Also keep this in mind when setting the 4.3 if its the vortec
Set timing under the following conditions:
* Normal operating temperature.
* Air cleaner installed.
* A/C "OFF."
* Transmission in neutral.
* Disconnect SET TIMING connector.
The location of the set timing connector is inside the cab where the heater box and the carpet meet on the passenger side floor. Pull carpet back to expose the single wire and connectors on the outside of the control module harness. The wire colors are tan with a black stripe. DO NOT disconnect 4 wire connector at distributor. (connector is sometimes found hanging right in front of the blower motor)
Connect timing light and adjust as necessary by loosening hold down bolt and rotating distributor. Tighten hold down and recheck the timing. Stop the engine and connect SET TIMING connector. Clear control module trouble code by disconnecting control module power source. With engine at operating temperature, drive vehicle at part throttle with moderate acceleration and decelerate to idle condition. This will "teach" the control module and return the engine to normal performance.
I assume your trying to locate your timing marks. On the Bottom Pully on your Engine where your Belt or Belts run, Behind where the Pully is Mounted to is your Harmonica Balancer ,On that Harmonic Balancer you'll find your Timing Marks,Clean it all the way around it with a Degreaser wipe it off rotate your engine a bit at a time and line up your timing marks with the Pointer which you'll also see ,It just looks like a half Triangle or a Round Pin. Pointing towards your Timing Marks. TDC =Top Dead Center.
on the timing plate there are 3 notches all the marks are gone whitch notch is tdc ?? also on the damper there are 2 marks 1 large 1 small whitch one do you use for tining
the center one is TDC, the other 2 are 5 degrees either way , + or - , Mine just has one line,, so lemme check on the bottom balancer one for you
Thanks for the info " I certainly appreciate it.
ok,, heres the info I got from a mechanic in the Chevy vortec forum, basically,, the 2 lines on the balancer are for when you hook up the timing light, ( after setting the timing, the second mark will show you the advance when the rpm's are increased, which makes sense to me,, anyway , here are the details he sent me,
line up the two timing marks on the balancer with the the tabs on the timing cover... then, on the inside of the distributor housing, on the passenger side, there is a little arrow with the #6 stamped on it partruding inward... line the rotor button up with that... now your timing should be correct and the computer will take care of the little bit of adjustment. (even though #1 cylinder is on the driverside, it fires on the passenger side right next to #6 cylinder, if you look on the cap the #1 point travels over to that side). follow those steps, and you know your distributor will be set right... if problem still exists i would assume something internally is off, like the timing chain or the balancer spun.
Hope that gets ya up and running!!
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