I know what the misfire part means. On all the previous error codes I have been getting P0420 with "FUELSYS1 CL". I have found "OL" means open looped and "CL" means closed looped.

What does this "OL-Drive" mean?

The rest of the freeze frame data is as follows:


Freeze Frame Data

DTCFRZF P0305
Fuelsys 1 OL-Drive
Fuelsys 2 N/A ?
Load_PCT (%) 98.4
ETC (oF) 216
SHRTFT1 (%) 15.6
LONGFT1 (%) -3.1
SHRTFT 2 (%) 15.6
LONGFT2 (%) -3.1
FRP (PSI) 39.6
RPM (/min) 3197
VSS (mph) 65


Can you help me with specifics on this read and what the "OL-Drive" means in terms of functional components please?

Thanks again.

 

OL-Drive often means the PCM is messing with something and has temporarily suspended closed loop. E.g. WOT (wide open throttle). E.g. EVAP purge. Basically some event that means it's decided to use fuel maps and the like instead of the O2 sensors.

You'd expect it to be a very short-term thing. Otherwise, you'd hope to see OL-Fault which means it knows it cannot use the O2 sensor(s). (OL-Drive means it's chosen not to use the O2 sensor as opposed to being forced not to use it.)

The Load is about at max so is probably a reflection of something like WOT.

 

Minor stuff: ETC is usually called ECT.

I expected you'd have Fuelsys2. The STR does. I know the 3.0 is a V6 (and does indeed have cyl5 nearest the passenger in the USA), and I thought it had 2 cats, each with a pre- and post- O2 sensor (of different types).

Is Fuelsys2 always N/A? I don't think it should be!

I've had a V6 of similar configuration (to the S 3.0), which would apparently, if one bank was bad, use the good bank's closed loop to contol fuelling on both banks. I'm pretty sure it would not have shown N/A as the bad bank's status. Could be a software issue, however.

Could you at all easily get an exhaust back pressure test done? Might tell you whether one bank is partially blocked.

Anyone else got an OBD scanner and a 3.0?

 

grrr, contol fuelling = control fuelling

 

Have you checked for the rotten PCV elbow? This is well known problem with the V-6. It requires the intake to be removed which is not a small job. It creates a vacuum leak and usually sets a lean code of some kind.

Also check for oil in your coils. Have the coils and/or spark plugs been changed??
Again how many miles on the car?
.
.
.

 

He's going to check for oil/water in the coils etc. And is planning to change the plugs, as I recall.

Good point about the PCV, particularly. It's been in multiple threads here, though, so I expect he's already aware of it.

He posted the mileage... might've been 60K or 72K? But I'm kinda forgetful.

 

'02 3.0L S-type. 92.5K miles. Started with P0420 codes about 2k miles ago.

P0305 just popped up yesterday.

Plugs, coils, gaskets all will be replaced this weekend. I will get a new PCV and replace it while I am in there too. Thanks for that suggestion.

I'll check all the hoses while I am n there.

Anything else cheap I should change out at +90K miles on this new2me S-type while I have the upper intake off?

Thanks.

 

Thinking more, I'm doubtful it could be PCV or the like - which would be an air leak. The LONGFTs (fuel trims) are -ve whereas they'd be +ve. (And not enough -ve to be worrisome. They're only modestly -ve.)

Still, a good idea to renew cheaply a component that's a known common failure.

Sorry I got the mileage wrong.

 

It's a rubber elbow in the PCV system. It's not the PCV itself. So just inspect them. There are several and by now I would have expected this to have failed and been replaced already?
.
.
.

 

I'll be checking those elbows and vaccum lines as I remove them. Hopefully AZ can match something up if needed.

Thanks.

 

Bought an AllDataDIY subscription from Autozone... Not certain how valuable it really is yet.

But it shows the cylinder order as such...



Is that the correct order? If so, the misfire was not even on the bank that is sending the P0420 code...

I am elbow deep in coil and plug swapping... Hopefully it will fix all my poor kitten's ailments!

 

If you can find a j t i s directory (folder) something like data\dtcen and files like p0003.pdf you'll see the cyl. numbering is different:

(front)
2 1
4 3
6 5

Which would fit with your previous idea of the problem area. Scarily, AllDataDIY appears to be wrong

 

JagV8,

You are right! It is right there in the Jag JTIS file 400EOBD2.pdf (unless they screwed up?).

The correct firing order according to that file is as follows:



Thanks!

 

You're welcome

I suppose Jag could've got it wrong but it doesn't seem likely. (Once upon a time, plug leads had numbers - which sure helped!)

 

We might be talking Apples and Oranges. If one looks more closely, the AllData picture is labeled with "cylinder #" and also the "firing order" is listed at the top.

The JTIS lists the "firing order". Both agree on "firing order". But AllData calls the cylinder numbers differently.

Is "Bank 1" always all the odd cylinder numbers? (Where is the scratching my head emoticon?)

 

I don't know whether the cyl #s are like that, sorry.

I think OBD mandates that bank 1 must be the right-hand one, sitting in the car looking forward. It does mandate that bank 1 must contain cyl 1. Whether it also numbers the cyls the way you said, I don't know (but I'd like to).