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tow bar
by G Walker - 24/08/26 06:52 PM
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Forums39
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Jun 14th, 2026
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Joined: Apr 2012
Posts: 1,653
Talk Morgan Enthusiast
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OP
Talk Morgan Enthusiast
Joined: Apr 2012
Posts: 1,653 |
Could well be, car has sat for a year or so before I got it. Raining now but not for long I hope. Now when weather is nice I’m cycling 300 miles this month for Cancer Research . Fundraising going well but sore ar5e!! https://fundraise.cancerresearchuk.org/page/ians-cycle-300-fundraising-page-171Raffling a 4.5 litre bottle of Really Big Peat too.
2022 Plus Four, 2023 Super Three, Range Rover Vogue SDV8 and Triking T3.
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Joined: Apr 2021
Posts: 99 Likes: 5
Just Getting Started
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Just Getting Started
Joined: Apr 2021
Posts: 99 Likes: 5 |
Hey all, similar issue at the moment, rpm remains high during gear changes and on stopping sometimes takes time for rpm to decay to idle. Definitely worse when engine is hot. (Ambient temp was 14 degrees C so not exactly a hot day!) Throttle cable moving freely, hard to tell if the butterfly is sticking while driving but when moved by pressing with my thumb it returns strongly to the closed position...I have cleaned the idle air control valve which was gunky and still has some baked on black stuff that has not wiped off. Will see how the next drive goes...
M3W 2017 Sport blue.
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Joined: Apr 2013
Posts: 1,370 Likes: 11
Has a lot to Say!
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Has a lot to Say!
Joined: Apr 2013
Posts: 1,370 Likes: 11 |
This happened to me last year. The spring behind the gas pedal broke. The spring at the top of the motor is not strong enough to do the job itself. I replaced the. lower spring with a 'close enough' spring and life resumed like normal. It is a pain to do as you have to go through the access hole above the assembly and hope your wrist and fingers are flexible and strong enough to do the job.
What's your mileage? Who cares. Is it practical? See #1. What happens when it rains? You get wet.
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Joined: May 2019
Posts: 79 Likes: 3
Just Getting Started
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Just Getting Started
Joined: May 2019
Posts: 79 Likes: 3 |
I have been chasing a similar problem for a while. The engine sometimes took some time to return to idle at a stop and between shifts things could get lumpy as the engine hunted around for what RPM it really wanted to be at. Finally found the right guy who was a former S&S-sponsored racer who said my TPS (Throttle Position Sensor) needed to be adjusted. He manually adjusted the sensor while watching the readouts on the S&S software and my car is back to a perfect tune. I guess there are throttle stops that wear over time and can throw things kind of out of wack. You can't visually confirm anything is worn, because the throttle snapped back and close perfectly. Except my RPMs were not decaying to an idle and RPMs sometimes remained high between shifts. Hope this helps.
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Joined: Feb 2019
Posts: 3,857 Likes: 2
Talk Morgan Addict
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Talk Morgan Addict
Joined: Feb 2019
Posts: 3,857 Likes: 2 |
I have been chasing a similar problem for a while. The engine sometimes took some time to return to idle at a stop and between shifts things could get lumpy as the engine hunted around for what RPM it really wanted to be at. Finally found the right guy who was a former S&S-sponsored racer who said my TPS (Throttle Position Sensor) needed to be adjusted. He manually adjusted the sensor while watching the readouts on the S&S software and my car is back to a perfect tune. I guess there are throttle stops that wear over time and can throw things kind of out of wack. You can't visually confirm anything is worn, because the throttle snapped back and close perfectly. Except my RPMs were not decaying to an idle and RPMs sometimes remained high between shifts. Hope this helps. Good info to know.
2019 M3W Sold and is now in Las Vegas enjoying the showgirls :-)
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Joined: Apr 2021
Posts: 99 Likes: 5
Just Getting Started
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Just Getting Started
Joined: Apr 2021
Posts: 99 Likes: 5 |
Hey all,
Results of my rest drive were very pleasing. After cleaning the gunk off the idle air control valve rpm decay is normal again! I actually noticed that I had slowly been adjusting my driving to compensate for the slow rpm decay, I am back to blipping the throttle on gear changes!
M3W 2017 Sport blue.
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Joined: Aug 2013
Posts: 1,562
Talk Morgan Enthusiast
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Talk Morgan Enthusiast
Joined: Aug 2013
Posts: 1,562 |
Could you describe or have a picture of where the idle air control valve is please?
Sorry , it is described clearly above doh
I must read posts properly !
Last edited by nippymog; 25/06/22 09:31 AM.
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Joined: Aug 2013
Posts: 1,562
Talk Morgan Enthusiast
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Talk Morgan Enthusiast
Joined: Aug 2013
Posts: 1,562 |
I also have occasional slow return to idle, and have just got round to checking it. I have checked the throttle linkage etc and all seems ok , so I want to check the Idle Air control described above as being on top of the throttle body. Is it this ? ![[Linked Image]](https://www.tm-img.com/images/2022/07/03/IMG_3778.jpg) If so what do I clean? it all seems clean to me ! ![[Linked Image]](https://www.tm-img.com/images/2022/07/03/IMG_3781.jpg) Thanks
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Joined: Mar 2013
Posts: 1,016 Likes: 2
Has a lot to Say!
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Has a lot to Say!
Joined: Mar 2013
Posts: 1,016 Likes: 2 |
That is indeed the ICV. Not easy to clean, but I use aresol Carb Cleaner to blast stuff out. Be careful not to try to dismantle as the plunger is under spring pressure and if it fires off you mauy never see it again. Also clean the inside of the plenum/inlet manifold to clear gunt too.
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Joined: Feb 2019
Posts: 3,857 Likes: 2
Talk Morgan Addict
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Talk Morgan Addict
Joined: Feb 2019
Posts: 3,857 Likes: 2 |
The cam chest puking oil up into the throttle body sure does not help keep that clean.
2019 M3W Sold and is now in Las Vegas enjoying the showgirls :-)
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