Lean spike??

[morganson]

I have a question. I have a apexi afr monitor and after changing my o2 sensor i now get a stable reading. 10 at idle ect.
This ks where i become concerned. At cruise if i chop the throttle it spikes to 20 and may stay there until i tap the gas or may come right down.

Is this spike normal?

It does this on either the stock maf or the maft.

 

[1James]

By chop, do you mean close the throttle abruptly?

If so, then that is normal. If your engine speed is higher than idle and you have let off the throttle to cruise in gear, the ECU will turn the injectors off. Step on the clutch and watch your wideband return to normal idle AFR as your RPMs drop down to idle.

Hope this helps.

 

[IndigoMKII]

For a 7mgte, the ECU cuts fuel above 2k rpms while engine braking. Mine spits and pops on engine decel around 1800 rpms.

 

[morganson]

Thank you both. Thats what i needed to know. Just wanted to make sure it was normal.

 

[jetjock]

10 at idle?

 

[supranewbie]

Cylinder wash... It shouldn't go that rich until you're spooled up. What do you have for mods? Do you trust your reading? If it's really idling that rich I can't imagine it idling for very long. What do your plugs look like?

 

[Zrain25]

I get 14.5 at idle

 

[jetjock]

^ You should and so should he. Cross counting should still be occurring, albeit slowly.

 

[IndigoMKII]

Mine goes from 14.7 to 15.2 at idle