misfire under boost, flashing CEL
- Thread starter JoeeS3
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could it just be a bad coilpack, they were recently just changed by audi though?
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correct plugs?
disturbed the wiring?
damaged the coils on removal?
as suggested anything helpfully logged on faultcodes?
other misfires can be injectors/wiring harness if disturbed
vcds or faultcode reader will help you investigate it
disturbed the wiring?
damaged the coils on removal?
as suggested anything helpfully logged on faultcodes?
other misfires can be injectors/wiring harness if disturbed
vcds or faultcode reader will help you investigate it
when i checked the other day i had two codes i cant remember the exact codes but it was
multiple cylinder misfire
lamda sensor 1 temp sensor high (which i assume is the pre-cat lambda sensor)
sorry that is not much info but i will try and get it scanned again tomorrow
multiple cylinder misfire
lamda sensor 1 temp sensor high (which i assume is the pre-cat lambda sensor)
sorry that is not much info but i will try and get it scanned again tomorrow
panderoo
Registered User
I had multiple miss-fires recently under load, replaced all coils and plugs with TFSi ones and it was gone.
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Lambda fault could be potentially the reason... faulty lambda leads to incorrect fuelling... misfires on an otherwise solid ignition system points too a rich mixture and this would also cause misfires...
<tuffty/>
i think if it sensor 1 bank 1 that would be the wideband lambda bud. having very similar issues but iv narrowed it down to coil pack loom
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Would prefer to verify this is the issue tbh... logging as Bill has mentioned would be a good idea or get yourself to a dyno for fault finding etc...
If you say sensor one and assuming yours is a facelift S3 based on having the coils changed and your username (model, year, engine code always a good thing to include when asking for help in diagnostics) and assuming 'sensor 1' then its the wideband sensor at the top of the downpipe
Logging AFR on a dyno using a separate lambda (normally inserted into the exhaust) and logging via VCDS would confirm if the ECU is seeing a different AFR to what it actually is...
<tuffty/>
If you say sensor one and assuming yours is a facelift S3 based on having the coils changed and your username (model, year, engine code always a good thing to include when asking for help in diagnostics) and assuming 'sensor 1' then its the wideband sensor at the top of the downpipe
Logging AFR on a dyno using a separate lambda (normally inserted into the exhaust) and logging via VCDS would confirm if the ECU is seeing a different AFR to what it actually is...
<tuffty/>
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Look in the stickies... there is a link to a thread I wrote detailing this (the 'read first before posting' one)
<tuffty/>
