Clutch pedal guru
Join Date: 10th April 2011
Location: Doncaster, UK
Thanked 707 Times in 564 Posts
Civic 2.2 revs dropping below idle speed when stopping at junction
I'm hoping one of you guys will have the solution to the grief I've been having with my 2.2 recently.
I start the engine from cold, it starts instantly and settles to a perfect idle. I drive the car 50m to a junction, come to a stop and the revs dip to 500rpm as though the engine is going to stall then the revs pick up to 850rpm idle speed.
It does this whether the gearbox is in neutral or clutch dipped so its not clutch drag.
It still does this when warm but the revs only drop to about 700rpm so much less noticeable.
So far I've cleaned, MAF and MAP sensors, replaced the fuel filter, cleaned and tested the EGR. Also unplugged MAF and MAP sensors, plugged EGR and the car still behaves the same.
Farqui brought me an injector leakback test kit, the injectors seem fine to me. No problems with a particular one- see pic.
The car drives PERFECT off idle.
Also checked APP (throttle pedal) using the HDS and the fuel pressure at idle is 300bar- on target.
Can see nothing abnormal externally on the engine. No vac pipes or boost pipes loose.
No check engine light.
Oh and thanks to Jon who's been helping me via PM