MK5 TDI rough start issue

[kaiisons]

Hi Guys,


Just wondering if you guys could help with a MK5 golf which I have recently picked up.


So far I have changed the oil and filter, air filter, fuel filter and housing.


As the title suggests I am having trouble with my golf and its tendency to be difficult to start. As it goes in the morning it will start up first go sort of, for a second or so it is really rough and shakes the car around a bit, much like it is not getting enough fuel. Once started it idles relatively smoothly. The main issue I am having is that when hot it does not like to start as well, really rough and usually doesn't catch on the first try. I have read that it may be the starter motor or battery or some ECU software where it is not injecting enough fuel when it is hot. Below is a clip I hope you guys can give me some ideas. Cheers

[h100vw]

Hi Guys,


Just wondering if you guys could help with a MK5 golf which I have recently picked up.


So far I have changed the oil and filter, air filter, fuel filter and housing.


As the title suggests I am having trouble with my golf and its tendency to be difficult to start. As it goes in the morning it will start up first go sort of, for a second or so it is really rough and shakes the car around a bit, much like it is not getting enough fuel. Once started it idles relatively smoothly. The main issue I am having is that when hot it does not like to start as well, really rough and usually doesn't catch on the first try. I have read that it may be the starter motor or battery or some ECU software where it is not injecting enough fuel when it is hot. Below is a clip I hope you guys can give me some ideas. Cheers

I'd suggest that you have it scanned with VCDS. It's by far the best place to start looking. When you drive it, is there excessive smoke from the exhaust at all.

Which engine is it 103KW?

Gavin

[kaiisons]

No smoke at all thebonly other thing is that the engine sort of wobbles at around 1800rpm

[h100vw]

No smoke at all thebonly other thing is that the engine sort of wobbles at around 1800rpm

Has it been bad starting since you got it or only since the servicing?

Gavin

[kaiisons]

I've only owned it for two weeks, didn't do it in the test drive but has basically ever since

[kaiisons]

and yes it is the BKD engine pretty sure.

[Umai Naa!!]

Check battery voltage before you start it m, and also measure cranking rpm. Needs to be over 280rpm.

[kaiisons]

Check battery voltage before you start it m, and also measure cranking rpm. Needs to be over 280rpm.

Thanks for the tips Umai Naa!! I am new to these water-cooled beings. I am more familiar with their older air-cooled siblings.

How would I check cranking RPM? Do I need some scanning cable?

Thanks again.

[The One]

DSG? Always a good idea to remove starter motor and inspect DSG flywheel. They usually get loose after awhile causing excessive movement on startup causing hard start problems, shaking/hesitation/jerking etc.

Also note that you will probably have a G70 crankshaft sensor fault, which will most likely be due to trying to start it over and over (dont overlook it) but just make sure it's not logged because you've been trying to crank it so long, as opposed to it actually being faulty.

[Transporter]

Hi Guys,


Just wondering if you guys could help with a MK5 golf which I have recently picked up.


So far I have changed the oil and filter, air filter, fuel filter and housing.


As the title suggests I am having trouble with my golf and its tendency to be difficult to start. As it goes in the morning it will start up first go sort of, for a second or so it is really rough and shakes the car around a bit, much like it is not getting enough fuel. Once started it idles relatively smoothly. The main issue I am having is that when hot it does not like to start as well, really rough and usually doesn't catch on the first try. I have read that it may be the starter motor or battery or some ECU software where it is not injecting enough fuel when it is hot. Below is a clip I hope you guys can give me some ideas. Cheers

What's your location?

[kaiisons]

What's your location?

Sorry I am in Sydneys West. Near Penrith.

[kaiisons]

DSG? Always a good idea to remove starter motor and inspect DSG flywheel. They usually get loose after awhile causing excessive movement on startup causing hard start problems, shaking/hesitation/jerking etc.

Also note that you will probably have a G70 crankshaft sensor fault, which will most likely be due to trying to start it over and over (dont overlook it) but just make sure it's not logged because you've been trying to crank it so long, as opposed to it actually being faulty.

i hope it is not the flywheel i don't have a scanner to check for codes. any other symptoms i should look for to confirm the flywheel is to blame?

[The One]

i hope it is not the flywheel i don't have a scanner to check for codes. any other symptoms i should look for to confirm the flywheel is to blame?

Not really, if you absolutely cannot fault the issue (i.e: using logistic diagnosis and ruled out every possibility) then it's time to pull the gearbox and check the flywheel by hand for excessive movement..

[kaiisons]

Not really, if you absolutely cannot fault the issue (i.e: using logistic diagnosis and ruled out every possibility) then it's time to pull the gearbox and check the flywheel by hand for excessive movement..

that is beyond my capabilities. anyone that you can recommend in western sydney area?

[The One]

that is beyond my capabilities. anyone that you can recommend in western sydney area?

Not to sure of anyone in Sydney, sorry. But don't be scared just yet, get a logical diagnosis going, it could be something simple. I am just advising on the DSG flywheel possibility because I have seen them cause this issue many times before, this does not mean this is your issue, just a possibility. Remove the gearbox to check the flywheel as a last resort .