Good afternoon ,

confused here.

Had a saphire 4x4 MSD close loop stage 2 this car ran a lot better on irridium IK27 idle , ... then with normal plugs AGR 12PP.

So when I bought my 3dr last month thought put also IK27 in there but the car is for some reason above 4000 RPM running worse and misfiring.

And yes new rotor / cap and leads from MSD installed.

I did not touch the plug gap still at 0,75mm I believe .

Any ideas ?

gr,Steven

 

my mapper says denso irridium plugs are rubbish,
he found they always caused the car to misfire,
not just talking about cosworths here

 

ive got the denso in mine and are fine.. think i gapped mine to 0.6 though..

 

Set of 071s, no problems at 450bhp

Steve

 

Mmmh , I think wil go back to original any ideas were to get still the 902 spark plugs ?

 

I use them on everything and never have a problem,
What boost are you running.

Mark

 

Denso run fine in mine, Why would MSD reccommend them if they werent suitable?

 

Hi Mark,

completely standard 3 dr .

But just found by a dealership the 902 items had them still in stock but these are not blue but red ?

Steven

gr,Steven

 

on the saphire stage 2 they were great on the standard 3 door also only on higher RPMs not giving me the feeling now I got somewere else a problem ....:-(