5 Liter Eater

Anyone ever done this? I have a line on a complete '07 harness/PCM/BCM.

Suns_PSD

Huh?

realcanuk

Interesting question. Can't think of any reason it wouldn't work if you change it all.

5 Liter Eater

Yea, just throwing around crazy ideas while the car is down. Thinking it's going to require removing the dash to swap out all the wires and BCM.

cclive

Interesting, but I have no idea what the subject is....

5 Liter Eater

Lol. For those not in the know the '05 came with a different PCM than all later model years. It's kind of a bastard child because of the limited usage. Switching to the new PCM has several advantages.

erick_e

These kind of projects interest me as well. I've wondered if I could swap a E38 with an E67.

I wonder if it would be easier if you just swapped the cavity plugs at the ECM; obviously you would have to know the pin layout of both controllers.

Joe_G

I've wondered myself Bill, but, what issue specifically won't your computer allow you to change? I've found I'm able to adjust everything I wanted to with my E40... of course, I certainly don't test the E40 limits like you do.

Thinking out loud here, I wonder if the BCM is going to like being married to the new computer. I know when guys put our engines, or E38 engines more specifically into hot rods or muscle cars, they have to have the security systems disabled.

I guess to state my top question more specifically, I bet this will be a lot of work, of course not impossible. Diabosport in Delray Beach near me got the Hellcat computer working in the old Dart on Fast and Loud so I'm thinking anything is technically possible, but the real question is why. What problem are you trying to solve by doing it and is that problem so large that it's worth the headache and cost?

I realize you haven't had many headaches with your car lately <ducks the right cross at his head> lol

5 Liter Eater

I thought of repining but the pins are different on the PCM's. The E40 is round pins and the E38 is small spades.

Really there isn't much advantage Joe. I've been able to work around things like the injector limits by scaling the tune 50% and doubling stoich (yes both to get my 2k FIC injectors to work). It has the 2.5 bar SD OS with HPT. No real obvious advantages other than faster framerate when scanning but apparently HPT 3.0 negates that advantage.

The main reason is I have a reoccurring cam sensor code issue I've been fighting for literally years. Ohmed wires, continuity tests, splitting off the sensor wire to verify cam counts along with HPT. Replaced the portion that goes up along the timing cover. After moving the PCM for the UPP kit it got lots more prevalent. Then we found that if I jiggle the harness by the PCM it goes away and then comes back randomly. Since my motor is out I'm going to cut open the harness and look for anything obvious and had thought about replacing the harness altogether but that's costly. So the deal on the E38 stuff got me thinking. Yes the BCM and PCM are married by VIN.

Joe_G

Bill I think trying to change out will open a can of worms for virtually no benefit. You mastered tricking our old computer into doing what you want and while our scanner is slow, it's not as bad as a c5 and it's always gotten things done for me, sounds like you too.

I'd be checking the wiring up around the PCM just as you said, particularly the connection of the cam sensor wire into the the pin and then into the PCM connector, before I cut into the harness, finding nothing there, I'd certainly cut into the harness and look for a break. As you know they often happen at stress points.

I've not upgraded to 3.0... what did that do to the scanner for us?

edit - you could just buy a pin and run a new wire and pin it into the connector for your cam sensor, and bypass the bad wire. That's save a lot of headache... I was able to very accurately put a delphi pin on a wire in my harley with out the special crimping tool, I just looked at the others and did it with small pliers, it's not magic. Sort of like your fan connector back in the day! lol

schpenxel

I mentioned this to 'Steck one time and his response was basically the 05 BCM may not play nice with an E38 ECM, so doubtful it's worth the effort (if it's even possible short of changing BCM and God knows what other modules)

Scanning on HPT V3 is pretty decent now, even on an E40.

Honestly I wouldn't bother. Either go standalone or leave it as-is

5 Liter Eater

You're probably right. Lots of work to run all the new stuff, redo my tune, debug new gremlins, etc.

I haven't upgraded either yet but apparently the 3.0 version uses the bus a lot more efficiently and scans all the PCM platforms much faster.

I looked at the pins in the PCM connection when I pinned it for my Flex fuel and have taken it apart again after it acted up. It looks good. So the next thing is looking at the wires themselves. And yea, worse comes to worst I can run new wires to the cam sensor.

5 Liter Eater

I'm proposing replacing the BCM with an E38 version as well, but honestly I don't know whether the leads from it to the things it controls are pinned the same.

But, but, but, it would get rid of the need to put the car in reverse when shutting it down!

schpenxel

I vote standalone

Joe_G

That is one benefit indeed!

DSteck

Swapping your engine too? E38 requires a 58x reluctor and a 4x on the cam. Any CAN module would have to be replaced along with anything that runs on a serial line because the protocol will be different. Gauge cluster, door lock receivers, even the radio may not function unless replaced.

Joe_G

^^^ Well that answers that.

0Chuck CoW

I feel sad.... Nobody talked to ME about it.....

What gives Joe G?!?!?!

Chuck CoW

jeremysz

I’ve wanted to do this to my 2005 as well for all the above reasons as well as being able to run a 6l80 trans. If you decide to do it let me know what all was needed to do the swap.

Unreal

New motor (or atleast pull crank out and swap reluctor), new harnesses, all new computers, few new sensors, tuning, etc.

Would be cheaper to sell your 05 and buy an 06+