All Things Mk5 > How to Guides / Troubleshooting
Couple of issues
csrigo:
--- Quote from: Pudding on September 28, 2018, 03:44:57 pm ---For reference, I compression tested mine last summer and saw 14 bar across all 4, it's done 125K miles. 14-15 bar is the spec for a new engine, so I was very surprised by that. Maybe the previous owner blew it up and put a new motor in :grin:
I hate to say it mate, but oil fouling in just one cylinder isn't a good sign. Let's hope you see some encouraging numbers from your compression test. Try it hot and cold and see what the difference is. It's probably wise to pull the fuel pump fuses and crank it for 10 seconds per cylinder with the throttle fully open.
--- End quote ---
Cheers mate thanks for your readings of what to expect as that was another question. Long story short not got round to it yet I left the golf in a friend's garage and I'm away with work. I did give a bit of a crap description thinking about it recently...there is oil on all plugs but more excessive cylinders 1 and 2. I jumped the gun and assumed that was the cause of the miss but it wasn't...suspected leaky injector as above.
I will check the compression as soon as I'm home...still hoping it's the turbo but we will see...i''ll post my findings
pudding:
Sure it's definitely oil on the electrode and not just soot? If a couple of plugs are darker, that can indeed point to an injector imbalance.
csrigo:
--- Quote from: Pudding on October 06, 2018, 03:45:08 pm ---Sure it's definitely oil on the electrode and not just soot? If a couple of plugs are darker, that can indeed point to an injector imbalance.
--- End quote ---
No mate it was unfortunately definitely oil on the threads and electrode...not a lot but enough. But yes two were darker...i think this is two problems.
I'm still overseas so won't know for a while.
csrigo:
Just an update on this now I'm home.
Done my comp test....well happy and relieved! 13bar across them all and almost to the exact psi...all cylinders built pressure pretty similar no major differences there either....thank fu€¥
Also found my air leak with the intake....turbo inlet pipe wasn't sealed well enough(the part that requires cutting un shockingly) dealt with that..air leak /sucking noise(not turbo) has gone and the response is back....again thank fu£k
Still have the slight miss at idle but I'm putting that down to injector imbalance...getting whipped out and posted to R tech this week.
Will update again when I get them back see if it cures it if people have had similar issues.
Meant to add, The oil on the plugs I believe is coming from my cam cover gasket leaking..mainly between cylinders 2 and 3 and is gradually seeping down the thread of the plug...cam cover gasket...cam chain and tensioner...inlet valve clean all getting done in the one go hopefully next week...ordering the VW tools so I can smash it all at once...likely do the belt as well...feckn delighted no comp issues and can get back to maintenance.
pudding:
Good news :happy2:
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