Hi everyone, I am here seeking advice!
A few months ago I purchased a Mondeo ST220 which uses the Duratec ST engine; albeit a Duratec 30 with a few slight modifications.
I have done 5,000 miles in the car and no complaints at all, however I think I can feel a very weak misfire at idle; and maybe at around 2,200RPM (in neutral). I cannot feel it while moving.
It really is very subtle and I would wager that 99% of my passengers wouldn’t notice it, that if it is a misfire. I have been speaking with a competent mechanic who insists I should get to the bottom of it straight away as it will encourage the shells to spin; which would leave me with a £5000 bill for a new engine.
If it is misfiring I have been informed that the following could be the cause:
[FONT="]1. Worn plugs, or leads, or coil pack.[/FONT]
[FONT="]2. Air leak in plenum chamber or one of the vacume hoses, check especially the ones that come off the rocker covers and go to the plenum.[/FONT]
[FONT="]3. Bad injector[/FONT]
[FONT="]4. Blocked cat[/FONT]
[FONT="]5. duff lamda or O2 sensor your car has two of each. These can be tested with a continuity meter.[/FONT]
Before I go replacing everything, I would like to hear people’s opinions on the matter. I listened to the exhaust note to see if I could hear any puffs or bangs but it all sounded good to me. I have uploaded two video clips.
15mb & 17mb, right click save target as
www.robster-lobster.co.uk/st220/exhaust.wmv
www.robster-lobster.co.uk/st220/engine.wmv
I am aware of the slight ticking noise, but this is a minor fault that a lot of ST’s suffer from. Is there something amise as I hold the revs at 2,200? (20-28 seconds).
Another note, would a misfire affect the cars performance?
If it’s of any concern the car has done 60,000 miles and was serviced 7,000 miles ago, I have also just had to top it up with a litre of oil. I drive the car hard but forgiving.
Despite this ‘shudder’ the car is still silky smooth and returns 32mpg over a tank and will still hit 6,000RPM in 6th gear with no problems at all. So perhaps it’s a characteristic of the car?
All advice is appreciated!!!
Thanks in advance.
A few months ago I purchased a Mondeo ST220 which uses the Duratec ST engine; albeit a Duratec 30 with a few slight modifications.
I have done 5,000 miles in the car and no complaints at all, however I think I can feel a very weak misfire at idle; and maybe at around 2,200RPM (in neutral). I cannot feel it while moving.
It really is very subtle and I would wager that 99% of my passengers wouldn’t notice it, that if it is a misfire. I have been speaking with a competent mechanic who insists I should get to the bottom of it straight away as it will encourage the shells to spin; which would leave me with a £5000 bill for a new engine.
If it is misfiring I have been informed that the following could be the cause:
[FONT="]1. Worn plugs, or leads, or coil pack.[/FONT]
[FONT="]2. Air leak in plenum chamber or one of the vacume hoses, check especially the ones that come off the rocker covers and go to the plenum.[/FONT]
[FONT="]3. Bad injector[/FONT]
[FONT="]4. Blocked cat[/FONT]
[FONT="]5. duff lamda or O2 sensor your car has two of each. These can be tested with a continuity meter.[/FONT]
Before I go replacing everything, I would like to hear people’s opinions on the matter. I listened to the exhaust note to see if I could hear any puffs or bangs but it all sounded good to me. I have uploaded two video clips.
15mb & 17mb, right click save target as
www.robster-lobster.co.uk/st220/exhaust.wmv
www.robster-lobster.co.uk/st220/engine.wmv
I am aware of the slight ticking noise, but this is a minor fault that a lot of ST’s suffer from. Is there something amise as I hold the revs at 2,200? (20-28 seconds).
Another note, would a misfire affect the cars performance?
If it’s of any concern the car has done 60,000 miles and was serviced 7,000 miles ago, I have also just had to top it up with a litre of oil. I drive the car hard but forgiving.
Despite this ‘shudder’ the car is still silky smooth and returns 32mpg over a tank and will still hit 6,000RPM in 6th gear with no problems at all. So perhaps it’s a characteristic of the car?
All advice is appreciated!!!
Thanks in advance.