Just ask for the ECU back and see what happens, and quote back to them that you have found out that they don't know what they are talking about, with your detailed technical knowledge, quoting part numbers and tuning information.

If the second ECU works and you got it cheap, see if they are going to charge you to return the old ECU and how much it would be. Just tell them they haven't done what they were asked to do.

Normal ECU testing is about £40, with VAT £55-£60 tops. Some how I think you may get a much higher price quoted. Then you are left with the decision as to how much you value it, and if you want it back.

Don't take them to court and don't threaten them with anything, I wouldn't even get upset with the idiots, just let us know.

Of course everyone here knows that you can't damage an ECU by running it on an engine with bigger cylinders, you have to fit the wrong injectors (high/low impedance) or the wrong ignition system (coil spec) or wrong sensors. Damaged parts could theoretically damage an ECU, but the fuses and relays are there for good reason.

If they are diagnosing and fixing ECUs, then it doesn't matter how it got damaged, they should be telling you what needs to be fixed and how they are going to fix it. Talking down to customers is never a good policy, especially if they show they haven't got a clue.

On the adaptability of ECUs, if Lynx were to be correct, then how can you have an aftermarket of different ECU developers and manufacturers, which can be adapted to many different vehicles, and if the ECU is wrong, or has the wrong settings, then doesn't the engine get damaged by the wrong tune of the ECU, and not the other way around?

An ECU doesn't care what it is connected to if there is no damage, it just takes the inputs, does it's calculations and makes the outputs......simple really, and if it is an adapting type of ECU, you can be out at the start, but it will adapt and reprogramme itself - mine does on fuel, but uses the knock sensor for protection - you can't damage an engine when the knock sensing circuit is fully functional.

You might damage the cat converter before the engine if the tuning is way out.

vougese39 said:

yet again it is a muppet who raves only trying to make them selves impotant! but really showing it is them who do not understand!

i have it on good authority that the 4.0 adpts to the 4.6 and after 20+ engine conversions never had one back under warranty!

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I don't doubt it mine did 1500 miles before we encountered the problem and I know someone else who is running a 4.6 with stage 1 heads and uprated cam on 4.0 fuel map without any issues.

Beginning to think the old girl is jinxed, the replacement ECU has got lost in the post Seller has apologised and given me a refund but means I need to find another one and I bet it won't be as cheap either!

Mogwyth said:

Beginning to think the old girl is jinxed, the replacement ECU has got lost in the post Seller has apologised and given me a refund but means I need to find another one and I bet it won't be as cheap either!

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Google the ECU Doctor - Plymouth. Great guy and his company will fix any ECU and retain all the settings etc - I have had one done and it's spot on - on a Mazda MX5

angeloc said:

Google the ECU Doctor - Plymouth. Great guy and his company will fix any ECU and retain all the settings etc - I have had one done and it's spot on - on a Mazda MX5

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A) we don't have the ECU, Lynx do.
B) ECU Doctor is who my garage usually use they don't do DII V8 ECUs

Thanks though.