Hi, i'm new to this board, i saw u in the fast ford u all seem to have pritty tidy motors . Anyway i have a prob with my rsi, it misfires after about 10 to 15 min of hard driving until the ignition is turned off then back on, this seems to cure it for another 10 mins. The prob started after it going in for new sills and an MOT. I talked to a guy who was a ford dealer he said that the current from the welder might have screwed the ecu. I had an xr3i dizzy lying about so i stripped the ecu and the twin coils and swapped for the 3i dizzy. Now the car goes for slightly longer before the misfire starts but the misfire is still there . The other thing was the alternator was changed while it was in for the MOT could this be the problem? Any suggestions would be greatfully recieved.

 

Do you know anyone else with an RSi? If so you should 'borrow' their ECU and see if it clears the problem. Usually its the coils that cause something like a misfire but if you've already taken them off (shame btw) then the ECU would be my next part to test.
Its unlikely to be the alternator........... but the problem with mk3 Escorts is that the electrics can be a right pain in the arse if a fault occurs. If I were you i'd test the ECU first, see how you get on with that, then if no joy look at other possibilities.

Im sure the lads will correct me if im wrong in any of the above

 

If it's still the same even when running dizzy Have you tried changing the plugs/leads (sounds stupid) but why go straight for the expensive/complicated stuff. Start by working through a process of elimination.
Could just be a plug breaking down ?????

Give them a try and let us know - good luck

 

Cheers, i'll try some of the simple things if nothing works i'll take it to a mechenic who was recomended 2 me for electrical faults.

 

Try taking the gearbox sensor lead out ( held in the underneath of the gearbox by 3 x 10 mm bolts) give it a clean & put back in, make sure its tight & the gap between the flywheel & the head of the sensor lead is correct, 0.4 -0.8mm, larger the gap ( within spec) the better in my experience.Good luck! let us know if you sort the problem & if you dont!

 

Welcome to Pf RSi Stu

Did your welder mechanic disconnect the battery earth lead before starting any welding ? He should have.

PS re the mag article ...... I'm apparently the 'mad' one - so take no notice of me

Tony

 

As Pete said it cold be just a plug breaking down when it gets hot chuck a new set in as they aint expencive they don't last for ever.I put a clutch in a Fiat Punto last week and the silly bint came back the next day with a miss fire and said that i had done something to it put a new set off plugs in and it was cured then charged her for them as well.

 

Happy new year to everybody, sorry i havent updated this in a while, have just started a new job in aberdeen. The ;scort is running fine now , turned out that it was the fuel warm-up regulator that was at fault, my mechanic couldn't source a new one, but he stripped the old one down and rebuilt it.

 

Well done