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Slowly increasing idling in 3L V6 #581734
16/06/19 08:46 PM
16/06/19 08:46 PM
Joined: Dec 2009
Posts: 741
Aerdenhout, The Netherlands
BertR Offline OP
Talk Morgan Regular
BertR  Offline OP
Talk Morgan Regular

Joined: Dec 2009
Posts: 741
Aerdenhout, The Netherlands
Today I noticed that upon taking away my foot from the accelerator ( and pressing the clutch) the revs came down (as normal) but then gradually increased during a few seconds to about 2000 rpm This happened a few times. One time I saw that the rpm slowly came down again. Also, the normal idle was not exactly stable on one occasion. Engine was warm and running fine otherwise. This is on my 3.0 L 3V6 Roadster from 2009. I did not notice this behavior before. I was in traffic and could not experiment any further, also it occurred only a few times.
Any ideas why this happens?
Thx,
Bert


2009 Roadster, Lancia midnight blue, cinnamon upholstery.
Re: Slowly increasing idling in 3L V6 [Re: BertR] #581756
17/06/19 01:33 AM
17/06/19 01:33 AM
Joined: Dec 2018
Posts: 276
C
ChrisConvertible Offline
Learner Plates Off!
ChrisConvertible  Offline
Learner Plates Off!
C

Joined: Dec 2018
Posts: 276
I had the exact same symptoms on my Nissan 180sx and I fixed it by replacing the plug on the wiring harness that connects to the throttle body position sensor.

I hope that helps.

Re: Slowly increasing idling in 3L V6 [Re: BertR] #581757
17/06/19 03:10 AM
17/06/19 03:10 AM
Joined: Nov 2015
Posts: 52
Calif, USA
P
Phil T Offline
Just Getting Started
Phil T  Offline
Just Getting Started
P

Joined: Nov 2015
Posts: 52
Calif, USA
Check the integrity of all the vacuum lines and fittings. A cracked hose can result in unpredictable idling.

regards,
Phil

Re: Slowly increasing idling in 3L V6 [Re: BertR] #581806
17/06/19 12:38 PM
17/06/19 12:38 PM
Joined: Nov 2015
Posts: 2,317
Yorkshire
CooperMan Offline
Talk Morgan Expert
CooperMan  Offline
Talk Morgan Expert

Joined: Nov 2015
Posts: 2,317
Yorkshire
I would start by gently cleaning the Mass Airflow Sensor in some solvent


Jon M
Re: Slowly increasing idling in 3L V6 [Re: BertR] #581923
18/06/19 08:10 AM
18/06/19 08:10 AM
Joined: Jan 2009
Posts: 4,776
howard Offline
Part of the Furniture
howard  Offline
Part of the Furniture

Joined: Jan 2009
Posts: 4,776
The electronic throttle is the place to start. If cars arent used fairly intensively you get problems with the throttle position sensor.

Might sound daft but I'd be inclined to sit in the car in the garage engine off, and depress and release the throttle a hundred times just to make sure it was working as well as it can. On the Lotus there was a procedure for re-calibrating it which I think was no more than ignition on but engine not started and pressing the throttle fully open and fully realeased a couple of times. Ignition off then start the engine.

If the problem persists then garage and diagnosticks.

Re: Slowly increasing idling in 3L V6 [Re: BertR] #581929
18/06/19 09:26 AM
18/06/19 09:26 AM
Joined: Feb 2016
Posts: 2,781
East Harling, Norfolk UK
Richard Wood Offline
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Richard Wood  Offline
Talk Morgan Expert

Joined: Feb 2016
Posts: 2,781
East Harling, Norfolk UK
Throttle shaft partially seizing is another one. Usually triggers management light as well though.


Richard

2018 Roadster - Red/Magnolia - "Morton"
1966 Land Rover series 2a SWB
1960 Velocette Venom
Re: Slowly increasing idling in 3L V6 [Re: BertR] #581982
18/06/19 04:58 PM
18/06/19 04:58 PM
Joined: Jul 2007
Posts: 358
Aberdeen
Andy Offline
Learner Plates Off!
Andy  Offline
Learner Plates Off!

Joined: Jul 2007
Posts: 358
Aberdeen
I have the same problem on my 2011 Roadster. The throttle is still cable controlled on these models. Can anybody explain where to find the MAF sensor?

Re: Slowly increasing idling in 3L V6 [Re: Phil T] #582022
18/06/19 08:27 PM
18/06/19 08:27 PM
Joined: Dec 2009
Posts: 741
Aerdenhout, The Netherlands
BertR Offline OP
Talk Morgan Regular
BertR  Offline OP
Talk Morgan Regular

Joined: Dec 2009
Posts: 741
Aerdenhout, The Netherlands
Originally Posted By Phil T
Check the integrity of all the vacuum lines and fittings. A cracked hose can result in unpredictable idling.

regards,
Phil

Well, I thought that this would be an easy lead, so I checked the lines and found one with a kink in it and corrected it by loosening a near tie wrap. Today I took the Morgan to work for a test drive and I could not reproduce the error. So perhaps... this did the trick.
Thanks for all the follow up!
Bert


2009 Roadster, Lancia midnight blue, cinnamon upholstery.

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