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 Post subject: Rough idle, bad injectors?
PostPosted: Fri May 18, 2018 2:02 pm 
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Newbie

Joined: Thu Feb 16, 2017 12:34 pm
Posts: 7
Hi,

My 2008 2.0 Diesel is having some problems. For a year or so it has had a rough idle, which has got gradually worse. I think the idle speed is ok, but it vibrates a lot to the point where everything in the car rattles so I try to keep my foot slightly on the throttle to stop it. Above 1000rpm it is smoother and quieter, but I can still detect vibrations that don’t feel right. When accelerating it vibrates more noticeably but at a much higher frequency than at idle so it’s less noticeable.

Fuel economy has recently dropped a lot from about 43mpg to 38. It has had other potentially related issues – I replaced a very blocked fuel filter a while ago because it was stalling a few seconds after starting, which resolved the problem. More recently it has stalled a few times and needs to be turned over for a while to restart, but not often.

Currently I’m suspecting the injects may be dirty or faulty, does this seem reasonable? I’d appreciate any other ideas too!

Thanks,
Richard


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 Post subject: Re: Rough idle, bad injectors?
PostPosted: Tue Jun 05, 2018 8:14 pm 
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Soft Roader

Joined: Thu Apr 29, 2010 7:56 pm
Posts: 72
Had similar probs on my '08 - the diesel knock was louder than normal - and the idle was rough. Treated it to a tankful of BP Premium diesel and a bottle of Comma 'Diesel Magic'. Halfway through the tankful and the knock has progressively quietened a lot - seems to get better every outing - and the idle is smooth and almost silent. I'll finish this tankful and take stock then - but all seems promising.


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 Post subject: Re: Rough idle, bad injectors?
PostPosted: Sun Jul 15, 2018 12:29 pm 
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Soft Roader

Joined: Thu Apr 29, 2010 7:56 pm
Posts: 72
An Old Master wrote:
Had similar probs on my '08 - the diesel knock was louder than normal - and the idle was rough. Treated it to a tankful of BP Premium diesel and a bottle of Comma 'Diesel Magic'. Halfway through the tankful and the knock has progressively quietened a lot - seems to get better every outing - and the idle is smooth and almost silent. I'll finish this tankful and take stock then - but all seems promising.

Generally much quieter, but sometimes quite noisy on start-up - give a brief spanking in 2nd gear - up to 4,500rpm - and everything quietens down beautifully.


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