My 96 sti has had a misfire for the last few months, no fault codes so expected coil packs, so took it to a garage with a set of working coil packs off a working engine yet still no better. The original coil packs were replaced which eradicated the problem for a few days but now the problem has resurfaced

I kind know the answer (a set of new coil packs) but I have since tried another set of coilpacks off a perfectly fine car and it's still playing up

 

spark plugs????? when were they last done?

 

About a week ago

 

wont b that then unless they r gapped wrong.

 

HT leads breaking down?

 

Ok I had a missfire due to spark plugs

I would checking you gapped the spark plugs correctly- did u just plug them in or check gapping
I had similar experience where the gapping was wrong from new
When does missifre happen- certain revs or gears?

 

3rd and 4th gears at around 4-5000 revs

 

It was fine all day today, then driving home this evening it started jerking and hesitating again anyone know the cheapest place to get a set of coilpacks

 

The exact same thing is happening on my05 wrx. I've chaanged the spark plugs but it's still doing it. I bought the spark plugs from Haldords but didnt check the gapping. What is the gapping for a 05 wrx?

 

hi bud,i have a sti 95year,had the same probs,i went for 3 week,one day it was great,i could do 100 mile,other times it would miss after 3 mile,i changed plugs,4 new coil packs,maf sensor...turned out to be the ecu,the coil driver had gone down in it...save your money not buying coils,see if you can borrow a ecu see if it clears...then spend

hope this helps

 

I had this on my car ages ago, do the basics, fully check the coil packs, plugs and the gaps and clean or test the maf for functioning properly.