Lump start up,Rev's searching when idling

[Pickleiow]

Hi I have an 04 plate VRS estate when I start it from cold it is lumpy and sounds like it's going to cut out,then once warm runs ok but when sat at the light's or a junction the revs start to search from 8-900 rpm down to 4-500 rpm then back up again just wondering if anyone has any ideas what it could be, cheers

[Martin191]

Try cleaning your throttle body, that fixed a similar problem I had a while back.

[kentphil1]

It may be a dodgy coolant sensor, what dues the gauge read when warm?.

[djsunshyne]

Check around the inlet manifold for any split pipes and hoses sounds similar to issues I had recently

[Pickleiow]

Thanks guy's what can I clean the throttle body with, the temp reads about half way on the gauge and are the pipes around the back of the engine?

[Troubled]

Thanks guy's what can I clean the throttle body with, the temp reads about half way on the gauge and are the pipes around the back of the engine?

I bought some carb cleaner from ebay for about £8.  You'll need a replacement throttle body gasket too - also about £8.  

 

I followed this guide:

http://www.briskoda.net/forums/topic/129943-cleaning-throttle-body-18t-engine/

 

I know NOTHING about cars and managed it.

 

As for the pipes, I was advised to get a boost leak smoke test done.  See my (currently unsolved) thread here:

 

http://www.briskoda.net/forums/topic/401753-53-plate-octavia-intermittent-lumpy-idle-juddering-acceleration-smell-of-fuel/

 

 

Hope this helps.

[Pickleiow]

I've noticed one of the pipes to the right of the dip stick has a split in it where a job a jubilee clip has been rubbing it, it has nearly split in two so going to replace that tomorrow see what happens

[Martin191]

http://forums.vwvortex.com/showthread.php?4893472-DIY-Ultimate-SAI-N249-PCV-EVAP-Delete

 

I recommend doing n112, n249 and pcv delete with a catch can install. This will remove all potential air leaks and overall creates a much more responsive car (you'd be surprised!)

 

Also in regards to the throttle body, you won't need a replacement gasket if you're careful, and Euro car parts sells carb cleaner for £2.50, if you've got one close. I think they also do the tb gasket too, don't quote me on that though.

 

Edit -

http://forums.vwvortex.com/showthread.php?5417830-FAQ-Links-DIY-Reference-Table-of-Contents-1-8t

This has just about every problem noted, a search on there usually brings up a guide on how to solve it. 

Edited 20 June, 2016 by Martin191

[Pickleiow]

There was A 't' shaped pipe below the inlet manifold which had split, changed that and she's running beautiful, thanks for the help guy's

[Troubled]

Glad you got it sorted.  Well done!

Any chance you could mark the thread as solved so people can see at a glance that you had success?