outside temperature affecting a/f ratio
#1
outside temperature affecting a/f ratio
Currently around my area the outside temperatures are 98-100 degrees. During the night they fall to around 85-88. In the hot weather the cars a/f on the wide band is 14.2-14.6. this being stoplight idling and 2500 or below driving, 35-45 mph in town kind of driving. At night it will idle at a a/f of 11.8-12.2, and sometimes a little leaner. Driving light throttle 35 mph or so is 12.5-12.8. Any idea as to why? its tpi, ebl. Thanks
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Car: check
Engine: check
Transmission: check
Re: outside temperature affecting a/f ratio
IAT/CTS - Blend Filter
The higher the value the more CTS is used versus IAT. The final value is used as the inverse temperature term for the injector PW calculation.
RBob.
The higher the value the more CTS is used versus IAT. The final value is used as the inverse temperature term for the injector PW calculation.
RBob.
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Car: 1987 IROC-Z
Engine: 350 TPI
Transmission: 700R4
Re: outside temperature affecting a/f ratio
I may be misunderstanding, but if the vehicle is in closed loop during the time when the A/F dips down, I guess you may need to check your BLM status to see if you're maxed in the 160 area? Closed loop should give you consistant feedback across the board, and not drop out of stoich unless a parameter has been reached/exceeded. You may be fighting multiple issues in multiple tables/constants, or you are still in open loop as stated.
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