Hello to all,
2009 jaguar xf supercharged
I've read other threads on this forum about these codes but it seems like most people get either lean codes or rich codes. I actually have both along with p0300,P0316 and all the misfire codes.
On another thread I read about the hose on the induction elbow which needed to be fixed, this was done back in April of 2016. I've taken it to 2 dealers here in the Washington DC area and they seemed as stumped also.
I'm checking on this forum to see if anyone else has experienced this issue. Also the car runs great although on cold start there is a hesitation on idle.

 

Actually our cars start throwing codes of all sorts when the battery is on its way out, so get it checked before you spend money on anything else.

 

Thanks, I had that checked
The battery is strong.

 

A good read
P0171 and P0174 - OBD-II Trouble Codes Fuel System Too Lean

 

The freeze frame data may help you.

Also, you could see which code flags first, with its freeze frame data, to try to figure what's happening.

P0316 is unusual I think and I guess points to something quite serious.

I'd be looking in each plug well and checking each coil.

What mileage? (In case plugs are due.)

 

JagV8, So I go out to look at the freeze frame data. 2 more codes pop up P0101 and P010B and I can here a very loud whistling from the engine. I think I still have a vaccum leak issue. I think this is the next step. Just for kicks though some of the freeze frame data.
At idle
Fuel pressure PSI: 47
st ftrm1: 13.3
st ftrm2: 14.1
lt ftrm1: -7.0
lt ftrm2: -6.3

 

Trims could be swinging around if the leak is intermittent.

 

I found a vacuum hose unplugged and I changed my gas cap, it was throwing a code as well. Then I cleared all codes and now I'll drive it this week and see what happens.

 

Good plan. Then check the trims.

 

So after almost a week of driving, no codes have returns and my fuel trims are:
at idle
STFT 1 and 2 fluxuates between 5 and -5
LTFT 1 and 2 is at 15

I think I'm good. All this trouble over a disconnected hose.

 

LTFT at idle should be near zero.

Hot engine, check LTFTs at idle then rev to 2500 or so, let trims settle, read LTFTs again.

If they drop nearer zero you have an unfound air leak.