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 Posted: Sat Mar 26, 2011 2:21 pm |
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Joined: Nov 11, 2010
Posts: 257
Trade Rating: +3
Location: UK, Isle of Man
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ok folks i have an issue with my 2.0 GTI
on start up it takes a few turns longer than id expect to start. (but it always does on 3-5 turns of starter).
Secondly it doesnt idle correctly, hunts.. like up and down marginally with the odd splutter. first thought was ICV however no error light, and the mechanic suggested it was just a dirty throttle body as anything else would show up as an error. The throttle body has been cleaned and there is no change.
So now on to why im considering the CAT, when reving the car parked up the engine sounds fine however when booting it some you can hear it (or the exhaust) sounds rough, like an old blowey engine. especially with passenger window down and along side walls where it echos off. the rougher sound doesnt seem to come from the rear and middle section looks pretty new. so possibly cat failing?
Also though possibly not conected the car is momentarily sluggish on launch, ie thinks of stalling then takes off, all in a millisecond sort of thing.
At 4k plus the car pulls fantastic, infact going up the mountain last week it pulled 115mph easily with more to give. so im pressuming the main sensors are ok???
On a note french cars are new to me and i may just be expecting to much in some cases.
So for anyone that is reading, thnakyou for your time and any ideas or expertise you have are and is very welcome.
thankyou in advance. Dave
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Posted: Sun Mar 27, 2011 7:36 am |
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Joined: Nov 11, 2010
Posts: 257
Trade Rating: +3
Location: UK, Isle of Man
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anybody?
please 
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Posted: Sun Mar 27, 2011 7:53 am |
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Joined: Jul 13, 2010
Posts: 1032
Trade Rating: +10
Location: sutton surrey/welwyn garden city
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I've heard people clean something called a map or maf sensor, ask your mechanic, sorry I can't be more helpful
cheers
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| You never really learn to swear until you learn to drive | |
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Posted: Sun Mar 27, 2011 11:14 am |
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Joined: Nov 11, 2010
Posts: 257
Trade Rating: +3
Location: UK, Isle of Man
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yeah worth a go i guess, the maf is the mass air flow sensor, think its in the throttlebody on these is it?
in fact if i unplug it that should steady the revs if faulty maybe?
would love it to be that.
thanks mate, dont no why i dint think to try that.
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Posted: Sun Mar 27, 2011 11:20 am |
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Joined: Feb 08, 2010
Posts: 7045
Trade Rating: +5
Location: In the garage
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Don't waste your time looking for a MAF sensor...there isn't one.
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| 2001 GTi 138, Bilstein Sprint dampers, H&R springs, 21mm Peugeot Sport torsion bars, 22mm rear ARB, Peugeot Sport Group A wishbones, 283mm discs, Goodridge stainless hoses, Maniflow 304 grade 4-2-1 2.5" manifold and system, 200 cell cat, Richard Longman head, 45mm Jenvey throttle bodies, 9.5mm TB spacers, 90mm air horns, Jenvey throttle linkage, Jenvey fuel rail, Aeromotive and Goodridge fuel fittings and braided hose, ITG sausage filter, Radtec custom radiator, Piper Ultimate Road cams, Piper vernier pulleys, Omex 600 ECU. Saxo electric PAS pump, Vibra Technics engine mounts. Samco coolant hoses, TTV steel flywheel, 4.76 final drive ratio, 307 CC 180 ratios. 2019 BMW 530i. 2017 Mercedes C300 convertible. | |
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Posted: Sun Mar 27, 2011 11:45 am |
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Joined: Nov 11, 2010
Posts: 257
Trade Rating: +3
Location: UK, Isle of Man
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| Edward wrote: |
| Don't waste your time looking for a MAF sensor...there isn't one. |
guess its not that then. have you any other ideas?
do you know if no fault light rules ICV or lambda out?
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Posted: Mon Mar 28, 2011 9:33 am |
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Joined: Nov 11, 2010
Posts: 257
Trade Rating: +3
Location: UK, Isle of Man
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any body had any issues with vacuum hoses? just occured that this could also cause the irregular idle.
happend to anyone else? and if so which hose was it?
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Posted: Mon Mar 28, 2011 9:42 am |
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Joined: Feb 07, 2010
Posts: 1792
Trade Rating: +12
Location: Bridgnorth, Nr Wolverhampton
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i have this, takes a few turns more than normal, sometimes i have to pump the accelerator to get it going.
idles a bit erratically, sometimes the engine revs sort of pulse up and down.
ive changed:
ICV
Throttle position sensor
MAP sensor
Cleaned and replaced seals on TB
Cleaned all the crap out and replaced seals on my intake manifold
my next step is lambda sensor as CDvRS on this forum had similar symptoms and replacing the front lamda sorted it out, however i cant get mine off 
i brought a code reader as well but mine isnt bringing up any codes, it brought up throttle position sensor but since clearing that it hasnt again.
hope this helps
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Posted: Mon Mar 28, 2011 2:23 pm |
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Joined: Nov 11, 2010
Posts: 257
Trade Rating: +3
Location: UK, Isle of Man
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yeah, that sounds like it. i know the lambda can be capable of it. only difference between our symptoms is that i never need the accelerator to start...... yet lol
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