Entire bank 2 misfire

[jlglr4]

Fuel pressure shouldn’t affect one bank only. I’d be thinking the vvt or cam solenoid as someone else mentioned, or o2 sensor - except op said fuel trims look okay. Fuel trims checked after warm up I trust - if not, check again warmed up.

The VVTs are oil pressure actuated as I understand it. solenoid opens a valve to let oil pressure adjust cam timing. Oil pressure is also supposed to keep the timing chain tensioners tight. So, while the solenoid is most likely, I’m also wondering if there might be an oil delivery problem on that side of the motor.

 

[Cowinthefog]

Opposite of fun....ha! That's funny.

So it did it agin to my wife again today separated by several hours. This definitely seems to be isolated to cold starts. The second time she said it took 4 tries and still did it, but when I got there as she shut it off for the 4th time, it of course worked fine for me....Murphy's law strikes again! That guy.....

Anyone know of a solid wag to isolate pumps? When using the iCarsoft to look at high and low pressure sensor voltages, LP is around 2.3 and HP is around 1.25. HP reads about 470 in drive and if I goose it a little to 1300 rpm the pressure rises to close to that.

Josh

 

[Cowinthefog]

Jlgl4-I wonder about the electrics as well since it is one bank only. And have only gotten misfire codes-though none today even after two episodes. When I did the timing chains this weekend, everything LOOKED clean and the vvt buttons moved freely as well as whatever mechanism is inside the solenoid on the front covers. I know cleanliness isn't a definitive test, but thought it was a good sign. I don't know how to test those solenoids yet.

 

[jlglr4]

most vvts you just pull them off and put 12v to them - see if they move (or click if enclosed). not sure if these have anything else that can go wrong with them. i haven’t had to mess with them yet.

 

[Cowinthefog]

Still does it intermittently. It only does it at start up idling. Once it has done it and cleared itself, it seems to be fine the rest of the day. It does not always do it first thing in the morning, but the engine does seem to be cold or cooled off. It always does it immediately when it happens. Out of curiosity, I unplugged each of the 4 sensors (cam position and vvt) on bank 2 (driver side) to see if symptoms mimic the issue. The ground is clean and tight there, wire checks good. None had any perceptible affect when unplugged and node codes came up. I put it in drive each time with no issues while unplugged.

Josh