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Fiesta-Si.com :: View topic - revving/juddering update
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revving/juddering update
https://www.fiesta-si.com/forums/viewtopic.php?f=4&t=11120
Page 1 of 2

Author:  andyleesy [ Mon Apr 14, 2008 6:53 pm ]
Post subject:  revving/juddering update

Hi all,
deveopled a problem ironically 1 week before the cars M.o.t....
basically when i floor it, or even give it a reasonable amount of gas it starts spluttering, very heavily/violently misfiring (in terms of power), and judders to buggery, making me look like a learner bunny-hopping :red: . the revs splutter at 3200rpm and drop to 2700rpm, if i keep it flat it will eventually get past 3200rpm but will struggle and splutter...
if i go half throttle up the rev range it's mostly fine, no problems....
it also starts sputtering and struggling at 5000rpm upwards...
smells abit but think it's the excess fuel after every exhaust pop....
unplugged lamba sensor....stayed the same
unplugged maf... stayed the same
one of my wires to the distributor is abit chewed up and does need sorting, but doubt this would be the cause of it?
any ideas?
andy

Author:  woodsy_mv6 [ Mon Apr 14, 2008 7:35 pm ]
Post subject:  Re: A new revving problem 1 week before m.o.t

Id put my money on it being your lambda.

Author:  andyleesy [ Mon Apr 14, 2008 11:14 pm ]
Post subject:  Re: A new revving problem 1 week before m.o.t

but would the lamba 'all of a sudden' go?
idling has been up/down for a while mind, may be linked...
cheers
andy

Author:  A L 3 X [ Mon Apr 14, 2008 11:29 pm ]
Post subject:  Re: A new revving problem 1 week before m.o.t

I discovered some simlar symtoms when i forgot to plug in the air flow meter/MAF sensor.....but tht wasn't a fiesta

Author:  happypaul [ Tue Apr 15, 2008 12:41 am ]
Post subject:  Re: A new revving problem 1 week before m.o.t

i'd check that wiring out for a start

then try any bits out you can by swapping them over

make sure all your wires and plugs are plugged in correctly

Author:  EvilDes [ Tue Apr 15, 2008 7:42 am ]
Post subject:  Re: A new revving problem 1 week before m.o.t

Clean your MAF :lol: :insanity:

How bad is this chewed wiring on your distributor?

Author:  andyleesy [ Tue Apr 15, 2008 10:12 am ]
Post subject:  Re: A new revving problem 1 week before m.o.t

quite. i'll get a pic up and show you, it is really rather random though :look:
i've got a spare MAF so willl swap it over...
cheers all
andy

Author:  happypaul [ Tue Apr 15, 2008 11:39 am ]
Post subject:  Re: A new revving problem 1 week before m.o.t

spare maf might not do the trick, clean it :P

Author:  andyleesy [ Tue Apr 15, 2008 12:18 pm ]
Post subject:  Re: A new revving problem 1 week before m.o.t

Here are the wires going to the plug that powers the Dizzy, think its obvious which one im on about :lol:

Image
Image

Swapped Maf to no avail.... both Mafs have been recently cleaned anyway so had a feeling it might not be the maf... the juddering seems far to violent to be the maf from my own experience...
andy

Author:  EvilDes [ Tue Apr 15, 2008 12:26 pm ]
Post subject:  Re: A new revving problem 1 week before m.o.t

Fix that wiring up for starters before it gets really bad. Doesn't look tooooo bacd, but obviously being exposed isn't doing it any favours.

Also, have a feel under that coil pack of yours and there's a little L shaped piece of rubber, these are prone to disintergrating and causing a hole in the vacuum. Might not solve your problem as it would cause slightly different symptons, but do it anyway as it might... :)

Not got a leaking injector or anything have you? Have you had a good look at everything in the engine bay before you buy any parts? :)

Author:  andyleesy [ Tue Apr 15, 2008 12:31 pm ]
Post subject:  Re: A new revving problem 1 week before m.o.t

how would i fix that wire up out of interest because i was thinking of getting it done today but am abit of a newb with wires...
will have a poke around under the coilpack...
do you think its most likely a sensor or mechanical causing this?
cheers
andy

Author:  Ry [ Tue Apr 15, 2008 12:41 pm ]
Post subject:  Re: A new revving problem 1 week before m.o.t

i'd put my money on this being an electrical/sensor issue. I see this all the time on the 306 forum and it's usually the lambda, ICV, or coilpack.

Author:  woodsy_mv6 [ Tue Apr 15, 2008 1:30 pm ]
Post subject:  Re: A new revving problem 1 week before m.o.t


Author:  andyleesy [ Tue Apr 15, 2008 1:43 pm ]
Post subject:  Re: A new revving problem 1 week before m.o.t

but i thought by unplugging the lambda sensor the ecu you use preset settings based on the MAFs reading, therefore it should run normal with the lambda unplugged or no? just wondered :lol:

Author:  woodsy_mv6 [ Tue Apr 15, 2008 2:03 pm ]
Post subject:  Re: A new revving problem 1 week before m.o.t


Author:  andyleesy [ Tue Apr 15, 2008 2:11 pm ]
Post subject:  Re: A new revving problem 1 week before m.o.t

60k genuine miles. ford service history when i bought it....
seems like when these fiesta's hit 50/60k everything falls to pieces...
i could list my problems since turning 50k but i'd be here all day

Author:  happypaul [ Tue Apr 15, 2008 2:17 pm ]
Post subject:  Re: A new revving problem 1 week before m.o.t

with regards to that plug, go to the scrappers and get another plug from a zetec engine'd car, fiesta escort mondeo. and cut off a few inch of wiring with it, then replace the plug completely and solder the wires together than wrap it up in tape. thats what we had to do for my iscv wiring :)

Author:  woodsy_mv6 [ Tue Apr 15, 2008 3:14 pm ]
Post subject:  Re: A new revving problem 1 week before m.o.t


Author:  chop_suey [ Tue Apr 15, 2008 5:01 pm ]
Post subject:  Re: A new revving problem 1 week before m.o.t

i had a similar problem, turns out i had a hole in a vacume pipe.

Author:  EvilDes [ Wed Apr 16, 2008 7:21 am ]
Post subject:  Re: A new revving problem 1 week before m.o.t


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