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Author Topic: unusual boost cut/limp mode  (Read 910 times)

Offline littleg1979

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unusual boost cut/limp mode
« on: 08 August 2015, 21:43 »
hi guys i have a mk4 golf 1.8t

the other day driving home from work it devloped a miss fire but sorted it self out a few mins up the rd but since then its suffering from a intermitt boost cut which it cut the boost off at 1bar but few mins up the rd it will hit full boost again.... she is well modified and dose nomally run 1.8 bar though the n75 valve which its map to do .... im kinda a little conffuse to why and what its doing as there no eml on or any thing like that so any info would be great many thanks guys
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Offline Dalo Harkin

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Re: unusual boost cut/limp mode
« Reply #1 on: 10 August 2015, 08:40 »
1.8 Bar is high, is it a stage 2 remap?
From what you have said, first thing I would be checking is the spark plugs.
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ARZ K03s, Oettinger Side Skirts, R32 front, Carbon stage 2, Forge 007p (yellow spring), Forge Actuator (yellow spring), Pipercross panel filter with DSG parts, N249 and N112 deleted, SAI deleted, Carbon canister deleted, Rear wiper deleted, Long Life turbo back custom exhaust with 200 cell sports cat, VR6/G60 clutch kit, Creation Motorsport TIP, Catch can, 'Wellycooler', K04 charge pipe, S3 ported inlet manifold - looks pretty standard on the outside though :)

Offline Wazzzer

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Re: unusual boost cut/limp mode
« Reply #2 on: 10 August 2015, 18:16 »
If it's an AGU you won't get an EML light. Do some logs to see when it's happening and see what the MAF and N75 are up to. If it's not an AGU you can log the requested vs actual boost levels too
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1999 1.8T: R-Tech remap - 225bhp/256lb/ft : K03s : THS FMIC : THS PCR pipe : 2.5" stainless exhaust : THS FR3 Engine mounts : G60/VR6 clutch : Calibra Yellow injectors : VR6 MAF : Devils Own WMI : Forge 007p : Carbonio CAI : Leon Cupra R Brembos : FK AK Street coilovers : Votex skirts : Anniversary front : click ---> http://www.golfgtiforum.co.uk/index.php?topic=92175
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