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Discussion Starter #1
Had ongoing issues for a while with my 07 FN2.

Doesn't feel as responsive, jerks sometimes when changing gears, bottom end power feels weaker. Feel like somethings holding the car back.

This what I've done:

Had a dodgy custom made intake that was filthy - replaced this with HKS RSK
New fuel filter
New o2 sensor

Had the front two brake calipers refurbed with the new piston kits - does feel better but not 100% convinced they are totally sorted. If they are catching still I don't think it would be enough to cause this feeling in the car.

Anything else that could sort this?

Car was fully service a few days ago and I fitted the HKS RSK yesterday. Could the car take time to adjust to the new intake? Or should it instantly feel better? Few people advised the in take was causing the issue and when I was installing RSK I noticed the rubber intake pipe had a split in it so this wouldn't have helped either.

I'm now thinking along the lines of dirty fuel injector and/or the fuel pump being done in?

Thanks in advance
 

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Plug your flashpro in and take some datalogs. What mileage is the car at? Have the plugs been changed?
 

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Discussion Starter #3
Confession time - I haven't really got a flashpro - got a bit carried away with my signature when I first joined. Funny that because I was just about to take them off

Cars on around 70k - yes the plugs have been changed
 

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When installing the hks have you made sure that the maf lines up perfectly and that the air will hit it face on?
 

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Hmmm, could be one of quite a few things tbh. Could be a sensor issue, lambda etc. Getting a code reader on would be your best bet.
 

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Discussion Starter #7
Done that - replaced the lambda sensor aswell - I'm not bothered what the issue is - aslong as I know exactly what the issue is -

sick of throwing cash it - replacing parts and hoping for the best

need to find a tuning/diagnostics specialist to pinpoint the issue - might even end up taking to TDI north
 

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Discussion Starter #8
It's never threw up check engine light - or gave any codes on the reader

I know it might sound daft but might try one of those fuel system/injector cleaners that you put in your car - but get a good one
 

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Have you left the handbrake on? :D

Dunno then mate, best take it to a dealer.

Did you get it second hand? Might be worth trying to check it's running the stock map.

Edit. I totally missed your post #7.
 

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Discussion Starter #12
Yeah bought it 2nd hand but it was fine when I bought it.

I drove from Newcastle to Bristol and back a while ago and gave it a bit of a beasting.
Since then it deteriorated and cant get it driving like that again
 

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Might need to get the car mapped to suit the hks intake.

some people have issues with flatspots when changing intakes
 

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Sounds like Maf sensor is on its way out if you ask me, I would personally start with that
 

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I second ghost_bhp.

Had an RSK on mine and ran very jerky without the proper map
 

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Discussion Starter #16
But it was like this before I got the RSK.

Car had a custom made intake on it when I bought it...was fine. Then eventually performance started going down hill.
Thought it was fuel filter, o2 sensor & brake calipers...all been sorted....slight better but still not great.
Replaced the intake with HKS expected immediate results....unfortunately not.

Now thinking could be fuel pump, now someone's saying replaced MAF sensor.

This could go one forever


Sent from my iPhone using Tapatalk
 

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Discussion Starter #20
I've had a new clutch kit put in not long ago....I think fuel aswell
I know this might sound daft...but those additives you get from halfords that you pour into car to clean the fuel system/injectors....reckon they're worth a try? I'll get one of the decent ones though
 
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