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 Posted: Mon Nov 12, 2012 4:33 pm |
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Joined: Jul 06, 2012
Posts: 79
Trade Rating: +4
Location: lancashire
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Hi all. Has anyone else had an issue with "hunting"?
I've had my 138 GTI for 5 years and has had this fault for a while now.
Has been serviced regularly with genuine parts inc spark plugs so I'm hoping it'll be a cheap fix.
Am I right in saying it could be an air leak?
The rev counter needle isn't erratic, drives fine, and fuel consumption seems ok. Never had a warning light on just wondering where to start.
Cheers
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Posted: Mon Nov 12, 2012 4:42 pm |
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Joined: Sep 15, 2012
Posts: 26
Trade Rating: 0
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the problem seems to be the butterfly sticking in the fully closed position, which it is not normally in as it has to be slightly open to allow idle, how ever because the TB is sticking closed the motor has to drive back to open which is more open than the ECU (hysteresis or back lash) expected causing revs to rise and the ecu driving the throttle back to closed then repeats it.....i got a second hand TB problem gone ...or first try a TB learn if you have had the battery off
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Posted: Mon Nov 12, 2012 5:04 pm |
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Joined: Jan 26, 2010
Posts: 3432
Trade Rating: +1
Location: Kent
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Clean or replace the ICV.
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Posted: Tue Nov 13, 2012 4:18 am |
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Joined: Jul 06, 2012
Posts: 79
Trade Rating: +4
Location: lancashire
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Have cleaned throttle body, and also had battery disconnected to see if this might reset the parameter but no such luck.
I'll try an ICV/TB combo and see what happens.
Cheers guys
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Posted: Tue Nov 13, 2012 6:36 am |
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Joined: Feb 08, 2010
Posts: 7045
Trade Rating: +5
Location: In the garage
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| tri-stu wrote: |
| the problem seems to be the butterfly sticking in the fully closed position, which it is not normally in as it has to be slightly open to allow idle, how ever because the TB is sticking closed the motor has to drive back to open which is more open than the ECU (hysteresis or back lash) expected causing revs to rise and the ecu driving the throttle back to closed then repeats it.....i got a second hand TB problem gone ...or first try a TB learn if you have had the battery off |
The throttle butterfly is always 100% closed at idle. There is an extra path for the air to take via the idle control valve at idle speeds.
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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: Tue Nov 13, 2012 11:17 am |
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Joined: Sep 15, 2012
Posts: 26
Trade Rating: 0
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no it has not....you shut the butter fly and the car will stop (fact) or should i say the 180 configure like that ...just read top topic its a 138 sorry
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