Hi, my 2002/3 STR has developed some faults and is smoking on start up. Please see the picture. It also jumps in to limp mode and shows a gearbox fault when using kickdown at 50 ish mph.

Grey smoke STR
The fault cofes are
C1280 yaw rate sensor, signal failure.

U2522 CAN message timeout from transmission control module.

P0171 System too lean Bank 1

P0174 System too lean bank 2

P0430 Catalyst system efficiency below threshold (bank 2)

P1582 Flight recorder data is stored

P1643 CAN link engine control module/transmission control module circuit/network

 

Ignore most for now. Does P1643 keep occurring?

You need to follow the many forum posts about P0171/P0174.

Hope that when fixed the P0430 goes away but unfixed lean codes can mean cat damage & thus P0430

 

Hi, Its the 1st time the codes have been read following the gearbox fault .The gearbox fault is recurring, the car goes into limp mode every time I accelerate hard. It does go away if the car is left a while. I've also replaced both sensors and the codes for the cat went away, but returned...

 

Which sensors do you mean that you've replaced?

 

Hi again, the lamba sensor on the bank the cat was down on, I had one done earlier this Yr and the other bank done last yr so they both were done.

 

Those are lean codes so what do the fuel trims show (also the freeze frame data if your tool can decode it) - see previous posts about those codes.

 

Hi, my mechanic just called with some info. The car is creating insane suction when running. The breather pipe when removed stops the engine and the oil filler cap is sucking on when running. Please see the video.

https://youtube.com/shorts/3jFJwphdp5Q?si=FqQM0uuth7lwnX04

 

Er... you don't say!

An engine is effectively a vacuum pump. That's why the term "throttle" is true.

Find a MUCH better tech/mech.

 

Hi, he's a great guy and was surprised at the power of suction. Works primarily on Subaru and is a sought after mech and decorated racer, he helps me when he can. I'm going to ask about what you asked for on your second to last post and see what he says. Thanks again.

 

Hi Flappers,

As JagV8 has already hinted at, lean codes are not usually triggered by failed oxygen/lambda sensors, and it is rare for the O2S's in both banks to fail simultaneously. Lean codes are more commonly due to air entering the engine past the point where the Mass Air Flow Sensor can measure it. The oxygen sensors report this excess unmetered air to the Engine Control Module, which attempts to compensate by increasing fueling. When the ECM's adjustment exceeds 25%, lean codes are triggered.

Your supercharged engine has many potential leak points for unmetered air, including cracks in the air intake pipe accordion folds, the seams where the Helmholtz resonators are ultrasonically welded to the main intake pipe, the O-rings in the breather hose Norma connectors, the crankcase vent valve ("PCV valve") O-rings, the oil filler neck and cap O-rings, the intake manifold gaskets, etc. Smoke testing from several injection points will usually reveal the leaks, but a quick check is to look for any spot with oil seepage. If oil can get out, unmetered air can get in under engine vacuum.

Regarding the U2522 and P1643 codes, the first thing I would do is check for oil contamination of the transmission electrical connector. The O-rings on the connector sleeve harden over time and allow transmission fluid to seep into the connector and foul the electrical pins, causing all sorts of communication issues and transmission misbehaviors.

Cheers,

Don

 

Thanks Don and thanks JagV8, for helping. Really informative, I genuinely appreciate your time 👍

 

I would verify all plugs and coils are good. Tell mechanic to look at the obd2 misfire monitor counter. If any are suspect or have no recent history i would replace plugs and coils

 

How many miles on your Jag? The video certainly suggests a good bit of "blow by" gasses in the crankcase...

 

It's had a refurbished engine in it when I bought it. I only realised when I got home and read the history. So im thinking probably 70k on the new unit.

 

It may be the color balance on my laptop screen, but the smoke in the picture above appears to have a blueish cast to it, which is typically indicative of oil burning. Blue smoke at start-up is often caused by worn valve guides and/or valve guide seals.

Did your mechanic friend take a look at the spark plugs to see if there is evidence of this?

Do you have the paperwork on the "refurbishment" of the engine? Corners may have been cut on the work performed...

 

I don't have any paperwork im afraid . I called the shop that carried out the work from the invoice in the history only to find out they upgraded their systems shortly after the work and have no info on the refurb unit or milage on the old unit. I'll pass this on and thank you It does have more grey/white than blue i think, but you may ne right 👍😕 Spent a pretty penny rebuilding the arches on the back, new sills ... the list goes on! I love the car though!

 

Hi Don, a large vacuum leak has been found. The pipe ordered and fitted and that's cleared the lean sensor codes it seems. The p1643 for the gearbox can communication error is still there though, hes looked at the gearbox plug there wasn’t much oil but cleaned it off anyway and it’s not made any difference. Can you offer any more help please?

 

That's great news about the vacuum leak. Glad you found it!

I can't remember if we've posted the definition and published possible causes of P1643, so here you go:





For the procedure to test the CAN, see Pinpoint Test E beginning on pdf page 2852 of the Workshop Manual, which you can download at the link below. The pinpoint test says it is for P1637, but apparently P1643 is caused by similar issues, so the diagnostic procedure is the same:

Jaguar S-Type Workshop Manual 2002.5

You can download the DTC Summaries at this link:

Jaguar S-Type DTC Summaries 2002.5

Cheers,

Don

 

Hi again, the car has been with the mechanic for several weeks and he's been trying to isolate the issue with communication with the gearbox. I've said I was going to write here in the hope you guys could help. This is a copy and paste of where we are up to!

"Fault code p1643 Jaguar s type r
The car will start and run fine until revved in park where it will then bring up transmission fault and restricted performance

Disconnected wiring loom from ecm to tcm and visually inspected connectors on both sides, no oil or obvious corrosion found

Wiring loom was then tested for continuity on all pins (all tests fine)
Resistance on all wires are as you’d expect 60 ohms on the power wire to tcm with no shorts to positive or earth on any pins

Car has also been smoke tested for any air leaks, no leaks found and no other faults found in ecm"

Can anyone suggest anything? I know they have looked for breaks in the wires with a tool and it's found nothing.

 

see if you have aftermarket ignition coils. feedback goes through the wiring harness and shuts down the tcm

if you still have a no comm go check for power and ground at tcm connector. if good replace tcm