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No spark until you pull the lead off the plug a bit

kombikim - September 1st, 2003 at 07:25 PM

I know the answer is probably simple, but I have seen this before - runs on 3 cyl & then you pul the plug lead off about 5mm to let the spark jump to the plug & the plug fires OK, put the lead back on & the plug is dead I am sur I can find the causeon the weekend, but if anybody can post it straight off it wil help people & me

[Edited on 5-9-2003 by vanderaj]

Bizarre - September 1st, 2003 at 07:28 PM

i would try a new lead Kim

kombikim - September 1st, 2003 at 07:34 PM

thanks, that is the 1 st thing that came to mind, my internet is down at work, Kombi motor all over garage, two sick kids then my 84 yr old mum in law hit me with her Mitsi Colt being sick - a quick look & that is what I found at the moment I don't even feel loke pulling a sparkplug out on the stupid thing

FirstName V LastName W - September 2nd, 2003 at 12:50 AM

I will bet you it is the spark plug.:o

Herbie - September 2nd, 2003 at 01:30 AM

To my way of thinking the only thing that would make it improve with an air gap for the spark to jump across would be a dieing coil, as its a capacitor it will store then release the spark and if its getting weak then perhaps it needs the air gap to encourage the coil to release the charge in that instance
perhaps number 4 is the most of an extreeme.

I may be wrong, I often am, and people love to tell me if I am.

but try replacing the cheapest things first.

kombikim - September 2nd, 2003 at 12:58 PM

it will be interesting, - easily fixed by substitution last time I saw it was on motorbike with the one piece coil/pluglead thing & no dissy, the guy opened the plug gap to about 45thou in the end, not really a fix.

Andy - September 2nd, 2003 at 02:02 PM

Very strange. So it actually fires on the cylinder your pulling the cap off to create an air gap??
Couldn't be all plugs running poor, pulling the lead off a bad plug allows the rest to fire better?
Can be so many possibilites. :o

kombikim - September 2nd, 2003 at 02:23 PM

yep except it is only on one plug, interesting problem in that --- your vehicle is running on three cylinders so, you pull the plug lead off one at a time to find the dead cylinder & if you ull it off quick enough, you don't find the problem, something to remember!

kombikim - September 2nd, 2003 at 11:21 PM

It wasn't the spark plug lead, I will have another 15minutes go at it tomorrow night, it is only a stupid Mitsubishi but the answer would be useful to everybody

Purple Martin - September 3rd, 2003 at 12:02 PM

Just a guess - maybe the plug isn't making good electrical contact with the head. Is it properly tightened with a fresh compression washer?

FirstName V LastName W - September 3rd, 2003 at 09:38 PM

Have you tried replacing the spark plug ?????????????????????????.
Would be easy as replacing the lead and cheaper than a lead.:o
If I was a betting person that is what I would put my money on.:thumb