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Fluctuating boost!!?!
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Old 23 Mar 2006, 12:30 AM   #1 (permalink)
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Join Date: Oct 2005
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Fluctuating boost!!?!

Just found a new fault on my scoob tonight. (MY01 bugeye)

the scenario:

5th gear, 70mph, 2800ish rpm.

floor the accelerator and the boost goes up to the mapped 1.2 bar, then drops to 0.9, then fluctuates up and down from 1.2 to 0.9 bar.
The revs are not affected by this, im just watching the boost on my gauge and can feel the car boosting, then losing boost, etc etc

Any ideas? Anyone know the symptoms of needing a boost solenoid + pipe clean out? or is this the symptom of a boost leak?

ta for any advice

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Old 23 Mar 2006, 04:42 PM   #2 (permalink)
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Leaky dump valve maybe ??
All the best

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Old 24 Mar 2006, 10:52 PM   #3 (permalink)
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Location: canterbury
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i have the same prob if you get to to the bottom of your prob before me let me know and i will do the same for you. i have checked every think from pipes to boost controller, ecu, intercooler leeks, but still no go boost gos to 15psi then 10psi there must be some one on here who can help us i blame the wastegate at the mo will keep you posted very sad scooby owner!!!!!!!!!!!!!!!!!!!!!!
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Old 14 Apr 2006, 10:48 PM   #4 (permalink)
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if you are feeling up to it disconnect actuator vac pipe and block pipe then short test run to see if still happening take care not to over boost as no wastegate connected if prob still evident then may be damaged turbo at exhaust side
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