2007 Chevy Tahoe engine swap

[West 1]

I think the only hope would be to use the entire wire harness from the 2011 and all modules that go with it. Might be far too much work but the body should accept everything since they really did not change. Swaps were simple before all the electronics.

 

[j91z28d1]

I don't think he should flash anything if he's going to install all the '11 stuff.
Might have to add the fuel system control module from the '11 as well....
@SpareParts was mentioning returnless system, might you need the fuel pump from the '11 as well?
Try a scanner if still not starting?

2007
View attachment 465780

2008
View attachment 465781

yeah I was thinking that he wanted to keep as much 07 stuff as possible.

 

[swathdiver]

He'll need the cluster and shifter from the donor as well, probably the wiring harnesses too. It's quite a task.

To get running, should have just swapped the block and heads over and reused everything else and left the VVT unplugged since the 2007 won't be looking for it.

The 2007 SUV is wired differently than all the other GMT900 SUVs with regards to the fuel system, you cannot view fuel pressure through a scan tool on that year for example. BTDT.

 

[mikez71]

Forgot about the cluster! Though I believe you can drive without the cluster.

Personally, I would want to swap everything to gain the 6speed.
You may also need a transmission tune if your rearend ratio is different than what the '11 had.

Monday might have to wait...Can you get a loaner vehicle anywhere?

 

[rdezs]

Just contemplating the predicament makes my head hurt....

There's only one way I see this actually feasible. Keep the original transmission installed, or get a rebuilt unit.

On the 2011 engine, delete the AFM and the VVT. Get a new OEM camshaft for the engine you just pulled out, and install that. (At that point might as well replace the lifters, timing chain and oil pump while you're at it)
The 2011 is likely flex fuel, which is different injectors. To keep keep it simple, use your old intake, fuel rail and injectors. If you're old engine has the knock sensors under the intake, they do sell an adapter harness to connect to the knock sensors on the 2011 that are on the sides of the block. Same for the camshaft position sensor. They also have an adapter to switch between the two different reluctor sizes. And then just run your OEM ECM and whatnot. Basically you're just fooling your ECM that it's the same engine.

The other route of totally bringing over the engine and transmission along with the ECM, TCM and whatnot..... Is likely time prohibitive and complex when you run into some modules that you can't just program, but will have to be replaced. You're likely talking about 75% of the entire harness of the vehicle being swapped, with splicing in on the other 25%.

 

[Christian978]

I "think" they still have to be programmed to the truck by VIN.

@91RS

Some of these comments don’t make sense not trying to offend anyone but if you don’t know please don’t guess just makes me second guess myself off something that’s not a fact the truck knows no difference if I change steering column and bcm everything will be the same the Tcm is built into the valve body on 4l80 so that means only thing left to try is changing the steering column and bcm so the chip key matches thank you all for your help

 

[Christian978]

Just contemplating the predicament makes my head hurt....

There's only one way I see this actually feasible. Keep the original transmission installed, or get a rebuilt unit.

On the 2011 engine, delete the AFM and the VVT. Get a new OEM camshaft for the engine you just pulled out, and install that. (At that point might as well replace the lifters, timing chain and oil pump while you're at it)
The 2011 is likely flex fuel, which is different injectors. To keep keep it simple, use your old intake, fuel rail and injectors. If you're old engine has the knock sensors under the intake, they do sell an adapter harness to connect to the knock sensors on the 2011 that are on the sides of the block. Same for the camshaft position sensor. They also have an adapter to switch between the two different reluctor sizes. And then just run your OEM ECM and whatnot. Basically you're just fooling your ECM that it's the same engine.

The other route of totally bringing over the engine and transmission along with the ECM, TCM and whatnot..... Is likely time prohibitive and complex when you run into some modules that you can't just program, but will have to be replaced. You're likely talking about 75% of the entire harness of the vehicle being swapped, with splicing in on the other 25%.

Yes I swapped the motor,transmission and transfer case.I changed wiring harness for engine and fusebox and the transmission wiring harness I’m heading back over to the other vehicle now to pull bcm steering column and maybe the body wiring harness. And I swapped fuel tanks and pump as well. I wish I had the money to rip all that nonsense out of the engine I would have did that originally but I got the vehicle for free not realizing until I was into it deep. The wife and I have 6 kids (2to15) altogether full time. No help from other parents so it’s hard to find a vehicle I can fit us in. Thanks again for your help.

 

[rdezs]

Did you replace the entire fuel system from the donor as well? It should be flex fuel, and will be looking for the fuel sensor as well. Forward of the fuel tank, in line ...

 

[rdezs]

Not sure, might need the correct ABS module as well....

 

[swathdiver]

Did you replace the entire fuel system from the donor as well? It should be flex fuel, and will be looking for the fuel sensor as well. Forward of the fuel tank, in line ...

No FlexFuel sensor on these.

 

[rdezs]

I would have expected the 2011 to be a flex fuel.

 

[j91z28d1]

I would have expected the 2011 to be a flex fuel.

gm does flex without a physical sensor on these trucks.

 

[swathdiver]

I would have expected the 2011 to be a flex fuel.

2010-2014 were all FlexFuel, they call it a "virtual sensor" the calculations being done by the oxygen sensors. That's why it's so important to make sure they're in good condition, changed in pairs and the best are OE.

 

[rdezs]

I've got one of these in the fuel line under the driver seat along the frame rail....

 

[Christian978]

2010-2014 were all FlexFuel, they call it a "virtual sensor" the calculations being done by the oxygen sensors. That's why it's so important to make sure they're in good condition, changed in pairs and the best are OE.

So I’m not getting fuel but I also have o2sensors unplugged I’m gonna replace them in the morning and try it. I’m trying to figure out if I swap bcm if I will get crank on the 2011 computer. Right know I only get crank no start with 2007 computer but I’m using 2011 harness. Thanks for the help I have the other truck still I’m gonna pull the harness out tomorrow that goes to that plug. Im just hoping I don’t have to change rearend and interior pieces and if do I just wanna get it done

 

[Christian978]

The 2011 has VVT, the 2007 does not, so the earlier computer is not going to be looking for a VVT signal while the later one will with their current programming. Besides, the computers have to be VIN matched to the vehicle.

Not sure why you would have to swap columns.

I cannot say with certainty what that plug is for, it escapes my mind.

So I guess one question is what determines the vin the bcm and the key needs to Match to the bcm so I’m gonna pull column to just to be safe

 

[Christian978]

I think the only hope would be to use the entire wire harness from the 2011 and all modules that go with it. Might be far too much work but the body should accept everything since they really did not change. Swaps were simple before all the electronics.

I agree I’m going over tomorrow it’s Gonna be the cheapest solution I already have fuel tank out I’m gonna change it all we didn’t have chipped keys and bcm when I did swaps as long we had the whole harness and bcm

 

[Christian978]

So I guess one question is what determines the vin the bcm and the key needs to Match to the bcm so I’m gonna pull column to just to be safe

I’m thinking the plug may goto fuel tank

 

[j91z28d1]

for the fuel system. I would first confirm if your 07 has the returnless style fuel system like the 2011. the returnless has a fuel pump module that controls the speed of the fuel pump to adjust fuel pressure. the more normal style your 07 might have is just a fuel pump relay that sends full 12v to the fuel pump and adjusts fuel pressure manually.

I don't know forsure that your 2011 ecm wouldn't run with the older system, but since the ecm turns on that fuel pump relay, I'm guessing the 2011 ecm and harness wouldn't be wired to turn it on, so you'd have no power to the pump.

if that makes any sense. only quick way I'd know to check would be see if the fuel pump relay spot in the original fuel box is there. as I understand it, that spot is empty on the newer returnless fuel systems. that and the fuel pump control module wouldn't be installed, but I'm not 100% sure where that is. I believe it's under the drivers side seat area underside, but also all the abs stuff is under there too. so it's kinda a mess down there.

 

[j91z28d1]

I've got one of these in the fuel line under the driver seat along the frame rail....
View attachment 465904

first I've heard of this Gen having a physical sensor. wonder if it's a caddy thing or 2014 thing.

either way that's really nice. i might have to look into wiring diagrams and see what pin the data line runs to.