Question about 1989 GMC Suburban

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Timing will not adjust properly

I have a 1989 suburban with TBI The timing is severly retarted, and I cannot adjust it by turning thte distributer. I changed the timing chain, and it is still the same. I have been told I can place a jumper on a set of wires and put the ignition in a "performance" mode to bypass the computer controling the timing. Is this possible?

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Theres a plug to disconnect (ESC?) before setting it at dead 0...YES must stop computer from interferingmhile u set timing usually a brown wire with a white stripe near firewall under master brake cyl. set at dead ZERO.......if it still stayz totally retarded ya got ESC problems..... ifits too advanced and pings ...AFTER YA ZERO IT...then ya got knock sensor problem. or bad ground at ESC electronic spark control advances and retaRDS IGNITION TIMING for best performance

Posted on Feb 26, 2009

  • hix7 Feb 28, 2009

    i didnt notice how old this query was i guess someone already told ya this stuff...haynes manual 24064(420)chapter 6 section 6.4 theres a photo of connector at top of page also #6.4.......



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