Vauxhall Astra Turbo Throttle by Wire problem

[rjben]

Hope somebody can help. A friend has an Astra turbo that is suffering from iratic acceleration (Not me 'onest!!). The symptoms are - when accelerating at full throttle, the car seems to accelerate hard, then back off, then go again and continue like this until rev limiter.

He has taken it to a dealer who confirms that even though the throttle is at 100%, the ecu is actually cycling between 70 - 100% throttle through the acceleration process.

The very helpful dealership told him that as there was no fault code then there is nothing wrong (thanks) and it is probably something to do with emissions blah blah blah…they all do that boll*x.

Does anybody have any ideas? Your help would stop a sales rep going insane on the motorway!

Cheers,

Rob

[flooritforever]

A former car of mine developed a problem like this after I sorted out a whole host of other problems, which included running far too rich. This caused the cat to block up, producing symptoms like yours.

Could be your cat has taken a knock and broke with similar results.

>> Edited by flooritforever on Tuesday 16th March 11:15

[deltaf]

OOOOOOOOOH. Check theres not a hole in one of the boost hoses. Once had this happen on an "astra turbo" that had been retrofitted with a calibra engine..(before vauxhall did it).
Turned out to be a split hose or a loose clamp that vented boost and then didnt....
HTH

[nighthawk]

Does sound like it's boost related and the standard electronic control valve is known to cause problems because it can't hold the pressure.

A few members on
Astra sport

have had similar situations with their electronic dump valves, have a browse of their tech sections. easily sorted out with an aftermarket item

[rjben]

Thank you very much for the suggestions gents, your help is much appreciated.

I’ll pass on your opinions and get him to check it out.

Ta,

Rob