We are trying to set the timing on a 1987scotsdale and for some reason steeing it top dead and plugs and everything are acurate i am getting a screwy timing bounces around and i can't catch it... i pulled the distributer and tried reseting everything. is there a sensor or something i need to jump?
You need to put the computer in "limp mode" You do this by unplugging the timing connector on the firewall. It is Tan with a Black stripe. The bouncing is the computer controlling the timing and with it disabled, you can set base timing. Don't forget to plug it back in when you're done. Paul.
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remove sparkplug one and insert a tdc whistle when the piston reaches top dead center the whistle will quit. the timing mark on balance will be on the scale at zero and the two rocker arms on the valves for cylinder one will be both loose
set timing on1987 dodge ramcharger 8 degrees BTDC (Before Top Dead Center) ..Each spark plug must fire 8 degrees before each piston reaches TDC (Top Dead Center).. This only holds true when the engine is at idle speed.. I hope this helps you set your timing.....
The timing should be set at 6 degrees before top dead center only for California emission equipped vehicles, and unless the engine code was "CCC" (check the emission label if the vehicle still has one) or had federal emissions then the ignition timing should be set at 8 degrees before top dead center. and 10 degrees before top dead center for high altitude vehicles.
The #1 cylinder is located at the front spark plug on the driver side, and here is a firing order diagram top help assist you.
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.
6 Degrees Application: With automatic transmission
Note : Before top dead center *Set at warm idle speed (900 RPM) *Disconnect & plug vacuum hose at electronic spark control computer *Transmission in neutral (parking brake engaged) *All accessories off
and with a timing light loosen the dizzy or distributor and turn it till it runs smooth or at 6 degrees
i will assume it has a 305 or a 350,i run my timing at 4 degrees btc and being fuel injected youll have to unhook your distributor bypass it is a single wire located behind distributor taped to harness it has a plug similar to your o2 sensor plug
the relay is normally in the wiper motor itself go to a salvage yard and if you change it test it with the plugs before putting back together because if there is no change the problem could be in the switch