Slight lumpy idle when cold.

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Slight lumpy idle when cold.

Postby BASSCUBE » Wed Aug 02, 2017 3:08 pm

My car drives sweet as a nut most of the time.

Occasionally the car doesn't start first time but will start the 2nd. Then it runs really rough like you can see the needle swaying slightly.

I hear this is a common fault on the 2.0 tdi engines.

Any ideas?

Some people think can be DMF but i doubt it. More likely to be a choked up injector or egr valve?
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Re: Slight lumpy idle when cold.

Postby BASSCUBE » Mon Aug 07, 2017 11:20 am

Hello???
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Re: Slight lumpy idle when cold.

Postby TriGGER » Wed Aug 09, 2017 7:03 pm

Get it into a garage mate.
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Re: Slight lumpy idle when cold.

Postby Roy_01 » Wed Aug 09, 2017 7:53 pm

Sounds like an injector problem.
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Re: Slight lumpy idle when cold.

Postby lewisheywood » Sat Aug 12, 2017 9:15 pm

TDI you're likely looking at either glow plugs (most probable) or injector . Rough idle usually occurs when fuel isn't being burnt properly hence the engine doesn't run as it should and the rpms aren't stable. Is there any smoke on start-up?

Best to run a scan if you can to see if there are any error codes on the plugs, or if you know they haven't been done since leaving the showroom consider changing them anyway as it is rather inexpensive.

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Re: Slight lumpy idle when cold.

Postby BASSCUBE » Thu Aug 24, 2017 8:30 am

It has been scanned and couldn't find any faults. Just recently been serviced also.

Doesn't do it all the time just sometimes and only when it's cold.

Once it is warmed up runs as sweet as a nut.

Surely an injector or glow plug would bring a fault up though?

PS: No smoke.
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Re: Slight lumpy idle when cold.

Postby Roy_01 » Thu Aug 24, 2017 10:20 am

It will not always throw up a fault code, only when it's beyond a certain point/limit.
A bad coolant temperature sensor can also be a cause.
If you are having the cold start problem even in summertime >21 degrees Celsius it would be more likely the injectors or coolant temp. sensor. Because the glow plug pre heating shuts of when the coolant is 21 degrees Celsius.
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Re: Slight lumpy idle when cold.

Postby BASSCUBE » Thu Aug 24, 2017 11:46 am

Hmmm interesting.

Why isn't it hesitant when driving ? Surely if a blocked injector it would be lumpy and erratic all the time?

coolant temp sensor could be it.
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