Chevy Blazer S-10
Ford Windstar GL
Chevy Trailblazer

Is there a common or frequent problem with fuel injection or sensors on a 1994 S-10 Blazer?

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Wiki User
2006-08-23 10:11:27

Absolutely. The problem is common with all the GM vehicles made

between 1992 - 1995, that have the 4.3L Vortec vin code "W". The

4.3L Vortec has a CPI (Central Port Injection) system that has

proven to be quite problematic. These injection systems consist of

a large fuel injector that has tube going to each cylinder (six

total). This injector is located in the plenum. (must remove upper

intake to see it) The problem with these systems is that they

develop leaks, these leaks occur in either the FPR (fuel pressure

regulator) mounted on the side of the injector or the internal fuel

lines leading to the injector assembly (GM has decided to refer to

these internal fuel lines as a "Nut Kit" for some reason). The FPR

is located on the passenger side half of the intake, and the nut

kit is located on the driver side of the intake. The cylinders on

the side that develops the leak, get flooded by fuel causing a rich

condition. This rich condition can cause the engine to run rough,

create a strong smell of raw fuel, set O2 sensor codes, cause

excessive carbon build up that plugs the EGR valve, set EGR codes,

and/or cause raw fuel to enter the oil which destroys the engine. I

will add links to the right that have more information about the

problem, and detailed instructions on how to fix it. Look for

"92-95 4.3L Engine info", "4.3L Vortec CPI and Nut Kit

Replacement", and "4.3L Vortec Fuel Pressure Regulator


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