Drove my escort home from work gave it a bit of stick in third and started missing and throwing out black smoke of exhaust. But then when u come back on boost clears untill i come off throttle and on again.When i rev it in neutrul misses all the time no white smoke just black. Seems to be electrical cap and rotor are nealy new have a spark on all cylinders.Has anyone had this problem i suspect plugs took them out and gaps seem fine and they look ok ANY HELP APPRECIATED THANKS

 

Have you tried cleaning up the points in the cap? what about the leads are they newish?
What boost are you running on what ECU?

 

Timing ?

 

i am running a bajoo ecu leads are nealy new same as cap .have found that the miss is on number 2 seems to have good spark from lead to plug thinkin maybe done headgasket between 2 and 3 gonna do a compression test tommorow and put in new plugs only had new engine in for two weeks running 1 bar .had so mutch bad luck last week blew turbo monday put on another blew gearbox thursday put in another now this week problems keep commin the joys of ownin an rs turbo

 

black smoke is usually excessive amounts of fuel or unburnt fuel in the dodgy cylinder

 

i under stand that that is why i suspect a faulty plug but why does it clear slightly under boost

 

i would say that under boost there is more air to compensate the fuel, perhaps its just overfuelling on the one cylinder is it efi or mfi?

 

just a thought while its dark out just go and start the car up and look under the bonnet, it is a good way of the checking the plug leads as you will see them arcing out if they are knackered

 

couldnt do that last night babywas asleep would of woke her missis would have gone mad put a set of plugs in to day and done comp test problem fixed was the plugs bit strange thanks for your suggestions

 

i was going to suggest plugs till i read the last post. min had been missing on cruise, but fien on boost, popped plugs out, cleaned them and made sure the screw caps which the leads attatch too were tight and all was good again.