Question about 2000 Chevrolet Blazer

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1999 chevy 4.3 timing issue

Ok there two timing marks on the harmonic ballancer the number on cylinder plug out it blows on the the first and through the second mark distributer yes i know how to set it it will not crank on the first mark i set it on the second mark it started.

i drove it it was good second day i drove it check engine light came on and bad slow acceleration if the first mark is the timing mark how do you get it to zero there what is this timing advance wire i have read about is there one on a 99 if so where it is retarded 17 degrees and the computer takes over but still runs slow and some slight chatter valves so timing is definately off ot could the throttle body sensors be bad

confirm first mark or second mark or can it go in between the two and set cap to 6

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On all 1993 and later GM 4.3L engines the timing mark is on the plastic timing chain cover.(a small notch) it's about in the 1 oclock position above the balancer. If your balancer has 2 marks.. from the clockwise rotation, ignor the first mark. TDC "top dead center" is the second mark on the balancer. Just remember. All 4 stroke engines, the crank turns twice the RPM as the cam/distributor. The distributor could still be 180 off if TDC is not determind on the compression stroke of # 1 cylinder.

Posted on Jan 18, 2013

  • Mick Jan 18, 2013

    on all 1993 and later GM 4.3L engines the timing mark is on the plastic timing chain cover.(a small notch) it's about in the 1 oclock position above the balancer. If your balancer has 2 marks.. from the clockwise rotation, ignor the first mark. TDC "top dead center" is the second mark on the balancer. Just remember. All 4 stroke engines, the crank turns twice the RPM as the cam/distributor. The distributor could still be 180 off if TDC is not determind on the compression stroke of # 1 cylinder.

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I have a 1999 blazer 4.3 2wd i have top dead center up and the mark on the balancer lined up to the cover. Ignition rotor pointed to #6 on the cap. But it still seems like its out?

Posted on Sep 04, 2010

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