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Gts 250ie
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I have changed ecu , fuel pump , injector, spark plug and cap , ht lead , the brown key has been matched to ecu .
Turns over but will not start even though the immobiliser light flashes correctly. Battery is ok
Any ideas please at a loss of what it is
Thanks
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Was it a new or secondhand ECU?

Not sure how it works on a Vespa but I'm currently having an ECU replaced on my car. A new ECU has to be programmed in, or if I buy a secondhand ECU, I also have to have the clocks and a few other items that are all coded in the same loop - or it won't work.

Does the mileage display correctly?
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Hi Yes it does and all appears correct
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And it's a second hand ecu
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Chelle1509 wrote:
And it's a second hand ecu
My guess is that the ECU is coded to the old Vespa and doesn't match.

For my car, I've had to buy a secondhand ignition barrel, an airbag controller, new speedo / clocks and the ECU as a set from the same vehicle. Fitting a secondhand ECU on its own, wouldn't allow the car to start.
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If it turns over when you press the start button as you say then it's not a problem with the immobiliser/key.

Why did you replace all these parts?

PS i happily used a 2nd hand ecu for a long time in my Vespa
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If a secondhand ECU does work standalone, then are you sure this ECU isn't also broken?

And are you sure the ECU is from the same model?
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What was the problem that led you to replace all these parts?
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It cut out as if it had run out of fuel, them would not start again
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Also when new fuel pump fitted it started up ran on idle soon as open throttle it cut out
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Ht coil?

And do you hear the fuel pump?

Maybe a relay?
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Yes fuel pump working and ecu is, tried it out on another scooter
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