Hi looking for some advice, my 2001 xjr has a problem with the idle. It runs fine over 1000rpm and when I obd it it comes up with missfires on all cylinders. It is not the tensioners and I have looked for vacuum leaks and can't find any, I have changed the spark plug and the air flow sensor but no better.
Any suggestons.

 

Have you cleaned the throttle body? Just around where the butterfly valve mates to the bore is all that matters. A little curd there can do strange things.

You say you have misfires all cylinders? No other codes? Done a fuel pressure test?

 

Bad gasoline???? Clogged fuel injectors??????

bob gauff

 

Hi I think I have sorted it found a missing o ring on the engine breather pipe. Thanks for your help but I may be back if its not fixed and I'll give you all the code next time I check them.
PS. I cant start the car at the moment as I am modding the supercharger nose to fit a new pulley but I should get it going on monday.
Cheers Guys .