All Things Mk5 > How to Guides / Troubleshooting

Boost drop and missfire

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Pjhowy:
I did think an injector would be the issue due to it pulling back the boost due to the afr leaning out, I took it down the my local mechanic who I know well and he said he will book it in for diagnosis, on the way to the garage it never misfired but still left me with a boost drop at 4/5k.

This could be due to the valves not seating properly also so he will run compression test and if needed clean my valves but to be honest I want that done anyway with the swirl flaps also carbon cleaned with new injectors for peace of mind.

pudding:
How many miles on the engine?  The valve seats don't usually carbon up enough prevent them from sealing properly. It's just the tops of the valves and the stems that get bunged up.  It's worth asking your chap to do a compression test though, for peace of mind, if you suspect that is a problem.

It could be injectors.  When they start to go, they cause all sorts of running problems.  Sluggish off boost, surging/bucking at low rpms/light throttle, idle misfires and laggy boost.

The injectors are a consumable unfortunately.  Petrol Direct Injection is nearly as big a con as dieselgate.  The problems it causes far outweigh the benefits.

Anyway, have your man look over it and go from there.  Prepare yourself for a chunky bill if the injectors need replacing though.

Pjhowy:
So dropped it off at garage, bloke came out and took it down the road and it boosted no missfire 😂 first ever time I’ve felt full boost but anyway, it misfired after that and dropped boost, plugged a snap on scanner on and got code P0299 (this didn’t show up on vag-com for some reason) which is boost regulation not reached or something, so we decided to do a smoke test and found my pcv rubber seal wasn’t sealing correctly to my forge delete kit.

He’s got the car now ordered the part and should be able to pick it up later fitted for 80 quick all in, if that fixes all the problems I’ll be over the moon.

Will keep you guys updated because I hate never getting a conclusion to an issue.  :happy2:

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