Help me figure my idle and AFR problem.
03-14-2008, 09:59 AM
#1
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Help me figure my idle and AFR problem.
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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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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03-14-2008, 10:17 AM
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lol, have you had your coffee yet? Where the heck did you get 4-5 afr?
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03-14-2008, 10:23 AM
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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).
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03-14-2008, 10:25 AM
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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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My fuel mileage is realy bad and idle is all over the place.
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03-14-2008, 10:27 AM
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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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03-14-2008, 10:28 AM
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Thats because the camera catches the lights flickering on and off.
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03-14-2008, 10:34 AM
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03-14-2008, 10:36 AM
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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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03-14-2008, 10:41 AM
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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.
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03-14-2008, 10:51 AM
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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.
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03-14-2008, 11:16 AM
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after the cat delete "test pipe". Yes it is on the top of the pipe.
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03-14-2008, 11:31 AM
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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.
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