AFR really lean at idle only?

[Turbo Habanero]

I use a AEM Uego to see my AFR's and a Apexi SAF-C to tune.

Also not sure if it matters it does this with both setup's 560cc and Lexus AFM or Stock 440cc and stock AFM

I have not touched my Low map for tuning at all.

Idle (cold start) 13.2-13.8
Idle (Operating Temp) 16.3-17.1
Normal Driving is 14.5-15.5
Full throttle is 11.2-11.6

Any help as to why the warm idle is so lean would be greatly appreciated

Thanks in advance Jordan

 

[grimreefer]

Check your vacuum lines first.. maybe the oxygen senor or AFM might be dirty/burning out.. Is it giving you a check engine light/error code?

My girlfriends focus had issues with running lean ALOT, and every time it set off her check engine, and turned out to be an aging vacuum line.. one by one we ended up replacing nearly every vacuum line on that godforsaken POS

 

[Turbo Habanero]

No engine codes and its only strange at warm idle. I would think if its a faulty AFM/O2 it would do it in normal driving also correct?

Although my Vac is only at -16psi at idle on my boost gauge -20 while moving at 0% throttle

 

[mk3tattoos]

On my 7m and 1jz vac was at -20, could be a vac leak.
Replace all vac lines and use zip ties on all of them.

Also check for leaking gaskets on the intake and manifold, mine was leaking at the throttle body gasket.

 

[Turbo Habanero]

That's a lot of zip ties lol. I just did my Throttle Body gasket although i get the gasket from AutoZone (The hole is to small so it has to be cut with razor blade)

Also the hose from my Charcoal Canister that goes to towards the fire wall seems like it could be a Vac issue for my car.

Could the PCV system cause vacuum leaks? One comes to mind that could be my problem the Hose from Throttle body to metal pcv pipe also don thave clamps on the 2 short pcv hoses on the valve covers.

Any of this stuff seem like it could cause this issue?

Although the car idles strong.

 

[mk3tattoos]

Spray some brake cleaner around the throttle body while it's running, if the rpm's go up at all then you have a leak there.

What do you mean by a strong idle?
What rpm does it idle at?

 

[shipkiller]

should be at -20 at idle and -26~-30 when decelerating in gear (0 throttle)
you got a VAC leak for sure, like the other told you, check with brake cleaner around the TB and check the pcv vacuum line and stuff

 

[grimreefer]

Yeah, Id agree with whats been said, but normally if there's a leak you should be able to hear it.. listen closely, i normally would find the line leaks by feeling around and youll hear the increased suction if your finger pases by it.

 

[Turbo Habanero]

Spray some brake cleaner around the throttle body while it's running, if the rpm's go up at all then you have a leak there.

What do you mean by a strong idle?
What rpm does it idle at?

I mean no Pinging in the idle

Its at around 675-685 idle (warmed up)

 

[suprarx7nut]

How do you know it's not supposed to run leaner at idle? what are you comparing this to? The only time you *really* need to avoid running lean is on power.

 

[Mr. Joe]

Did you ever find a solution to your problem? My car is experiencing something very similar to what you've described.