SP20 losing power, shuddering and cutting out

TheMAN · 22-08-2012, 10:08 PM

the coils will die prematurely if you have bad spark plugs or bad leads... this is why I recommend replacing EVERYTHING... plugs and leads are wear and tear items... many people don't know this, but this is true! The coils will work harder and eventually die!

one other possibility is a short in the wiring.... a mate's car had some dodgy wiring behind the ECU panel and I found out an earth wire that was spliced was no longer insulated from the floorboard... this short caused one coil to be constantly energized while the key was turned "ON" but engine off and melted it! He learned a good lesson that day about doing electrical work properly on his car! I taped up that wire really good and it's been fine since!

22-08-2012, 10:08 PM	#21
TheMAN Senior Member Join Date: Feb 2010 Location: USA Car: . Posts: 2,623	the coils will die prematurely if you have bad spark plugs or bad leads... this is why I recommend replacing EVERYTHING... plugs and leads are wear and tear items... many people don't know this, but this is true! The coils will work harder and eventually die! one other possibility is a short in the wiring.... a mate's car had some dodgy wiring behind the ECU panel and I found out an earth wire that was spliced was no longer insulated from the floorboard... this short caused one coil to be constantly energized while the key was turned "ON" but engine off and melted it! He learned a good lesson that day about doing electrical work properly on his car! I taped up that wire really good and it's been fine since! __________________ Protege FAQ, the best 323/Protege/Mazda3 resource enjoyed worldwide for 10 years