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Roadster V6 3.0 stalling on acceleration from mid-speed
Morgan (Roadster V6 3.0) was starting to show symptoms of 'stalling and then accelerating' when accelerating hard from the middle 2000rpm in 3rd or 4th gear, so I finally started to investigate the cause.
I thought it might be the mass air flow sensor, ignition coils, plugs and high tension cords as they have 70,000 km on them, and normally I would start with the plugs and high tension cords which are the easiest to inspect and replace, but the V6 3.0 is a V6 3.0, and the right hand side is a V6 3.0. But the V6 3.0 has an intake manifold on the right side and an air cleaner box on the left side above the plugs, so I was discouraged.
So, I predicted that it was caused by dirt or a failure of the "mass air flow sensor", which is the easiest to remove, and I first disconnected the connector connected to the sensor, turned off the sensor function and ran with the ECU's registration map installed in the car to see if the "mass air flow meter sensor" was the cause. I have tried to identify the problem, but the symptoms have not improved one iota so far. Also, naturally, the engine warning light remained on. I had forgotten that the roadster has an 'engine warning light'.
Once this engine warning light comes on, it is a nuisance and does not go away even if the "Mass Air Flow Meter Sensor" connector is put back on or the battery is turned off once.
This is where the OBDII diagnostic unit comes in.
I was told that if I registered as a user, I could download the diagnostic data for up to one manufacturer free of charge, but the manual was in English, so I had no idea how to do it, and I had a hard time getting to the download screen. I managed to get to the download screen, but this time, of course, there was no Morgan.
I checked the engine because it was a Ford, and there were AU FORD and EU FORD even if it was the same Ford, so I selected EU FORD without hesitation and downloaded the data. I managed to succeed.
However, this time, the OBDII connector on the car side for the connection of the important diagnostic machine cannot be found, even though I thought I could go with this. I wondered if there was indeed no OBD II for the Morgan. While wondering whether to remove the dashboard or not, I patiently looked for it and found it round the back of the dashboard and the glow box, and succeeded in connecting it.
It took two days from user registration, downloading the software, finding the connector, diagnosing the connection, determining the cause and resolving the symptoms, but the engine warning light was successfully removed.
The problem with the mass air flow meter sensor may be resolved by cleaning it with a special cleaning solution, so I will first buy one of the following products that I found on the internet and give it a try. 1.
1. KURE: Airflow Clean
　　¥700
2. CRC Mass Air Flow Sensor Cleaner
　　¥6,243

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Hello from England,

I had a similar problem with my MAF sensor. The 3.0 Roadster S2 uses the Ford Escape engine, there is a good video at https://www.wheelsjoint.com/ford-escape-bad-maf-sensor-symptoms-causes/ All is fine now since I cleaned mine with MAF spray https://www.ebay.co.uk/itm/185352508139

Re the OBD reader, I had a recurrent issue with the engine warning light, showing a fault in the fuel level sensor circuit. I seem to have cured it by replacing/cleaning the wiring especially around the tank, and I have cleared the OBD code on the reader.

I use the Torque app & a cheap bluetooth OBDII dongle from e bay. Worked fine on my 3.0l Roadster

Hello from the USA. Congratulations on getting the OBDII diagnostic unit connected and functioning especially as everything is in English, are the diagnostics showing any fault codes?

Does this engine have a crank sensor? 🤔

If you have successfully selected and downloaded the appropriate data, you will see the correct selection as shown below. This makes it possible to diagnose the problem with confidence.
The Mondio is only sold by Ford in the UK, so it seems that US FORD does not have the data and the parts supply is also routed differently.
EU FORD was the right choice for the data download.
Vehicle: Mondeo
Capacity: 3.0 L
Engine type: Dustec ST
Vehicle type: Mondeo
Capacity: 3.0 litres
Engine type: Dustec ST

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We do not know how to publish photos, so we regret that we cannot show you images.

If you download the Ford EU data, you will be able to choose between Ford, FordEU and Mazda.
So it seems that a lot of common engines are used and the OBD2 codes have a lot of the same data.
Ford can also be selected, but I started the actual diagnosis by selecting FordEU.

Roadster V6 3.0 stalls on acceleration from mid-speed3

With the increasing possibility that the cause of the stall is not the 'air flow meter' but the 'ignition coil', when the stall symptom occurs, 'I noticed that the tachometer swung up and down significantly, out of sync with the engine speed.
This symptom is the same as when a faulty insulator in the ignition coil causes a leak and the tachometer picks up the noise.
We have now identified the cause of the problem as the 'ignition coil' and not the 'air flow meter' and decided to replace it.　
This time we purchased and replaced it at a nearby Mazda dealership in order to make it in time for the Hokkaido Solomog touring trip starting next month.
The result was a perfect solution.
It took me over a month of research to identify the cause of the problem, so I was convinced that it would cost a reasonable amount of money to have it repaired at the dealership.
Now I can drive around Hokkaido with peace of mind.
Morgan genuine part number: 5F2E-12029-AA (The countermeasure seems to end in B.) Made by Motorcraft.
Mazda genuine part number : 1F21-18-100B Old part number : GY07-18-100 So it seems that a countermeasure product has been released.
Ford genuine part number : DG532
Each manufacturer has its own genuine part number, but all the insides seem to be made by Motorcraft.
Mazda genuine part number: 1F21-18-100B $28,510　

Morgan (Roadster V6 3.0) mass airflow sensor.

It's a hot-wire type, so hopefully the airflow cleaner may fix it.
However, looking at where the sensor was fitted, why is the shape different to the circular part on the sensor side?　This could suck in secondary air if it's not well unattached?
It's a handmade Morgan, so I guess this is a bit of a charm.
I thought that the round shape might have actually chipped off and fallen inside, but looking at the cross section it doesn't seem to be so. Also, if you look inside, you can see dusty dirt. I will clean it together with the cleaner when it arrives.
FORD MASS FLOW SENSOR
1l5f-12b579-ab

I'm posting photos for Horiike.

Engine warning light

OBD2 used.

Air flow meter with connector removed