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+--- Thread: Engine hesitation, low revs... (/showthread.php?tid=16281)
Engine hesitation, low revs... - C.A.R. - 08-08-2013
HDi, ProSteve map, de-egr'd (blanked & unplugged) otherwise standard.
The car has started doing this little hesitation thing, where it will feel almost like a missfire jolting forwards in pulsing bursts, around 2000-ish rpm when pootling around town @ 30 ish.
What could that be?
Car is overdue a service which I'm carrying out this weekend (hopefully) I wondered if there were any sensors I could clean at the same time?
RE: Engine hesitation, low revs... - tigerstyle - 08-08-2013
In the guides section there is a good FAQ for this.
TPS or FPS I recall are the first points to look at.
RE: Engine hesitation, low revs... - C2K - 08-08-2013
Has the idle risen at all? Clean your TPS plug.
RE: Engine hesitation, low revs... - C.A.R. - 08-08-2013
Idle seems indifferent.
I'll look in the FAQ...Guessing the TPS is on the throttle butterfly like it is on a petrol?
RE: Engine hesitation, low revs... - Ricky - 08-08-2013
I need to sort mine out to, doesn't like driving at 30 in 3rd.
The sensor is on the part where the end of the cable attaches to by the airbox I'm guessing.
RE: Engine hesitation, low revs... - Toms306 - 08-08-2013
There is no throttle butterfly on a diesel Chris.
As Ricky says, follow the throttle cable to the front of the engine. The TPS is bolted to the side of the airbox.
RE: Engine hesitation, low revs... - DeeTurbo - 08-08-2013
If the car has a doser (2001 and newer) and that isn't disconnected that would cause the same symptom especially if the EGR is disabled.
RE: Engine hesitation, low revs... - Poodle - 08-08-2013
Could do if he didn't ask Steve to map it out.
RE: Engine hesitation, low revs... - C.A.R. - 09-08-2013
It is 2001 Y-reg. WTF is an air-doser?
Sorry for the Noob-ish response!
RE: Engine hesitation, low revs... - DeeTurbo - 09-08-2013
On the 2001 and newer the doser is fitted to the bottom of the elbow that bolts to the inlet manifold.
The doser is like a throttle butterfly but it only close at idle so more exhaust gasses can be sucked into the engine.
If it goes faulty it can close by its self causing the car to bog down and even stall.
There is a vacuum solenoid near the egr one that controls it.
On my girlfriends 206 HDI I've removed the doser and replaced it with one from Toms car because the doser it's self is a bit restrictive.
RE: Engine hesitation, low revs... - C.A.R. - 09-08-2013
Ah I see. Does anyone have a photograph so I can see what I'm looking for?
RE: Engine hesitation, low revs... - DeeTurbo - 09-08-2013
Have a look in the guide section for the egr and it'll show you the vacuum solenoid pipe that needs blocking off.
Just thought did you unplug the egr solenoid plug before up loading the map?
RE: Engine hesitation, low revs... - Poodle - 09-08-2013
To the best of my knowledge, the air-doser and egr work in conjunction under low-load, cruising conditions, hence you getting the jerkiness at about 2000rpm and partial throttle.