Having problems with your 2002 Mercury Sable ?

Po302 po303 po316 code

\015 Replaced plugs and helped for awhile change plug wire no change . sometimes runs fine idles ok till i hit brake vacum at 20+. timing seems to be alittle high at times 45 at higher rev light load, 13 or so at idle\015 Posted / edited by AnonymousUser on : 25-05-2020

Answers :

The Codes 302 & 303 are cylinder misfire codes,google them

Spark Plugs have nothing to do with misfires,it would be rare in
a life time if one ever failed to fire

Forget the 316 just misfires on start up

A repair shop would be your best choice without knowledge,
reference material & test equip

Ignition coil or vacuum leak problem
Repair Help & Product Troubleshooting for 2002 Mercury Sable

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