[brucelee]

Originally Posted by JockeHyundai

Crank shaft position sensor?

I dont expect that to be the issue. If that was the problem I would expect a code relating to it.

[brucelee]

I noticed a pattern. It starts perfectly fine on cold mornings. The fuel trims are way negative, indicating a rich condition which the computer is compensating for. -15% and -19% on each bank.


Will be changing fuel pressure regulator this weekend.

[brucelee]

Fuel pressure regulator was the problem. Starts smooth and idles fine now.

Better fuel economy and smoother engine.

[JimC]

I have the same trouble with my 2004 XG350....65k miles.....any luck with your troubles yet?

[JimC]

Ooops, sorry, missed your final threads....cool will try the fuel regulator. Thanks !

[hanky]

If the fuel press regulator doesn't correct the problem, consider the crank sensor.
Here is why;
A malfunctioning crank sensor "Does not throw a code" !
If everything else checks out , smart move to change it.