MK5 Golf GTI

All Things Mk5 => Mk5 General Area => Topic started by: Mego on February 02, 2016, 04:15:54 pm

Title: Need Ur Help..Video Of my car while smoking on deceleration..
Post by: Mego on February 02, 2016, 04:15:54 pm

Hi There,,
been trying to figure out my car problem before start to work on my engine..turbo is fine after being checked by 2 turbo guys..did a full pcv delete and didnt help..hope u can help me before i start to change valve stem seals as its the most possible cause as i have been told..

compression test is done and done all all ok..dry starting cyl1 153,150,150,148 wet 160,160,165,157

here is the video

Thank you.

Title: Re: Need Ur Help..Video Of my car while smoking on deceleration..
Post by: pudding on February 02, 2016, 04:47:52 pm

Compressions are a little low, but not horrendous.  Around 180-190psi on a new engine.

That does look like classic valve guide wear.  Loads of over-run, followed by smoke when back on the gas.  That isn't a lot of smoke though.  I bet a lot of GTIs do that on such long hills and people don't realise.

Title: Re: Need Ur Help..Video Of my car while smoking on deceleration..
Post by: Mego on February 02, 2016, 06:00:10 pm

Thx for ur answer..my smoke issue started after fitting a catless dp and going stage 2 remap..seems oem dp was hiding smoke..why u said guides not seals?

Title: Re: Need Ur Help..Video Of my car while smoking on deceleration..
Post by: ROH ECHT on February 03, 2016, 02:50:14 am

There are both seals and guides on the valve stems.

Valve stem guides:

(https://www.mk5golfgti.co.uk/forum/proxy.php?request=http%3A%2F%2Fi1205.photobucket.com%2Falbums%2Fbb434%2Frohecht%2Fdumb%2520forum%2520stuff%2Fco3a0017fsi.jpg&hash=3b3a74cc0f28893ee651b62c9f93a025370477b0) (http://s1205.photobucket.com/user/rohecht/media/dumb%20forum%20stuff/co3a0017fsi.jpg.html)

There are seals for both intake and exhaust valves. The exhaust valves get hotter and their seals differ from the intake seals to withstand the extra heat:

(https://www.mk5golfgti.co.uk/forum/proxy.php?request=http%3A%2F%2Fi1205.photobucket.com%2Falbums%2Fbb434%2Frohecht%2Fdumb%2520forum%2520stuff%2Fintegrated_engineering_exhaust_valve_seals_vw_audi_18t_20v_1_1.jpg&hash=18df9cbd644e4f3e6302cf41b27f1d06e1ded745) (http://s1205.photobucket.com/user/rohecht/media/dumb%20forum%20stuff/integrated_engineering_exhaust_valve_seals_vw_audi_18t_20v_1_1.jpg.html)

Title: Re: Need Ur Help..Video Of my car while smoking on deceleration..
Post by: GTI-MATT on June 23, 2016, 08:19:11 am

Any update/fix with this problem mate?

Title: Re: Need Ur Help..Video Of my car while smoking on deceleration..
Post by: jez_monkey on June 29, 2016, 02:46:50 pm

Quote from: GTI-MATT on June 23, 2016, 08:19:11 am

Any update/fix with this problem mate?

What he said - my jetta has started doing this just after fitting a de-cat exhaust system