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- City
- BALLYCLARE
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- Non-US
- Country
- United Kingdom
- What I Drive
- 2015 S4
Hi new to here was just looking a bit of help as this is turning to be a headache I have the dreaded misfire at idle and only idle car runs perfect at WOT it is MRC staged 2 with 55k miles.
Getting cylinders 2,3,4,5 misfire codes
Number 6 does have some missfires not enough to trigger code. When driving above 2k rpm no missfires while watching the data and car pull like a train.
Don't think it would be coils as this would break up especially in the higher rpms due too dwell times. I have digital gauge and can see that when she missfires she goes upwards of 16.2:1 AFR and then ECU corrects it to about 13.6 then 14.7 too 16.2 constantly
Soo far it has been
Compression checked
Smoke tested for vacuum leaks
S/c intercooler cores pressure tested
Carbon cleaned although the crec as I'm aware doesn't suffer due to dual port injection and it wasn't bad at all
Injectors hold pressure they have been cleaned tested and new seals
Fuel pump tests ok holds near 5 bar of pressure under WOT
New pcv valve as it was whistling and got codes for pcv performance
Serviced with new sparkplugs
New intake manifold seals
I have heard of the cats giving bother but i would have thought I would get an efficiency code at least any advice is welcome
Getting cylinders 2,3,4,5 misfire codes
Number 6 does have some missfires not enough to trigger code. When driving above 2k rpm no missfires while watching the data and car pull like a train.
Don't think it would be coils as this would break up especially in the higher rpms due too dwell times. I have digital gauge and can see that when she missfires she goes upwards of 16.2:1 AFR and then ECU corrects it to about 13.6 then 14.7 too 16.2 constantly
Soo far it has been
Compression checked
Smoke tested for vacuum leaks
S/c intercooler cores pressure tested
Carbon cleaned although the crec as I'm aware doesn't suffer due to dual port injection and it wasn't bad at all
Injectors hold pressure they have been cleaned tested and new seals
Fuel pump tests ok holds near 5 bar of pressure under WOT
New pcv valve as it was whistling and got codes for pcv performance
Serviced with new sparkplugs
New intake manifold seals
I have heard of the cats giving bother but i would have thought I would get an efficiency code at least any advice is welcome
