Lean Code Help

[Arissett]

I’ve had this lean code for awhile now. I’ve narrowed it down to what appears to be a vacuum leak but I want to share my trucks numbers just to confirm. I also want to share some weird stuff that’s been happening. So my long term bank 2 has been in the 20’s for awhile I’m assuming this is my lean code and my vacuum leak as it drops to about 15-18 when I drive. Are these O2 sensor readings healthy? When I’m driving they tend to fluctuate between -3 and 5-6. It does stay closer to 0 most of the time though. Bank 1 is confusing me because this actually just got out of wack today. I just started to seal my exhaust leak yesterday and now today bank 1 is positive. It’s always been at like 0.5-2. Also the check engine light has never turnt off and my numbers are definitely not correct but now both of my scanners are telling me I have no codes. UPDATE: My heat and ac now just come out the defroster and no longer through the vents.

 

[Turdle]

You may indeed have a vacuum leak

How to: - 2nd Gen NO AC ( or heat) FROM VENTS!!! A "How to" what to look for thread

Here is what to look for if you have a 95-01 with cold ac, and hot heat, but it only blows from the defrost vent. IF YOU HAVE COLD AND / OR WARM AIR BLOWING FROM DEFROST DUCT ONLY THIS THREAD IS FOR YOU!!! I will immediately delete all ac cooling questions without answer-let's stay on track...

www.explorerforum.com

 

[Arissett]

You may indeed have a vacuum leak

How to: - 2nd Gen NO AC ( or heat) FROM VENTS!!! A "How to" what to look for thread

Here is what to look for if you have a 95-01 with cold ac, and hot heat, but it only blows from the defrost vent. IF YOU HAVE COLD AND / OR WARM AIR BLOWING FROM DEFROST DUCT ONLY THIS THREAD IS FOR YOU!!! I will immediately delete all ac cooling questions without answer-let's stay on track...

www.explorerforum.com

I read the forum you linked and I thank you because that’s definitely why my ac and heat don’t work right but I’ve had system lean on bank 2 at 20% for awhile before this ever happened. This ac stuff just happened today out of the blue. Do you have any idea what that could be?

 

[Turdle]

Have you checked fuel pressure?

Could be low fuel pressure. Could be bottom fuel injector o rings leaking air. Could be intake gasket leak on driver side.

Which engine is this ?

 

[Arissett]

Have you checked fuel pressure?

Could be low fuel pressure. Could be bottom fuel injector o rings leaking air. Could be intake gasket leak on driver side.

Which engine is this ?

5.0 1999 XLT Explorer

 

[J_C]

Might be time to do an intake smoke test to find the vac leak.

Low fuel pressure can cause a lean condition but the HVAC coming out the defrost is typically a vac leak which can cause all this by itself so I would focus on looking for a vac leak first.

 

[crunchie_frog]

check the hose that runs from the front of the intake manifold to the evap cannister, under the battery. These are prone to rot and get leaks.

 

[410Fortune]

Also the egr valve can develop a leak
Or intake plenum gaskets
Or
Pcv valve popped out of its hole.
Check fuel pressure first should be 64 psi +/-

 

[Arissett]

Also the egr valve can develop a leak
Or intake plenum gaskets
Or
Pcv valve popped out of its hole.
Check fuel pressure first should be 64 psi +/-

Thank you will keep noted