All Things Mk5 > How to Guides / Troubleshooting
Carbon on valves?
SANDEGTI:
--- Quote from: Pudding on October 07, 2022, 11:40:30 am ---Yeah, it's cheaper to drink beer :grin:
I should clarify.....the idle got rough again when I went to LiquiMoly Anonymous for a month, but then smoothed out again whilst still sober :grin:
--- End quote ---
:grin: Well done for sticking it out.
Well, the magic liquid came this morning and as soon as I finished some work we put £40 in and put it in right after. Gave it a bit of a beating on the dual carriage way, stayed in 5th gear for most the way at 3.5k revs with little stops for about 45 minutes. I must say for the first time in MONTHS, we pulled over to Lidl and the car wasn't jumping about like it normally does. Usually it's fine when cold but as soon as it gets up to temp it idles a bit funny. The car was hot and no issues in that respect so what a result :smiley:
Not the only thing I noticed, I swear the car has got quieter. At 4k revs it now sounds like what it used to at 3k revs if that makes sense? And the placebo is strong, the car is picking up quicker :signLOL:
OP, would 100% recommend this for £7. Even if it doesn't fix it in the long run at least you know what the issue is. Surprised by the results so far.
pudding:
Another satisfied customer :smiley: It seems to work a lot of people. If there's no difference, the injectors are fine.
Watch that smooth idle habit though, it gets addictive :grin:
Mine's the same. Pulls like a train when it's cold but the more miles I do and the hotter it gets, the worse the idle and low end pull get. I know what you mean, the engine does run a heck of a lot quieter and smoother when the injectors are working properly. Unfortunately, it doesn't seem to last.....hence my Liquimoly addiction :grin: Still, it's a good band aid until you get around to a walnut blast and injector replacement.
SANDEGTI:
My partner thought I was mad (she's not wrong) when I said I ordered injector cleaner. I've been going on about it for the last few days and I think she's getting sick of me. I just told her it's £400 for new injectors or Liqui Molly once a month for a year, up to her now :grin:
I'm gonna keep an eye out on the MPG to see if there's any improvement there.
In your opinion, is it worth getting the inlet cleaned? I only ask because I'm planning a trip to R Tech in the next month or so. I've read a lot about it and everyone says it comes clean but can't notice a difference. Is it just a maintenance thing?
pudding:
Haha, my missus's eyes glaze over whenever I talk about the car, followed by a big yawn :grin: Injectors are £200 each for mine :sad1:
I can't say I noticed an mpg improvement using it but 35-40mpg is easily achievable anyway if driven gently enough.
Carbon build up can get bad enough to cause warmup misfires, but if yours is smooth when cold, I wouldn't worry about it for now, but definitely get it done whilst the inlet manifold is off during injector replacement :happy2:
AKS Tuning did a walnut blast on mine, must be getting on for 4 years ago now, and I can't say I noticed anything. They did say my valves weren't as bad as most they see, so that could be why.
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