displaying posts 1 to 11 of 11

Author Subject: Stuttering Engine
rudolf

Seasoned Pro

Location: Skelmersdale

Registered: 07 Apr 2004

Posts: 2,769

Status: Offline

Post #1
My car has just passed its MOT so have good emissions, however it has just started uneven running just below 2000RPM and on idle.

Any ideas on if a sensor is at fault?

________________________________________

S Reg Diablo standardsSpec SORNED
R Reg Nile standard spec written off then repaired
X Reg Astor in need of TLC
R Reg Nile to restore
Set of Lions to fit.
Posted 22nd Jun 2018 at 21:54
blandy

Seasoned Pro

Location: Bucks

Registered: 25 Feb 2007

Posts: 2,437

Status: Offline

Post #2
Try cleaning Or replacing the idle control valve
Posted 22nd Jun 2018 at 22:05
rudolf

Seasoned Pro

Location: Skelmersdale

Registered: 07 Apr 2004

Posts: 2,769

Status: Offline

Post #3
I've changed it recently and also repaired the ECU loom to it.

Why would it affect running above idle?

________________________________________

S Reg Diablo standardsSpec SORNED
R Reg Nile standard spec written off then repaired
X Reg Astor in need of TLC
R Reg Nile to restore
Set of Lions to fit.
Posted 22nd Jun 2018 at 22:07
barrym

Senior User

Location: Westcliff-on-sea

Registered: 26 Jun 2014

Posts: 502

Status: Offline

Post #4
sounds like a possible lambda problem

________________________________________

China D Turbo HDi daily charger
Black Rallye occassional toy
Posted 22nd Jun 2018 at 22:54
rudolf

Seasoned Pro

Location: Skelmersdale

Registered: 07 Apr 2004

Posts: 2,769

Status: Offline

Post #5
Anyone got one in the North West?

________________________________________

S Reg Diablo standardsSpec SORNED
R Reg Nile standard spec written off then repaired
X Reg Astor in need of TLC
R Reg Nile to restore
Set of Lions to fit.
Posted 22nd Jun 2018 at 22:58
mocinim

Seasoned Pro

Location: The Darkside of bedford :)

Registered: 09 Jan 2015

Posts: 2,307

Status: Offline

Post #6
Look for air leaks at the intake manifold and the throttle body

________________________________________

BLACK RALLYE - phoenix
WHITE RALLYE - valliant

http://public.servicebox.peugeot.com/

https://www.gov.uk/check-mot-history
Posted 23rd Jun 2018 at 01:04
pug_306

Seasoned Pro

Location: Great Hockham

Registered: 28 May 2013

Posts: 1,593

Status: Offline

Post #7
quote:
[quote="barrym"]sounds like a possible lambda problem


I would try unplugging it see if it makes a difference.

________________________________________

1998 Supercharged White Rallye
1992 205 GTi6
205 Turbo 340bhp
Posted 23rd Jun 2018 at 07:42
miki4

Regular

Location: Cologne

Registered: 09 Nov 2015

Posts: 389

Status: Offline

Post #8
quote:
quote:
sounds like a possible lambda problem


I would try unplugging it see if it makes a difference.



Ditto. Otherwise it could also be ignition related (most probably failing coil pack).
Posted 23rd Jun 2018 at 14:11
Rich E Forum Admin

Location: Hertfordshire

Registered: 27 Apr 2005

Posts: 7,757

Status: Offline

Post #9
Unplugging the lambda sensor forces the ECU to switch to open loop fuelling so it doesn’t really help to conclusively prove the fault is with the lambda sensor. The fault could be elsewhere and the change in fuelling masks the problem, plus the recent MOT pass would suggest the lambda sensor is working correctly.

Throttle position sensor (and wiring) is also a potential culprit for hesitation, engine speed stability and stuttering issues.

Oh, and try an ECU reset... while there's a lot of old wives tales about false benefits of doing this it does do one useful thing - it resets the ICV back to it's home position when the ignition is next turned on. The true ICV position isn't tracked by the ECU. It's just assumed to be in the last position the ECU remembers.

________________________________________

Rich
Posted 23rd Jun 2018 at 14:26
fatlapit

Seasoned Pro

Location: STOCKSFIELD

Registered: 02 Nov 2010

Posts: 3,040

Status: Offline

Post #10
Injectors

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Posted 23rd Jun 2018 at 17:32
rudolf

Seasoned Pro

Location: Skelmersdale

Registered: 07 Apr 2004

Posts: 2,769

Status: Offline

Post #11
quote:
[quote="Rich E"]Unplugging the lambda sensor forces the ECU to switch to open loop fuelling so it doesn’t really help to conclusively prove the fault is with the lambda sensor. The fault could be elsewhere and the change in fuelling masks the problem, plus the recent MOT pass would suggest the lambda sensor is working correctly.

Throttle position sensor (and wiring) is also a potential culprit for hesitation, engine speed stability and stuttering issues.

Oh, and try an ECU reset... while there's a lot of old wives tales about false benefits of doing this it does do one useful thing - it resets the ICV back to it's home position when the ignition is next turned on. The true ICV position isn't tracked by the ECU. It's just assumed to be in the last position the ECU remembers.


Thanks Rich

Doesn't the ICV just move until the idle is correct?

I did change the TPS when I last had idle problems and found the ICV wiring faulty.

I'm beginning to suspect the wiring as I can't read ECU fault codes either.

Anyone got a spare engine loom for an early phase 2?

________________________________________

S Reg Diablo standardsSpec SORNED
R Reg Nile standard spec written off then repaired
X Reg Astor in need of TLC
R Reg Nile to restore
Set of Lions to fit.
Posted 24th Jun 2018 at 09:38

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