Eventually as to how fast is anyones guess. I would say that they will not die overnight, but I am assuming.

If you have not touched the airbox prior to throwing the codes, again I would purchase a can of MAF cleaner and start there.

I hear you on the other vehicle.

Your welcome for the write ups. I hope they help. As you see i have been around our S Type once or twice....literally.

 

Oh man I completely forgot about that!

 

Running lean means running hot. Too hot=damaged parts, whether it be your valves or cats or what-have-you. With the codes you have combined with the absence of obvious running problems, it is highly unlikely that it will lead to anything catastrophic in a short time frame. I would say its best to address it sooner than later, but a few days/couple weeks likely isn't going to hurt anything long-term.

 

Usually you can see the values in real time, in which case you're seeing the values at the current rpm. So just look when the car is idling (warmed up) and then rev to about 2500 and look again as you hold the revs.

It doesn't have to be exactly 2500. The point is to have lots more air flow so that any leak is likely then to be a smallish part and you can compare with the idle figure when a leak will make a relatively large impact. If you don't see quite different trims you almost for sure don't have an air leak, or at least not a typical one.

The fancy tool can track trims at various rpms but you can do it by hand.

If you appear to have an air leak, some cautious spraying of propane at idle will make the trims move almost instantly (and you may hear the engine note change).

 

Yes it adds fuel. There's a good "quiz" about lean codes in General Tech. If you're lucky a leak is smallish and the extra fuel just compensates, so the cats are fine. Er... if you're lucky.

The codes flag when the extra fuel it's having to add is rather a lot (over 25%)!

Really it's a good idea to have a look at trims every now and then as even 10% is a real worry.

BTW, misfires often trigger lean codes (think and you should see why).

 

Darren any update?

What did you find?

 

UPDATE

Ok after spending most of the weekend looking for vac leaks and not finding any I broke down and bought a new MAF and Bam! its fixed!!! no more codes. I guess I got lucky I tried to clean it with no luck so I just gave it a shot and bought a new one.

Dean

 

RICK

LTFT was good wish I would have checked it first! that was really good advice. What a friggin hassle this has been I hate chasing down vac leaks!!!!!!!!!!!!!!! now off to get the truck done need it tomorrow.
Thanks to everyone that chimed in!

Dean

 

congrats.