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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.

2006-08-07 21:49:40
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Will vortec sensors work on a pre 1994 350 engine block?

No they will not.

Must you invert the motor when replaceing the intake gasket on a 4.3 vortec and will it throw a rod if you don't?

What? No!

Step by step instructions replacing head gasket on vortec 4.3?

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

Will a motor out of a 92 Chevy 1500 work in a 96 Chevy 2500 Both are 5.7 one is throttle body one is VORTEC?

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.

1998 Chevy Silverado coolant in engine?

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.

What is mechanic flat rate to replace intake gasket on 1997 Chevy blazer 4.3 vortec?

to replace the intake gasket would be about 4 hours labor. parts would run about $50

Where is the knock sensor located on a 95 Chevy blazer?

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.

What is causing white smoke to come out of a tailpipe on a 98 Chevrolet 5.7 vortec Is it possible that its an intake gasket leaking into the block?

Yes. White smoke is an indication of a coolant leak which could be caused by an intake gasket

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What do you do to take off water pump on a 1997 vortec 350?

here is a link to a how to thread that will have what you need.

97 gmc vortec 350 running slightly rough at idle it has 118000 on it and looks like it has never had anything done like cap and rotor or any sensors any recommendations on what I should do first?

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.

You put a 350 vortec out of a Tahoe in your 91 silverado and made it carb but it keeps dying why?

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,

Your Chevy 5.7 vortec 1997 is leaking coolantat the rear of the engine where is that coming from?

Heater return pipe or hose, leaking intake manafold gasket.

What are the symptoms of a Chevy 5.7 vortec intake gasket failure?

The water level drops, and you have to add to it every so often. If not, it will get hot, often, and easily.

Will a 1995 Chevrolet 350 computer control a 1997 350 vortec motor?

No it will not. Those 2 engines have a total different type of fuel system and sensors.

How do you remove an intake manifold on a 1999 350 vortec?

There is a complete how to article with good pictures on how to do this on helpwrench . com Here is the link

Where are the fuel injectors located on a 1994 GMC JIMMY Vortec Engine?

well, the 93 has a spider injection unit in the intake manifold. ten bolts and a gasket...

Does a 2002 astro van have a vortec 4.3 or non vortec 4.3?


Can you replace a 350 vortec with a 305 vortec in a 1996 silverado?

Yes you can. There are a few sensors that are different but after swapping them over it will run. The mounts and bolt pattern are the same. You will certainly be stepping back as far as performance and power goes. Not only does it obviously have fewer cubic inches but the heads lack the flow that the 350 vortec heads have, The 305 Vortec heads also do not have the famous Vortec heart shaped combustion chamber as the 350 heads. The 305 head also has smaller valves and smaller runners. You can also swap the other way and place a 350 vortec in where a 305 was. I have personally done these swaps with no troubles at all.

Do mounts need to be changed to swap a 5.3l vortec in for a 5.0l tbi?

should be the same mounts as they are both small blocks.

What would cause a Cylynder 5 misfire on a 2002 Tahoe?

Type your answer here... I had the same problem with my 96 Tahoe.. Vortec 350. Problem was a blown intake gasket.

Will a 89 350 bolt up to vortec heads?

Yes an 89 350 will bolt up to original Vortec heads. However, Vortec heads have an 8 bolt inatke manifold that is different from the standard 89' intake. Its worth mentioning that the intake manifolds changed in 1986. Prior to 1986 all intake manifolds for a sbc had 12 bolts. These 12 bolts all secured the intake to the head at the same angle. In 1986, or primarily in 1987 the intakes 4 center bolts were changed to a steeper angle. With the introduction of the vortec head came a new 8 bolt intake eliminating the 4 center bolts. If you plan to use Vortec heads on any V8 be it a 305,327,350 or bigger, you will need a Vortec intake manifold as well. You can also buy an after market intake to run a carburetor on a set of Vortec heads in place of the TBI injection.

What if timing does not change when rotating distributor on 5.7 vortec?

Short Answer: it is not supposed to change. The actual timing is determined by the ECM using input from several sensors including the CKP and the CMP.

What is the cause of the intake manifold head gasket blowing on an 1999' Chevy Suburban?

That is a common problem with the Vortec engines, First place the gasket is not made of much as you can see. Antifreeze eats the gasket up over time. The ORANGE antifreeze is BAD. If the Intake was OVER TORQUED that will cause it to leak/ Go bad too.

Will a vortex motor out of a 2002 blazer fit in a 1998 blazer?

The Vortec Motor hasn't changed sence it came out. it will fit perfectly.