Timing check

[joshwilson3]

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[redvett]

You must disconnect the EST tan/black stripe wire by dist. to set timing. If you dont know how check your FSM for more information.

 

[93Rubie]

I dont have a 1989 FSM in front of me but I am willing to bet, you can only set base timing, so you need to disconnect the mentioned connector to check and set base timing only. All other timing should be controlled by the Ignition Control Module.

 

[Hib Halverson]

You must disconnect the "timing connector" when you check the timing with a timing light or the reading will be way off. Pulling that wire disables EST and leaves the engine at base timing. After you pull the timing connector, then use your light. If the timing mark on the balancer doesn't line up with the index, loosen them move the distributor to get the timing to the specification on the emissions sticker or in the FSM.

Shut of the engine, reconnect the timing wire then turn the key on with engine off and clear codes. Restart the engine and you're good to go.

 

[Schrade]

It seems to run fine. Do you think it could be the harmonic balancer has spun? I did notice the timing mark seemed to move back and forth some.

I think the crank has a device called a woodruff key, which prevents that.

Yes, it was moving tho', about 700+/- times / minute with variation...

 

[JAKE]

The stock balancer/damper is actually two pieces joined together by what GM refers to a elastomer. It's like a rubber and over time the rubber hardens, cracks and separates. When that happens the outer portion will move independent of the inner portion which is attached to the crank. It's a fairly common problem for them to fail, especially with older/high mileage engines.

Main reason why so many (if not all) racing sanctioning bodies now require an SFI approved damper/balancer is the outer portions have repeatedly failed, sending it flying off onto the track or into the crowd. I don't recall what ET is the cut-off, below which an SFI approved damper is required equipment.

One way most guys find they have a problem is when they check their ignition timing and find the marks no longer align as they had previously. Catch it in time and you'll be good-to-go; if not, your car will probably suffer lots of damage.

Jake

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