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Lack Of Power, Idling A Little Lumpy Etc


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#1 markus250

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Posted 28 February 2010 - 11:57 PM

Hey guys,

Mk6 fiesta with 1.4 duratec engine and only 15k miles. Right, slight problem at the moment which is intermittant but gradually getting worse.

When driving the car, there seems to be a lack of power...you accelerate in any gear and although the car goes it seems like something is holding it back. Also when idling the rev counter needle is ever so slightly fluctuating and you can feel the engine jerking the car. All this is only VERY slight though. Every so often when accelerating there won't be much power then all of a sudden without pushing the pedal any further, the car springs into life and away we go.

There are no fault codes stored, car doesn't seem to be using any more fuel and has not long had a service although i'd imagine only oil and filter were changed as it was dealer we bought it from that did the service etc.

I checked the cars MOT history and it failed an mot on emissions and had a new lambda sensor fitted and then passed (all this at Ford dealer and Ford parts). No idea if any connection to my problem but thought i'd add it?

Would this all be symptoms of a coil pack, leads and plugs or is it something else?

Help?!

Mark :)

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#2 the_white

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Posted 01 March 2010 - 09:28 AM

Similar also for my fiesta 1.25 . Especially with cold engine. When I'm trying to start (for example on lights), car slightly jumps while depressing clutch pedal and pressing accelerator. I could have 1500 or 2000rpm at the moment, but on highest load on clutch, rpm falls, like engine has no power. :(

I think it could be smt with coils, or air intake... We'll see what seniors in our ford garage thinks about it.

#3 CAR PARTS EXPRESS

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Posted 01 March 2010 - 10:03 AM

I would be looking in the direction of A set of plugs first cheapest option (10 delivered) (only 15k miles but a mk6 so a good few years old if they original) then coil pack or maf sensor.

#4 markus250

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Posted 01 March 2010 - 04:48 PM

Well i've just changed the plugs and coilpack (will do leads but they didn't have any in stock). Anyway, so far when idling the engine no longer slightly judders or anything so thats a start. I have noticed a slight hissing sound from near the coilpack area...is this normal?? I know when i had a mk1 mondeo and had a hissing noise there it was a t-piece breather pipe that had split and caused misfires and poor running etc.

Also, there's no MAF on the 1.4 Duratec, there is a TMAP sensor on the throttle body which does the same job and also something to do with air temp etc? Thats all according to the haynes book. There's so much difference in little things between the 1.25 and 1.4 duratec engines. Even my throttle has no cable and is all electronic whereas the 1.25 is cable which in my eyes is far less to go wrong! :)

Will take a drive to dealers other branch for the leads and report back if any difference.

The old spark plugs were quite dirty and looked like they'd been in there ages. They were NGK standard plugs. I have fitted the NGK Platuinum plugs as they were a good price.

Mark :)

#5 CAR PARTS EXPRESS

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Posted 01 March 2010 - 04:59 PM

Hopefully the leads will sort the rest out...the sensor is 66.55.

#6 greasemonkey1992

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Posted 01 March 2010 - 09:31 PM

clean the throlle body and you will notice a hell of a difference. a layer of grease and crap builds up round throttle body and when idling it cannot get enough air to tick over slowly. zoe

#7 markus250

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Posted 01 March 2010 - 09:52 PM

Well, been driving this afternoon and car still lacks power. Its more of a lack of power than misfiring. Does kinda jerk and then all power is there again. Gonna replace spark leads tomorrow as they weren't changed and they look a bit old and brown etc.

Will look at throttle body too.

About three times in the past two weeks i've smelt egg in the car...i know this could be the cat but does this mean the cat is buggered and causing my problems? It doesn't smell all the time too, no matter how the car is driven. I know car had new oxygen sensor for an mot a few years back? Didn't mention anything about cat etc?

Help?

Mark :)

#8 markus250

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Posted 03 March 2010 - 03:34 PM

bump for more help! :D

#9 the_white

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Posted 03 March 2010 - 07:49 PM

bump for more help! :D


1.april - I have reservation in ford garage. My FoFi will not left garage until they fix everything B)

#10 markus250

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Posted 04 March 2010 - 10:23 PM

Well, the car is still the same. Spark plugs, leads and coil have all been replaced and still having the same problems.

When i pull off it seems to feel like something is REALLY holding the car back (almost like its outta fuel) and then if i keep my foot on the gas and don't press it any further, the car is holding back and then kinda jumps into life after a few seconds and everything is fine again.

Its !Removed! annoying now as i'm assuming if i take it into Ford it won't do it as the problem is intermittant.

I've got a handheld code reader and nothing is showing up on that.

The car does seem noisy when its holding back and i push thethrottle further. More of a roar from the exhaust/engine than normal.

Could the rear silencer or cat cause these problems if they're breaking up etc??

Help please!!!

Mark :)

#11 Christopher Lightfoot

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Posted 07 August 2010 - 10:29 PM

Well, the car is still the same. Spark plugs, leads and coil have all been replaced and still having the same problems.

When i pull off it seems to feel like something is REALLY holding the car back (almost like its outta fuel) and then if i keep my foot on the gas and don't press it any further, the car is holding back and then kinda jumps into life after a few seconds and everything is fine again.

Its !Removed! annoying now as i'm assuming if i take it into Ford it won't do it as the problem is intermittant.

I've got a handheld code reader and nothing is showing up on that.

The car does seem noisy when its holding back and i push thethrottle further. More of a roar from the exhaust/engine than normal.

Could the rear silencer or cat cause these problems if they're breaking up etc??

Help please!!!

Mark :)


Hi,

Did you ever get anywhere with this; I have the same car and have exactly the same intermittent problem!! It's missues car so I didn't get to feel what she was trying to explain to me until last week when it finally happend when I was driving and it feels exactly as you describe; like there's a lack of fuel (I remember the feeling from when I used to ride bikes with manual fuel reverse switches and you had to switch to resvere while riding - I also get the hunting of the revs when idling but the issue isn't present when the car is stationary only under load.

Many thanks,
Chris

#12 jmurray01

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Posted 07 August 2010 - 10:32 PM

Could be a misfire or the timing is out. Doesn't sound like the engine running rich if its fine some times.

#13 markus250

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Posted 08 August 2010 - 07:57 PM

ok, its been a while since i've been on here but heres a little update!

Took the car to Ford and they found nothing wrong at all apart from they said my ecu was set to run off high octane fuel so they reset it and updated the software etc??!!

Car still the same. Took it to a diagnostic rolling road place near me who have done work for me before with lots of success and they couldn't find anything either. They did remove throttle body and clean etc.

Car is still the same again. I replaced the air and fuel filters and have just replaced the entire exhaust (minus the manifold cat) as the old backbox was blowing but again, the problem is still there. Seems to not hesitate and then lunge with loads of power now, its more of a constant lack of power. Although the car will still drive perfectly fine at and above motorway speeds.

If i'm in a gear for example 3rd at say 30mph and put my foot down hard, to the floor in some cases, the car seems to produce a really low exhaust note almost as if the exhaust was blocked (thats another reason for the exhaust change) and there is no go at all or very little.

There is not rattles or clunks from the cat at all.

If i put my foot down loads almost to the floor then sometimes i can hear a kind of ticking noise when kinda sounds like marbles clicking together or an electrical sparking sound? Its hard to explain the sound but thats not there all the time.

I have today noticed that from the coil side of the engine there is a hissing noise like air leaking out of a tyre but i can't pinpoint its exact location. Not sure if that would have anything to do with it.

Also whats the deal with each time i take the petrol cap off it hisses loads...could it have a fuel pressure problem??

The roar from the exhaust when booting it is similar to if you driove without an irbox attached so obviously more air getting in that fuel???

Its frustrtating that no garage these days seem to know what the problem could be as all they all seem to do is hook it up to computer and tell me there's no problems!!!!

Sorry for the essay but thats about everything so far!

Cheers,
Mark :D

#14 Christopher Lightfoot

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Posted 08 August 2010 - 09:33 PM

ok, its been a while since i've been on here but heres a little update!

Took the car to Ford and they found nothing wrong at all apart from they said my ecu was set to run off high octane fuel so they reset it and updated the software etc??!!

Car still the same. Took it to a diagnostic rolling road place near me who have done work for me before with lots of success and they couldn't find anything either. They did remove throttle body and clean etc.

Car is still the same again. I replaced the air and fuel filters and have just replaced the entire exhaust (minus the manifold cat) as the old backbox was blowing but again, the problem is still there. Seems to not hesitate and then lunge with loads of power now, its more of a constant lack of power. Although the car will still drive perfectly fine at and above motorway speeds.

If i'm in a gear for example 3rd at say 30mph and put my foot down hard, to the floor in some cases, the car seems to produce a really low exhaust note almost as if the exhaust was blocked (thats another reason for the exhaust change) and there is no go at all or very little.

There is not rattles or clunks from the cat at all.

If i put my foot down loads almost to the floor then sometimes i can hear a kind of ticking noise when kinda sounds like marbles clicking together or an electrical sparking sound? Its hard to explain the sound but thats not there all the time.

I have today noticed that from the coil side of the engine there is a hissing noise like air leaking out of a tyre but i can't pinpoint its exact location. Not sure if that would have anything to do with it.

Also whats the deal with each time i take the petrol cap off it hisses loads...could it have a fuel pressure problem??

The roar from the exhaust when booting it is similar to if you driove without an irbox attached so obviously more air getting in that fuel???

Its frustrtating that no garage these days seem to know what the problem could be as all they all seem to do is hook it up to computer and tell me there's no problems!!!!

Sorry for the essay but thats about everything so far!

Cheers,
Mark :D


Hi Mark,

Your issue is exactly the same as ours; even down to the hissing sound your hearing from the engine and the fuel tank!! I think the sound under the bonnet is coming from the fuel return line or more specifically the quick release clip (found at the end of the fuel rail with a red button on the front to release); I wiggled it about while the engine was on and the note of the hissing changed; I'd never noticed this sound before and have had my head under the bonnet many times during servicing.

I also have taken it to 2 garages so far for an inspection and neither could find out what it was; missus really wants to sell car but it's hard to sell when you know there's a fault with it :-(

Please let us know if you find the solution!! I'll reply back here too if I find anything that works.

Thanks,
Chris

#15 Christopher Lightfoot

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Posted 08 August 2010 - 09:37 PM

Btw, some one suggested leaving the filler cap removed (or loose) to allow any excess pressure build up to release but it didn't have any effect and the issue still happens; still as random as ever. We found that pulling over; switching off the engine and restarting fixes the issue most of the time; It seems to me like somthing goes wrong during startup and eventually gets worse and worse and simply rebooting fixes it.

Someone also suggested that leaving the car on a hill (facing down?) increases the odds of it happening - I've yet to try this as our road is flat but the missues did say that she mainly experiences it on the way to work (all down hill) as apposed to returning from work so potentially with the hissing sound it could be related to fuel pressure;

I hate debugging cars; Everything is so expensive - I wish I could just hook a terminal up to the car and log every sensor reading ever and then when the issue starts happenign just take a look at the sensor logs and figure out which fracking sensor it is :-D.

Chris

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