An air leak at the head can cause reving at idle. When you changed the spark plugs what did the old ones look like A light gray or white color would indicate a lean condition. This could be a head gasket or a leak in the intake between the injection system and the intake valve.
No they will not.
There is a great write up with step by step instructions here for the 4.3 5.0 5.7 vortec Engines. Also lots of tips in thread.4.3 5.0 5.7 Vortec Intake gasket replacement guide pictures directions and picsSee link below
No it will not. The 96 vortec has a crankshaft sensor and alot of other sensors on the engine that is required so the transmission will work that will not interchange with the 92 engine. Even the fuel pump would have to be changed. You must put a VORTEC engine back in the 96 so everything will work correctly.
What? No!
If you are sure that it did not freeze and crack the block, Then the intake manifold gasket is leaking. That is a common problem with the vortec Chevy engines. You need to replace the gasket with a factory Chevy gasket from the dealer.
to replace the intake gasket would be about 4 hours labor. parts would run about $50
There are a total of 4 O2 sensors 1 on the left AND right exhaust manifold 1 before the catalytic converter and 1 after it.
The knock sensors yes there are two are located on either side of the motor (4.3LTR Vortec) below the heads in the center area of the engine block. There are a place for another sensor just above where the knock sensor goes but these are for other sensors. The knock sensors yes there are two are located on either side of the motor (4.3LTR Vortec) below the heads in the center area of the engine block. There are a place for another sensor just above where the knock sensor goes but these are for other sensors.
Yes. White smoke is an indication of a coolant leak which could be caused by an intake gasket
Cap, rotor, wires and plugs, and if they've never been changed, probably the Oxygen sensors as well. Check the EGR valve, make sure it's opening properly and hasn't caked over with deposits. Get a new gasket before you remove the EGR valve. A PCV valve would probably be a good idea. Of course, make sure all of the filters are in okay.
here is a link to a how to thread that will have what you need. http://helpwrench.com/forums/showthread.php?6-4.3-5.0-5.7-Vortec-Intake-gasket-replacement-guide-pictures-directions-and-pic
Because a true 350 vortec I think relies on the vortec intake in order for the pressure to stay correct. I just remember i had my vortec box off of my truck one time I started it and It died just put the old vortec air intake back on and it should be fine. sounds like you have vacumn leaks around the intake manifold, this can be checked with a can of carb spray,