All Things Mk5 > How to Guides / Troubleshooting

Poor idle

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LC5F:
The quick check for PCV leak is:
With engine idling, undo the oil cap, with a good sealed engine there should be vacuum resistance to pulling the cap off and once its off the engine will stumble.
If you have a leak there should be little change in the idle.

JASGTI:
Good evening

So iv just tried removing the oil cap and have plenty of vacuum and the idle gets worse.

Thinking I get a new pcv and both pipes, new rocker gasket and new dip stick. Anything else that could be leaking air?

If I fit a runner flap delete do I need to get it mapped straight away ?

Plan is to go to r tech eventually once iv got exhaust, intake, intercooler and internals for a stage 2+ but that will be more like this time next year.

pudding:
Doesn't need mapping straight away but you will very likely get a lot of misfiring during warm up, more so over the colder months, which will be annoying.

JASGTI:

--- Quote from: Pudding on September 10, 2021, 12:01:15 pm ---Doesn't need mapping straight away but you will very likely get a lot of misfiring during warm up, more so over the colder months, which will be annoying.

--- End quote ---

Might leave that until next year then and concentrate on the idle issues first.

JASGTI:
Good evening

So after changing the rocker cover, pcv and pipes it still ideas poor and hunting. So took the air box and MAF off reved it up a little and took it for a spin and its 99% better maybe just a little hint of it but nothing major. Should I be getting new MAF or is this pointing to something else?

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