Question about 1999 Chevrolet Silverado 1500

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I have a 96 chevy 2500 5.7 vortec with bad poppet valves, can i change to a throttle body intake from a 95. both are pre obd 2

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  • Lee Seliga Jan 04, 2011

    Please define poppet valve?

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You can't change the intakes on it. The 1995 throttle body and the efi that they used on the 96 up are totally differant. In 1996 when they went to the vortec motors they changed the heads. the 96 up only have 8 bolts to bolt the intake to the motor and are totally differant angles on the bolt holes. the 87-95 centerbolt head motors had 12 bolts to hold the intake down. Also the 96 should be odb 2 by government compliance. 95 was a split year but 96 up should be odb 2. If you do a search online you should be able to find the new injector or alot of time you can just get the poppets.Either way in the long run you will be better off fixing what is the rather than trying to convert.

Posted on Jan 05, 2011

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1 Answer

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hope this helps

Mar 04, 2015 | Cars & Trucks

1 Answer

Ok I am wondering if my motor in my 91 gmc 5.7 l b8 is a vortec or a 350 it has throttle body carb and not sure thought if I could interchange it with an older 350 ..


Here, is what I think you are asking. The TBI intake from a 91 will fit the same size engine from 88 to 95. The Vortec didn't come out till 96 I believe. So if your 91 is the original engine then it is not a Vortec motor. If you want to swap your 5.7 with another 5.7 (5.7 = 350) Then the 88-95 should work, Just double check your sensors and locations as the plugs may be different and or in different locations. I know my 88 GMC and my 94 chevy (both K1500's) were a little different. Hope this helps.

Jan 17, 2015 | 1991 GMC Sierra

2 Answers

I have a 1993 chevy blazer with the 4.3 vortec and when I start driving it looses power when I hit second gear starts jumping and acting like its gonna stall how do I fix this


if mtr is missfiring u may need 2 go through the ingnition system ie spark plugs leads/dizzy cap/rotorarm its also a good idear 2 replace the fuel & air filters or get it 2 a mechanic & have it run up on a tune scope.

Sep 10, 2011 | 1993 Chevrolet S-10 Blazer

1 Answer

I have a 1997 Chevy Tahoe 4 door V8 5.7 liter vortec. I replaced the fuel pump. I got good fuel pressure on the fuel rail up by the throttle body. It will start when I put fuel in the throttle body but it...


What is your fuel pressure with key on engine off? On these fuel systems if you do not have at least 52 psi or poppet valve inside the injector will not open allowing fuel thru.Let me know what it is i will try to help you.

Apr 16, 2011 | 1997 Chevrolet Tahoe

1 Answer

97 jimmy runs when you pour gas into throttle body, fuel pumps is putting out 55 to 56 psi. but will not pickup the gas from the injectors, fuel manifold psi is 55 to 56psi. 1997 4.3 vortec engine


If the 8th letter of the VIN # is W which i bet it is than your fuel pressure is to low.

This engine uses a CPI unit to deliver fuel to the cylinders. The CPI unit consists of a central injector that feeds fuel to the poppet valve that are right above the intake valves. The poppet valves require high fuel pressure in order to open and deliver fuel to the cylinders at start up.

The reason why it starts and runs if you add a little gas through the throttle body is that once the vehicle is running the intake is under vacuum. The poppets can open with less fuel pressure in a vacuum. This is a real common scenario with these style injection systems.

A new good quality fuel pump (a/c delco or delphi are good pumps) and your fuel pressure should be back into spec of 58 psi or more and the vehicle should fire right up. Make sure you replace the fuel filter when you replace the pump.

Oct 17, 2010 | 1997 GMC Jimmy

1 Answer

Truck runs for two seconds an shut down i changed fuel pump an filter and it still shuts down but it only stay running when i put gas down in the throttle body i had a 1996 chevy 1500 i was wondering can...


No, the fuel regulator from a 96 will not fit a 98. The 98 is a vortec and i believe the 96 is TBI. You are on the right track though, but the fuel regulator is attached to the fuel injector spider and is one unit inside the upper intake. It is relative easy to replace just takes some time.

May 07, 2010 | 1998 Chevrolet K1500

3 Answers

I own a 96 chevy k1500 5.7 l vortec and have a no 5 cyl misfire


It could be a faulty fuel injector, try running a fuel injector cleaner through your fuel system. At worst the poppet nozzle has gone bad and will need to be replaced, you can buy the poppet nozzle it self individually at Auto Zone or buy upgrade MFI system which is much better and less pron to fuel leaking room a cracked poppet line or nozzle which will cause what you have described.

Feb 03, 2010 | 1999 Chevrolet Silverado 1500

1 Answer

I have a 96 chevy blazer with a 4.3 vortec rough


Do a compression test on all of your cylinders when it is cold. Backfiring is a sign of a worn valve seat allowing mixed fuel and air (lit by spark) to be forced back into the intake. You will probably see compression loss on one or more cylinders.

Also... there is a chance that the EGR valve is not totally seated when the engine is cold with just a small blow by. The EGR valve seats coke up over time with black gunk.

Jan 28, 2010 | 1996 Chevrolet Blazer

3 Answers

Know if my 95 chevy blazer has a spider CPI?


A spider injector is located underneath the intake plenum and this is multi-port. Otherwise you have a throttle body injector system. Vortec engines have spider injectors and they are super expensive to replace ($400.00- 850.00) each ! There is only one spider injector for each engine it has 6 legs/fuel tubes that go to each cylinder.

Oct 10, 2009 | 1995 Chevrolet Blazer

1 Answer

95 Chevy C-1500 runs rough at idle and during accelleration. OBD-1 code 45. (rich exhaust)Runs ok at highway speed but gas milage seems worse. Replaced coil, cap, rotor, plugs, wires, fuel filter. BG-44K...


Check the vacuum line to the fuel pressure regulator and check to see if the fuel pressure regulator has gone bad. Give the throttle body a good cleaning and the injectors too. Do not use carb cleaner, it's to corrosive for the gaskets used in the throttle body. The other thing too that would cause this is a stuck or bad EGR valve, Try cleaning the EGR valve too since your cleaning the throttle body. Good luck and keep me posted.

Jun 11, 2009 | 1995 Chevrolet K1500

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