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Revs not going to idle #657755
22/08/20 12:26 PM
22/08/20 12:26 PM
Joined: Apr 2012
Posts: 1,639
Dumfries and Galloway
donaldosaurus Offline OP
Talk Morgan Enthusiast
donaldosaurus  Offline OP
Talk Morgan Enthusiast

Joined: Apr 2012
Posts: 1,639
Dumfries and Galloway
Hello fellow three wheelers,

I am noticing a reluctance for engine to reduce to idle. When changing gear it does not reduce revs despite throttle being lifted off. Stranger still I stopped after a run and was still at 3000 revs.

Only done 400 miles and I remember early cars had throttle cable with a big bend above engine but maybe the cowl for fan modification causes a poor route?


2022 Plus Four, Range Rover Vogue SDV8, Lotus Elan.
Re: Revs not going to idle [Re: donaldosaurus] #657805
22/08/20 04:14 PM
22/08/20 04:14 PM
Joined: Feb 2018
Posts: 607
SW Iowa, U.S.A.
Bitsobrits Offline
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Bitsobrits  Offline
Talk Morgan Regular

Joined: Feb 2018
Posts: 607
SW Iowa, U.S.A.
Cable routing, unless done with insufficient radii, is unlikely to be the culprit, as if done wrong it would have been apparent from day 1.

Don't discount a sticking throttle pedal. The non sealed footwells and under dash area of the M3W allow all sorts of dust and debris into the pedal area.

After a newly developed issue this spring with a slightly high (1200-1400rpm) idle, a bit of sleuthing revealed the throttle cable had zero slack at the throttle body (there should be just a small but discernible amount) and traced the issue back to a sticking pedal. A bit of spray oil at the pedal pivot later, the pedal was freed off and normal idle returned.

One of my many winter projects this year will be to remove and clean/plate/repaint the pedal assembly and see if I can't come up with simple mods to facilitate periodic lubrication of the pedal pivots without standing on ones head.

Last edited by Bitsobrits; 22/08/20 04:15 PM.

Steve
Late 2012 M3W




Re: Revs not going to idle [Re: donaldosaurus] #657809
22/08/20 04:34 PM
22/08/20 04:34 PM
Joined: Jun 2012
Posts: 1,897
United Kingdom, Lincolnshire
planenut Offline
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planenut  Offline
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Joined: Jun 2012
Posts: 1,897
United Kingdom, Lincolnshire

If the throttle cable seems to be working correctly the problem could be with the Idle Air Control. It sits on the top of the throttle body with a plug going to it. They can be cleaned but that is unlikely to be the problem with your almost new car and it will be a back to the dealer job for warranty work I expect.

Re: Revs not going to idle [Re: donaldosaurus] #657866
23/08/20 12:34 AM
23/08/20 12:34 AM
Joined: Jan 2019
Posts: 12
Georgia, USA
TheScottFraser Offline
New to Talk Morgan
TheScottFraser  Offline
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Joined: Jan 2019
Posts: 12
Georgia, USA
I agree with above. Start by cleaning the idle air control valve and the passage in the throtle body it sits in. I use q-tips to clean this so I don't spray crap down the i take into the engine.

Re: Revs not going to idle [Re: donaldosaurus] #657871
23/08/20 01:57 AM
23/08/20 01:57 AM
Joined: May 2019
Posts: 52
B
Bluebricked Offline
Just Getting Started
Bluebricked  Offline
Just Getting Started
B

Joined: May 2019
Posts: 52
I also have this problem on occasion. Except with my car the idle is a bit higher than normal and rougher and occurs both at the stoplight or when shifting gears. A blip of the throttle usually works to calm it down at the stoplight.

So it sounds like I need to check the throttle cable slack, gas pedal pivot point, and clean or replace the idle air control valve.

Re: Revs not going to idle [Re: donaldosaurus] #657972
23/08/20 02:17 PM
23/08/20 02:17 PM
Joined: Apr 2012
Posts: 1,639
Dumfries and Galloway
donaldosaurus Offline OP
Talk Morgan Enthusiast
donaldosaurus  Offline OP
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Joined: Apr 2012
Posts: 1,639
Dumfries and Galloway
Many thanks for input. Pedal seems to move smoothly. Cleaned sensor. Not much slack in cable. Still the same. Frustrated


2022 Plus Four, Range Rover Vogue SDV8, Lotus Elan.
Re: Revs not going to idle [Re: Bluebricked] #657978
23/08/20 02:29 PM
23/08/20 02:29 PM
Joined: Jul 2013
Posts: 3,346
West Sussex, UK
Chris99 Offline
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Chris99  Offline
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Joined: Jul 2013
Posts: 3,346
West Sussex, UK
Originally Posted by Bluebricked
I also have this problem on occasion. Except with my car the idle is a bit higher than normal and rougher and occurs both at the stoplight or when shifting gears. A blip of the throttle usually works to calm it down at the stoplight.

So it sounds like I need to check the throttle cable slack, gas pedal pivot point, and clean or replace the idle air control valve.


Mine had similar symptoms - turned out to be a frayed throttle cable at the throttle body end causing the throttle to stick open slightly.

If it is this and it gets worse then eventually the throttle will stick open and once you switch the engine off and try to restart it the fuel pump will run, the engine will turn over but it won't fire up.


Red Leader drive
Re: Revs not going to idle [Re: donaldosaurus] #658048
23/08/20 10:15 PM
23/08/20 10:15 PM
Joined: Feb 2018
Posts: 607
SW Iowa, U.S.A.
Bitsobrits Offline
Talk Morgan Regular
Bitsobrits  Offline
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Joined: Feb 2018
Posts: 607
SW Iowa, U.S.A.
Two more ideas:

verify the cable is properly routed at the throttle body. If the throttle is opened manually for a cleaning or inspection, the cable can come out of the groove in the 'disc' on the side of the throttle body.

when the high idle situation occurs, shut off the machine and without touching the throttle, remove the air cleaner to inspect the position of the throttle plate (which should be totally closed).


Steve
Late 2012 M3W




Re: Revs not going to idle [Re: donaldosaurus] #660273
04/09/20 12:02 PM
04/09/20 12:02 PM
Joined: Apr 2012
Posts: 1,639
Dumfries and Galloway
donaldosaurus Offline OP
Talk Morgan Enthusiast
donaldosaurus  Offline OP
Talk Morgan Enthusiast

Joined: Apr 2012
Posts: 1,639
Dumfries and Galloway
I thought it was throttle cable but dealer found sticky butterfly valve . Replacement cable still not arrived from MMC!

G56 wings arrived today!!!


2022 Plus Four, Range Rover Vogue SDV8, Lotus Elan.
Re: Revs not going to idle [Re: donaldosaurus] #660278
04/09/20 12:28 PM
04/09/20 12:28 PM
Joined: Feb 2019
Posts: 3,639
Port Orchard, WA.
LightSpeed Offline
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LightSpeed  Offline
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Joined: Feb 2019
Posts: 3,639
Port Orchard, WA.
Sticky throttle body probably from oil/gunk being pumped into the throttle body from the cam chest vent tube.

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