Question about 1990 Chevrolet C1500

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1990 chevy 350 distributor wiring diagram and firing order

Engine runs rough after plug wires were replaced

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The firing order is 1-8-4-3-6-5-7-2.
The distributor rotates in a clockwise direction. The engine must be on the compression stroke on the #1 cylinder. Line up the timing marks. Remove the cap and the rotor should be pointing to approximately the 5 o'clock position.

Good Luck

Posted on Mar 06, 2009

  • graywolf Jul 17, 2013

    thank you your info was very helpful but i dont know the cyclinder sequence to run the plug wires to the right cyclinder when i get it on number 1 at top dead center that all i lack i think


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I tried to do this firing order with the rotor at 5 o'clock it didnt work it wouldnt start and just blew like air through my throttle body on my 1990 chevy with 5.7 350

Posted on May 11, 2010

  • Glen Stein
    Glen Stein Feb 26, 2013

    hey bud....I'm a licenced auto tech, pull your number 1 spark plug out, get a 5/8th socket, on a ratchet with an extension. Have someone plug the spark plug hole with their finger. Turn the engine over with the socket onto the front crankshaft pulley bolt, it's inside the lower crank pulley. turn the engine over clockwise, this way it won't loosen your crank bolt keep turning till your partner feels compressed air starting to push against their finger, as you feel the compression pushing on your finger, watch the timing mark, and when it reaches 0 degrees stop. Now you're on top dead center, firing on number one cylinder. Place your distributor back in, you'll have to move the shaft a bit to get the cam gear to engage. It may take a try or two to get it at approx the 5 o clock position. Once you have it down and in and your rotor is facing the 5 0 clock position, set your cap on and scratch on the cap where your rotor is pointing. The tang inside the cap facing the tip of the rotor is now your number 1 firing. when you've done this, then just run your wires to your plugs. firing order is 18436572, so after number 1 is on, going in the direction of rotor rotation , next place #8 wire on, then #4 etc. You'll have to fine tune the distributor for exact timing after you have it running.


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Look at cap see what wire terminal upoint at thats #one on cap going clockwize,tothe left isfierining order!

Posted on Feb 21, 2013

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