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Author Topic: Miss fire?  (Read 5673 times)

Offline micky 32

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Miss fire?
« on: January 31, 2010, 07:29:14 pm »
I noticed today especially in 5th at WOT and at high speed the car for a split second feels like it cuts power and does it intermittently as it accelerates. Is this the begining of a coil pack failure because the car under normal driving and not floored it doesn't do it at all. I have put it on vagcom and there are no miss fire fault codes.
« Last Edit: January 31, 2010, 07:33:14 pm by micky 32 »
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Offline bacillus

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Re: Miss fire?
« Reply #1 on: January 31, 2010, 07:34:36 pm »
Did you also log your requested and actual fuel rail pressure and boost?
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Offline micky 32

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Re: Miss fire?
« Reply #2 on: January 31, 2010, 07:42:50 pm »
No not yet. I'm running a uprated pump with a KO4. when i say power cut it's only for a very very split second so i'm assuming it's a missfire?
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Offline john_o

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Re: Miss fire?
« Reply #3 on: January 31, 2010, 07:43:25 pm »
it would also be good for us to know your cars current spec std or modified.
year of car , mileage etc  :happy2:
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Offline chungster

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Re: Miss fire?
« Reply #4 on: January 31, 2010, 07:43:52 pm »
how much fuel did u have in the car when it happend?
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Offline micky 32

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Re: Miss fire?
« Reply #5 on: January 31, 2010, 08:10:33 pm »
08 Octavia vRS. Evom's, pump, full Miltek, forge twintercooler, KO4... 56k. Still on original coilpacks. Half tank of fuel. The car gives intermittent like jerks. I have a feeling i'm lucky to be on the ori coils at 56k?
« Last Edit: January 31, 2010, 08:13:25 pm by micky 32 »
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Offline chungster

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Re: Miss fire?
« Reply #6 on: January 31, 2010, 08:14:40 pm »
oh what remap you got?
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Offline rubber toe

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Re: Miss fire?
« Reply #7 on: January 31, 2010, 08:20:24 pm »
i had this problem last summer , only happened on hard accelaration/wot in  the higher gears .
no fault codes came up , changed the coilpacks and spark plugs and never had any probs since  :happy2:
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Offline Janner_Sy

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Re: Miss fire?
« Reply #8 on: January 31, 2010, 09:36:31 pm »
micky is revo stage 3. 

I have  similar thing on mine at the moment. its a recent addition.

ive changed MAF to no avail.

next im going to change the MAP sensor, the spark plugs, if its still there ill be looking into coilpacks, lambda sensors etc.

mater (carl) had misfires recently and i think he changed his MAF and MAP sensor on friday so he might be able to elaborate on his issues and see if his new sensors worked
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Offline Poverty

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Re: Miss fire?
« Reply #9 on: January 31, 2010, 10:06:51 pm »
Quote from: micky 32 on January 31, 2010, 08:10:33 pm
08 Octavia vRS. Evom's, pump, full Miltek, forge twintercooler, KO4... 56k. Still on original coilpacks. Half tank of fuel. The car gives intermittent like jerks. I have a feeling i'm lucky to be on the ori coils at 56k?

Sounds like you just have the 5200rpm flat spot that alot of people suffer from. Coilpacks and plugs dont make a difference to it, and neither did a new MAF.

Im still working on trying to find out why exactly it does it, and potentially will have made some progress on it shortly. Will know in a week or two.
« Last Edit: January 31, 2010, 10:08:25 pm by Poverty »
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Offline Hedge

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Re: Miss fire?
« Reply #10 on: January 31, 2010, 10:07:57 pm »
Micky, have you disconnected the battery recently?  :smiley:
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Offline micky 32

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Re: Miss fire?
« Reply #11 on: January 31, 2010, 11:08:39 pm »
Poverty it's not the flat spot you are talking about, this is totally a different thing. This suddenly happened today and it can happen at 3500 rpm at WOT in a high gear. Funnily i went out for a drive this evening and it was ok. I do have a nice set of RS4 coilpacks i'll try them if it returns. Hedge no i haven't disconnected the battery recently.
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Offline vRStu

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Re: Miss fire?
« Reply #12 on: January 31, 2010, 11:12:08 pm »
Quote from: Hedge on January 31, 2010, 10:07:57 pm
Micky, have you disconnected the battery recently?  :smiley:

Lol - I know what you're thinking Mr H ;-)
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Offline Janner_Sy

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Re: Miss fire?
« Reply #13 on: January 31, 2010, 11:12:27 pm »
micky if you still have VCDS handy i reckon yuo should do some logs. one of the guys like hedge or vRStu are besty placed to tel you what blocks to log.  but if you can make your car do it again you might be able to see what is causing the issue.

id still look into the MAF/MAP sensors etc
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Offline Janner_Sy

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Re: Miss fire?
« Reply #14 on: January 31, 2010, 11:13:53 pm »
Quote from: vRStu on January 31, 2010, 11:12:08 pm
Quote from: Hedge on January 31, 2010, 10:07:57 pm
Micky, have you disconnected the battery recently?  :smiley:

Lol - I know what you're thinking Mr H ;-)

what sort of issue would that cause. my misfire seemed to occur shortly after my i ran my battery flat. same day though i also had my cat back and new bosche spark plugs fitted as well
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