bbigman2000

gents

on stage 3 esco, 3 bar, dark greens,t34.48, group A pump

got a glitch in 1st and 2nd gear a very slight missfire around 3800rpm

not always but sometimes, its a big miss and a backfire, and car totally judders etc then takes off

ive just fitted a new engine and it wasnt doin this before

have got new plugs, leads and distributor cap/rotor on order

are plugs getting blown out ? tried two sets still same ?

or whats goin on ? mixture wrong ? its running rich i think exhaust is sooty

any ideas

McPikie

Surely running rich wouldnt cause this??

Are the gaps correct?? What plugs you running?

Spiky

iTrader: (1)

what plugs and gap???

what leads???

faulty loom?

gazcos

iTrader: (1)

I,m no expert but i,d check the Phase Sensor gap is right and check the two wires running to it inside the dizzy as these can corode and short out !

neil d

how much boost ? usually plugs but only over 20 psi was mine doing it

bbigman2000

071 c motorcrafts also tried champions, both same.

standard leads, ive just ordered some tailor made ones from a rally guy

not suggesting running rich would cause it lads, just trying to give info that may help

thanks for the comment re phase sensor, does anyone know the correct gap lads ?

will check that out fully tmrw

bbigman2000

shes hitting 1.6-1.8 around about there mate about 4000 ish i think

Spiky

iTrader: (1)

put some NGK9's init

what gap you got on your plugs at the moment????

bbigman2000

tried some with a big gap and some with a small gap

i dont have tools that hi tech mate

neil d

champion c57c s sorted mine they dont last to long though .you got a group a coil bigman ?they seem to rave on about those ngk 9 s but are top money

bbigman2000

cool mate i aint sure about the coil, i saw those plugs at the shop today 3000miles and they need changing

ive ordered some Ł12 each ngk's instead should do the trick it must be blow out because boost only seems to spike high in 1st and second

hope that will sort it

cheers mate

Spiky

iTrader: (1)

i wouldn't hold a car out full on c57's

ngk 9's are more expensive, but last soooooooooooooooooooooooo long

bbigman2000

il update on tuesday when i get them what ive got mate i told the guy the others were blowin out so am sure he did right by me he's a rally guru

Spiky

iTrader: (1)

24though gap i think u need, well it was i think when running my stage 3 and 21psi

bbigman2000

perfect thanks mate

Rs Gus

iTrader: (2)

mine runs 071's with 35psi peak and 28held no probs may bee ya phase sensor/cranksensor

Ginge !

my ngk iridiums are all fouled up ad missing at 6grand


cant fooking gap em either

Phil

iTrader: (1)

Why not?

Ginge !

loose a tip

Rs Gus

iTrader: (2)

pull the leads of and drive the car ginge usually works just rest them on the plug

bbigman2000

cheers mate, will check phase sensor

checked crank pickups etc seemed ok

Ginge !

im getting it set up soon anyway so ill let steve at SCC sort it out

got the boost issue sorted so my work on cossies is done

the next mod im gonna do to the car will be changing to oil

Rs Gus

iTrader: (2)

they can be fooked due to heat over the years best to replace tbh for the price

bbigman2000

gus ok cheers mate will most certainly take that advice cheers

Phil

iTrader: (1)

Champion c57's are fine for any power Cosworth.. the only problems with them are small gaps/poor idle and short life... Anything else is bollocks

Versus_Creations

iTrader: (1)

Any joy yet?
It may be a sensor. If you are close i can connect the engine to Diagnostics equipment to check your system and other areas that could cause the problem.
Regards
Jano

bbigman2000

thanks mate but im in north east scotland

will run through the suggestions given in this post tmrw and hopefully will trace something that sorts it, could well be phase sensor gap etc

CosRush

Keep us updated on your findings please Bigman,

Ive got the same problem and as yet have not been able to trace the problem..