Hi all,

I'm new on this forum, and also with the Jaguar STR.
Car is produced in 2003, has a milage of 130.000km.

Engine sound beautiful and drives great.
Now the problem, when I fire up the car, sometimes the next day, sometimes after a few hours, there is a huge cloud of smoke.
The smoke smells like burned oil.
The weird part is, that it doesn't happen all the time.

Also when driving the car, there is no visible smoke at all.

The jaguar specialist checked the car and didn't found anything strange.
Replaced oil and filtersReplaced PCV valveAdded oil fortfire and leak lock
Is there anyone on this forum with ideas or experience with this issue?

Let me know and thanks👍

 

I hope leak lock is not what I fear as it can be a nightmare!!

Exactly what product added where?

 

don't know exactly what product.
https://www.forte-benelux.com/
Leak lock from supplier above is what he said.
By the way, the above described problems where already existing before this addition

 

I've been a car nut for going on 40yrs and **generally** speaking to your stated observations there are two possibilities. (this is general info and not S-type specific)
A puff of smoke at startup and having NO other problems or symptoms... is usually valve seals, or something preventing the oil from draining back down, or PCV related.
One way to tell is if the car is driven less than 1/2 a mile, parked and the next start is 1 day+ and you DO get a puff of smoke. (oil is cold and pools in the top end and drips past the valve seals a bit)
But when the car is fully warmed up, driven 5+ miles, sits 1 day+, and DOESN'T smoke at startup. (the oil is less viscous and quickly drains down after shut off)

Keep in mind with my above statement... there must NOT be any other symptoms. No oil consumption, no coolant consumption, and no mixing of the two.

This phenomena is quite normal for cars that are specialty cars like exotics, corvettes, and convertibles which are generally not driven much, sometimes started and just moved in the garage or driveway and not allowed to warm up.

If it's indeed only oil getting past valve seals... don't worry at all. It won't affect longevity or performance.

If an engine IS giving a puff of smoke at nearly every startup... either the valve guides are highly worn (overly wearing the seals) or there is a PCV problem... or something worse like a head gasket leak.

For what its worth my 03 4.2L DOES give a small puff of smoke if I start the engine move the car 25ft, turn off, start the car, move it back into the garage, and then restart within a few days. But when allowed to warm up and even taken on road trips.. nothing at all at startup. (its a garage queen)

 

Thanks for your huge reply!
The valve seals where the first thing where I was thinking about.
But it's not exactly like you described above.

When starting the car after it is cooled down, sometimes there is a huge cloud of smoke.
I think it's more worse after a short drive, but also after a drive of 60km, cooling down and starting, it CAN happen.
Not all the time, that's strange to me.
Also the oil consumption is high, but no smoke at all while driving. Even not when accelerating firmly, or engine braking from 120km/h back to 50 and accelerating again.
Tried this by driving another car behind the jaguar.

Replacing the PCV valve did not make any sense.

Is there a way of testing the valve seals?

Or does anyone of you all have any other possible solutions?

 

It sounds to me like its something more than simple valve seals.

I suggest next doing a compression test and a leak down test on every cylinder.

 

mine used to smoke on start up un-till i fitted a pcv oil catch can . it used to pool oil in the supercharger , then the blower rotors would throw the oil up in to the charge coolers/ports on start up .
have a look under the blower hat (remove 4 bolts ) and see if it's wet with oil .

 

Looks like the issue is solved.
remounted the original suction side tube to the supercharger. Previous owner mounted an aftermarket stainless steel one. After fitting the original tube on to the car, all issues were gone (extremely oil consumption and smoking on start up)
Thanks you all for thinking with me!
Cheers