my trucjk failed the smog ck,,it says"Failed ignition timing"..how expensive is this to correct or do i need to have a certified mechanic to fix it/..plz help me with the answer..thankyou
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1994 Toyota 4Runner Question: failed smog
Answer #1Bret Bodas from RepairPal Test Shop, December 21, 2009, 11:04Master
There is an adjustment for the ignition timing, and if this not within the specification noted by the manufacturer, you will fail the smog check. On the 3.0L V6 (3VZ-FE engine) the specification is 10 degrees BTDC. If you look on the printout, it should note the actual reading they measured.
You are best taking this to a shop that is a licensed smog test and repair shop.