(10-19-2016, 11:41 AM)Sandro-it Wrote: Mine did the opposite: when cold perfect running , after warming up one cylinder was stop working only at low rpm and return ok over 2500 rpm, all of this was caused by defective second cylinder spark plug cable !
the cables never last the live of any engine, made. the are a 60k service point,
Still I can not explain why the cable was ok cold and stop working hot.. (best is not to worry why bad wires are bad but..)
if fails from a process called Entropy. (as in all things do)
sure easy, the stock cables are cheap junk carbon string and low cost insulation. (buy Bosch or NGK mag wire, and go farther, and longer) no kidding.
the carbon core (string) goes bad easy, it gets loose and fractures, and then fails. they all do that. it's cheap wire, (bottom of barrel). after all, and does that,
mag wire don't do that. (not only that, with upscale mag wires the insulation is far better, (read the spec sheets at Bosch or NGK for what and why.)
also most materials expand hot, and that can cause a defect in anything, to get better or worse, depends on the shape ,character and qualities of said defect. (with carbon lots of ways)
Not only that the wire shakes all the time (4 banger do shake a lot), think how carbon likes being beat to death every day, (yes,a hopeless case).
The generation of suzuki does have weak spark to start, its not HEI, yet, that happened in 1999. high energy ignition is not here, that is why the spark gaps are so small. (the some forget to set, too and have bad spark)
cheers and good luck.
The purpose of the wire are 2 fold.
1: capture and deliver the high voltage to the spark plug, for a strong spark. That takes good wire, and good insulation, 2 things.
2: cut radio noise , called RFI. (radio freq. interference) this is the resistance quality. ohms per foot or inductance per/foot if MAG wire.
Greetings
hope helps.
but there are over 50 reasons for misfire. lacking a full 60k mile tuneup is just 1 of them.
the vast ways to misfire. in text... just to show it's not simple. (it is in physics, bad engine, bad spark bad, fueling rates)
even 1 sticking valve stem will cause misfire or from having valve lash wrong, ignored by the owner at THAT step on the 60k mile service points in the operators guide.
or as simple as not setting spark gap, per the hood sticker.. bam misfire. it's really a HUGE list.
http://jeepdied.com/misfire50.txt
http://www.fixkick.com