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Bargain Basement Bucket List Big Cat - LAWNMOWER UPGRADE FITTED! (19/02/24)


320touring

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On Thursday this week, I took this along to an LPG specialist. He was picked because I saw he did a lot of El-Grand work, and those tubs are a difficult thing to do well.

En route, I stopped for a high powered exec luncheon

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The chap was extremely pleasant, all the tools on a tool board, unit tidy and a MK2 Mondeo 2.0 petrol in the corner as a tinkering project. So far so good!

 

I brought the car in, and he set up to read it.IMG_20240201_132304840.thumb.jpg.fd9f09d9961b824f6f1e57eb470efc6a.jpg

The car has a top spec AC Stag sequential injection system. As such, he was able to attach a Bluetooth Dongle to the LPG ecu. All a fair bit fancier than the old single point systems I have had before.

The LPG ecu is piggy backed onto the main ECU and uses it's signals for airflow, pedal demand/throttle body positioning and spark timing.

Looking at the logs for when the system was last checked/serviced, it was last Accessed on the day after it was fitted in July 2019.

The car has done about 70+k miles since then..

The first thing we noticed was that the short term and long term fuel trims were all over the shop.IMG_20240201_1333130783.thumb.jpg.75b937ab8cbd726584d69e9d5ce8cf5b.jpg

His suspicion was that the AFM was not generating a valid signal.

He suggested that at idle, something at 4L should be registering between 4-5grams of air per second.

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As we can see, It's only registering 1/10th of that. 

At this point, he said he was not prepared to try tuning the LPG until the car was running correctly on Petrol. I said I totally understood his position, and that it seemed a most sensible course of action.

 

He asked what symptoms I was experiencing - I explained the issues with it stuttering/ delayed response.

He decided to try and run a diagnostic program to check the LPG injectors. The ECU has the ability to add additional flow to each injector to balance the fuelling ( to account for wear/contamination from the oil/lubricant fraction used in the LPG)

The ECU can add up to a maximum of 25% additional flow. So the lower the number in the table the better.

The results?

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So injectors 2/4/5 are gubbed, with 3/6 showing some wear. This was not entirely unexpected given the lack of servicing or maintenance since it was fitted.

Injectors are not too expensive and his costs for fitting/mapping the LPG seems very reasonable. 

He took a look at the fuelling curves and found another issue.

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The blue line is the petrol curve, and the green is LPG. The way this was mapped when installed has made the LPG much richer - add in the failed AFM and then it's easy to see why the LPG setup was not smooth.

He pulled the LPG fuelling back a touch, and the car is significantly more driveable.

Now to find a replacement AFM...

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  • 320touring changed the title to Bargain Basement Bucket List Big Cat - Floody Hell!! (12/02/24)
  • 320touring changed the title to Bargain Basement Bucket List Big Cat - LAWNMOWER UPGRADE FITTED! (19/02/24)

As per @Broadsword's recommendation I have changed the spark plugs on this today.

These are the recommended plugs. They are also a common lawnmower sparkplug, so ideal for a big tractor like this🤣

They were £13.30 for 6 delivered. I checked each of the coil packs and they seemed ok, but I may consider fitting new ones If they can be found at reasonable cost.

Overall, I'm not seeing too much to worry about.

 

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As @jaypee knows, I absolutely adore* changing plugs in multi valve heads...

Anyway, first step was pull off the coil pack cover

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You can see the replacement coil fitted to #2 that seemed to help running.

All the plugs came out ok, but we're certainly not in the first flus of health, here's #6 Vs a new one

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And counting down...

6

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5

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4

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3

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2

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1

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