Car jerking when rolling at idle

BigTom · Post by **BigTom** » Tue Oct 08, 2013 3:55 pm

Hi all,

Noticed recently while creeping through some motorway traffic that the car (5th 2.2) jerks a bit while rolling forwards in 1st with just the idle revs. This doesn't happen when the engine is cold and the idle is around 1100rpm, but when it warms up and drops to 700rpm then it jerks.

Should I just adjust the idle upwards a bit on the throttle body, or is there something else I should look at first?

Cheers,
Tom

bb1boy · Post by **bb1boy** » Tue Oct 08, 2013 4:49 pm

Clutch issues maybe?

Post by **si import** » Tue Oct 08, 2013 7:01 pm

Are the revs bouncing up and down on tick over ?

BigTom · Post by **BigTom** » Tue Oct 08, 2013 7:08 pm

si import wrote:Are the revs bouncing up and down on tick over ?

Nope, the revs are nice and stable, both warm and cold

The "S" express · Post by **honda-hardy** » Tue Oct 08, 2013 11:14 pm

check the fitv valve. as you look at the inlet manifold whilst standing at the front of the car. its just behind the distributor.

undo the 2 screws on the cover with a stumpy screwdriver.

i tightened mine using a screwdriver on on of the slots.

Post by **RattyMcClelland** » Tue Oct 08, 2013 11:27 pm

Unplug the idle air control valve when warm and see if there is a change.

h10ndr · Post by **h10ndr** » Tue Oct 08, 2013 11:37 pm

700rpm is at stall point - too low revs to creep in traffic. There is a point when the engine is running too slow and the jerking

begins... about 1000rpm is about the lowest I can go in traffic with clutch engaged...

mercutio · Post by **mercutio** » Wed Oct 09, 2013 10:29 pm

should be able to creep at idle the auto manages it so adjust your idle a little to 750 or 850

Post by **Kawa** » Wed Oct 09, 2013 10:54 pm

Mine did this for a while. Sorting the EGR system seemed to sort it out.

89 UKDM BA4 4WS (resto job!) · Post by **wurlycorner** » Thu Oct 10, 2013 9:37 am

Also check your front/rear engine mounts...