Engine stalls

[AndyR]

Hi folks. My Astra has developed an engine stall. Starts up fine and runs reasonably well under power. But as soon as you back off power to come to a stop, the engine cuts out. 

I didn't think an automatic would do such a thing, but yep she is. I have changed plugs and coil pack. No difference. It does sound like there is a bit of a misfire on tick over. 

Any help or ideas would be greatly appreciated.  

TIA. Andy.

[AndyR]

Well after doing some research, I have discovered that it is a problem with the throttle body.  So later today its getting hauled off and cleaned out. If that doesn't cure the problem then I'll have to invest in a replacement. 

I will keep everyone posted on the results. 

[Vauxhall Owners Club]

that's probably the first place I would start Andy but also pay careful attention to any rubber hoses, vacuum lines and anything likely to draw draw unregulated air and cause a vacuum leak which may also cause similar symptoms

Let us know how you get on with it

[AndyR]

Well I removed the throttle body and gave it a good dowsing of carb cleaner. It was very Carboned up below the butterfly.  I'm going to give the EGR a clean out too. And hopefully it will be a good cure. 

[AndyR]

Well the clean up of throttle body improved the performance and the idling is a bit better. I have invested in a new fuel filter as apparently it can give the same symptoms that i am suffering with at the moment. So at some point tomorrow afternoon, i will swap them over and see how it goes. 

WATCH THIS SPACE FOR NEWS ON THE OUTCOME. 

[Vauxhall Owners Club]

Thanks Andy for sharing the detailed report as it would be useful for anyone else who is experiencing the same issues.
I don't think it does any harm to internally clean some components due to carbon build up and degrading seals and gaskets.
I think we are yet to see how the increased Ethanol in fuel will affect the older vehicles particularly when it comes to seals and gaskets - only time will tell.

Look forward to the updated reports

[AndyR]

Here's the update on the astras running issues. 

Changed out the fuel filter this evening, and after a rough start and idle, she seemed to pick up. Took her out for a test run, and first junction after a mile, she cut out. Restarted straight away. Went on a run for about ten miles, and withhaving to stop every so often as it's narrow country lanes around here. She had no issues of stalling. Gave her a good hard run on the clear straights, and yes she's back toher good old self. Pulling like a trojan, and stopping without cutting out. 

So if anyone has these issues. Then I suggest replacing fuel filter. 

Tomorrow we're off to the coast. So some fresh fuel and a good run should sort her out.