Bosch Platinim +4 after 101k miles

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quote:

what's "reverse firing"?

Its a term used when referring to DIS ignition systems. Half the plugs get fired in reverse. This is why you want a double platinum plug that has platinum on the side AND the center electrode. If you use regular platinum plugs that only have a platinum on the center electrode then half the plugs will wear out faster.
 
quote:

Originally posted by kenw:
what's "reverse firing"?

also know as a waste spark or dump spark. Newer Jeeps have this same feature, and same problem with single tip platinum plugs.
A little more explanation is that you have 1 coil for 2 plugs, and the coil fires both plugs at the same time, one on compression cycle and ignights the fuel, one on exhaust (so no fuel to burn in cylinder)
 
quote:

Originally posted by Whimsey:
How does the spark know which electrode to go to?
dunno.gif
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Whimsey


The electrode with the least resistance will fire first,Im sure the resistance will change during firing.
 
since the camry these plugs came from (3.0L v6, 1997) has 1 coil servicing 2 plugs, I would guess that makes it "waste spark" by Tom's and blupupher's definitions. The coil packs are mounted on the front bank and the secondary plug wire feeds the 3 backside plugs.

thanx for the help.
 
quote:

Originally posted by 1maniac:

quote:

what's "reverse firing"?

Its a term used when referring to DIS ignition systems. Half the plugs get fired in reverse. This is why you want a double platinum plug that has platinum on the side AND the center electrode. If you use regular platinum plugs that only have a platinum on the center electrode then half the plugs will wear out faster.


lol.gif
 
quote:

Originally posted by blupupher:

quote:

Originally posted by kenw:
what's "reverse firing"?

A little more explanation is that you have 1 coil for 2 plugs, and the coil fires both plugs at the same time, one on compression cycle and ignights the fuel, one on exhaust (so no fuel to burn in cylinder)


No, the above explanation is "how it works." The "explanation" I was laughing at makes no sense.
 
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