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  #51  
Old 09-07-2010, 09:23 PM
frontrange frontrange is offline
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Well I offered you a loaner set of injectors, or to do a quick test on yours, but go on with your plan. BTW, a bad cat has nothing to do with running lean.

If you are running lean at this point you should be checking your fuel rail pressure and injector flow rate. Actually that should have been step 1. I'm going away now and not coming back to this thread anymore.


Last edited by frontrange; 09-07-2010 at 09:47 PM.
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  #52  
Old 09-08-2010, 09:22 AM
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PabloCruise PabloCruise is offline
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Quote:
Originally Posted by Front Range 4x4 View Post
Quick update - Air Care Tech found:

1. A bad EGR solenoid. I guess when I found the bad EGR valve I stopped trouble-shooting. Didn't really matter, hardly changed the NOx reading when I replaced it.

2. It appear to be running lean - not sure how to resolve that yet.

3. Recommended going back to dual cats,

Scotty is warrantying my year old cat tomorrow. I really think that may be the problem but I claim total ignorance and frustration at this point.

If that doesn't fix it I have an appt at Colorado Car Clinic next week. I stopped in there and Dave (IIRC) was good. Not very surprised to see another "Land Crusher" outside his shop.
If you are running lean, and you already replaced O2 sensors, I would look at the injectors.
Upstream of injectors would be fuel flow (think pump and filter) and pressure (think fuel pressure regulator).
Have you checked fuel pressure?
How many miles are on your injector?
I think you can richen things up by tweaking the AFM.

Keep us posted!
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  #53  
Old 09-08-2010, 09:30 AM
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Quote:
Originally Posted by PabloCruise View Post
If you are running lean, and you already replaced O2 sensors, I would look at the injectors.
Upstream of injectors would be fuel flow (think pump and filter) and pressure (think fuel pressure regulator).
Have you checked fuel pressure?
How many miles are on your injector?
I think you can richen things up by tweaking the AFM.

Keep us posted!
Yeah, I'm waiting to see if the cat is why I'm failing emissions then I'll work on the lean condition. The FF, FP, FPR are fairly new but the injectors are unknown age and obviously suspect.
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  #54  
Old 09-08-2010, 04:54 PM
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The cat did it - NOx 4.2660/5.0 allowable.
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  #55  
Old 09-20-2010, 03:40 PM
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PabloCruise PabloCruise is offline
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That is cool that you fixed it.

Although I am not sure how much margin that is, passing at 4.266/5.0
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  #56  
Old 09-20-2010, 07:24 PM
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Not much margin at all but I passed. With the ever changing limits I guess I'll be running Chevy power when I go through a couple years from now.
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