The 1992 to 1994 Engines the differences are: Intake manifolds, fuel
injection type, cam grind, valve covers, throttle body type.
TBI is Throttle Body Injection. This means the Fuel Injectors reside in
the Throttle Body (like a carburetor with fuel injectors inside instead
of venturis or "barrels"). This type fuel injection uses a intake
manifold similar to a Carbureted engine. On 1990's TBI 454's they are
Carburetor intake manifolds with a adapter plate for the TBI unit.
CPI is Central Port Injected. The Throttle Body handles no fuel, just
air. The Injector(s) sit in the middle of the lower intake manifold with
plastic fuel lines that run to the head port. The lines carry the
atomized fuel, and it mixes with the air at the head port when the
intake vales open. similar to GM Multi-Port Fuel Injection, except the
Injector(s) are remote mounted, with feed tubes running to each cylinder
instead of a injector at each cylinder. CPI injection units are known as
CPI engines use composite plastic valve covers, TBI engines use stamped
steel. The cams are supposed to be different grinds. Yet are close
enough if you convert a TBI to CPI, or CPI to TBI, they run just fine.
Later 1995 up CPI engines have a Balance shaft, that is above the cam
galley, running threw the lifter valley.
Thanks Charles for the info.I just bought a 93 S-10 Blazer 4.3 CPI
engine and was wondering what parts where interchangeable with my 88
S-10 Blazer 4.3 tbi.So below the heads everthing is pretty much the
same.Also the CPI engine is dumping gas into the oil pan?i just gave a
couple hundred bucks for it ..I'm mainly just gonna use it for parts.It
ran long enough to get it on the trailer...now it cranks but won't
run..hopefully the trans. is good.....Bobby
Lift the top of the plenum off and see if it is filled with fuel. The
plastic lines inside crack and leak, flooding the engine. We took our
plastic lines off and replaced with regular fuel injector hose for about
$8.00 and it ran great.
We are looking for one of those cheap S-10 Blazers for a project we are
How cheap? I have a 94 here that could be looking for a new home.
It's a 4.3 Vin W 4 door. Needs one exhaust manifold, front fenders, fuel
lines (those will probably be replaced real soon). Door bottoms are
rusty but still solid.
I'll pull the upper plentium tommorrow..I appreciate all the info.It's a
93 S-10 CPI Vortec W code 200,500 on the odometer,4 door.It does have
ABS on it ...I'm stripping a lot of stuff off of it....had a lot of rust
in the cooling system.I
took the radiator off..ran water through it....and I never seen so much
rust..like muddy water.Checked antifreeze..only floated 1 ball..rust
probably floated that.How can I tell what kind of automatic Trans. is in
it?Thanks! for the help!
When you took the plenum off and fixed the cracked hoses with regular
fuel hose for 8 bucks,didn't you have to replace the gasket that sells
for about 14 bucks?Just wondering....haven't taken it apart yet and
checked site at advance auto..and got the price on the plenum
The gasket was brittle & baked fell apart.
Has to be replaced.When I get the fuel regulator...and install it then
i'll look for leaks again ...before I put the penum back.Did you install
the larger hoses(inlet...outlet)If so how do they connect on the back
where they come through the lower manifold?I'll bet those smaller poppet
line clips are easy to break.The junk yard here wouldn't let anyone take
parts off engines.Take Care!
You can use the whole CPI engine with the TBI Intake & distributor. The
wiring harness under the hood will be different and the ECM will be as
The transmission is where you need to watch out. If it is a 4l60-E it
will not interchange. If it's the older style I will.
If you need to change the rear end, and want to keep the ABS you may
have to switch parts. Some 1993 & 1994 blazers are 3 sensor ABS some are
4 Sensor. 4 sensor trucks have wires coming out of brake backing plates,
with a abs wheel on the axle, 3 sensor trucks have no wires coming out
of the brake backing plates.
88's use the old style grill. The 93 uses the new style, to swap with
out headaches swap the core support as headlamp adjusters are in
Other then a few items, 84 to 94 S-10 blazers are pretty interchangeable.
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