change.
I ignored the advise received on my first post to go to DBC and now I've paid for it in spades. I don't have the skill set to diagnose this. I don't even know where to begin. I've attached the speed density tune I'm using.
You can solder in the IAC driver in a p59 that never had it. Then you have to install an OS that was meant to be DBC. However, there will still be the issue of driving 2 IAC motors and recalibrating your relevant tables to work with that. Your current DTC errors could possibly just be an artifact of how you grafted the throttle bodies together. Have you made sure there is no sensor movement or shaft binding issues?
I gave the IAC wiring some thought.
I don't want to drive both IACS from one driver for a couple of reasons. First, I don't see how the PCM will know if the second IAC is retracted. Secondly, I'm concerned about overloading the PCM. Trying to drive 2 stepper motors with one driver in the PCM could be bad.
I have a lathe & a small mill. I'll make two plugs that will install in place of the IACs on the DBC TBs. The plugs will plug the air feed holes & will feed the idle-Air ports (behind the blade). From the plugs I'll run 2 lines to a common "T" block that will accept the IAC stepper motor. The "T" will be fed from both intake tubes after the MAF sensors. That should give me 2 air ports supplying 2 idle-air ports using 1 IAC.
For the position sensor, I'll only use the one on the TB that gets the cable from the pedal. For the second TB I'll use adjustable linkage and most likely remove the return spring from the second TB.
As for the current linkage setup. Its rock solid and has no play in anything. It works freely with no binding at any temperature and only uses the OEM return spring in the TB. The second TB is just along for the ride.
Btw I ordered a couple of IAC drivers just for the fun of it. My Current P59 PCM is a (Blue/Green) 12589463 (no AIC driver) w/HDW 12589162. Any suggestions on an HDW # to use should I solder it in?
12589161 maybe ?
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