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Author Topic: Jerking when accelerating?? any ideas??  (Read 1068 times)

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Kevandwiz

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Jerking when accelerating?? any ideas??
« on: 08 February 2010, 21:49:24 »
Thanks for looking guys - basically when accelerating i'm getting a lot of jerking and the revs are fluctuating quite dramatically causing the car to jump back and forwards.
It generally happens between 2000 and 3000 rpm and the revs drop and rise roughly 500 rpm when it starts.
Usually happens under 'moderate' acceleration and it stops if I ease off the pedal, or put my foot down a bit.
If i'm real gentle on the pedal it tends not to happen but obviously this is not always practical!
Any help would be much appreciated - cheers
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cem_devecioglu

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Re: Jerking when accelerating?? any ideas??
« Reply #1 on: 08 February 2010, 21:58:07 »
any error codes ?

2 things came to mind, some problem with autobox or air intake :-/
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Welung666

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Re: Jerking when accelerating?? any ideas??
« Reply #2 on: 08 February 2010, 21:58:24 »
Where are you Kev?
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Bumbazor

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Re: Jerking when accelerating?? any ideas??
« Reply #3 on: 08 February 2010, 22:04:42 »
Could be the crank sensor; mine gave similar symptoms (although not a 'jumpy') when it was failing. Check for code 19, using a paperclip or similar, instructions for which can be found in the 'Maintenance Guides' section.
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Bixy1

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Re: Jerking when accelerating?? any ideas??
« Reply #4 on: 08 February 2010, 22:18:23 »

Is it 'drive by wire' or an ordinary cable?  :-?
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Hannah Judes Dad

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Re: Jerking when accelerating?? any ideas??
« Reply #5 on: 08 February 2010, 22:29:51 »
Also check the maf sensor as I found out on mine at about 2000 rpm it stuttered a lot especially when going up hill.I unplugged it first and it did make a noticeable difference.Replaced it with one from my other car and heypresto result.I hope that helps. :y
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cem_devecioglu

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Re: Jerking when accelerating?? any ideas??
« Reply #6 on: 08 February 2010, 22:34:52 »
and last try, DIS .. :-X
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gra11

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Re: Jerking when accelerating?? any ideas??
« Reply #7 on: 08 February 2010, 23:33:48 »
Plain and simple any chance you have run it really low on fuel recently? It could be a fact that there is then dirt in the fuel system that has been pulled out the bottom of the tank. If so try a bottle of wynns or reddex fuel cleaner next time you fill up, and see if that fixes it
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Kevandwiz

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Re: Jerking when accelerating?? any ideas??
« Reply #8 on: 09 February 2010, 08:34:27 »
thanks all i'll have a look and get back to you!
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Marks DTM Calib

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Re: Jerking when accelerating?? any ideas??
« Reply #9 on: 09 February 2010, 08:40:46 »
Hmmm.....as a general rule, jerking will be a miss fire.

So inspect your setup, if it was an air leak you would expect idle to be affected but, under the conditions you describe, you need max voltage at the plugs to ignite the fuel mix.

So I would be inspecting the plug leads etc and checking for oil/water in the plug wells.
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Kevandwiz

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Re: Jerking when accelerating?? any ideas??
« Reply #10 on: 09 February 2010, 09:50:44 »
hi again - i have checked the fault codes and the following have appeared:

74   Mass Air Flow Sensor Voltage High


132   Exhaust Gas Recirculation (EGR) Valve Feedback Incorrect Signal

whats my best plan of action??

thanks again
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Marks DTM Calib

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Re: Jerking when accelerating?? any ideas??
« Reply #11 on: 09 February 2010, 09:54:53 »
Well....EGR needs attending to to start with.....so take it off, clean it realy well (oven cleaner) and when re-fitting blank it off with a piece of metal to rule it out.
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cem_devecioglu

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Re: Jerking when accelerating?? any ideas??
« Reply #12 on: 09 February 2010, 13:41:29 »
I must remind :ignition setup (DIS,Plugs etc) wont store any codes..
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