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[JamesV6CDX]

I have, completely on impulse, bought a cheap, but seemingly very tidy Astra Estate, for not very much money.

It's a 2011 Astra "J", with the 1.7 CDTi engine, around 100,000 on the clock. Excellent MOT history.

Known fault - running poorly.

The owner, who has had the car from 2015 and is the second owner, said "It wasn't running good, the AA man came out, said it was on three cylinders, and could be an injector or DPF fault".

Anyone have any experience?

I will, naturally, start with a code read and methodically troubleshoot it, but I know nothing about these "modern fangled" diesels *

* in comparison to my old Omega!

That said, I managed a top end rebuild on a 6 Cylinder BMW530d previously, so I would like to think this won't beat me!

[Andy B]

..., the AA man came out, said it was on three cylinders, and could be an injector or DPF fault".

 ....

He'd not got a clue then .... 

[Sir Tigger KC]

Uncle STEMO has encyclopedic knowledge of the Vauxhall Astra. 

However if he's doing his daily shop at ASDA or walking the whippet, that hairy arsed builder fella seems to know a bit as well!   

[dave the builder]

Start with a code read as you say James 
common issues include the alternator clutch ,blowing exhaust flexi,leak off pipes,vac leaks etc
 fuel filter never being replaced 
had 1 with no codes playing up and it finally threw a code for crank sensor ,replaced and been fine since
don't have any on the fleet with DPFs sorry

[STEMO]

Can't see how running on three could be a dpf fault, injector looks favourite.

[Migv6 le Frog Fan]

Probably need an injector with the same numbers on and then coded in to the car.

[biggriffin]

Cam cover,.

[JamesV6CDX]

What is the score with coding the injectors on these? What’s needed, T2? Will it be injector work at all prior to coding?

[Jimbob]

The tool that shall not be named worked fine for coding injectors on the Zafira

[JamesV6CDX]

Cheers JimBob

So letting the car idle - if you pull off the injector electrical connectors one by one, they all cause the engine to run worse - apart from no4

No4 injector makes no difference.

Using a multimeter on each plug, each one has consistent electrical pulses

Fair to say no4 goosed?

[STEMO]

Cheers JimBob

So letting the car idle - if you pull off the injector electrical connectors one by one, they all cause the engine to run worse - apart from no4

No4 injector makes no difference.

Using a multimeter on each plug, each one has consistent electrical pulses

Fair to say no4 goosed?

Sounds about right, just like pulling spark plugs. IIRC, and depending on which 1.7 you've got, they can be expensive. I should imagine there'd be quite a few scrappers knocking about, but you won't be able to get to them for a while.

[Field Marshal Dr. Opti]

Cheers JimBob

So letting the car idle - if you pull off the injector electrical connectors one by one, they all cause the engine to run worse - apart from no4

No4 injector makes no difference.

Using a multimeter on each plug, each one has consistent electrical pulses

Fair to say no4 goosed?

Sounds about right, https://www.omegaowners.com/forum/index.php?action=post;quote=1937783;topic=146571.0;last_msg=1937783#just like pulling spark plugs. IIRC, and depending on which 1.7 you've got, they can be expensive. I should imagine there'd be quite a few scrappers knocking about, but you won't be able to get to them for a while.

The scrappers charge silly money for parts these days.

[STEMO]

Cheers JimBob

So letting the car idle - if you pull off the injector electrical connectors one by one, they all cause the engine to run worse - apart from no4

No4 injector makes no difference.

Using a multimeter on each plug, each one has consistent electrical pulses

Fair to say no4 goosed?

Sounds about right, https://www.omegaowners.com/forum/index.php?action=post;quote=1937783;topic=146571.0;last_msg=1937783#just like pulling spark plugs. IIRC, and depending on which 1.7 you've got, they can be expensive. I should imagine there'd be quite a few scrappers knocking about, but you won't be able to get to them for a while.

The scrappers charge silly money for parts these days.

Been looking for second hand parts for your jag? 

[Doctor Gollum]

There are some bargains to be had on used bits... just need to shop around

[Field Marshal Dr. Opti]

I used to like the scrappers when you could fill your pockets with all manner of car parts and some deranged old scrapper with a mentally unstable dog would say 'Gis a quid mate'

Those days seem long gone.