Question about 1991 Pontiac Firebird

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All that was done (entry to left), well under

All that was done (entry to left) well under power the Formula is no good. Timing was set per lable under hood and looked good on the road no power had to set timing approx 20 degrees prior to tdc to get power now I suspect gas will wash doen cylinders and cause other problems. Timing Chain off a bit? Possible cam wore?

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Correct on both your guesses. check your firing order making sure that #1 is in the correct place on the cap

Posted on May 09, 2010


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    All that was done (entry to left), well under power, the Formula is no good. Timing was set per lable under hood and looked good, on the road no power, had to set timing approx 20 degrees prior to TDC to...

    the sound of what you explained is more that the timing is 180 degrees out... that would explain the no power on the road.... it would also allow the timing marks to line up.... hope this helps

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    Where can i get the specs for ignition timing on a 1989 GMC K1500 Pickup

    Note: The Timing Connector breaks out of the engine wiring harness conduit adjacent to the distributer. It is a single wire sealed connector that has a tan with black stripe lead.
    Note: Timing specifications are listed on the Vehicle Emissions Control Information label under the hood. Always follow the Vehicle Emissions Control Information label procedures first before using the following procedure. PROCEDURE:
    Set timing under the following conditions:
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    • Air cleaner installed.
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    • Disconnect SET TIMING connector (tan/black wire) located in the harness close to the distributor. DO NOT disconnect the 4 wire connector at the distributor.
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    Base Timing, with Manual and Automatic Transmissions: 00(TDC)
    • Tighten hold down and recheck the timing.
    • Stop the engine and connect SET TIMING connector.
    • Clear ECM trouble code by disconnecting ECM power source.
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    Nov 24, 2009 | 1989 GMC K1500

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    I'm not a Lexus pro but having done car stereo installs, common places are under the seats front or rear, or in the trunk well somewhere. May also be in the dash behind the deck.

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