All Things Mk5 > How to Guides / Troubleshooting
Spark plug gaps
AJP:
Well well well. I don't think I'm out of the woods, just yet.
The 'new' misfire I reported back on 10th October has now occured at least three times - in the exact same circumstances. Going from 3rd to 4th at full chat, as soon as the throttle's down in 4th it's like hitting a brick wall. Complete loss of power for a split second with a big brrapp from the exhaust. Then all's fine, like nothing happened. It's quite puzzling.
Answers on a postcard.
pudding:
Sounds like a momentary lean condition. The transient fuel demand when flooring it after a gear change can be pretty huge.
Either that or something is amiss and the ECU is pulling back. Over boosting maybe? Anything revealing in the logs? As always, best to use VCDS in turbo mode.
AJP:
--- Quote from: Pudding on November 17, 2016, 07:28:28 pm ---Sounds like a momentary lean condition. The transient fuel demand when flooring it after a gear change can be pretty huge.
Either that or something is amiss and the ECU is pulling back. Over boosting maybe? Anything revealing in the logs? As always, best to use VCDS in turbo mode.
--- End quote ---
Did some logs a while ago before the refurbed injectors went in (and the misfire was really bad) and the car behaved itself so left us clueless.
Since fitting the injectors it's like a different car... apart from this very rare but specific hiccup which manifested after the injectors went in.
I don't have VCDS, and even if I did I'd be waiting weeks or months for it to happen again. It seldom happens. I don't know if the fact I'm still on a Stage 2 map but with a Loba pump has any bearing on it, but logic tells me that if anything I should have more fuel headroom than if I was on 2+, so I doubt that.
I know I'm just guessing without doing more logging though. Although if it was momentarily overboosting like you suggest then it might have stored a code.
r5gtt:
Oh dear :doh: back again :thinking:
Have you checked your fuel pressure sensor?
AJP:
--- Quote from: r5gtt on November 17, 2016, 08:44:24 pm ---Oh dear :doh: back again :thinking:
Have you checked your fuel pressure sensor?
--- End quote ---
Haven't really checked anything yet. I'll start by seeing if there are any codes stored and go from there. It'll be going in for the mk7 brakes soon so I'll get it scanned while it's in.
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