So there was that plenty puddle (1ft)… the engine stalled and I pushed it to the dry land … in the morning reinstalled the wetted spark plugs , started the engine , used Techron Chevon fuel treatment concentrate , got a new Carquest air filter , cleaned the MAF Sensor , flushed the oil with some moister removing Gumoff substance , changed the oil (5qts mobil1 0w40 and 2 qts Lucas Synthetic oil stabilizer) , also used a bottle of HEET ( for fuel) … and it’s still shaking and stalling occasionally , with the LTFT reaching +40s and OBDII indicating that the fuel is too lean in both banks
🤔🦧

 

For reasons unknown, I had been wondering if you'd made any progress recently, but was afraid to ask. My spidey senses were right...

FWIW, I have a 1948 Jeep. It is amazing off-road, but is a menace on the highway. Top speed is 60MPH, but only with a strong tailwind, and even then it is very squirrely. So to summarize, it is phenomenal off road, but I avoid taking it on the highway. I also have an '02 S-Type. It will cruise effortlessly at 80MPH on the highway, but performs VERY poorly off-road. For these reasons, the only off-road it might ever see is a gravel parking lot at worst.

I have NO idea why you were taking your poor S-Type through such a deep puddle. Goodness, be nice to your poor car. Was the air filter intact? Or did it collapse and let water through? If the engine stalled before water could be ingested, you got lucky. If water made it into the cylinders, you may have serious problems. You'd need to do a compression test to see if you've got cracked pistons or bent connecting rods.

If no water made it into the cylinders, hopefully any issues are external, such as water shorting out the ignition coils. Are you getting any misfire codes in addition to the rough running?

 

+1 on performing a compression test on all cylinders.

 

Karl, the OP lives "In the woods" per his profile.

My former neighbor did a similar thing with his late model Caddy and got water in places that water was never intended to go, like inside of the wiring harness, etc.; his car ended up being totaled by his insurance company as even after weeks of drying out, it never ran properly again. Hopefully the OP will be a bit luckier...

 

The only codes showing (and those retarded cams and cats codes vanished)

And I did (unknowingly try to start the engine after it initially stalled in the puddle) , and after a few attempts and a few hours it turned and was making whining sound trying to start … so I cleaned the spark plugs and it worked , thou this shaking on idle …
Anyway I’m waiting to refuel the tank with fresh gas tomorrow and go from there
Brothers , thanks for the invaluable advice 🤙

 

Still haven't answered the question:

Did water breach the air filter?

 

Yes , the air filter was wet and there was a little water in the the throttle body …

 

Filled up the gas tank with some fresh 93 fuel and the Techron Chevron Concentrate , still shaking …
So I’m about to check the compression

 

Fingers crossed you're only seeing vapor that condensed. I'd think the air filter would have had to collapse to let any serious amount of water into the intake.

Hopefully the rough running is due to water collected externally, such as if shorting out a coil. Still not a bad idea to do a compression test in case more water got in than it would seem.

 

The O2 sensors have a port for fresh air that hou could have swamped out and plugged. That would cause the stumbling and the codes.

 

So the compression on bank 2 has showed that cylinder 4 gets 100 reading while cylinder 5 gets 150 and cylinder 6 gets 160 … so I poured some oil into cylinder 4 and the reading went up , therefore I’ve added a quart of ‘Rislone ring seal’ to the oil


And the only codes showing is the ‘fuel too lean’ (the other ones have vanished)
And the O2 sensors along with the dirty cats are not blinking despite of having been submerged under water a few days ago 🤔

 

Brothers , any good suggestions on this ?

 

📶

 

Wish I knew what to suggest. I don't have any ideas. I don't think anybody else does, either.

With your other thread, you made a lot of progress. You resolved a whole slew of faults and things were looking much better. Then we get hit with some cryptic tale of a giant puddle and a drowned car. I still don't understand if you knowingly drove the car into said puddle. Or maybe the car was parked, minding its own business, and that crafty puddle snuck up to it, as they are want to do. Maybe I don't want to know the details...

The results of the compression test are not promising. Sounds like you've only tested the side with easy access, and one of those cylinders was low. You may have to breakdown and pull the intake plenum to test the remaining three cylinders. Don't expect any magical oil treatment to restore compression if you've got a cracked piston or similar.

 

Look up P1573 & P1586 in the Jaguar doc and then troubleshoot.

Water can be very bad news, sadly.

 

 

So it’s been over a month I’ve been driving with the jag shaking and stalling … and then when the scanner was saying that all the cylinders were misfiring , I got into the engine just to find that hose hanging loose !
All the cylinders are firing 180sh with the exception of cylinder 4 , that’s only 120 🤔
other than that the perfect trim is back to normal and the car is driving like a Kitty Hawk 🐓



🦁