1. My Idle rpm and my idle AFP's are all over the place and my gas mileage sucks bad. Sometimes I idle rich, other times lean. Sometimes my idle is below 500 rpm, other times above 500 and sometimes above 1000.

2. When crusing and very light on the gas I run lean 15-16.0, if I give a slight amount of gas the I go rich between 11-10.0. When WOT its usually low 13's. When I decel in gear my afr's go off the chart lean. The check engine light came on this morning when at a light but went off once I started moving. Yesterday I replaced the O2 sensorwith a new one and the IAC with one a friend gave me, which means I have no idea if its any good. After changing both parts my condition seems to have worsened.

Setup Is T2854,1.8inj,begi AFPR.

Here are a few videos of my idle and AFR's. Please help me figure this out. I really want to get this fixed before I get my MS from Scott.

Thanks for your time.





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your settings are wrong...it is impossible to idle at 4-5 AFR's


edit-im not gonna delete what i said, but i am so wrong...i didnt watch the videos until after i posted...sorry

 

lol, have you had your coffee yet? Where the heck did you get 4-5 afr?
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looks pretty normal to me.

 

If you're using a mass-air system, it almost sounds like an intake leak. I don't have sound here at work so I can't hear how it's running. It SHOULD go full lean when you decel in gear (overrun shutdown).

 

thats what the screenshot looks like to me, maybe im blind, but it says 5.8 and one says 5.9 and the third says .4 etc.
nevermind, lol

 

Is that because I dont have any real engine management at the moment?

My fuel mileage is realy bad and idle is all over the place.
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Yes I still have my mass. I bet there could be an intake leak its not the best setup. Anyone else think so?
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word life

 

if you can unplug the iac and the idle isnt effected then its bad...whats your vacuum at idle?

 

Thats because the camera catches the lights flickering on and off.
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That is a wideband right?

16:1 idle doesn't sound normal to me. Does it idle rough? Any cause of missfire including
too much fuel will make the O2 sensor read lean.

 

Well I jut wend and unpluged the iac at idle and the idle dropped significantly. Plugged it back in and the idle went back up. Vacuum at idle is 19-20.
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It only idles rough when the idle itself is very low, otherwise no. Car runs strong, no missfire or hickups of any sort.
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I would expect an actual 16:1 idle to be rough. Did you mess with any of the crankcase vents that would cause the PCV system to suck in unmetered air? Pull the PCV and stick your finger over the end of it so that the intake can't get air through it. See if it changes the idle.

 

No change.
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Where is the Wideband sensor located in the exhaust?

 

after the cat delete "test pipe". Yes it is on the top of the pipe.
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Could the base idle pressure on the AFPR be set wrong?

Can a car even idle at 5:1 afr?

Whats having me scratch my head is that you say it varies, from rich to lean at idle.

Any pattern? Is it correlated to something? Engine temp perhaps?

 

I'm having a hard time getting past the smooth idle with a 16:1 mix. Can anybody else here idle smooth at 16:1? I normally have to go a touch richer than 14.7 to get a nice idle.