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Model specific boards => Golf mk2 => Topic started by: MacBain on 02 October 2007, 20:17

Title: Throttle lift off = jerking
Post by: MacBain on 02 October 2007, 20:17
I'm having trouble with the car being to sensitive when I lift my foot off the throttle.
If i don't do it extremely carefully the car jerks.
Is there a way to adjust this on a RP mono-jetronic engine?
Title: Re: Throttle lift off = jerking
Post by: Dolly on 02 October 2007, 20:37
is that a digifant 8v? mine does it to, it seems very sensitive to intial throttle movement think having 17 year old engine mounts dont help?.. get a G60 anyhows so its irrelivant  :cool:
Title: Re: Throttle lift off = jerking
Post by: MacBain on 02 October 2007, 20:56
No, it's not a digifant, but a mono-jetronic.
Title: Re: Throttle lift off = jerking
Post by: Simpson on 03 October 2007, 14:55
engine mounts or timing perhaps,  :smiley:
Title: Re: Throttle lift off = jerking
Post by: Grazer on 03 October 2007, 15:12
I have this problem too.
I've just put it down the engine mounts, another job to sort.
Title: Re: Throttle lift off = jerking
Post by: Trigger1002 on 03 October 2007, 16:12
i had this problem and it just needed a good tune up - all ok now!!  :laugh:
Title: Re: Throttle lift off = jerking
Post by: mk2mark on 03 October 2007, 18:33
Probably a loose throttle cable, very easy fix, just take a look at it.
Title: Re: Throttle lift off = jerking
Post by: MacBain on 03 October 2007, 20:26
Probably a loose throttle cable, very easy fix, just take a look at it.
How tight should the throttle cable be?

By the way, this is what I've done so far:

-Checked timing
-Changed the sparkplugs, wires and distributor cap.
-Changed both the intake and exaust gasket (the was a small leak in the intake gasket).
-Changed the entire mono-jetronic injector unit.
-Checked for vacum leak, but couldn't find any.
-Checked all the ground cables, all seem fine.
-Changed the lambda sensor.
-Changed the blue temp sensor.
-Changed the battery.

I know that the catalytic converter has been gutted, but this shouldn't cause any problems, aside from giving the exaust less restriction.

Is changing the engine mounts a difficult job?

The engine seems fine aside from the throttle-lift off jerking. It really accelerates both quickly and smooth, but it's a pain to drive in the city with all the start,stop and slow driving :sad:.
It recently passed the EU test (m.o.t) so I'm planning on keeping it for at least two more years.
All other tips on things to check out is appreciated  :smiley:.
Title: Re: Throttle lift off = jerking
Post by: Lap on 03 October 2007, 22:55
Mine used to jerk about but its a Digifant. It was especially bad if you were say trickling along in traffic in 1st or 2nd gear. It used to buck like a kangaroo every time you applied or removed throttle.

A tune up improved it and a new front engine mount improved it further. Front engine mount was quite easy. Just had to support the engine and unbolt the mount and slide it out. Did have to remove the oil filter though to get better access. I'm sure somebody else will correct me if there is an easier way to do it. 

It still jerks a bit now but I just put it down to it being an old car. I no longer have to use the clutch to smooth it out like I used to though. 
Title: Re: Throttle lift off = jerking
Post by: VeeDubGTI16v on 04 October 2007, 10:35
i reckon its engine mounts too
Title: Re: Throttle lift off = jerking
Post by: MacBain on 04 October 2007, 14:01
Did the test where I tried to drive with the parking brake on and can't say that the engine moved to much.
But, I suppose the engine mounts may still be the cause.
Any other way to check the mounts are ok?
Title: Re: Throttle lift off = jerking
Post by: Ben Lessani on 05 October 2007, 23:32
my pug used to be like this, it was the lower gbox mount, on the golf, the front subframe mount is the likely suspect - but you can usually see play in the engine if someone holds on the handbrake and drops the clutch sharply.

edit: theres also that little spaceship shaped affair which regulates the throttle (iirc) the overrun cutoff valve..? mine doesn't make a different if this line is connected or not, but it might be the case on yours..
Title: Re: Throttle lift off = jerking
Post by: rubjonny on 10 October 2007, 09:15
I have this on mine, tuned all new mounts, bnew throttle cable etc etc still does it.  Been told worn driveshafts can casue it, wouldnt be surprised since they are 177k old now, next thing on me list of things to do!
Title: Re: Throttle lift off = jerking
Post by: jammac on 10 October 2007, 13:05
haha my 8v digi does it to!

just gonna have to accept it if rub jonny hasnt fixed it yet!
Title: Re: Throttle lift off = jerking
Post by: clipperjay on 10 October 2007, 15:15
Can't you jack up the car check the inner CV boots for ware n' tear you can but new CV knuckles for about £40 I think? :undecided: