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2005 roadster no cold weather start #730896
22/01/22 09:15 PM
22/01/22 09:15 PM
Joined: Aug 2021
Posts: 12
the villages florida
M
moggin Offline OP
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moggin  Offline OP
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the villages florida
My – new to me – 2005 Roadster V6 (3.0) won't start in cold weather. Just cranks and cranks. However, it starts quickly in higher ambient temperatures. And runs great once started. Anyone experienced this problem? Any suggestions/advice that I might pass on to the shop that's trying to figure it out? Thanks.


You can't beat a man at his own game.
Re: 2005 roadster no cold weather start [Re: moggin] #730897
22/01/22 09:37 PM
22/01/22 09:37 PM
Joined: Oct 2020
Posts: 26
Guildford Surrey
B
Brian G Offline
Just Getting Started
Brian G  Offline
Just Getting Started
B

Joined: Oct 2020
Posts: 26
Guildford Surrey
First thing that comes to mind is the coolant temperature sensor, probably already checked by your mechanic though.
B


Morgan Roadster S2
Jaguar F Pace S
WW2 Jeep
Re: 2005 roadster no cold weather start [Re: moggin] #730904
23/01/22 12:09 AM
23/01/22 12:09 AM
Joined: Aug 2021
Posts: 12
the villages florida
M
moggin Offline OP
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moggin  Offline OP
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Joined: Aug 2021
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the villages florida
Yes, they checked that. The scan tool read coolant temperature as 95 degrees F while cranking but 40 degrees F with ignition key returned to "on" position. Plugged in a new coolant temperature sensor, no changes. Also, same readings with the coolant temperature sensor disconnected.


You can't beat a man at his own game.
Re: 2005 roadster no cold weather start [Re: moggin] #730915
23/01/22 10:21 AM
23/01/22 10:21 AM
Joined: Jul 2007
Posts: 22,111
Suffolk
John V6 Offline
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John V6  Offline
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Suffolk
My S1 had problems with air leaks and could show lean mixture fault codes. Check all the inlet manifold hoses for leaks after the MAF sensor.
Is the idle air control valve working OK? I have spare if you need one.

Check the earths & check the plug gaps.


JohnV6
2014 Brooklands Edition Roadster "Brookland's Belle" #5 of 50
Re: 2005 roadster no cold weather start [Re: moggin] #730920
23/01/22 11:54 AM
23/01/22 11:54 AM
Joined: Apr 2017
Posts: 1,695
Staffordshire
IvorMog Offline
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IvorMog  Offline
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Staffordshire
Originally Posted by moggin
Yes, they checked that. The scan tool read coolant temperature as 95 degrees F while cranking but 40 degrees F with ignition key returned to "on" position. Plugged in a new coolant temperature sensor, no changes. Also, same readings with the coolant temperature sensor disconnected.


With what ambient temperature?

Why would the temperature change between cranking and ignition on? Surely the temperature should only change after the engine is running and heating up. Assuming the engine has been standing for some time so no residual hot spots in the engine.


Bob

2009 Black Roadster
1999 4/4 2 litre Zetec
Re: 2005 roadster no cold weather start [Re: moggin] #730922
23/01/22 12:19 PM
23/01/22 12:19 PM
Joined: Oct 2020
Posts: 26
Guildford Surrey
B
Brian G Offline
Just Getting Started
Brian G  Offline
Just Getting Started
B

Joined: Oct 2020
Posts: 26
Guildford Surrey
Beat me to it 😁


Morgan Roadster S2
Jaguar F Pace S
WW2 Jeep
Re: 2005 roadster no cold weather start [Re: moggin] #730939
23/01/22 03:15 PM
23/01/22 03:15 PM
Joined: Apr 2017
Posts: 1,695
Staffordshire
IvorMog Offline
Talk Morgan Enthusiast
IvorMog  Offline
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Staffordshire
Originally Posted by moggin
Yes, they checked that. The scan tool read coolant temperature as 95 degrees F while cranking but 40 degrees F with ignition key returned to "on" position. Plugged in a new coolant temperature sensor, no changes. Also, same readings with the coolant temperature sensor disconnected.


Just thinking about this again.

Are you sure you're reading the correct temp sensor? If the coolant temperature sensor was disconnected why would you still get the same readings as when it is connected?

There is also an intake air temperature sensor which helps to control the cold start enrichment process so that needs checking as well.

I wonder if the 2 sensors are being confused in the diagnostics...


Bob

2009 Black Roadster
1999 4/4 2 litre Zetec
Re: 2005 roadster no cold weather start [Re: moggin] #730944
23/01/22 04:09 PM
23/01/22 04:09 PM
Joined: Aug 2021
Posts: 12
the villages florida
M
moggin Offline OP
New to Talk Morgan
moggin  Offline OP
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Joined: Aug 2021
Posts: 12
the villages florida
Thanks for all your responses. The car is still in Pennsylvania awaiting transport to the Daytona Morgan dealer. It's scheduled to be picked up tomorrow (Monday) and, 2 days later, delivered to the Morgan dealer in Daytona, FL who will pick up where northern shop left off. The PA shop couldn't locate a wiring diagram and so "couldn't continue without it." I'm concerned that, with the warmer temperatures in Florida, my dealer won't be able to recreate the cold weather starting issue in order to diagnose it.


You can't beat a man at his own game.
Re: 2005 roadster no cold weather start [Re: moggin] #730949
23/01/22 05:17 PM
23/01/22 05:17 PM
Joined: Jul 2007
Posts: 22,111
Suffolk
John V6 Offline
Brooklands Register contact
John V6  Offline
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Well wiring diagrams as they exist aren't that good. I would hope they know but info can be found here

GoMog roadster specific


JohnV6
2014 Brooklands Edition Roadster "Brookland's Belle" #5 of 50
Re: 2005 roadster no cold weather start [Re: moggin] #730951
23/01/22 05:22 PM
23/01/22 05:22 PM
Joined: May 2010
Posts: 8,353
Llanelli
sospan Offline
Talk Morgan Guru
sospan  Offline
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Joined: May 2010
Posts: 8,353
Llanelli
As above, check the air intake sensor. Your mechanic could try using ice or similar in the incoming air to cool it to simulate cold conditions.
Thinking about it, my old Ford Escort had an automatic choke, basically a bimetallic coil that was warmed up and disconnected the cold start richer fuel setting. They had a habit of sticking on so could cause flooding during warmer starting. The head coolant temperature was the trigger to cut it off from cold start setting if I remember correctly.
Not much use for you with an efi system with an ecu selecting cold/warm start maps though!
Try Ford owner websites to ask the question. It’s likely that a similar fault has been experienced by members.



Last edited by sospan; 23/01/22 05:32 PM.

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