Car has a high pitched screech similar to a slipping drive belt when accelerating but I think it maybe injector related. I have put my electronic stethoscope on each injector and two of them (injectors 3 and 5) are significantly louder and and higher pitched metallic sounding. I have sprayed them with soapy stuff and get no bubbles so probably not leaking. What could cause this noise? Should I just replace the injectors and hope it solves the issue? 2008 RRS 2.7 TDV6 S Poverty model

Maybe the mechanical fuel pump at rear of engine ?

Check the normal belt tensioner at front isn’t loose for an easy fix

Belt looks good. Front timing belt was replaced in march along with oil pump due to a gasket leak. The rear belt has not been changed as the engine has only done 35000 since recon. I did notice a very slight wobble on the crankshaft drive pulley looks around a mill misalignment. Those two injectors really don't sound anything like the other four. 2008 RRS 2.7 TDV6 S Poverty model