Jerky Acceleration

[ben1191]

say im rolling in gear at 30mph,if i press the throttle progressively,nothing will hapen for the first 3mm and then it will jerk,theres no smooth delivery of power.

the only thing i can think of is the air box,its not held on tightly as 3 of the 5 screws or w/e are threaded so i can literally half remove the top cover by hand.Or could it be anything to do with the MAF or anything else inside it?Also dont like the way it coasts along it feels jerky in itself and the revs appear to stick although im not 100% as ive only done about 300 miles in it over the last 2 months :P

i've had a split intercooler pipe on the focus and it didnt jerk but i presume thats a different thing.

When i stab the throttle in neutral it makes the sporty sound it has but you can hear a tssss but its not there throughout the reving. I'll post a video of the sound.

any ideas?

[MattDRX]

Sounds more like one or more of, plugs, leads or coil pack corroded. Will cause it not to run smoothly and effectively lag on power, once under heavy load it will pick up better.

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[ben1191]

maybe its the plugs then?it starts instantly everytime but does idle rough for the first few mins but then calms down when its warm?

[ben1191]

Not sure how to post a video from phone.not entirely sure if the plugs in good or bad condition,the don't look like originals so they've been changed at some point which is good I guess

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[ben1191]

trim.EFCD2660-C717-46F8-A28D-80F4CAF930C9.MOVtrim.5CBA15E2-6168-4BF8-A110-0E381F999135.MOV

[MattDRX]

Those plugs are dead lol the white on the tip is corrosion the rest is just rust. Get some Bosch ones off eBay for £18 a set of 4.

Edited July 29, 2014 by Stoney871
Removed Ap Tag

[ben1191]

Europarts have Bosch ones £2 each

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[ben1191]

Planned on new plugs anyway,only thing I havnt done on it since I bought it,shoulda been the first thing I suppose lol

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[MattDRX]

Either way all good. Yep every time I buy a car 2nd hand always gets an oil change, plugs and leads.

Edited July 29, 2014 by Stoney871
Removed Ap Tag

[ben1191]

Dont suppose you know which ones i should choose, one says 1.0,1.3mm and the others 1.1?

http://www.eurocarparts.com/ecp/c/Ford_Fiesta_1.6_2001/p/car-parts/engine-parts/ignition1/spark-plug/?408772090&1&162eaa809f452af935286e046cd236327fbee329&000301

http://www.eurocarparts.com/ecp/c/Ford_Fiesta_1.6_2001/p/car-parts/engine-parts/ignition1/spark-plug/?408772300&1&d90190bdec73f0cb4bb8467b4427ec80761fb013&000301

[MattDRX]

No idea dude. Tbh it's not something I've ever looked at. Normally I just put X car spark plugs into eBay and buy whatever comes up. Give it a whirl and see if it says the gaps under the listing info.

Edited July 29, 2014 by Stoney871
Removed Ap Tag