This is tearing me down....I need some useful hints!

I get diffent AFR between LH/RH cyl.banks under acceleration

- Swapped injector drivers
- Swapped side of the injectors
- Checked for vacuum leaks
- Checked for exhaust leaks
- Relocated both WBO2 bung at the same distance from cyl.head.
- Swapped side of the WBO2 units/sensorn
- Disconnected all the other inputs from TPS/MAP... to eliminate elec.fault.
- Grounded all the WBO2 eq at the same place
-> Still no change

Se picture from scan

Could a vacuum leak between intake/head to the lifter valley cause this?
Why is it diffrent when I accelerate and not else?

Purple- RH AFR
Yellow- LH AFR
Red- MAP
Green- TPS
Black - RPM

 

Just watching.

 

Try swapping the injector wiring harnesses. Maybe it's possible that one side has more resistance than the other?

Other than that, I haven't a clue. Your car hates you. lol.
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Oops, just figured out you're not running TBI. Has the car always done this?

 

Probably have a misfire. You're getting o2 from somewhere, and it's hard to detect a fully misfiring cylinder if you've got a big shaky engine. Could be a bad plug that jumps a crack during load. Could be a plug wire. Could be distributor cap. Could be THAT cylinder head is not grounded well (ground both).

 

I swapped the harness (drivers) with no result.

Oh, I forgott the first thing I did
- New Plugs and new wires MSD 8.5 mm, gap set to 0.9mm

Did a compression test today, ( had to remove the headers)
8.5-9.0 on all...........

Its not that shaky and it feels smooth and the log (AFR) is stable so I dont think its a missfire..........

Search goes on.............. will put an xtra ground to RH cyl head.

Time to mount back the headers and adjust the valves and try some other things. Keep you updated and let all me know all ideas!

 

Suspect burnt valves, will remove the heads and have a look

 

found 3 burnt ex.valves.

Had them fixed and put it together and still the same reuslt

I need more ideas!