Question about 1996 Chevrolet K1500

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96 Chevy Z71 with Vortec 350, Code 1406. When engine gets up to temp. code comes on and left bank exhaust gets loud and engine has a variable rough Idle. Suspect EGR Valve Sticking?

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Yep that is what the code is for. Make sure the passage is clean after you pull it off.

Posted on Oct 16, 2009

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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.

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That's a lot of miles! Get the oxygen sensor checked, I'm wondering if its going south and leaning out the mixture too much. I think you need a good tech to go through the sensors that control mixture. Inlet air temp, water temp, CO, exhaust temp etc.

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Wiring diagram for a 1997 Chevy Z71 Vortec 350


i have a 1997 chevy Z71 and it will not start. all my fuses are working and so is my fuel pump. When i turn the key on none of my guage lights come on and when i crank it all it does is keep turning over, never starting

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The computer runs the Transmission from the signals the throttle position sensor, crank shaft sensor, and cam shaft sensor. Your going to have to replace the transmission with an older transmission like the turbo 350 or turbo 400. When it's time to get the car e-tested, that's when your going to run in to problems, due to the year your Chevy is. If your Chevy was a 1985 then you could go with the carb system but with being the newer OBD11 system, your going to have an off road only vehicle with that swap. Why would you want to replace the engine with the 350 carb set up??? There are things you can do to tweak the one in your Chevy free of charge.

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1 Answer

Turns over but dont start let off key and sputters 3or4 times 1998 Vortec 350 Chevy Z71 4x4


The freeze plug you replaced was due to rust or was it pushed out by freezing temperature? These plugs are not designed to protect the engine block from cracking during freezing temperatures, they are there to remove the sand from the block after casting it. I would drain your system completely and flush out the radiator thouroughly and fill with plain water, then run the engine and see if oil gets in the water, if it does and the plug was out due to freeze, then your block is probably cracked, although you could just have a head gasket leak. Oil pressure (40psi) is higher then water pressure (17psi), so getting oil in the water is always more prominent than the other way around. Flush out the system and let me know if oil returns to the water, hope this helps

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Oil in the water (radiator) 1996 Vortec 350 Chevy Z71 4x4


i would try to flush the cooling system completely
if I had to guess someone put stop leak in it when the freeze plug started leaking
also check the oil to make sure there is no water in the oil

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