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Re: 1997 Plus 8 tickover [Re: Phil+8] #675392
29/11/20 09:40 PM
29/11/20 09:40 PM
Joined: Oct 2007
Posts: 243
Sandhurst, Berks
T
teknome Offline
L - Learner Plates On
teknome  Offline
L - Learner Plates On
T

Joined: Oct 2007
Posts: 243
Sandhurst, Berks
A point to check is that the heaters in the lambda sensors have 12 volt power. Feed comes from the fuel pump relay so the voltage is only there when the engine is running. The fuel pump relay should be a single pole normally open relay, there are two output pins, the pump is wired to one pin and the lambda sensor heater to the other pin. If the wrong relay, such as a change over, is fitted the heaters will work when the engine is stopped, and turn off when the engine runs. ECU goes to limp mode and tends to be unhappy at idle. Found this fault on a Plus 8 where the service guys had changed the fuel pump relay.


---------------------------
Mike Smith


1995 +8
2007 +4
Re: 1997 Plus 8 tickover [Re: Phil+8] #675474
30/11/20 03:44 PM
30/11/20 03:44 PM
Joined: Aug 2020
Posts: 36
Cumbria
Phil+8 Offline OP
Just Getting Started
Phil+8  Offline OP
Just Getting Started

Joined: Aug 2020
Posts: 36
Cumbria
A strange thing happened today. I replaced the cap on the top of the radiator as I kept seeing traces of coolant.
When I warmed the car up till the fan cut in, the temp gauge was registering about 15 degrees hotter than before. Maybe 100 whereas it was 85-90 max before.
I took it for a short run and it didn’t stall once. I don’t want to shout hallelujah but could there be a connection?

I know I haven’t fully tested it and it may cut out next time I take it out but I do feel a small victory.

Re: 1997 Plus 8 tickover [Re: Phil+8] #675483
30/11/20 04:05 PM
30/11/20 04:05 PM
Joined: Dec 2017
Posts: 1,114
Evergreen, Colorado, USA
britmog Offline
Has a lot to Say!
britmog  Offline
Has a lot to Say!

Joined: Dec 2017
Posts: 1,114
Evergreen, Colorado, USA
Originally Posted by Phil+8
A strange thing happened today. I replaced the cap on the top of the radiator as I kept seeing traces of coolant.
When I warmed the car up till the fan cut in, the temp gauge was registering about 15 degrees hotter than before. Maybe 100 whereas it was 85-90 max before.
I took it for a short run and it didn’t stall once. I don’t want to shout hallelujah but could there be a connection?

I know I haven’t fully tested it and it may cut out next time I take it out but I do feel a small victory.


I'm struggling to see the connection but stranger things have happened in a Morgan, enjoy the small victory.


Bruce
1964 4/4 Series V Comp (Megan)
1994 +8 (Maurice)
2013 M3W (Olga)
Re: 1997 Plus 8 tickover [Re: Phil+8] #675488
30/11/20 04:41 PM
30/11/20 04:41 PM
Joined: Aug 2020
Posts: 36
Cumbria
Phil+8 Offline OP
Just Getting Started
Phil+8  Offline OP
Just Getting Started

Joined: Aug 2020
Posts: 36
Cumbria
Having walked round the park and had a look at the GoMog link I was given, the only connection I can make is that the coolant sensor is now registering as fully warmed up, whereas before it may not have been.
Traces of coolant was a bit of an understatement. I saw it bubble and squirt coolant out, but the rise in temperature came as a bit of a surprise.

Re: 1997 Plus 8 tickover [Re: Phil+8] #675498
30/11/20 05:34 PM
30/11/20 05:34 PM
Joined: Nov 2015
Posts: 3,540
Yorkshire
CooperMan Offline
Just barreling along
CooperMan  Offline
Just barreling along
Talk Morgan Addict

Joined: Nov 2015
Posts: 3,540
Yorkshire
Phil, by getting a better seal it allows the proper pressure in the cooling system, this allows water to reach a higher temp before boiling and producing micro bubbles (so you get better heat transfer)


Jon M
Re: 1997 Plus 8 tickover [Re: Phil+8] #675510
30/11/20 06:10 PM
30/11/20 06:10 PM
Joined: Aug 2020
Posts: 36
Cumbria
Phil+8 Offline OP
Just Getting Started
Phil+8  Offline OP
Just Getting Started

Joined: Aug 2020
Posts: 36
Cumbria
Yes, that is my thinking that the coolant temp sensor have been previously confused by the low temp, but now it registers the correct working temperature.
It is speculation but if all the ECU sensors agree, then possibly it allows the car to tick over without unnecessary correction.

It does however, still occasionally stall until working temperature is reached, then it appears to settle down.
A decent run will confirm or not.

Last edited by Phil+8; 30/11/20 06:33 PM. Reason: Update
Re: 1997 Plus 8 tickover [Re: Phil+8] #675752
02/12/20 09:08 AM
02/12/20 09:08 AM
Joined: Aug 2020
Posts: 36
Cumbria
Phil+8 Offline OP
Just Getting Started
Phil+8  Offline OP
Just Getting Started

Joined: Aug 2020
Posts: 36
Cumbria
Nojoy.
Back to hunting and stalling.
Can anyone please tell me what and where a Road Speed Sensor is?

Mentioned as a possible cause in GoMog.
Thanks

Re: 1997 Plus 8 tickover [Re: Phil+8] #675755
02/12/20 09:56 AM
02/12/20 09:56 AM
Joined: Sep 2016
Posts: 694
Chester, UK
Grumpy2 Offline
Talk Morgan Regular
Grumpy2  Offline
Talk Morgan Regular

Joined: Sep 2016
Posts: 694
Chester, UK
Mine has a small box on the bulkhead where the two speedo cables join. It also has connections to the ecu. Bit of a fiddle to remove and open (its not supposed to be opened). Inside theres an inductive rotor that obviously sends info about the cars speed to the ecu.

I had some problems with mine (it was squeaking loudly) so I disconnected it and the idle speed increased.

As they are made from unobtanium I decided to carefully open it up and clean it out. It was full of white powdery corrosion and once cleaned and reassembled has worked perfectly and the squeak has gone.


94 plus 8 in Westminster Green - I think!
Re: 1997 Plus 8 tickover [Re: Phil+8] #675756
02/12/20 09:58 AM
02/12/20 09:58 AM
Joined: Sep 2016
Posts: 694
Chester, UK
Grumpy2 Offline
Talk Morgan Regular
Grumpy2  Offline
Talk Morgan Regular

Joined: Sep 2016
Posts: 694
Chester, UK
[Linked Image]

this was the inside of mine


94 plus 8 in Westminster Green - I think!
Re: 1997 Plus 8 tickover [Re: Phil+8] #675763
02/12/20 11:14 AM
02/12/20 11:14 AM
Joined: Aug 2020
Posts: 36
Cumbria
Phil+8 Offline OP
Just Getting Started
Phil+8  Offline OP
Just Getting Started

Joined: Aug 2020
Posts: 36
Cumbria
Many thanks
Unfortunately mine does not appear to have a mechanical speedo cable.

Last edited by Phil+8; 02/12/20 12:37 PM.
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