A little while ago, my EF Fairmont I6 Auto developed a missfire that would come and go, and I believed it was because the plugs and leads were around 70,000km old. Well, after recently replacing plugs with NGK Type R's and Eagle 9mm silicone leads, the miss dissapeared.... for a couple of weeks anyways. Now the miss comes and goes every couple of days.
I used to always run premium (mobil 8000 or BP Ultimate) but due to fuel prices lately, have switched back to regular unleaded. I thought then maybe running on normal ULP after running premium for so long was havin an effect, but after switching back to premium (@ $1.12/ L ) it made no difference.
Does anyone have any other idea's as i'm a little stumped. Also, the idle seems to be suffereing lately, with a lumpy idle, and occasional almost stalling, before the ECU picks it up and increases revs to 1000rpm temporarily.
Thanks for the tips MADNC_8, but I have had the head gasket replaced already, around 10,000 kms ago. The old plugs were a dark grey when they came out, but not black. and I'm not losing any excessive water between services (lose a tiny bit through evaporation)
Sounds like it may be the coil packs, anyone have any idea how much these are to replace?
The coil pack itself will set you back about $250 plus whatever your mechanic charges for labour.
Before you go replacing the coil pack you might want to give the Idle Speed Controll Motor (that thing on top of the throttle body) a clean with carby and throttle body cleaner ($10-$15) because that is a well known cause of missfire and rough idling in the EF or you can buy a new one for about $150.
Before you go replacing the coil pack you might want to give the Idle Speed Controll Motor (that thing on top of the throttle body) a clean with carby and throttle body cleaner ($10-$15) because that is a well known cause of missfire and rough idling in the EF or you can buy a new one for about $150.
thanks for the sugesstion FlknTuff, but I have cleaned the idle speed control recently, and the throttle body as well. I had a rough Idle once before, not long after purchasing the car 4 years ago, and fixed the idle through doing this. now I clean it at every service to mainting smooth idle, but I think its something more sinister this time :fraz: I dont think i will be forking out for a new coil pack straight away though at $250, I will see what the codes give me on the weekend.
Replay your fuel filter mate. Same thing is happening to mine after i ran the fuel down so low and with the premimum and that as well. Once i changed back over it started to do it and i replaced the fuel filter and it stopped.
Give it a go.
bart
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