Audi S6+ drivers side all cylinder missfire

[Harvester]

Hello , I have problem and I hope somebody can help me . I have permanent missfire on 5,6,7,8 cylinders on my S6+ . One day car goes smoothly , another day no . Any ideas ? I had problems with injectors before , but i ve solved it .Thank you

[hunker7]

Hello , I have problem and I hope somebody can help me . I have permanent missfire on 5,6,7,8 cylinders on my S6+ . One day car goes smoothly , another day no . Any ideas ? I had problems with injectors before , but i ve solved it .Thank you

I am not sure, but does it have POS on V8's?

[RichLV]

Hello , I have problem and I hope somebody can help me . I have permanent missfire on 5,6,7,8 cylinders on my S6+ . One day car goes smoothly , another day no . Any ideas ? I had problems with injectors before , but i ve solved it .Thank you

The standard 4.2 V8 on S6 has ignition distributors. Not sure about the S6+, maybe it has too.

You're having misfires on one bank, first check if it has a distributor in the back of the misfiring bank, if yes, then check the rotor and the cap. If those are fine, you go higher up the chain - spark wires, plugs, ignition coils.

*EDIT*
Nope, the S6+ has coil-on-plug and YES, it has POS's, one for each bank. Go for the POS first.

[Kieron20V]

Check earth connections on back of head coming from coilpack harness.

Sent from apollo 13 using tapatalk

[domas]

and swap POS around to see if misfire moves to another bank

[UrS4boy]

Nope, the S6+ has coil-on-plug and YES, it has POS's, one for each bank. Go for the POS first.

The S6plus is indeed coilpack on plug but unlike the later V8s, it has external POSs, not integral internal POSs. In fact the POSs are the same as the early A4 1.8T POSs, i.e. the input side has 5 pins and the out put side has 4 pins. The AHK just has two of these. http://audi.7zap.com/en/rdw/audi+s6+.../905-905035/#1

PN is 4D0905351 Huco and Bosch both make them. https://www.ecstuning.com/Audi-B5_A4...ews/ES2515501/

[Harvester]

urS4boy : Thank you very much for so informative answer .

I have changed Huco replacement today but without bigger effect . Car run smoothly but maybe tomorow it will be the same as yesterday .
I had problem with injectors , because autogas system was in the car before and i think another one injector is gone.
Do you have original number of injectors ?

[domas]

it is likely that the injector harness was cut and spliced to LPG ecu. Typically those jobs are not done properly.

[Harvester]

I know what you mean , but this harness was made with conectors without cutting original wires . This was first thing I checked

[UrS4boy]

urS4boy : Thank you very much for so informative answer .
I have changed Huco replacement today but without bigger effect . Car run smoothly but maybe tomorow it will be the same as yesterday .I had problem with injectors , because autogas system was in the car before and i think another one injector is gone.
Do you have original number of injectors ?

077133551L

[GT500]

do a compression check. I bet it's a tooth out on cam timing. I had an RS4 do the same.

[UrS4boy]

077133551L Item 4 in the diagram: http://audi.7zap.com/en/rdw/audi+s6+.../133-133097/#4 (you can find these part numbers on your own using 7Zap)

[Harvester]

Thank you very much . Didnt know 7zap before .

I was trying to find this injector , but with no result . End of production . Do you know some webpage where to buy uprated new injectors , or something I can use ?

[UrS4boy]

Thank you very much . Didnt know 7zap before .
I was trying to find this injector , but with no result . End of production . Do you know some webpage where to buy uprated new injectors , or something I can use ?

7Zap tutorial: http://www.s2forum.com/forum/showthr...22Ekaterina%22

Technical specs on the 0280150847 injectors:

BOSCH 0 280 150 847 (0280150847) Injector
Manufacturer BOSCH
Number 0 280 150 847
Description Injector
Static flow rate at 3 bar, medium N-Heptane [g/min] 1198,6
Resistance [Ohm] 4,6
Fuel Mixture Formation Petrol Injection

The are also known as 160 lb/hr injectors

REF: https://infopart.org/bosch-0280150847-part