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Sticky Throttle - M3W #595712
18/09/19 10:29 PM
18/09/19 10:29 PM
Joined: Mar 2019
Posts: 4
Sheffield, UK
B
Birchenall Offline OP
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Birchenall  Offline OP
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Posts: 4
Sheffield, UK
Starting this morning and perhaps getting slightly worse throughout the day I have what I would describe as a sticky throttle.

I noticed this morning that I appeared to have cruse control after the car continued forward at around 30mph without my foot on the accelerator. This continued when I stopped at traffic lights with the engine on a high rev idle with the clutch pedal down.

A quick blip of the accelerator tends to sort it.

I would really like to sort this out myself as I'm a long way from a Morgan Dealer. (Sheffield) Where do I start!? A bit of lubricant on a cable somewhere I presume?

The car is around a year old with roughly 2k miles. I've not done much to it other than move the pedals back a few weeks after I got it last spring.

Re: Sticky Throttle - M3W [Re: Birchenall] #595718
18/09/19 11:01 PM
18/09/19 11:01 PM
Joined: Jan 2017
Posts: 547
Oxford
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ShaunD Offline
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ShaunD  Offline
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Oxford
I had the same problem. If I recall rightly, I think there was a spring involved and it had broken and needed replacing.

Re: Sticky Throttle - M3W [Re: Birchenall] #595722
18/09/19 11:26 PM
18/09/19 11:26 PM
Joined: Jun 2012
Posts: 1,152
United Kingdom, Lincolnshire
planenut Offline
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United Kingdom, Lincolnshire

A frayed throttle cable maybe, or lubrication if it is actually sticking? Also a faulty idle air control motor or wheel speed sensor will hold the revs higher than normal.

Re: Sticky Throttle - M3W [Re: ShaunD] #595736
19/09/19 07:43 AM
19/09/19 07:43 AM
Joined: May 2011
Posts: 1,014
Near Windsor Berkshire
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Rog G Offline
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Originally Posted by ShaunD
I had the same problem. If I recall rightly, I think there was a spring involved and it had broken and needed replacing.

Return spring on the throttle pedal.


2013 M3W
1971 4/4 2 Seater
1934 Sports
Re: Sticky Throttle - M3W [Re: Birchenall] #595749
19/09/19 09:09 AM
19/09/19 09:09 AM
Joined: Mar 2014
Posts: 878
Leicestershire, UK
Bunny Offline
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Bunny  Offline
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Leicestershire, UK
I've heard of throttle cables 'sticking' a couple of times recently. Does anyone lubricate the cable as part of their preventative maintenance?

Last edited by Bunny; 19/09/19 09:10 AM.

Andy
Re: Sticky Throttle - M3W [Re: Birchenall] #595762
19/09/19 11:10 AM
19/09/19 11:10 AM
Joined: Jul 2019
Posts: 45
Sweden
Swedewheeler Offline
Just Getting Started
Swedewheeler  Offline
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Posts: 45
Sweden
I had my throttle cable touching the cylinder and melted just enough to get the throttle to stick from time to time.....it was quite interesting to drive sometimes until I found the problem..:-)

Re: Sticky Throttle - M3W [Re: Birchenall] #595772
19/09/19 12:29 PM
19/09/19 12:29 PM
Joined: Jul 2013
Posts: 2,779
West Sussex, UK
Chris99 Offline
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Chris99  Offline
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Posts: 2,779
West Sussex, UK
Bear in mind that if the throttle is stuck slightly open then the car won't start.


Red Leader drive
Re: Sticky Throttle - M3W [Re: Chris99] #595774
19/09/19 12:31 PM
19/09/19 12:31 PM
Joined: Feb 2019
Posts: 1,225
West of Seattle, USA
LightSpeed Offline
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Originally Posted by Chris99
Bear in mind that if the throttle is stuck slightly open then the car won't start.


That is an interesting and useful fact.


Stephen
2019 M3W

Re: Sticky Throttle - M3W [Re: Birchenall] #595777
19/09/19 12:46 PM
19/09/19 12:46 PM
Joined: Nov 2015
Posts: 1,325
Yorkshire
CooperMan Offline
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Originally Posted by Birchenall
Starting this morning and perhaps getting slightly worse throughout the day I have what I would describe as a sticky throttle.

I noticed this morning that I appeared to have cruse control after the car continued forward at around 30mph without my foot on the accelerator. This continued when I stopped at traffic lights with the engine on a high rev idle with the clutch pedal down.

A quick blip of the accelerator tends to sort it.

I would really like to sort this out myself as I'm a long way from a Morgan Dealer. (Sheffield) Where do I start!? A bit of lubricant on a cable somewhere I presume?

The car is around a year old with roughly 2k miles. I've not done much to it other than move the pedals back a few weeks after I got it last spring.


Birchenall, if you want some help or an extra pair of hands, give me a shout (via PM) as I'm Mog tinkering this weekend & located in the 'Peoples Republic of South Yorks'


Jon M
Re: Sticky Throttle - M3W [Re: Rog G] #595865
19/09/19 09:35 PM
19/09/19 09:35 PM
Joined: Jan 2017
Posts: 547
Oxford
S
ShaunD Offline
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ShaunD  Offline
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Posts: 547
Oxford
Originally Posted by Rog G
Originally Posted by ShaunD
I had the same problem. If I recall rightly, I think there was a spring involved and it had broken and needed replacing.

Return spring on the throttle pedal.

Thanks, Rog. Yes, that was it!

Re: Sticky Throttle - M3W [Re: Birchenall] #595876
20/09/19 03:44 AM
20/09/19 03:44 AM
Joined: Feb 2018
Posts: 210
SW Iowa, U.S.A.
Bitsobrits Offline
L - Learner Plates On
Bitsobrits  Offline
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Joined: Feb 2018
Posts: 210
SW Iowa, U.S.A.
I found my throttle pedal itself was dragging a bit, creating a high idle speed on occasion. Turns out it just need a bit of lubrication at the pivot point, which is fairly hard to do as there is no apparent hole to allow oil to flow into the pivot area, and it's darned hard to reach the pedal from the seat area.


Steve
2012 M3W #458
SW Iowa

Re: Sticky Throttle - M3W [Re: Birchenall] #595917
20/09/19 11:16 AM
20/09/19 11:16 AM
Joined: Feb 2019
Posts: 1,225
West of Seattle, USA
LightSpeed Offline
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West of Seattle, USA
The footwells are deep dark hole that might as well be safe storage lockers because getting in there is nigh impossible. Sort of like a Chinese Finger Trap, once you get in there is no way out, and god forbid you get a muscle cramp while down in the hole⛑. Medics might be involved.


Stephen
2019 M3W

Re: Sticky Throttle - M3W [Re: Bitsobrits] #595942
20/09/19 02:52 PM
20/09/19 02:52 PM
Joined: Jun 2012
Posts: 1,152
United Kingdom, Lincolnshire
planenut Offline
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United Kingdom, Lincolnshire

Originally Posted by Bitsobrits
there is no apparent hole to allow oil to flow into the pivot area, and it's darned hard to reach the pedal from the seat area.


There is an access panel on the top of the footwell, under the cowl. It's not great but it does help a little to get at things on the pedal box.

Re: Sticky Throttle - M3W [Re: Birchenall] #596006
20/09/19 11:34 PM
20/09/19 11:34 PM
Joined: Feb 2018
Posts: 210
SW Iowa, U.S.A.
Bitsobrits Offline
L - Learner Plates On
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Joined: Feb 2018
Posts: 210
SW Iowa, U.S.A.
Yes, know that well. Have had that off several times, for various reasons. Doesn't really help with the pedal pivot lube as it's too far forward. Really wish Morgan had made that access panel much larger, say the entire area above the pedal box.


Steve
2012 M3W #458
SW Iowa

Re: Sticky Throttle - M3W [Re: Birchenall] #596008
21/09/19 12:32 AM
21/09/19 12:32 AM
Joined: Feb 2019
Posts: 1,225
West of Seattle, USA
LightSpeed Offline
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West of Seattle, USA
I have not removed that access panel but why could you not make a larger panel and cut a bigger hole? I did that in a VW Bug to access the starter from above. Made a world of difference in keeping it running on gravel roads.


Stephen
2019 M3W

Re: Sticky Throttle - M3W [Re: Birchenall] #596009
21/09/19 12:51 AM
21/09/19 12:51 AM
Joined: Feb 2018
Posts: 210
SW Iowa, U.S.A.
Bitsobrits Offline
L - Learner Plates On
Bitsobrits  Offline
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Joined: Feb 2018
Posts: 210
SW Iowa, U.S.A.
Sorting the design of he brake hose routing is the primary reason I haven't yet made a larger access panel. To make a tidy installation, I'm thinking I would like to route the brake hoses straight down from the reservoir, and through the ledge next to the new panel. Time to take the pedal box out for a complete clean and lube anyway, so a job for this winter I think.


Steve
2012 M3W #458
SW Iowa

Re: Sticky Throttle - M3W [Re: Bitsobrits] #596011
21/09/19 12:53 AM
21/09/19 12:53 AM
Joined: Feb 2019
Posts: 1,225
West of Seattle, USA
LightSpeed Offline
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West of Seattle, USA
Haven’t really looked at it yet but that makes sense.


Stephen
2019 M3W

Re: Sticky Throttle - M3W [Re: Birchenall] #596022
21/09/19 07:03 AM
21/09/19 07:03 AM
Joined: Jun 2015
Posts: 397
Tourtour, France and Lewes, UK
WilsonLaidlaw Offline
Learner Plates Off!
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Joined: Jun 2015
Posts: 397
Tourtour, France and Lewes, UK
I had the same thing a few weeks ago. All the return springs were good as was the cable (no melted bits). A healthy application of silicone/teflon spray lubricant (RS Components) on the bottom of the pedal area and at the linkage on the EFI did the trick.

Wilson

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