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strange pinging

256 views 0 replies 0 participants last post by  sas87yj 
G
#1 ·
yeah the engine has been pinging lately when i put a load on it. i figured a low octane fuel or timing or both. i burn high octane anyway. i retarded the spark a little. doesn't ping as much and i don't let it. i will keep rpm high enough and don't lug. hre's the weird thing- going down the road say in 4th gear, flat ground, doing 60, it let out about 3 loud pings and then an exhaust smell. it did this once last weekend and then once today after re-timing. i ran a 10 hour trip today and it ran great- 8 hours in 4WD! it let out these rather loud pings when shifting from 3rd to 4th under a good 2500 rpm- wasn't lugging. oh well i was just wondering if it could be the computer.

 
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