Hi all

I have been asked to look at this vehicle which keeps flagging a P0100 code.
The vehicle looks to have had both egr valves and both turbos replaced very recently.
The supply and earth at both MAFs are correct but they are digital type so i have no output figures, however.... the snapon verus does give a g/s output data figure which it must calculate itself from the frequency, and they show bank b about 30% lower than bank a.
But as the g/s figures given are much lower than I would expect from a normal MAF, being 12 on bank A and 8 on Bank B, has anyone using a snapon scanner ever noticed what they read on this engine in any of its fitments.
Thanks
Andy

Hi
Not very familiar with Jags but think some have a balance / cross over valve in the inlet system to balance the two banks, known to fail.

Aidan

Aiden is correct check the balance valve up front centre of engine flap seizes and can usually be freed off

Good advice - if no fault there - Smoke it!

The inlet manifolds are known to split.

Si

Andy - this cant be an XJS as they stopped making those in the mid 90's !
Do you mean an XF 2.7 diesel?

Colin.

Sorry it’s an xj6.
Had Friday as a snow day so haven’t smoked it myself but garage who gave it to me did.
Now weather has improved I will be able to road test it properly and graph some data under load.

Hi Andy

This maybe on earlier models but if its got vacuum operated manifold flaps. Worth checking for split diaphragms.

Regards Ian