revs hunting after overrun?

[davidol]

Hiya guys, occassionally the revs hunt up and down on my car after rolling up to a standstill just after dipping the clutch to come to a complete standstill, Jock at westec thought it might been because the spring wasnt strong enough in my Forge dumpvalve which iIve now changed but it made no difference. If i rev the car and then allow it to settle to idle it clears the problem...any suggestions?

It only does it once in a while but i'd like to sort the small problem before it turns into a big one!

Dave

 

[Jonzy]

Mine went through a phase of that, then I took the n249 off the car and it stopped.

 

[davidol]

what does the N249 do and isnt it there for a purpose?

 

[Jonzy]

Opens the dv when the ecu detects a boost spike. Car has run so much better since I took it off.

 

[Stevo1]

Before you try anything major, just check if your clutch sensor clip (white cone shaped clip just above the clutch pedal) is FIRMLY in place. Mine came loose and it revved after gearchanges.

 

[flashbsd]

try doing a throttlebody reset, cured mine

 

[ibizacupra]

shifty shifty had what sound slike similar and it was a busted clutch pedal switch... check it out for being ok..

 

[davidol]

ok cheers guys, just had REVO today from Grant and im happy only spiking to 1-17psi but then settling down to 15psi....shouldnt it be higher than this? any suggestions?

 

[Daz_gibbo]

20Psi spike I was hitting on st1, sometimes more.

 

[Daz_gibbo]

I can also vouch for the clutch switch too. Was pissing me off something terrible.

 

[davidol]

daz have you got vagcom? if you havent no worries i'll ask philw if he can take a look when he gets 5 mins....do ou know if having a knackered maf would put u down on boost?

 

[Daz_gibbo]

Yeah I have VAGCOM.

 

[Daz_gibbo]

When my MAF was kaput showing max 90g/s, it made no difference to my boost

 

[davidol]

do you mind checking mine at some point? what exactly does the MAF affect then when its broken? any suggestions why it may not be spiking as high as it should...it may just be that my boost gauge is **** but i dont think so, would be worth doing some live mapping to check actual vs. requested

 

[Daz_gibbo]

I'll bring it too the meet if you like?

 

[Daz_gibbo]

Or if you want it earlier let me know. Sure we could sort something out.

 

[davidol]

yeah that'd be great Daz? do you know how to interpert the information VAGcom will tell us about the running of the car so we can hopefully sort the problem? i genuinely dont mean to be cheeky when i say that so please dont take it that way its just for i know you may have just got it and expect me to know how to use it! I dont know! havent got a clue!

 

[Daz_gibbo]

I know a bit. Im not saying im an expert (far from) but im sure we can narrow it down with the info. If we can't I'll put the info on here for others to have a looksey anyway.

 

[davidol]

lovely cheers mate i appreciate it!