Have any of you had an issue with rough/misfire startin when cold? Before I call my server manager (who has been amazing) and drop it back off. It has never done this before I just had major engine work done under warranty, and drove it to keywest from MA with zero issues, other then the AC not blowing cold, dropped it off they took care of it, now the last 2 cold starts after sitting, it will fire right up and idle rough then stall. I can keep it running with alittle peddle and eventually it will gather itself and run fine. Any ideas before i drop it back off again (3hrs of driving)?

15 V8S

 

Bad gas?

 

Could be...or maybe the obdii issue, they updated my software.. But starter doesn't sound slow.

 

Water in the gas? Might try some dry gas additive.

 

Update: I filled it up with new fuel, it started fine. I pulled out and the dash freaked out (also a first). So my first thought was loose terminal on the battery, it was very loose. So I tighten it and it fired right up and has ran good so far. 🤞

 

That'll do it!

 

Update: better but still something isn't right, i will look at the live data this week and see if i can determine anything.

 

CEL finally showed up:
P2180 - System Too Rich Off Idle Bank 2
P2178 - System Too Rich Off Idle Bank 1
P2190 - System Too Rich at Idle Bank 2
p2188 - System Too Rich Off Idle Bank 1

once warm, runs mint. Reset codes 2x come back after a few starts. 3 tanks of fuel, bottle of dry gas in the 2nd tank.

Any ideas?

 

Search this for the codes - it describes the various faults that could cause them...
https://www.dropbox.com/s/1ek33ux7tf...guide.pdf?dl=0

 

 

Thanks for this!!

 

Thinking its MAF or injector related, being that its on both sides i would lean towards MAF, but i dunno. im just going to drop it off at this point. thanks for the insights.

 

If it's on both sides then it's unlikely to be the MAF sensors, as there are two of them one on each intake tract and they would both have to fail in the exact same way at the exact same time.

 

 

There are definitely two MAF sensors, one in each intake tube, see this post: https://www.jaguarforums.com/forum/f...8/#post1878841
Down at the bottom of parts 5 and 6, in the "resonator" tubes and just above the air boxes. I am 99% sure there is no other MAF sensor anywhere, maybe you are thinking of the MAP sensor?
Also, that pic confirms there are three L shaped resonators on the upper part of the intake tract, one each on parts 7, 8 and 9.

 

 

I would be looking at the intake tube right at the end, the Y piece that fits around the throttle body opening. It may be cracked or split underneath letting unmetered air in, this has happened to a few high-mileage XFR and XF SCs.

 

​​​​​​....🤔 will take a look!

 

Wouldn't that produce a lean condition, not rich?