My friend that has a 2000 XKR is getting the 0171 and 0174 (+25 mark on both banks) on his system. He has been going through a series of getting the pending, then the CEL and RP, then clearing the codes and starting over, thinking at some point he will get enough "ready" readings to get a State Inspection. I think that will not work.

However, I would be concerned that with the amount of fuel that may be added to compensate for the leak ( what I think- even though we did a test of spraying ether on all the areas above the throttle body and no change in monitor readings - I am still thinking EGR area)- will not a continued LT fuel trim that is that much to the positive cause damage to the car if not corrected? I am thinking, even though no flashing CEL, this has to take a toll on the cats.

Any opinions.

Thanks

Tom in Dallas/Plano as a proxy for
2000 XKR 90K

 

Expect to need cats if left as is.

What are fuel trims at idle and what happens when revved to 2500? Those values will tell you if it's a leak or something else entirely.

 

Check the underside of the air intake pipe bellows for cracks, and that it has not slipped off the end connection to the MAF housing.

 

I had 171 and 174 it was a loose egr valve

 

That is all new. I have given up. This is a guy who is stuck in the past with old cars, some 12 of them that do not run or start and did not understand fuel trims until about 3 months ago whne he read some of what Gus had posted.Gus offered to speak with him, but one of these know it all, based on what a car of the 60s-80s might do. Still a great human being, but stuck in the past on cars and a little of the attitude that he will figure out something that no one else ever has on a car that is 15 years old.

He has new air intake, so the bellows are new and not a problem. I had already done the idle and 2500 and it shows a clear air leak. We sprayed ether, as indicated, all around that area, MAF, air filter, top of throttle body and every area that was easy to access. No go. MAF is clean. Is is possible for the MAF to go bad and never show any codes in the p0101 ranges that monitor the MAF?

I know it is most likely the ERG, as that is about all that it is left that would throw both codes.

My big concern is what will happen by driving and continuing to clear the codes and RP without fixing the problem and what damage will ensue. I was guessing the Cats will eventually start throwing a p0420 and p0430. I am surprised that it does not show a flashing CEL, but I am not driving it and who knows.

Thanks again

Tom in Dallas/Plano

 

Thanks. Already have done and clear leak. Since a no show on spraying ether all around the obvious areas, I am fairly convinced that it is in the EGR, but read my response to RJ237 and you can see it is a hard problem. I was just verifying that the continued problem without solving would be throwing a bunch of fuel into the cats

Tom

 

The egr bolts do sometimes come loose, but I don't think you can tighten them without removing the throttle body. Have you checked the part load breather tube?

 

All of that is new. I am just dealing with a stubborn owner and more interested in the damage he can do by not fixing and continuing to drive. I am about 100% positive as to where the problem is, but.... well you know how some can be.

T

 

as far as the cats are concerned pretty soon he won't see an RP message - he'll see the RIP message

 

Thanks- as I thought.

Tom

 

i had a MAF problem with no obvious dirtiness, as well as a couple of leaks that didn't show up using a spray can.

Both were around the breather tubes - the worst was the part load breather which had a hole in it down under the charge cooler.

I saw both leaks with a smoke test (although it took me an age to actually pinpoint the part load breather leak) and recommend you try the same

the egr valve does seem quite a common problem too, equally the breathers (part load in particular) are a frequent cause of leaks

 

If you were to do a smoke test on the car you will see all areas that are leaking. Having both left and right codes the problem is one related to both sides.

 

Trying to get the guy to move on items is like moving a mountain. I was really more inquiring that in not fixing this problem and driving and resetting the codes and RP would lead to some damage in the car, especially the cats.

Tom

 

Yes damage is possible then you ignore a code that is telling you something is wrong. My suggestion would be to find out what is causing the codes.

We all understand the importance of acting on a problem but we also understand that you can lead a horse to water but you cannot make him drink.

 

On this XKR, if someone had a problem with loose bolts or relatedproblem with the EGR, would that show easily in a smoke test or might it appear to give a false positive and lead one to think that it was the leak was coming from the duct seal that attaches the air pipe from the air filter/maf?

See attachment- from anywhere in that area and below, would a smoke test be easy to see if that area had a vacuum leak?

Thanks

Tom in Dallas/Plano

 

The egr is far enough below the throttle body that it should be obvious.

 

If you have a leak in the engine bay the smoke test will find it.