fredster102

I just pulled my trailing wires off my car while it was running , it made NO difference , is this bad?

black_88

just one thing. why did you do this?

fredster102

Because my car WILL NOT IDLE or start good lol

NZConvertible

The trailing plugs contribute very little, they just clean up the tail end of the mixture to improve economy and emissions. You shouldn't notice if they're not working.

Next time try to put more than one word in the title...

fredster102

lol i will , so they would not contribute to my SHITTY idle?

No_Rotor_RX7

no, i don't run trailing ignition at all and i have no issues.

Aaron Cake

iTrader: (1)

Crappy idles and hard starting is generally due to a car thats in poor tune. Or could be the standard TPS/vacuum leak issue.

ziplock

If your trailing isnt firing. your tach will not work. Thats quite noticable IMO. As well you will destroy your cats (if you have any) and have a drastic loss in power.

NZConvertible

RotaMan99

With my old engine I noticed a good loss in power without the trailing connected.

ziplock

Trailing coils not firing will cause huge amounts of unburned fuel to go in your cats. Cats will heat up and get blocked, thus destroying them. Your rotors are also only being pushed around by one set of plugs as opposed to two sets.
Use ur noggin.

papiogxl

iTrader: (6)

You do realize that we utilize wasted spark on the leadings, right? This means the leading will fire twice per cycle, once early, once late. So while it is only one plug it is firing twice- this means only 1/3 of the spark is there, not 1/2. But, then there is the fact that the trailing spark plug is set back from the chamber and not exposed much at all.

Use the search button.

NZConvertible

Go back and read post #4. It's a simple fact that the bulk of the mixture is ignited by the leading plug. I "used my noggin" a long time ago to learn how Mazda's design actually works.

You're getting all mixed up. The wasted spark system has nothing to with the leading/trailing set-up. The trailing plugs are fired ~5deg after the leading plugs, but the second "wasted" spark (on the leading only) occurs late in the exhaust stroke and has no effect at all on combustion. The only reason for wasted spark is to simplify the ignition system by allowing two plugs to operate from one ECU driver and coil.