Seems like the typical lean banks, and possible non functioning O2.
I checked the hose under valve cover already, along with the two large O-Rings
on the manifold. Both are OK with no cracks or breaks anywhere.
Whats next guys?

 

Here here. Also would be helpful to provide the year of your vehicle and miles at this time.

 

Sound advice there Supralative.........get back with the relevant info and I'm sure that FJT or another member with sound knowledge will be able to assist or at least point you in the right direction.

Jim

 

hehehe
and the winners are
P1316
P0171
P0174
P0306
P1111
2002 3.0 with 88K
issue is at mild/medium throttle levels, it seems like it hits fuel cut right at 3K RPM
if you just drive it nice and smooth its ok
or if its floored all the time its ok
had these codes before when i posted but just didnt post them..sorry hehe

 

when it gets to 3K does it just feel sorta like your hitting a rev limmiter and bucks?

 

You said u checked breather and IMT seals? How?
The lean codes are gonna be those things and also the little plastic booster hose. Goes from brake booster to intake manifold and has a check valve in it. If it is grey (the checkcalve) it is the old style.
Also the IMT seals, if you took them out to look at them, I hope you put new ones in. If they are yellow, they are old style. Green are new. If the breather hose is smooth, it is old. If it is shiney and ribbed looking, it is new.
These parts are all cheap. If they are the old style, change them.

 

Thats what I had, and thats what the dealer said they replaced (breather hose, IMT seals). It has been months, and all is still well.

The symptoms sound the same as the ones I had. Take heed, Supralative!

 

i checked the two black round cylinders toward the top passenger side of the manifold
i havent checked the booster hose yet nor the intake manifold seals itself
i do have a set of those though, when i change the plugs out
all the other parts are the old style but no cracks yet
my cruise still works and everything else
in the summer the car is fine no nothing
as soon as cold weather sets in the light comes back
its like it a winter guest hehehe

 

Well if you are taking your intake off to do the plugs anyway, do your self a favor and get the two IMT seals and put them in. Also the breather hose and the brake booster to intake hose. Easy to do and cheap insurance to keep your car running well.
Oh...and before you go snapping the tube, to get the plastic lines out of the intake manifold, ie booster line, you press with a small screwdriver the outer black ring, as you push down on it, push the tube slightly and pull it back out. Many don't know how to get them out and end up snapping it inside the manifold. Then it can get ugly.

 

ok
when you guys say IMT
are you referring to the two items i was talking about?
if not what are you guys referring to

thanks again
great site with good help now

 

The two big valves on passenger side of intake manifold. You didnt answer, you said you checked them. How did you do that?
Also the hose from the booster. The grey valve in the middle, with car running wrap your hand around and see if noise changes.

 

i undid the two 8mm bolts on each of them and pulled the valve out
o-rings where not cracked or cut anywhere
old looking yes, but all in tact
i havent checked the car yet due to work schedule and the wife has
the car when i am at home

 

If they were yellow o-rings in there, I would replace them anyway. They leak even though they look fine. The new ones are green and much thicker.

 

Will do.
Does anyone here have a hook up on factory Jag parts?
I am checking with a friend from the Supra days, but havent heard anything from him yet.

I can hear a hissing when the car idles though from that location with the two valves.

 

That is probably the source of your rough running if they are hissing.
Those seals are probably 3 bucks each from the dealer. Just be careful putting on the lower one that you dont cut or tear the seal.
Slow and steady beats fast and furious eveytime.