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ST170 Jerky Acceleration Between 2100rpm and 2800rpm


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#16 Jacko9966

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Posted 13 December 2009 - 04:41 PM

have you looked at the spark plugs? mine was missing badly.. like a tractor through all rev ranges.. some muppet pressure washed the plugs before i bought it and they were having a 1" deep bath lol! tested the HT leads?


Thanks for the advice but I have replaced both the spark plugs and HT leads with no improvement. The car does not seem to miss fire when it becomes jerky, you do not even notice the gaugues move at all but you just feel it, no odd sounds either.

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#17 HarryST170

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Posted 02 May 2010 - 02:51 PM

I have noticed it is doing it with a full tank as well and like the other person commented it does it worse in the cold.

It also does it now when you keep a constant throttle position between 2000 and 3000 with it being worse at around 2100.

Could it be the duel mass flywheel as my clutch's biting point is really high?

I think I have no choice but to take it to a ford dealer sometime and will let you know the outcome.






Hi, I have a focus st170 and have the same problem but it's higher up the revs, anything above 4500rpm and the jerking stars.

This problem started about 2 weeks ago and at the start of this week it got much worse. No power coming from anywhere and it was a pain to drive, jerking started at about 3000rpm this time.

I changed the spark plugs but nothing changed so booked it in and the garage said it was the coil pack. Got it back Friday apparently it was 'running like a dream' at least by that statement i know nobody had been out taking it for a drive.

So spark plugs and coil pack haven't worked for me!

#18 wrc62

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Posted 26 May 2010 - 09:01 AM

Hello everyone! I'm French, excuse me in advance for any spelling mistakes!

I have a problem on my car which is very similar to yours

I mounted a rally in Focus ST170, my engine is original, it has 95 000km is therefore Duractec 173cv. In the first race with the car, early concerns have started ...
The car has no power, she refuses to climb into the towers and when I push my accelerator pedal a little too strong, self grazing, as if she "choked". The problem has worsened over the miles.
Car stalled, I accelerate, the car turns up in nickel, the problem is not obvious that stock with a gear engaged and the slowing is perfect.
Final service last night, candles are taken apart, nickel electrode by cons Thread full of oil, it cleans, it starts, and the problem is still there we decided to give up for fear of damaging the engine.
The car does not heat, my water temperature and oil are good, there is no smoke in the exhaust and no consumption of water and oil!
I thought that the concern could come from the fuel filter, so I changed it was very dirty but not stuffy.
I expect to receive new spark plugs and new ignition wires before retrying the car, as you can imagine, it is not always easy to try a racing car with the neighborhood!

Some of you have ever had He commend this trouble? Have an idea of where you can go wrong?

Admission is entirely original, the exhaust is "home", I kept the rear silencer and catalyst is poured between the two is a pipe-line.
Before mounting competition vehicle, the car had already emptied the catalyst, and I've never had any worries

In late April I attended my second rally, following the concerns of the first race so I changed the spark plugs, ignition cables and fuel filter. Practice session one week before the race, SAR self works perfectly.
Then comes the day of the rally car at the screwed up early at the outset of the first special I saw that I had no power for miles and then over the cuts have emerged and become worse, operation until losing a cylinder at the beginning of some special. We dropped out of the fourth special after a change of spark plugs assistance that has not changed the problem.
After the race the car was taken at Ford HS coil verdict ... It thus goes a new coil.

Practice session yesterday, the car runs properly for about twenty miles, but I still feel what was not all his horses, I was able to make good suspension settings, but a sudden bang, back cuts .....
You open the hood, the coil is boiling, let cool, it starts and remain committed, it was therefore said that I burnt the coil again.

On the way home I plug in the diagnostic software on the car, no error code at the coil, for the cons I have the following error code: P0141 Oxygen sensor (H02S) 2, Line 1 heater control, circuit malfunction. Probable cause: wiring, H02S, ECM

In your worries in a lambda probes could cause these symptoms or is this actually the new coil has blown again?

I do not know how to solve this problem, could you help me? Thank you very much in advance!

#19 wrc62

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Posted 26 May 2010 - 09:08 AM

To get a clearer picture of the problem, here is a video of the first rally of the year, listen to the output pin until the end of the video you can hear the cuts, and as you can imagine, j 'was at the bottom ... but the car is not moving!

Rallye des routes du nord / Ford focus st170

#20 Michael 20

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Posted 24 December 2012 - 01:56 AM

My Focus has had the leads, spark plugs and timming belt chaged and still the car jerks, splutters and backfires. I'm wondering if the spark plug leads are in the wrong order. Next i'm replacing the solinoid etc, or it could be the fuel pumb. Eiter way, it's giving me the !Removed!.

#21 dan_st170

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Posted 24 December 2012 - 10:29 AM

Hi there, im new to the forum and seem to find the same with my st170. I have a mate how only buys fords and knows them inside, he had a press realese st170 and that done the same for his 5 years of ownership. To be honest all we seem to find is its to do with the vvt setup and changing all the parts possible never cure it or if it seems to it will be for a short time.

If thats any help theres my 2pence on your situation.......But i will admit its !Removed! annoying!

#22 FOCA

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Posted 25 December 2012 - 07:25 AM

My Focus has had the leads, spark plugs and timming belt chaged and still the car jerks, splutters and backfires. I'm wondering if the spark plug leads are in the wrong order. Next i'm replacing the solinoid etc, or it could be the fuel pumb. Eiter way, it's giving me the !Removed!.


It is unlikely that the plug leads are in the wrong order, unless it is only firing on 2 cylinders

Its sensible to replace the plugs 1st, as they are relatively inexpensive items and are a "service" item amyway

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