we have a 1986 v12 been stood for many tears we have it running now will rev up but when you try to drive it there's just no power,and the exhaust on the left is a lot hotter than the right hand side any ideas

 

Blocked or not properly opening injectors. But what have you done, if anything, to renew the ignition and HT system and clean pout the fuel system and clean the injectors?

 

fuel system cleaned out injectors removered and cleaned injector cleaner put in the new fuel new plugs,distributor remover and checked all ok leads all ok,starts up first turn of the key with no pedel used ticks over fine just lazy until it gets to 3000 rpm then its revs up fine,but put it in gear its just flat

 

Try a flash-stall test on the gearbox. In drive, foot on brake HARD, blast throttle for a second and see what the rev counter does. If it does NOT flash to 2600rpm or so, then gearbox is the problem. I just learned about this the hard way on a mate's car!

 

Sounds like you're running out of spark. Have you tested the second coil?

The A bank temperature difference is probably not related. I'd confirm all your injectors are actually activating. You can pull the whole rail up and support it connect onae at a time. Twist the throttles open quickly and confirm the connected injector fires. Slide a clear hose over the nozzle into a catch can.

Fire potential is high so extinguisher and a helper would be wise.

 

problem found not sure what its call but it was the small silver box situated on the front o/s of the engine compartment changed that runs great now
thanks for your replys

 

If that was the longish thingy with a multiplug in the end, it is the resistor pack, and if the plug is dirty or corroded, it can stop the injectors opening. Good find.
Greg

 

Does it have Marelli ignition, or Lucas? Because this sounds like classic "Marelli meltdown" failure, where one bank of ignition fails.

 

1986 should be Lucas.