I have been tracking idle issues for years improving gradually including removing aluminium oxide ( white powder ) discovered on the intake manifold earth bolt thread.
Cleaning the bolt thread made an improvement but after a short time even with the bolt sealed very tight the poor idle and white powder returned. ( I should add I live near moist salt air so it happens faster for me ) and maybe i should have cleaned the thread inside the manifold as well but it doesnt matter as I put a separate earth wire from the battery negative to the earth bolt on the manifold and the car has never performed better.
So just because all the wires look good it doesnt mean you are getting the best performance you could as this earth directly effects your injectors performance.
Before when the car started it was on the turbo timer ie running on battery only the engine revs dropped very noticably when all four blinkers flashed, now you can't hear the engine revs drop at all.
So if your if your engine revs on idle are sensitive to current draw think about a new earth and enjoy
a very responsive car when you put your foot down.
Cleaning the bolt thread made an improvement but after a short time even with the bolt sealed very tight the poor idle and white powder returned. ( I should add I live near moist salt air so it happens faster for me ) and maybe i should have cleaned the thread inside the manifold as well but it doesnt matter as I put a separate earth wire from the battery negative to the earth bolt on the manifold and the car has never performed better.
So just because all the wires look good it doesnt mean you are getting the best performance you could as this earth directly effects your injectors performance.
Before when the car started it was on the turbo timer ie running on battery only the engine revs dropped very noticably when all four blinkers flashed, now you can't hear the engine revs drop at all.
So if your if your engine revs on idle are sensitive to current draw think about a new earth and enjoy
a very responsive car when you put your foot down.
Last edited: