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On/off acceleration when at low throttle

Mk5 Golf

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#1 Jake_bkd

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Posted 03 July 2020 - 01:34 PM

Dear vag-gods please help me! Recently had timing belt water pump done, since then I’ve noticed quite dramatic lurching on/off throttle when at low revs and only applying minimal pressure to the accelerator, does anyone know if this means they have messed up my timing? Or it’s a different problem with my car. Never noticed this issue before it went to the garage, any help would be much appreciated. Thanks.


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#2 GTMonster

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Posted 03 July 2020 - 01:59 PM

Have you questioned the garage to confirm that the timing is set correctly?

Also does it happen all the time and can it be made to happen on demand? Can you show them?

Incorrect setting of the timing belt would result in strange issues with the engine performance.

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#3 Jake_bkd

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Posted 03 July 2020 - 02:15 PM

I just drove it and it didn’t happen until I tried to make it happen and then it did, I have it booked back in Monday for them to drive and check also but with COVID I cannot go along so if he dosent experience the issue I’m worried they will refuse to investigate. I haven’t been driving much tbh but it mostly happens when in 2nd around 20-30 mph and only when apply like 5-10% throttle anymore and it just powers through. Thinking my dog mount could have snapped when I got exited getting my car back but it would happen all the time..


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#4 GTMonster

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Posted 03 July 2020 - 03:10 PM

Try get a video with sound when it's doing it if possible. It may help.

I usually vid the dash... speed and revs and comment verbally on what gear your in l. Mention anything just after it happens such as sounds, jumpy acceleration, etc.

May allow you to see a pattern and show it.

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#5 Jake_bkd

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Posted 03 July 2020 - 03:14 PM

The Revs don’t really move when it’s happening and there’s not much noise but I will try and video it. I could not manually do what’s happening my car doesn’t respond no where near that fast so I doubt it’s anything to do with the throttle position I’m convinced it’s bad timing. Took the time to go to a “cam-belt specialist” but regretting it already..


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#6 Jake_bkd

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Posted 03 July 2020 - 03:15 PM

Need to get it plugged in to check timing hopefully the garage I used actually has vag-com


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#7 GTMonster

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Posted 03 July 2020 - 04:21 PM

They will either have VCDS or similar to help.

While the revs may not jump in the video, if you say now or something after it happens, each time, there may be a pattern.

Fingers crossed that they will easily diagnose

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#8 Jake_bkd

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Posted 04 July 2020 - 08:47 PM

I just drove it for 30 mins and did not happen once! I’m so confused, if my timing was out would it not happen constantly? Could this be something else? Don’t want to get charged at the garage for 1 either something I can do myself or 2 something that’s not broken


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#9 ttg4l

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Posted 05 July 2020 - 12:14 AM

Sounds like your timing is fine. Take a look at parts that are in close vicinity of the timing belt end of the engine, the garage might've damaged something in the process.

I had a similar thing on my Golf but that was just a bad MAP sensor, it did throw a code for it though so it was easy to find.

#10 Jake_bkd

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Posted 06 July 2020 - 04:29 PM

Update.. had diagnostics ran, didn’t get a code apparently it’s a ghost code so no engine management light. And the code disappeared so he couldn’t print off for me. He said it’s codes for swirl motor possibly partially seizing up would require further investigation, as I don’t want a hefty bill from a main garage I’d rather try and sort myself, any suggestions much appreciated.


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#11 ttg4l

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Posted 06 July 2020 - 04:57 PM

Probably clogged with a load of carbon and gunk. Could try cleaning the intake manifold out, or getting a second hand manifold with the swirl flap motor included, and fit that.

Someone fitted a new engine to their 2.0 TDI a couple months ago and their new engine had the same fault as you, he swapped on his old intake manifold and it was all good.





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