[paapaa]

can misfiring do error: P0174,bank 2 and cyl 4-6 goes lean?

at idle P0306 = cylinder 6 misfiring...it must be either way..
lean condition does the misfiring or misfiring does so that it goes lean..

[rader1]

A misfire should cause a rich condition due to not burning the air/fuel charge. Since it's all the cylinders in bank 2(I understand "4-6" to mean 4 through 6) I would think it may actually be a bank 2 O2 sensor failure.

[paapaa]

Originally Posted by rader1

A misfire should cause a rich condition due to not burning the air/fuel charge. Since it's all the cylinders in bank 2(I understand "4-6" to mean 4 through 6) I would think it may actually be a bank 2 O2 sensor failure.

yes 4 through 6.

-first appeared(not anymore):HO2S B2 S1 RANGE / STUCK RICH
-then (not anymore):Oxygen Sensor Circuit Slow Response (Bank2, Sensor1)

-last ones,allmost every day:P0174 System Too Lean (Bank 2)
+ latest P0306, misfiring cyl 6.

intake vacuum leaks not found as much as you can search without going under car.smoke machine ordered (cheap one) + bank 2 O2 sensor too.
because the misfiring cyl 6 i thought everything maybe is because misfiring...but maybe i should wait and change the O2 sensor first and
use the smoke machine.

[paapaa]

something to add...

previously when it was raining i noticed the problem occured like multiplied stronger than when not raining.

this morning again when raining...the hick ups were again much stronger.
water reflects now to somewhere with this problem.

can rain affect to the possible intake vacuum leak or to the O2 bank 2 sensor1?
(will update details next week, allready have new sensor + spark plugs + smoke machine to see possible leak)

[paapaa]

new spark plugs...and hick ups are worse.
changed the bank 2 pre cat O2 sensor-not helped.

can OEM catted downpipes help on this? now they try to swap
injectors 123 to 456.

[paapaa]

Originally Posted by paapaa

new spark plugs...and hick ups are worse.
changed the bank 2 pre cat O2 sensor-not helped.

can OEM catted downpipes help on this? now they try to swap
injectors 123 to 456.

injectors changed-no help
next they change the 2/2 of the pre cat O2 sensors + all coils

[Luther@Fleming Automotive]

Have the intake valves cleaned.

[paapaa]

Originally Posted by fleming77

Have the intake valves cleaned.

thanks for one possible solution.i will update this thread when car is finally repaired.

[masitr]

Any updates? I am having the same issue.

[garyhgaryh]

Yes, any updates?

[troy2003]

Lord almighty why are these threads never ever updated with the fixes. These threads are always filled with speculation and then never any follow-up. I'm having this issue, has anybody had it that knows the fix??????

[troy2003]

Bump again for fixes......