Zetec_mk4_XR3i

got a set of these plugs for the cossie but they are playin up - were brand new from matt lewis motorsport but car wouldnt start with them in - any idea if they are gapped from the factory and if not what should they be gapped at? Its a 1992 sapphire cossie running stage 1 - cheeRS

big mac

iTrader: (7)

gap should be 25-28 thou they will probably run a bit rough from cold as is a cooler running plug hope this helps

regards ian

Zetec_mk4_XR3i

thanks will these plugs be ok for stage 1? old ones were blowing out spark on boost?

KSA-Cossie

iTrader: (4)

These plugs are good for up to 400 bhp m8,gap them to 0.75 - 0.8mm .

GaryHurn

iTrader: (1)

i run these plugs on my cvh turbo and my zvh turbo never have a problem hot or cold!

lawnsy

iTrader: (1)

i also got a set off matt about 4 weeks ago and just put them in on wensday and i had to take them out and put me ngk's back in after a couple of runs as the car was running shit.......it was missing badley

tryed the gaps at .80 then .70 then down to .60 but still ran the same

col cos1

iTrader: (5)

replied to your other thread

St3V3_C

Something proper wrong then - without stating the obvious, did you put the leads back in the right order?

pee vee

If the spark is 'blowing out' on stage one boost, the problem isnt the plugs i wouldnt say mate..

PS: 071s are gapped at an angle IIRC.

my cos on MSD stage 3 with them plugs never ran rough even very cold.
would check your ignition system in general

crank sensor
leads, coil etc.

coswurv

iTrader: (8)

mine are from matt lewis but about 6 months ago and im running greys with 34psi spike with no probs, maybe a bad batch

NUTTIN RILLA

I got mine from matt to and they needed gapped, remember only a tiny bit out and it can blow the spark out.

As PEE VEE said if it wont start im afraid its not just the case of plugs not being gapped, it would still start up but only be rough when you tried to power it up

My car i thought was ok till i reached about 5k then it started missing a little as if im hitting a rev limiter, gapped them to .6 and it was fine right to the red line

Neil S

iTrader: (1)

Have you put the lead caps on them?

It's worth nipping them on with a pair of mole grips as they can vibrate loose and cause misfires when on boost.

Neil.