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Re: Misfire on warm up [Re: PhilV] #605372
28/11/19 11:00 AM
28/11/19 11:00 AM
Joined: Feb 2016
Posts: 2,629
East Harling, Norfolk UK
Richard Wood Online NoMood
Talk Morgan Expert
Richard Wood  Online NoMood
Talk Morgan Expert

Joined: Feb 2016
Posts: 2,629
East Harling, Norfolk UK
Originally Posted by PhilV
Hi IMHO. Not sure to be honest. When driving it feels like it is starving itself so I assumed both. Fuel pressure all checks out ok and they have changed the pump. I have not witnessed the issue in the workshop as it was dropped in for a service and I assumed a tweak to the mapping. They found a couple of other issues that we hoped had cured it but this warm up issue remains. I’ll ask them tomorrow as I am due my weekly update.

War Bird - Currently running on standard plugs but again they have been changed. Any recommendations on alternatives?


Iridium plugs may be worth a try. Same heat range used on my car, NGK DCPR7EIX. Due to fine tip they spark at lower voltage.


Richard

2018 Roadster - Red/Magnolia - "Morton"
1966 Land Rover series 2a SWB
1960 Velocette Venom
Re: Misfire on warm up [Re: PhilV] #605412
28/11/19 04:10 PM
28/11/19 04:10 PM
Joined: May 2019
Posts: 75
Hampshire, UK
I
IMHO Offline
Just Getting Started
IMHO  Offline
Just Getting Started
I

Joined: May 2019
Posts: 75
Hampshire, UK
Some easy things to try before delving into more complex issues -

To see if it’s on one cylinder -
Start the engine and hold your hands over the exhaust outlets, they should feel the same or you could feel the colder blast of the miss-fire.
Swap over HT leads and see if the problem moves.

Check the pulley timing position Is correct on each cylinder.

If it’s on both, how old/good is your fuel?


M3W Brooklands (2015)
Norton Commando 750 (1971)
Moody 41 (2013)
Re: Misfire on warm up [Re: PhilV] #605431
28/11/19 05:10 PM
28/11/19 05:10 PM
Joined: Feb 2019
Posts: 2,069
Port Orchard, WA.
LightSpeed Offline
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LightSpeed  Offline
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Joined: Feb 2019
Posts: 2,069
Port Orchard, WA.
Wouldn’t swapping the spark plug lead mean the cylinders are trying to fire on exhaust instead of firing on compression?


Stephen
2019 M3W , 2Kmiles

Re: Misfire on warm up [Re: PhilV] #605433
28/11/19 05:16 PM
28/11/19 05:16 PM
Joined: Aug 2013
Posts: 1,362
Cheshire, UK
nippymog Offline
Has a lot to Say!
nippymog  Offline
Has a lot to Say!

Joined: Aug 2013
Posts: 1,362
Cheshire, UK
The way I read IMHO's post, is to exchange the complete lead left for the right to eliminate the leads themselves?
Not sure how that would help diagnose a misfire when cold though.

Re: Misfire on warm up [Re: PhilV] #605434
28/11/19 05:18 PM
28/11/19 05:18 PM
Joined: May 2019
Posts: 75
Hampshire, UK
I
IMHO Offline
Just Getting Started
IMHO  Offline
Just Getting Started
I

Joined: May 2019
Posts: 75
Hampshire, UK
You can unplug them from the coil pack and the spark plug.


M3W Brooklands (2015)
Norton Commando 750 (1971)
Moody 41 (2013)
Re: Misfire on warm up [Re: PhilV] #605436
28/11/19 05:32 PM
28/11/19 05:32 PM
Joined: May 2019
Posts: 75
Hampshire, UK
I
IMHO Offline
Just Getting Started
IMHO  Offline
Just Getting Started
I

Joined: May 2019
Posts: 75
Hampshire, UK
Nippymog, I just wondered if one of the leads improved when hot. I know it’s a long shot but if the diagnostics isn’t picking it up then it sounds like something at the end of the process and physical?


M3W Brooklands (2015)
Norton Commando 750 (1971)
Moody 41 (2013)
Re: Misfire on warm up [Re: PhilV] #605438
28/11/19 05:45 PM
28/11/19 05:45 PM
Joined: May 2019
Posts: 75
Hampshire, UK
I
IMHO Offline
Just Getting Started
IMHO  Offline
Just Getting Started
I

Joined: May 2019
Posts: 75
Hampshire, UK
Also could be a dodgy spark that’s not so problematic when the engine is hot.

PhilV, when running along with a hot engine do you get any intermittent backfires / popping from any of the exhausts? Could be a dodgy coil pack which is easy to check with a cheap spark indicator.

Good luck!


M3W Brooklands (2015)
Norton Commando 750 (1971)
Moody 41 (2013)
Re: Misfire on warm up [Re: PhilV] #605449
28/11/19 06:31 PM
28/11/19 06:31 PM
Joined: Aug 2013
Posts: 1,362
Cheshire, UK
nippymog Offline
Has a lot to Say!
nippymog  Offline
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Joined: Aug 2013
Posts: 1,362
Cheshire, UK
Someone has already asked is it just one cylinder misfiring - is this the case or is it both?
edit just seen this has been answered as unsure

Last edited by nippymog; 28/11/19 07:01 PM.
Re: Misfire on warm up [Re: PhilV] #605451
28/11/19 06:41 PM
28/11/19 06:41 PM
Joined: Nov 2015
Posts: 2,143
Yorkshire
CooperMan Offline
Talk Morgan Expert
CooperMan  Offline
Talk Morgan Expert

Joined: Nov 2015
Posts: 2,143
Yorkshire
Ask KH to run it on the rolling road whilst COLD with the ProTune connected & watch the live data


Jon M
(was Furloughed - now Redundant)
Re: Misfire on warm up [Re: IMHO] #605460
28/11/19 08:12 PM
28/11/19 08:12 PM
Joined: Feb 2019
Posts: 2,069
Port Orchard, WA.
LightSpeed Offline
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LightSpeed  Offline
Talk Morgan Expert

Joined: Feb 2019
Posts: 2,069
Port Orchard, WA.
Originally Posted by IMHO
Nippymog, I just wondered if one of the leads improved when hot. I know it’s a long shot but if the diagnostics isn’t picking it up then it sounds like something at the end of the process and physical?


I once owned an AH Sprite that would not start or if it it did start when in the cold damp air of our beach community it would run very ragged until it got warmed up.

I found the problem when trying to start it ( someone else using the starter) while observing the wiring in the dark. There was arcing coming from degraded insulation and hairline cracks (invisible to naked eye) in the plastic parts. The UK can get pretty damp so it might be worth a check.

Last edited by LightSpeed; 28/11/19 08:13 PM.

Stephen
2019 M3W , 2Kmiles

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