I was reading an article, till now, I thought you could only get the 180 hp
version of the 4.3 Liter in the 4x4 version S-10's and Sanoma, but I was
wrong, can I take the ecm under the hood from a 4x4 and hook it into a 4.3
Liter in a 2wd pickup? Would it work, if I tired it, is there a chance I
could screw my engine up? The 4.3 also had 190 hp output in 4x4's.
On Thu, 07 Jul 2005 01:46:48 GMT, "An American Revolution"
S refers to 2wd, T refers to 4wd in the S-10/Sonoma style trucks. The
model line is just S-series.
Regarding the original question, I'm not sure if that would work for
you, swapping a 4x4 ECM into a 4x2 truck. The big determining factor
is the year of the truck(s), but you may still have SES light issues
(or Service 4wd light issues) if the componets are not there or the
ECM isn't re-flashed.
You may be right, the difference may be in the ECM programming. I
also recall the possibility that the Y-pipe was a different design on
the 4x4 models, due to increased ground clearance and the need to get
around the front driveshaft. That exhaust change may account for some
of the difference. However, if GM specified 2 different VIN letters,
there's likely more than just ECM programming, there is likely a
We're overlooking another issue, maybe. In the 92-95 trucks, X and W
referred to 2 different 4.3L engines. One was a TBI with 160 HP (X)
and one was a CPI with 190 HP (W). TBI is Throttle Body Injection, it
looks like a carb on top of the engine with 2 injectors pointing down.
CPI was a batch-fire port-injection system, the top of the engine
looked like a spider (or insect since it was only 6-legged).
I think all New body style S-trucks use the CPI motor. So that would be
94 up for S/T Pick-ups 95 Up for S/T Blazers.
TBI 4.3's have a VIN code of Z in Astros, S/T S-trucks, Caprice's, &
full size trucks.
ECM programing will not determine a different VIN code from GM, it does
mean that something on or in the engine is different. That something
effects the HP rating of the engine.
Those are two different engines. Different wiring harness and other
items as well.
The X is a TBI engine it has what looks like a carb on it. It uses a
different cam as well
The W is a CPI engine (aka Vortec) it has a throttle body that only
meters air, this is fed through a plenum and six separate injectors.
Just swapping the computer wouldn't make a difference.
Basically - S-10 = Chevy 2wd small P/U or Blazer, T-10 = Chevy 4wd
small P/U or Blazer
S-15 = GMC 2wd small P/U or Jimmy, T-15 = GMC 4wd
small P/U or Jimmy
The Bravada is a T-series with a full time transfer case.
The numbers were used till the body style change. Then they switched to
Easy to tell the difference. If you have an air cleaner with a long
snorkel that goes to the top center of the engine you have a VIN X TBI
If the air intake goes to a unit at the front of the engine and the
intake has a cover that says VORTEC you have a VIN W CPI engine.
Or just look at the 8th digit in the VIN number.
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I wanted to take a 97 S-10 2wd with 175 hp X Vin 4.3L CPI FI, and put the
ecm from a 97 S10 4wd w/ 180 hp W Vin 4.3 Liter CPI FI into the 2wd. Are the
engines identical? Or is there different internal hardware? I just am trying
to gain that extra hp and torque.
Bullshit. I have a 97 S-10 with a 4.3 Liter, does not have throttle body.
The 8th digit is X, thats the engine code, and it is X! Maybe I cant just
swap computers, but X Vin is what i have. 95 and newer on the S-10's had
different setups on the 2wd, they had 175hp and the 4wd had 180, the 4x4 app
was w vin and the 2wd x vin. My owners manual say the same thing.
It's not classified as the HO because of the tow package. Your Jimmy
likely has the W engine with 190 HP, I think most of the Blazer/Jimmy
side of the line did, pretty sure all the 4x4 Blazer/Jimmy style
trucks had the 190 HP version...
Yea, I just talked to a machine shop down the road from me. He told me there
is no difference between x vin and w vin internally on the engine. So I
think it is ecm programming. Graff Chevrolet in Sandusky comfirmed it, but
said for me to swap ecms would be risky since a 4x4 has more sensors for the
4x4 application, and my 2wd doesnt, and could cause a problem.
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