So I had my 2002 xkr laid up for about a year. Surprisingly it started right up. Prior to sitting it ran just fine. I was driving to get an inspection and the check engine light came on. All monitors were set from forever....But now... P0171 P0174 . I also noticed it felt a bit sluggish and wouldnt rev. I cleared the codes, still felt sluggish but now revved...Same codes came back. Filled up with some fresh 93. No restricted performance message.

So I refastened the air intake, checked for leaks with some map gas (figuring the idle would change). I didnt see cracks or breaks anywhere in any of the lines. Same thing.

So ill check back tomorrow to see if I can find any cracks again. I do have a mina air intake I can swap to see if it does anything. Ive also seen a fuel filter can cause this issue as well?>? I also can assume teh MAP gas may not have worked.

Anyway any advice would be appreciated

Damon

 

A better way to look for lean/rich is to monitor STFT & LTFT.
Propane or other flammables should alter the readings but might not cause a noticeable idle difference?

 

I had a similar problem. Turns out mice had gotten into air intake and stored a bunch of food below the air filter! I cleaned out the air filter box, replaced air filter and cleaned the mass air flow sensor.. I cleared the codes and everything is fine. Make sure you use mass air flow sensor or electronic contact cleaner to clean sensor.

Hope it is a simple as that!

Alan

 

If you have VVT, could be an air leak at the two VVT O-ring seals....

 

My 02 XKR was throwing P0171/ P0174 codes a few years ago due to leakage in the Part Load Breather Circuit. I had done a Tygon hack that was sucessful until the Tygon delevoped cavitation. A little over 2 years ago, I did a stronger but still temporary hack that is working to this day. Also note that when it would throw those code, I sometimes would have Restrictive Performance mode kick in, especially when decelerating.
Here is a link to when I did my 2nd hack.
https://www.jaguarforums.com/forum/x...e-part-219539/

 

I have a Porsche cayenne turbo and when doing the valve cover gaskets last year I broke a similar type of vacuum line. Now I tried a fix with some real sticky plumbing tape but the engine heat literally melted it and leaked again...I ordered the wrong replacement pipe then came up with an idea. I deal in forensic architecture/engineering with a specialty in exterior envelopes/waterproofing. Now in many new liquid flashing systems a fiberglass or cotton scrim is saturated in a proprietary resin mix to for a reinforced monolithic flashing. It got me thinking. How can I make an airtight seal that wont leak between the two broken pieces...WEEEEELLLLL...Dont laugh. I had some grey high temp RTV and a dried out pack of baby wipes. I fully cleaned the plastic tube, applied rtv and then neatly wrapped the dried baby wipe over connecting the two pieces.. I then applied more of the rtv to the outside of the baby wipe working it into the material. I let it dry and so far after 20k plus miles. Not an issue. And if it were leaking it throw a code immediately. Wish I took a photo but it looked pretty neat as well. All that being said I did not check that particular line and I was digging around that area after the car was parked. Long story on that. So THANKS! I will be looking there as well

 

No VVT thanks!

 

I am going to check. Its a possibility

 

Everyone here has given me a few things I wasn't thinking of. I should be able to monitor my fuel trims. Here is the freeze frame saved when the code popped up

 

The data shows that at 1400rpm and 23%load, your trims are too high (> 25%). From the looks of it, there is a "new" air leak (high short term trims) at that rpm/load. Normally, static air leaks tend to be most prominent at idle as they become a high %tage. Here, it is at a higher rpm and load, and on both banks.

First, do a visual inspection of the usual suspects (intake tube AND resonators, those supercharger seals that get dislodged, etc.).

Next diagnostic procedure would be to do a smoke test to locate all the static leaks.

Last, to throw parts at the problem, get a new air flow meter (you can try cleaning it first).

 

Thanks,

I was leaning in the same direction including the MAF clean. So possibly a mouse nest or a cracked line. Ill change the fuel filter but it does start right up and idles well. What I dont know is if there is something that would open up and then flag the leak due to a lean issue. The code doesn't come on right away. I drove a few hours before it popped on again

 

Seems like a mouse nest in the air intake system would give you a rich condition as the air flow is being restricted , not a lean condition.

Z

 

quite honesty it’s peculiar. I can drive for an hour and no check engine light. I’d figure if there were an issue in a line it be immediate unless the line is attatched to some sort of a valve that opens only under certain conditions. That being said there does seem to be a loss of power all the time but no restricted performance. Maybe I need to look into fuel pressure. I’m just going to rule out the obvious.

The vent line in the valve cover seems to move around quite a bit where it goes under the sc. Not sure if it generally has that much play or is cracked. Guess a smoke test could tell me that.

 

Run the car at idle (for high vac pressure) and take some kind of spray, solvent or whatever that won't leave stains... Spray around the inlets for the FI's... See if you get a change in idle. I had the same codes, punished myself doing all kinds of tests. Replaced the lower seals on the FI's and the problem went away.

One test was a homemade smoke machine. Old coffee can, used motor oil, a bunch of leaves soaked in oil and a bike pump with some fancy shmancy hoses... Worked a treat. 2 FI seat seals leaking just a liiiiittle little bit. That's enough. Anyways, that's my smoke machine story...

 

Where in NYC ae you....still have that smoke machine?

 

I'm in good ol Staten Island...

The 'machine'?
It materialized out of nowhere,,,
then returned to nowhere...
That's the thing.

 

haha. I have some fine particulate smoke tubes I can try out

 

I know Jaguar’s can smoke, but I’ve never seen one inhale.

Z

 

So my air intake tube looks like brand new. I never like the way it seals at the TB so I removed everything and reinstalled. I was down to one monitor needing to be set to get inspection when the car burped, restricted performance....and both codes came up. I had done a smoke test and found no leaks as well.

I cleared codes and it happened again an hour later.

SOOOOOOOOOOOOOOOOOOOO I ripped the custom air intake and MAF off of my other xkr and installed. Now to drive around like an idiot and see whats next. I had to park the car on the street last night and ended up with an inspection ticket, I mean, how do they always know! Car runs excellent otherwise.

Also prior to this I did and let MAP gas out around SC gaskets....Nothing. Thought I had it fixed

 

Managed to get all monitors set besides components and catalyst...No check engine light. driving for hours..Hopefully get this set tomorrow. Because Ill be at a loss if the light comes back on.