Focus ST170 - Misfire in high gears
#1
Virgin
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Join Date: Dec 2015
Location: Toton, Nottingham
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Focus ST170 - Misfire in high gears
I've had my 2004 ST170 for 2 years now, and I love it to bits...which is quite wierd since I've owned my 2007 Wolf ST3 ASBO for over 5 years...and really prefer to drive the 170 on a daily basis.
...But there's a problem I just can't get my head around.
The engine performs perfectly (with the usual intermittant hesitation when accelerating through 1500 - 2000rpm), as expected with Ford, all the way up to 6000rpm...as long as I stay in 4th. As soon as I select 5th/6th, I get a misfire around 70mph, and insufficient power to accelerate. Like I said, if I drop to 4th & boot it, everything is fine...all the way up to 6000rpm.
It's running fully synthetic 5w30, changed in early November.
I also changed the plugs, as a matter of course...but there was no change.
Can anybody shine any light on this?
Maybe a swirl flap, cam timing issue???
Thanks in advance
...But there's a problem I just can't get my head around.
The engine performs perfectly (with the usual intermittant hesitation when accelerating through 1500 - 2000rpm), as expected with Ford, all the way up to 6000rpm...as long as I stay in 4th. As soon as I select 5th/6th, I get a misfire around 70mph, and insufficient power to accelerate. Like I said, if I drop to 4th & boot it, everything is fine...all the way up to 6000rpm.
It's running fully synthetic 5w30, changed in early November.
I also changed the plugs, as a matter of course...but there was no change.
Can anybody shine any light on this?
Maybe a swirl flap, cam timing issue???
Thanks in advance
#3
I'm Finding My Feet Here Now
I put a Lucas coil pack on mine recently. Was fine for a month then started with the same symptom's your having. Swapped it over with my other 170's mototcraft jobbie and all is fine again.
Screw you Lucas
Screw you Lucas
#5
Advanced PassionFord User
Buy msd coil pack kit from pumaspeed fits straight on even thou it's an early zetec pack comes with new leads etc
Bargain really as ford don't sell the leads as a set anymore so you buy them separate and all 4 was around £80 robbing bastards
It's the uprated blaster coil pack
Hope this helps
Bargain really as ford don't sell the leads as a set anymore so you buy them separate and all 4 was around £80 robbing bastards
It's the uprated blaster coil pack
Hope this helps
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