Your smoke test should of shown any inlet manifold leaks ....or have you had the manifold off again since the first smoke test ?
I would of thought if fuel pressure is low under load it would show on both banks , and you also said that under heavy load your fuel corrections where only 3/ 4 % ......fuel pressure is most critical under heavy load so the corrections should of shown this .....but still worth doing to rule out .
Same question as in my first post .... was this fault present before the timing chains were replaced ?
Do a vaccum test on engine before you remove the inlet manifold ...... get the diagnostic results before you strip things then if you find faults when it goes back together you can see before and after results .
You say there are no catalytic converters .....has the petrol ecm had a programme change to stop cat converter in efficient codes from showing ?
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