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Were do.I find the factory marks on my distributor and intake to stab it right, .on my 93 chevy 5.7

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I don't know of any factory marks. You have to put the #1 cylinder at TDC of the compression stroke, then drop in the dist. so the rotor points to the #1 spark plug tower on the dist. cap. The rotor will turn slightly as the dist. shaft slides down, so you need to start the dist. with the rotor turned slightly back. When it drops down, the rotor will be pointing directly to the #1 plug wire tower. Repeat until you have it right. Then it will start, and after warmed up, set the timing with a timing light.

TDC (Top Dead Center) of compression stroke: there are two TDC's for each cylinder, the compression TDC, and the exhaust TDC. To find the compression stroke, pull out the #1 spark plug. With your finger over the plug hole to feel pressure, turn the crankshaft over clockwise with a ratchet and socket on the crankshaft pulley. As the piston rises on compression stroke, you will feel pressure on your finger (there is no pressure build-up on the exhaust stroke). As soon as you feel pressure, now just turn the crankshaft further till the piston is at TDC. You can use a straw or pencil in the hole to find the top, or just look at the pointer scale by the crank pulley. The mark or notch on the pulley will be at 0 degrees on the pointer scale, TDC of compression stroke-now drop in the distributor.

Posted on Apr 08, 2015


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SOURCE: Need timing marks for 93 chevy 454

Under the hood on the emissions decal should say what degre the timing should be set at. ther is a one wire plug that is brown with a black stripe u need to un plug befor seting the timing with a timing light . u can usually find that under the glove box or behind wher the fuel pump relay is . i think the timing is set at 4 degres on the timing pointer but look for the decal first too make sure im right.

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Your issue requires a lot of info to be able to solve it. If you do not have a repair manual for the vehicle then you should try to obtain one. The manual (Chilton or Haynes preferred) will have detailed info to make the correct adjustments.

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SOURCE: in replacing intake gaskets I marked firewall with distributor direction then it rained washing mark away I reinstalled distributor but I'm getting popping and back firing the injection unit , alo

sounds like u advance the distibutor

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