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Slight Shudder When Braking And Clutch In!


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#1 Andy1716

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Posted 28 July 2011 - 06:57 AM

Hey guys, i bought my focus not long ago and have recently noticed that when i put me clutch in and brake (coming up to traffic lights or something), the revs will just dip under the amount they should and they car will slightly shudder as if its going to stall, its not much but just wanted some feedback about it as i dont know what it is, i have the 02 model focus Chic, 1.6 16v, Thanks chaps

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#2 Soulboy

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Posted 28 July 2011 - 07:58 AM

Hi,

How does the clutch pedal feel? And in particular how high is the biting point?

#3 jeebowhite

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Posted 28 July 2011 - 08:03 AM

Could be the idle control valve I suppose?

#4 Andy1716

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Posted 28 July 2011 - 08:23 AM

Could be the idle control valve I suppose?


The clutch pedal is fine and the bite is relatively high but dont think its 'too' high. Not too good on cars and have never screwed around with anything so wheres the idle valve and what should i do about it?

Andy

#5 artscot79

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Posted 28 July 2011 - 08:52 AM

The clutch pedal is fine and the bite is relatively high but dont think its 'too' high. Not too good on cars and have never screwed around with anything so wheres the idle valve and what should i do about it?

Andy

depends on how much it dips really a lot of focis have a tiny shudder thats just noticeable but not anywhere near stalling the car

#6 jeebowhite

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Posted 28 July 2011 - 08:58 AM

Quoted from FocalJet:

"The valve is located on the intake manifold inbetween the head and the manifold. You need to unplug it and then remove the 2 bolts using a 1/4" ratchet and either a 10mm or 8mm shallow socket. I have never removed one of these with the intake on the car, but I do know it's a little PITA."

Thats how to get to the ICV, could be a replacement if you can get it cheap enough, otherwise, I dont know if you can clean it out

take a look at this it might help:

http://forums.focalj...trol-valve.html

#7 Andy1716

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Posted 28 July 2011 - 09:03 AM

Thanks for the link, anad all the answers guys, will give it a go!

will post on how i get on,

Thanks, Andy

#8 johnS

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Posted 29 July 2011 - 02:22 PM

does it happen more with a high electrical load on the engine, for example with air conditioning on?

If so, I have it too

#9 Drazha

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Posted 29 July 2011 - 02:38 PM

does it happen more with a high electrical load on the engine, for example with air conditioning on?

If so, I have it too


Could be !Removed! battery then. I was looking for a way to stick in a Halfords Heavy Duty Baterry in it instead of the "standard" ones.

#10 johnS

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Posted 29 July 2011 - 02:57 PM

Could be !Removed! battery then. I was looking for a way to stick in a Halfords Heavy Duty Baterry in it instead of the "standard" ones.



I dont know though, since the alternator will be providing electrical power?

#11 Drazha

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Posted 29 July 2011 - 04:21 PM

I dont know though, since the alternator will be providing electrical power?


Well, dont forget the alternator is feeding everything else as well. And charging the battery. On my old '96 Rover, I put the Halfords Heavy Duty battery, not a misfire since. It eats petrol at 10l/100km but thats another matter.

#12 johnS

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Posted 29 July 2011 - 04:27 PM

Well, dont forget the alternator is feeding everything else as well. And charging the battery. On my old '96 Rover, I put the Halfords Heavy Duty battery, not a misfire since. It eats petrol at 10l/100km but thats another matter.



thats true, but due to the smart charge system it stops charging the batt after it's full, the problem if it's the same as the original poster's problem still happens after recharge has taken place

#13 dp1987

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Posted 29 July 2011 - 05:47 PM

Hey guys, i bought my focus not long ago and have recently noticed that when i put me clutch in and brake (coming up to traffic lights or something), the revs will just dip under the amount they should and they car will slightly shudder as if its going to stall, its not much but just wanted some feedback about it as i dont know what it is, i have the 02 model focus Chic, 1.6 16v, Thanks chaps


Dont know if its the exact same thing but i have a 52 Focus CHIC aswell and when i first bought it while driving home i noticed the rev's dropped really low and it felt like it was going to stall when stopping. It was also really hard to get the biting point and enough power to take off without it shuddering. Then the engine warning light came on a week later. took it to my trusty garage and they did a full
SPARK PLUGS AND COIL PACK change for £100 and that solved the problem. Its felt much more responsive and more nippy since i had that done.

#14 artscot79

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Posted 29 July 2011 - 08:26 PM

right theres a few things here first off the high electrical load issue thats normal nothing you replace will change this reason is simple the battery is providing the power to these components the alternator is charging the battery at the same time when you slow down and stop a few things happen the alternator for one is now spinning slower so the charge to the battery has now dropped essentially youre using more charge than you are putting in also the ecu is bouncing the revs up and down they dont stay static as the ecu will alter fuelling to get the lowest possible emissions the foci idles at 730+/- 30 rpm thats 670-760 max not 900 like older cars which is why you have that dip. secondly the alternator doesnt stop charging the battery the alternator uses sensors in the engine and ecu that tell what the engine temp is outside temp and battery electrolyte temp as well as charge etc when the battery and engine are cold the alternator charges at a higher rate as the temp and other variables change the alternator lowers the charge accordingly cars that dont use smart charge have a constant voltage to the battery ie 14.4 v smart charge doesnt so it can drop the charge to 13.8 volts as the battery becomes full but will never get to 100 percent its always varied so it will hit 98 percent charged. third the alternator is fed via a fuse in the engine bay which reduces the voltage to the wiring as a result the alternator pulses as the voltage passes through the fuse to the wire .as for the battery you can only use silver calcium or double calcium batteries on smart charge heavy duty lead acid batteries will stop the smart charge working cause electrical faults and can knacker the smart charge regulator and give you headaches they will over charge within a few months halfords etc will sell it as to be used on the ford focus the rest of us know you cant essentially they dont have a clue neither do some garages on smart charge thats why a garage will say youre alternators only charging at 13,8 v its faulty and needs replaced truth is it usually isnt. forget icv valves and batteries etc look at the leads and plugs coil pack as well as the pcv valve which gunks up as well as the hose to the rear of the throttle body which can collapse

#15 johnS

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Posted 29 July 2011 - 08:31 PM

right theres a few things here first off the high electrical load issue thats normal nothing you replace will change this reason is simple the battery is providing the power to these components the alternator is charging the battery at the same time when you slow down and stop a few things happen the alternator for one is now spinning slower so the charge to the battery has now dropped essentially youre using more charge than you are putting in also the ecu is bouncing the revs up and down they dont stay static as the ecu will alter fuelling to get the lowest possible emissions the foci idles at 730+/- 30 rpm thats 670-760 max not 900 like older cars which is why you have that dip. secondly the alternator doesnt stop charging the battery the alternator uses sensors in the engine and ecu that tell what the engine temp is outside temp and battery electrolyte temp as well as charge etc when the battery and engine are cold the alternator charges at a higher rate as the temp and other variables change the alternator lowers the charge accordingly cars that dont use smart charge have a constant voltage to the battery ie 14.4 v smart charge doesnt so it can drop the charge to 13.8 volts as the battery becomes full but will never get to 100 percent its always varied so it will hit 98 percent charged. third the alternator is fed via a fuse in the engine bay which reduces the voltage to the wiring as a result the alternator pulses as the voltage passes through the fuse to the wire .as for the battery you can only use silver calcium or double calcium batteries on smart charge heavy duty lead acid batteries will stop the smart charge working cause electrical faults and can knacker the smart charge regulator and give you headaches they will over charge within a few months halfords etc will sell it as to be used on the ford focus the rest of us know you cant essentially they dont have a clue neither do some garages on smart charge thats why a garage will say youre alternators only charging at 13,8 v its faulty and needs replaced truth is it usually isnt. forget icv valves and batteries etc look at the leads and plugs coil pack as well as the pcv valve which gunks up as well as the hose to the rear of the throttle body which can collapse



Thanks, is this also the reason why I see the engine bay vibrating quite badly with air conditioning etc running, when you turn all these off the engines not vibrating as much. You can feel it a little in the car but only at idle or just above.

I believe this is related, but not sure about this

(sorry for the thread hijack btw)

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