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Old 01-14-2003, 05:05 PM   #1
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what's the difference

i've got a 95 S-10 with a 4.3 vortec. What's the difference between it and a 96 and later engine. I've found all kings of stuff for the later ones but I'm gettin left in there dust.
Old 01-14-2003, 08:05 PM   #2
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pre 95 4.3 are TBIand CPI and 96 and newer different they are called something else. The TRUE Vortec didn't come out in the truck intill 96.
Old 01-14-2003, 08:28 PM   #3
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Go to this website, they should have almost everything you could want for your truck.

www.truckperformance.com
Old 01-15-2003, 08:29 AM   #4
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The 95's are central port injection(cpi).And the 96's are central sequential port injection(cspi).It's allways been to my understanding that the cpi was the more powerful of the two.A friend of mine,who I carpool to work with,has a 94 2door Blazer w/cpi.And allthough I've never raced him,I think he could beat my 96 Jimmy w/cspi.He can smoke the tire with just the gas pedal,while my Jimmy barely turns them over.
Old 01-15-2003, 06:59 PM   #5
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Quote:
Originally posted by zq8jeff
The 95's are central port injection(cpi).And the 96's are central sequential port injection(cspi).It's allways been to my understanding that the cpi was the more powerful of the two.(


1st: All 95 are not CPI's
2nd: Yes CPI is better the TBI but I dont know about the 96 up.

My friend at school had a 95 S-10 5 speed and it was TBI.
Old 01-15-2003, 07:23 PM   #6
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which has more torque? my 95 tbi has wayyyy more snap than my moms 93 bravada with cpi. maybe its cuz of mileage, but i dont think that motor has nearly as much power as mine
Old 01-15-2003, 08:46 PM   #7
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I pulled this off the s-series.org web site.


VIN Z: LB4
Throttle Body Injection (TBI). Manufactured from 1988-1995. Was the first 4.3 used in the S-series. Manifold setup is similar to a carberated engine. The TBI unit looks like an electronically regulated carberator and the air filter sits directly on top of it.
155 to 165 hp, 235ft/lbs



NOTE:The 4.3L in the Syclones/Typhoons is also VIN Z, LB4. This turbo charged engine has an intercooler and a unique air intake assembly.
280hp, 350ft/lbs in 1991-1992.
290hp, 360ft/lbs in 1993 Typhoons.



VIN W: L35
Central Port Injection (CPI). Manufactured from 1992-1995. This was first Vortec engine in Chevrolet’s S-series line up. It has 1 injector with a regulator and 6 poppet nozzels, one for each cylinder. The manifold looks much like that of an LT1, the throttle body is at the front of the manifold and goes to an intake tube with a filter box behind the left headlight. Vortec is written in orange on top of the plenum, which is black or aluminum colored.
190 to 195hp, 260ft/lbs



VIN X: LF6
Central Sequential Fuel Injection (CSFI), Sequential Fuel Injection (SFI), Central Multi-port Injection (CMPI). Manufactured from 1996 to 1999. It has 1 injector with a regulator and 6 poppet nozzels, one for each cylinder. Manifold setup is similar to TBI, except it has one bore and one throttle blade. Air filter box is located behind driver’s side headlight.
175hp, 240ft/lbs (2wd pickups), 180hp, 245ft/lbs (4x4 pickups)



VIN W: L35
Central Sequential Fuel Injection (CSFI), Sequential Fuel Injection (SFI), Central Multi-port Injection (CMPI). Manufactured from 1996 to present. It has 1 injector with a regulator and 6 poppet nozzels, one for each cylinder. Manifold setup is similar to TBI, except it has one bore and one throttle blade. Air filter box is located behind driver’s side headlight.
180hp, 245ft/lbs (2wd pickups), 190hp, 250ft/lbs (Blazers and 4x4s)


NOTE: From engines manufactured from 1996 to present, OBDII was standard. In 1995, the old VIN W, Vortec CPI engine was discontinued and replaced in 1996 with 2 new Vortec engines, the VIN X, CSFI and the VIN W, CSFI. The 1996 to 1999 VIN W and VIN X appear a like. The only likely difference is computer programming. The VIN X engine was discontinued in 1999 or 2000.
Old 01-15-2003, 09:13 PM   #8
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Quote:
Originally posted by noSS
I pulled this off the s-series.org web site.


VIN Z: LB4
Throttle Body Injection (TBI). Manufactured from 1988-1995. Was the first 4.3 used in the S-series. Manifold setup is similar to a carberated engine. The TBI unit looks like an electronically regulated carberator and the air filter sits directly on top of it.
155 to 165 hp, 235ft/lbs



NOTE:The 4.3L in the Syclones/Typhoons is also VIN Z, LB4. This turbo charged engine has an intercooler and a unique air intake assembly.
280hp, 350ft/lbs in 1991-1992.
290hp, 360ft/lbs in 1993 Typhoons.



VIN W: L35
Central Port Injection (CPI). Manufactured from 1992-1995. This was first Vortec engine in Chevrolet’s S-series line up. It has 1 injector with a regulator and 6 poppet nozzels, one for each cylinder. The manifold looks much like that of an LT1, the throttle body is at the front of the manifold and goes to an intake tube with a filter box behind the left headlight. Vortec is written in orange on top of the plenum, which is black or aluminum colored.
190 to 195hp, 260ft/lbs



VIN X: LF6
Central Sequential Fuel Injection (CSFI), Sequential Fuel Injection (SFI), Central Multi-port Injection (CMPI). Manufactured from 1996 to 1999. It has 1 injector with a regulator and 6 poppet nozzels, one for each cylinder. Manifold setup is similar to TBI, except it has one bore and one throttle blade. Air filter box is located behind driver’s side headlight.
175hp, 240ft/lbs (2wd pickups), 180hp, 245ft/lbs (4x4 pickups)



VIN W: L35
Central Sequential Fuel Injection (CSFI), Sequential Fuel Injection (SFI), Central Multi-port Injection (CMPI). Manufactured from 1996 to present. It has 1 injector with a regulator and 6 poppet nozzels, one for each cylinder. Manifold setup is similar to TBI, except it has one bore and one throttle blade. Air filter box is located behind driver’s side headlight.
180hp, 245ft/lbs (2wd pickups), 190hp, 250ft/lbs (Blazers and 4x4s)


NOTE: From engines manufactured from 1996 to present, OBDII was standard. In 1995, the old VIN W, Vortec CPI engine was discontinued and replaced in 1996 with 2 new Vortec engines, the VIN X, CSFI and the VIN W, CSFI. The 1996 to 1999 VIN W and VIN X appear a like. The only likely difference is computer programming. The VIN X engine was discontinued in 1999 or 2000.



Does the newer W engine ( 96 Blazer ) have the same regulator leaking problem? The reason I am asking is because my blazer is hard to start and smells rich and has virtually every other symptom the older cpi engines have. If so How do I diagnose and what do I need to replace?
Old 01-16-2003, 10:42 AM   #9
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You have six injectors instead of my one, but yes you could still have a leaking regulator even though it's different than the one on the older CPIs. Check your fuel pressure for leakdown with key on/engine off. Check for stuck open poppets.
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