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1999 1t vortec no spark 454 - 1999 Chevrolet C/K 2500

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I have a 3500 silverado 454 vortec wont start when i let off the key it wants to start

Sounds like there may be a ballast resistor/resistor somewhere in the ignition circuitry that could possibly cause your problem. This is only a thought. Wire resistors come in 12ga also.

Nov 13, 2014 | Cars & Trucks

1 Answer

Spark plug firing order

firing order is 1342 . number one is stamped on the distributer cap.

Aug 11, 2014 | 1999 GMC Suburban

1 Answer

Lost compression and now there is a loud knocking noise in my 454 vortec engine

Bent valves would be number one cause. Check the timing. If you lost time, your valves are tapping the pistons causing the knock. When the valves tap the pistons they bend and don't close all the way, so the cylinders cant make compression.

Oct 17, 2012 | Chevrolet Chevy Cars & Trucks

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Want to know if I can remove the 454 and downsize to 4.3 liter v6 vortec

You probably could, but his has to be at least a 3/4 ton Suburban to have the 454. It would take a ton of work and fabrication including things like fabricating motor mount, an adapter for the transmission (possibly), and you would have to change the computers as well since you are going from a V8 to a V6. It would take a lot of time and money, but I am sure it can be done.
Hope this helps. Good luck!

Apr 09, 2011 | 1994 GMC Suburban

1 Answer

Does a 1996front pully bracket assembly fit on a 1972 454?if it does i need a diagram how its set up.thanks for ur advice.aloha

Hi, the aluminum drive brackets from a vortec small block will not fit a big block, especially an older one, due to hole location, bracket shape and size.

Sep 26, 2010 | Chevrolet C2500 Cars & Trucks

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My 1996 Gmc K2500 with a 7.4l is miss firing. runs good till it warms up, then the problem starts. I have no codes in the computer. new fuel filter, spark plugs, air filter

Very good chance that it's bad fuel injectors and/or fuel pressure regulator. Very common with the 96-2000 L29 motor (Vortec 7.4L)
Replace with better injectors, the OEM ones are NOT WORTH cleaning. Go to
for more info...

Sep 05, 2009 | 1996 GMC Jimmy

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