Zetec_mk4_XR3i

when i give my 4x4 cossie a good bit of right foot, it cuts out and my mate who is good with them thinks its blowing the spark out when its on boost - its just running NGK plugs from Halfords which were the ones the computer came up with when the reg was entered - any suggestions which plugs to go for? Its stage 1 with a green top engine if that helps

tabetha

071's area good plug that suits most tunes, but for stage 1 you could use AGPR12PP8, these are precious metal ones, so about £40, but with a group a coil work wonders.
You can get these bits from Matt Lewis 01922 692424, and you WILL notice a smoother idle and better low down with the plugs/coil.
It could be blowing the spark out but does NOT cause cut outs normally, just a wall of no extra boost, just revs as does not create enough exhaust gas to spin turbo very fast, as intermittantly misfiring, all you will feel is no power, no real roughness.
Use a 0.65mm gap as this works well, also make sure you have decent leads, like Magnecor etc.
tabetha

Zetec_mk4_XR3i

thanks so much

KSA-Cossie

iTrader: (4)

071's job done m8.

Zetec_mk4_XR3i

thats what i got mate but car didnt seem happy with them - think need to check the gaps on them though

put in the old ngks and it ran lovely but blew spark out on boost

KSA-Cossie

iTrader: (4)

gap them at 0.8mm my saph runs great on them.

col cos1

iTrader: (5)

myself and euan both run ngk bcr8es plugs on big specced cars with no issues and cost around £10 for four

i tried hks iridium plugs at £60 a set and they were shite kept misfiring at 7200rpm

KSA-Cossie

iTrader: (4)

I ran them in both my erst's,good plugs.

Zetec_mk4_XR3i

cheers guys - will get a set of them today to try

sorry...last question do those ngks come gapped do you know or should i check em?

cossiegreg1

col what you gapped these at