Astra power loss

Rdk

Hi, can anyone help! I've got a '03 1.6 astra and it keeps losing all power. Been happening for several weeks and last week it happened @ 80mph on m25! When I take my foot off the accelerator the engine management light comes on and I lose all power. Takes couple of mins to restart. I took to a garage who said it was a build up of carbon, he cleaned it up and it worked better for a week. Took it to vauxhall who hooked it up but it had registered no faults. They topped up oil! I've had carbon clean-out and tried fuel line cleaner. Any ideas????
Thanks

forgotmyname

Dirty or intermittent sensor.

Flywheel sensor or Cam sensor etc.

You want a specialist not just someone that plugs it in and says no codes.

Check the live data for these sensors and see if the figures spike.

Enfieldian

Loss of compression?

forgotmyname

Unlikely to lose compression that an engine restart fixes.

Lost compression would be serious like a dropped valve or piston/ring damage.

Not something that fixes itself.

Lazy mechanics, Code says... So it must be that and not investigate what else could give that code.

Fuel pressure low - You need a new pump. £1000 please.

Or check to see if they are any leaks, Check the filter, Leakoff pipes and injectors. Or the sensor itself.

colino

Why didn't you go back to the original garage who pointed you in the right direction? Cleaning the egr sometimes works (in your case, temporarily) and a pound to a penny yours needs replaced.

mkirkby

colino wrote: »

Why didn't you go back to the original garage who pointed you in the right direction? Cleaning the egr sometimes works (in your case, temporarily) and a pound to a penny yours needs replaced.

Or MAF sensor. Butterfly valve on the MAF sensor can stick as well. A sudden lift off power will close this valve and might cause it to stick.

This is not a diagnosis, just a possibility. Does the power loss always happen after you lift off the accelerator?

How did the first garage 'clean' the engine? If that improved it, then I think that's the route to investigate. If he sprayed something into it that might have cleaned up one of the sensors mentioned or loosened the butterfly valve for a short period of time.

A couple of pointers:-

http://www.justanswer.com/uk-car/6duqp-vauxhall-astra-03-1-6-vauxhall-astra-runs-perfectly.html
http://www.youtube.com/watch?v=SKnXWZOk5lQ

just possibilities of course....

colino

Your confusing the butterfly in a throttle body with a MAF.

mkirkby

colino wrote: »

Your confusing the butterfly in a throttle body with a MAF.

I know. & I'm not that senior either...