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#559201 - 11/02/19 04:47 PM Poor idling
drk Offline
L - Learner Plates On

Registered: 29/06/14
Posts: 131
Loc: Italy
Today I decide to go to have a Mot test. I didn't use my 3w for a very long time but it started fine. After 5 minutes of idling it starts to idling very bad. Like 1 cylinder was missing. I cut off the engine and get back into the garage. I just buy new spark plugs and tomorrow I will put new gasoline in the tank. No engine light. The engine start fine but the idling is very bad and it I push the throttle the engine doesn't run fine. Fuel pump noise seems fine. Any thoughts ?
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Morgan 4/4, Lotus Elise s1, Caterham Seven, Ginetta G27, M3W

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#559202 - 11/02/19 05:06 PM Re: Poor idling [Re: drk]
RedThree Online   content

Talk Morgan Expert

Registered: 23/10/12
Posts: 2035
Loc: Furry Boots City
First thought would be a loose spark plug cap - the screwed on nipples on the top of the plugs are prone to loosening off which can give the kind of symptoms you describe. Tighten them up with a pair of pliers then get the plug caps back on securely and try again.
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#559207 - 11/02/19 05:21 PM Re: Poor idling [Re: drk]
drk Offline
L - Learner Plates On

Registered: 29/06/14
Posts: 131
Loc: Italy
Hi Calum. thank you for your suggestion. I just put 2 new spark plugs and it seems to idle fine. Tomorrow in the morning I will check if it's all ok also after some minutes with engine on . Thank you for your aid
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Morgan 4/4, Lotus Elise s1, Caterham Seven, Ginetta G27, M3W

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#559224 - 11/02/19 06:11 PM Re: Poor idling [Re: drk]
Q8morgan Offline
Has a lot to Say!

Registered: 07/07/13
Posts: 1283
Loc: Kuwait
Does it have the urban cooling? If not it might have heated and went into safe mode.

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#559230 - 11/02/19 06:18 PM Re: Poor idling [Re: drk]
Bitsobrits Offline
Just Getting Started

Registered: 16/02/18
Posts: 71
Loc: SW Iowa, U.S.A.
An additional possibility:

I believe it's possible that after "5 minutes of idling" that the engine could get hot enough to activate the "skip fire" mode wherein the engine fires alternatively on one cylinder then the other.

Air cooled engines are generally not happy to idle for extended periods unless there is some sort of significant, external airflow.
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2012 M3W #458
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#559246 - 11/02/19 08:12 PM Re: Poor idling [Re: drk]
Michael H Offline
Has a lot to Say!

Registered: 29/04/13
Posts: 1117
Loc: Southern Vermont
I had the exact same symptoms. One of the nipples had loosened. Tightened it as much as I could while on the road. Later I took the nipples off, added a bit of hi-temp loctite then while tightening everything back down I crimped the nipples hard! Those are not coming off for anyone.

Problems went away.
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What's your mileage? Who cares. Is it practical? See #1. What happens when it rains? You get wet.

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#559257 - 11/02/19 08:41 PM Re: Poor idling [Re: drk]
drk Offline
L - Learner Plates On

Registered: 29/06/14
Posts: 131
Loc: Italy
Thank you all for your help. Tomorrow I will check any suggestions. I hope I will mot my 3w soon. Thank you all for your aid
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Morgan 4/4, Lotus Elise s1, Caterham Seven, Ginetta G27, M3W

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