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Old 03-11-2011, 12:16 PM
CF Beginner
Join Date: Jul 2009
Posts: 3
Default 98 tahoe timing question

I have an 98 tahoe with a 5.7 i was wondering how to set the timing. i have read on here to use a scan tool. so i got a bluepoint YA3140 scan tool. heres so of the live readiings map 9.1 ,eng rpm 650, spark adv 22, maf .808 . no matter where i move the dist. the spark adv. stays between 22 - 24. i have read it should be 0 +/- 2. it runs ok but starts hard some times. any help would be greatly appreciated.
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Old 03-11-2011, 06:07 PM
MDTAHOE's Avatar
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Join Date: Nov 2008
Location: Bowie, MD
Posts: 2,955

Spark advance is not the correct item. You need to look for "cam retard" . Also after each turn of the dis you must snap the throttle above 2000 rpm to update the reading.
ASE Master Tech, L1 Advance Engine Performance certified
I will not answer repair questions by PM, if you would like my input you can PM me and ask me to reply to your public thread.
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