missfire

[leecup]

My 172 cup has developed a missfire at but it only does it when the car is warm and i go over 1/4 throttle, if im really gentle it runs fine it will sit happy at 80mph but as soon as i press the throttle over 1/4 the way down it runs on 3 cylinders, it also runs on 3 at idle, ive changed the coilpack and tdc sensor i havent checked the plugs as i cant see it being this and it has magnecor leads that aren't that old,

Im stumped on this one now and id really appreciate any new ideas

 

[leecup]

anyone???

 

[Millsy]

injector!

do a search next time

 

[leecup]

injector!

do a search next time

I did do a search but as soon as someone seems to have solved the problem they dissapear .

Problem solved!! the crappy bosch super 4 spark plugs i put in 200 miles ago have broken down inside so put some oe ones back in and its now perfect

 

[Millsy]

ooft! thats not good especially as they're bosch! glad its all sorted