Author Topic: S4 B5 Knocking/Quick Juddering when coming into boost  (Read 164 times)

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Offline maxpearson

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S4 B5 Knocking/Quick Juddering when coming into boost
« on: November 15, 2017, 12:04:33 am »
Only happens when you get into boost in say 4th and 5th fear and you put your foot down halfway or so, as it builds up the car starts almost boost cutting, but if you just plant your foot it gets into boost fine. Has anyone has this happen to them? Cheers
97 A4 B5

Online Brett

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Re: S4 B5 Knocking/Quick Juddering when coming into boost
« Reply #1 on: November 15, 2017, 09:05:29 am »
Check the throttle body boot. Probably torn
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Offline 00quattro00

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Re: S4 B5 Knocking/Quick Juddering when coming into boost
« Reply #2 on: November 15, 2017, 04:34:43 pm »
Did you buy that one from chch with the built engine?
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Offline GLIDN

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Re: S4 B5 Knocking/Quick Juddering when coming into boost
« Reply #3 on: November 15, 2017, 05:02:08 pm »
This issue can be related to all the following possibilities.

Faulty/worn/incorrectly gapped spark plugs
Boost leak
Faulty Airflow sensor
Failing coil packs
Failing Ignition amplifier
Failing/faulty N75
Failing/faulty EGT (exhaust gas temperature sensor)
Failing/faulty Primary 02 Sensors
Possibly sticking wastegate on OEM turbos
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