As the temp drops, my warmup AFR... - Miata Turbo Forum - Boost cars, acquire cats.

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Old 10-01-2009, 08:13 PM   #1
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Default As the temp drops, my warmup AFR...

Is getting higher and higher.

I'm uncertain which parameters to tweak in the warmup section to bring the AFR's back down.

My cold AFR's are up in the 17-18 range. Actually, I've been able to boost the % increase by water temp, but as I reach the top of that scale (160 degrees), I suddenly get very lean. I am idling at 14.8 - 15.0 once the car is really warmed up.

Any guidance appreciated!
Jim
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Old 10-01-2009, 08:22 PM   #2
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17-18 range is very lean, 14.8-15 is richer than 17...
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Old 10-01-2009, 08:42 PM   #3
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Yeah, I know that.
My post wasn't very clear.

As it's getting colder, the warm up idle is getting leaner (pushing 17-18). This acute as I reach the top of the warm up enrichment temp (160 degrees), but before I'm at full warm (172 ish).

Once fully warm, I'm bouncing between 14.8-15.00.....

Does that make more sense?
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Old 10-01-2009, 08:43 PM   #4
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If you think 14:1 is lean, post up some high res shots of your meltdown
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Old 10-01-2009, 09:17 PM   #5
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Add more fuel to your idle cells newb. This happens as the temps get colder outside. I have to adjust my idle every 2-3 days this time of year.
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Old 10-01-2009, 09:58 PM   #6
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Quote:
Originally Posted by wayne_curr View Post
I have to adjust my idle every 2-3 days this time of year.
just curious what do you do once the car is warmed up? Do you lower the fuel? If not it would be running pig rich wouldnt it?
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Old 10-01-2009, 10:15 PM   #7
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Quote:
Originally Posted by triple88a View Post
just curious what do you do once the car is warmed up? Do you lower the fuel? If not it would be running pig rich wouldnt it?
Warmup enrichment.
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Old 10-01-2009, 10:39 PM   #8
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sounds like you need to adjust coolant related air density to use AIT. I had the same problem until I played with those settings. Now it stays around 13.5-14 all year round.
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Old 10-01-2009, 10:40 PM   #9
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I'm not doing a good job of explaining the situation here.

I am using warmup enrichment. It works as expected up until I hit 160 degrees, then it goes very lean.

If I add fuel to the cells, I run rich when I am warmed up.

If I bump up the warm up enrichment percent, when I hit 160, it steps back and is lean.

I can post a log if that would help describe the situation.
Jim
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Old 10-01-2009, 10:53 PM   #10
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so you're saying at 200* or whatever your operating temp is, the AFR is fine?
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Old 10-01-2009, 11:35 PM   #11
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and its lean only between 160 till about 200ish?
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Old 10-02-2009, 07:57 AM   #12
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Yes.. once fully hot, idle afr is 14.8 - 15 ish.
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Old 10-02-2009, 09:43 AM   #13
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then it's your warmup enrichments. possibly need to tweak your AIT-based air density table.
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Old 10-02-2009, 09:52 AM   #14
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Quote:
Originally Posted by braineack View Post
then it's your warmup enrichments. Possibly need to tweak your ait-based air density table.
+1
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Old 10-02-2009, 10:45 AM   #15
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Cool. Thanks for the pointer. I'll fiddle with that and see it if helps.
I also picked up a wells tps to stick on it. I'm hoping that helps some of the other idle suckage.
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