I purchased a 2003 STR with 126k miles. After a 100 mile drive home with no smoke issues i got off the freeway. I noticed alot of smoke coming out of the exhaust only on a few occasions. The problem was hard to repeat. It intermittently happens a few sec after accelerating from a dead stop and accelerating after a sharp turn.

I've decided to do a tune up and pcv valve.



After removing parts I noticed the AF was crushed and not sealing and long over due for a change, deposits on the spark plugs, and 10000 miles since the last oil change when they used 20w-50. Vacuum tube to PCV full of oil.




I decided to do a compression check while the plugs were out. I pulled the ign and Fuel inj fuses from the engine compartment fuse box.





The compression numbers from the driver side bank 180,180,190,170 and right bank 190,185,190,180.

 

Tomorrow I'm going to monitor the bank 1 O2 live data that I'm guessing should mimic bank 2, any one know what parameters these O2's should fluctuate between?

 

Sorry I can't help.

Maybe another member with an STR will help out.

 

I purchased JEGS Performance Products 52205 - JEG'S Air Oil Separator. I will try to modify the old PCV valve in order to keep the original quick disconnect vacuum line.

 

Aha. The upstream O2s will (should) NOT fluctuate. They are the wide-band type (aka linear aka AFR). Older (*), lower-tech cars use the kind that fluctuate.

The downstreams are that type but should not fluctuate other than very rarely as they're cat monitors (and also fine trim adjust).

Do not put in the wrong kind!!! (Probably don't change them, depending on how they're working.)

If you like, blip the throttle and see what the O2s do. Should respond very fast. Generally, they seem to last well but in case a jag tech chimes in - just go with what they say

(*) all the S-Types up to 2002.5MY (2003MY USA) use the older type O2s. Makes it tougher to get fuelling and emissions as exact. From 2002.5MY all moved to the more expensive, better, widebands for the upstream O2s.

 

I have attached the shop manual procedure and results. It looks like your OK. They don't mention any number except the lowest cylinder should be within 75% of the highest cylinder.

They also mention what I was going too about trying the test after a squirt of oil in the cylinder.
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I'm going to try to get the monitors set today. I hear a small exhaust leak on cold starts, I will investigate this tonight.

 

Generally they set fairly easily but bear in mind some may need 2 warm-ups. EVAP may need an overnight cold soak. (Sorry, can't remember.)

 

P1646 is back on on the 2nd drive cycle. This code refers to bank one but not sensor 1 or 2. Alldata is not much help.

 

Grab the codes PDF from the FAQs and it tells you more

Another option is Search using the code.

 

Any idea who makes the upstream HO2S for jaguar? I'm looking for the best aftermarket alternative to the dealer item?

Maybe:
Bosch?
Denso?
Delphi?

 

car quest told me the factory oxygen sensor is made by bosch, will be installing it tomorrow

 

The bosch part was a denso in disguise.

 

After installing the bank 1 upstream O2 sensor the P1646 code has not came back on, I have not noticed any smoke out of the exhaust yet after a few short drives. I have been getting some detonation under load with more then 1/4 throttle, I'm not sure if this was pre existing or not. The detonation has diminished by about 70% after octane boost and some extra gas. I'm hoping after all the monitors are complete that maybe the detonation will be gone? Any other suggestions would be appreciated.

 

If you check it's working, it may then be worth disconnecting the battery for 5 mins to clear the KAM (keep alive memory). That will clear out learned values - on the basis it may have some bad ones due to a bad sensor (if it was bad).

Read JTIS / codes PDF first 10 or so pages about "drive cycle" if you want to help it relearn.

 

I tried downloading JTIS21 if that's what your referring to but I'm having issues, i wish it was easier accessed with out being downloaded.


When monitors are erased wont that cause the computer to have to relearn?

 

You don't have to use JTIS you can use TOPIX and then you don't have to download it.

But you have to pay - quite cheap - so it's your choice.

Please yourself whether you clear KAM. If the O2 was faulty, I would.

 

did u install the air oil separator? how does it work?

 

did u install the air oil separator?

 

not yet, its on my to do list in the next few days, I'll post some photos. The jegs oil sep is very small, but I do like the see through feature, I would recommend getting one that has a larger reservoir.