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jopo911's Avatar
 
Join Date: Jul 2003
Location: Latrobe, PA
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930 Warm Up Time

How long does it take your 930 to "warm up" before you start your drive? Mine takes a good 5 minutes before everything settles down and runs smooth. Starts right up, but AFR about 15, then slowly goes down to about 10.9 and slowly rises to 13 to 13.5. Just adjusted cold and warm pressures, and installed new rear fuel pump. Also disconnected Lambda O2 sensor. After warms up, runs fantastic! Is this normal?

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1986 Black on black 930
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GHL Exhaust Dual Exhaust, Wevo shifter and coupler
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Old 10-30-2014, 02:47 PM
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Start up for me AFR is at high tens then slowly rises to high 13's after 3 or 4 minutes, this would be on a 70 degree day. Don't have that 15 number like you do on initial start.
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Old 10-30-2014, 03:15 PM
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Same here, mid 10's for several minutes gradually going up to mid 13's. Starts rich and gets a little leaner as it warms.
After its really warmed up, driving for 20 mins say, AFR reads 13.8 or 13.9
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Old 10-30-2014, 04:35 PM
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Ditto. Rich when cold (AFRs in low 10s) gradually and steadily moving up to 13.8/13.9 as things warm. I've started my car with temps in the teens and at over 100 degrees and pretty much everywhere in between. Ambient temperature seems to affect only the time it takes to reach the high 13s. Don't recall seeing AFRs in the 15s at initial start up.
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Old 10-30-2014, 05:40 PM
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Your AFR's are too high for a "normal" cold start. WUR might not be working quite correctly. But then, it does eventually go down to 10.9, which is closer to what you should be seeing stone cold. Frankly, as long as she's starting easily and maintaining idle, then why worry about it.
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Old 10-30-2014, 06:34 PM
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Quote:
Originally Posted by gavinc69 View Post
Same here, mid 10's for several minutes gradually going up to mid 13's. Starts rich and gets a little leaner as it warms.
After its really warmed up, driving for 20 mins say, AFR reads 13.8 or 13.9
Ditto. Then when the lamba system kicks in, it goes to 14.7...

Bo

Old 10-30-2014, 06:37 PM
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