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Uneven idle
Posted: Fri Jun 07, 2019 9:10 pm
by mixers123
2002 petrol 2l
When engine warms up idle speed fluctuates to the point of cutting out.
Any help would be much appreciated ....thanks
Re: Uneven idle
Posted: Fri Jun 07, 2019 9:50 pm
by g8dhe
Could be several reasons but distributor arm, cap, leads and also fuel and air filters can also be the cause.
Re: Uneven idle
Posted: Sat Jun 08, 2019 8:27 am
by Flanners
Had this on my 2.0L someone had previously messed about with screw at the bottom of the TB which alters the air fuel mixture and should not be touched, there are posts on here documenting how to sort it by 'locking out the ecu' while adjusting the revs with the screw. Failing that possible vacumn leak or oil/carbon deposits in the TB/butterfly, can be cleaned out. Check the accelerator cable is not sticking and has some 'slack' to allow the TB to close etc.
Re: Uneven idle
Posted: Sat Jun 08, 2019 9:10 am
by teenmal
Always worth checking the air clack vale in the fuel cap, or try the vehicle with the cap off or really loose.
Re: Uneven idle
Posted: Sat Jun 08, 2019 9:44 am
by mikeonb4c
Flanners wrote: Sat Jun 08, 2019 8:27 am
Had this on my 2.0L someone had previously messed about with screw at the bottom of the TB which alters the air fuel mixture and should not be touched, there are posts on here documenting how to sort it by 'locking out the ecu' while adjusting the revs with the screw. Failing that possible vacumn leak or oil/carbon deposits in the TB/butterfly, can be cleaned out. Check the accelerator cable is not sticking and has some 'slack' to allow the TB to close etc.
In case its needed, is this the relevant post?
viewtopic.php?f=3&t=73643
What is a TB btw - been racking my brain cell to no avail
Re: Uneven idle
Posted: Sat Jun 08, 2019 10:25 am
by Flanners
TB is the Throttle Body
Yes that is the post, good searching!
Re: Uneven idle
Posted: Sat Jun 08, 2019 7:34 pm
by mixers123
Throttle body has been changed ,
did find 1 spark plug loose and HT lead going to that plug very hot , hotter than the other 3
, also recently fitted K&N air filter .
Re: Uneven idle
Posted: Sun Jun 09, 2019 11:57 am
by Flanners
Why was the TB changed, was this changed in the quest for stabilising the revs?
Re: Uneven idle
Posted: Sun Jun 09, 2019 12:06 pm
by Flanners
teenmal wrote: Sat Jun 08, 2019 9:10 am
Always worth checking the air clack vale in the fuel cap, or try the vehicle with the cap off or really loose.
That is sound advice and helped mine no end
Clarification thread from 2012:
viewtopic.php?t=55369
Re: Uneven idle
Posted: Sun Jun 09, 2019 2:36 pm
by mixers123
Yes throttle body was changed to try and solve this problem
So far TB changed
Plugs tightened
Awaiting HT leads
District & rotor arm changed
K&N removed original air filter back in
Petrol cap loosened
As I said only when warm almost to the exact 10mins idling