T28 RST

The car was sitting for 5 weeks before National day then the day before i set off it developed a problem

If i go above 10 psi it starts missing then when i lift off the accelerator it backfires

Normal driving its fine but only when the boost starts to rise

Its had new plugs, cap, rotor arm in the past 3 month

Andreas

Have you gapped the plugs correctly? I get similar symptons when the plugs are worn or gapped incorrectly.

Anonymous

As above, plugs would be by my first guess.

Worth getting rid of the resistor in the rotor arm if you have one too.

HORNETS7

hi davie sounds like your blowing out the spark when on higher boost

KSA-Cossie

iTrader: (4)

Take it to ava.

Paul1982

Denso Iridium high grade plugs are ment to be good quality ones

http://www.densoiridium.com/

Andreas

I thought so but I begin to wonder when my set lasted a summer with only two trackdays. It was the normal platinum ones though and not the iridums but still lousy as thats what a set of Motorcraft 071 would manage and at one third of the price.

Cawood

my cossies doing the same too davie, piss annoying!

THEDMAN

iTrader: (1)

Did you think I was winding you up????????

Look at the first 3 replys................

foreigneRS

why do people say that? is the spark a candle?

it's simply that the spark can't make the gap as the resistance from the air/fuel mixture is too high.

can't we have this saying officially 'rebranded' to 'spark can't jump the gap' or something?