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Posted on Jan 02, 2017
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.
Posted on Feb 19, 2009
SOURCE: 1989 Chevy 1 ton wont start
It is likely the electronic ignition control module. When they go, they just go bad and usually when you are driving.
If it was a smaller vehicle it could also be a timing belt but your's has a heavy duty valve train so no worries there.
Posted on Mar 17, 2010
You have a 1986 454 engine with an old style breaker point ignition distributor, GM has not used a breaker point ignition for their V-8 engines since 1974, is that an older distributor or something after-market?
The ignition points dwell angle for that engine should be set at 29-31 degrees dwell (a dwell meter would be the most accurate way to set the ignition points), or a .019 in. point gap.
The spark plug gap for that engine would be .035 in. and the timing should be set at 10 degrees before top dead center.
Posted on Jun 29, 2010
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