Is There A Fix For Auto Trans Wont Shift Into 4th Until Warm?

[bronsin]

Originally Posted by 41magmag41

I checked gas mileage yesterday morning with my scan gauge during the warm up run to work. It was 31 degrees out. With the transmission lock out until warm up at 40 mph in third gear the scan gauge read 32 mpg the entire time before the car reached 137 degrees and it kicked into fourth. I don't consider that lousy gas mileage.

I think all this yaking about overriding the computer to get better gas mileage for a couple of minutes will do more harm than good. I've just offered proof that the car still gets decent mileage when it's in the warm up mode before 4th gear is available. Why not leave well enough along. My girl has 98000 miles on her and I average 38 to 41 mpg year round when averaged together. I don't baby her in the interstate, run 75 to 80, and still get good economy.

Much to do about nothing other than to hear yourselves talk. Have a good day.

You may be right but I dont trust any scan gauge. I have an instant mpg readout on my motorcycle. Before it says the engine is at operating temp it reads like 20 mpg. Thats in fifth cause it shifts when "I" want it to. It reads 40 mpg when warm. Actual mpg in winter covering the same distance is ~30 mpg. The idle rpm is 3000 until warm also. Another government/manufacturer intrusion into my life... I will adjust that this summer though. And perhaps a hotplate warmup is in order next winter...

[Astroman]

However, with all due respect, without a reference, your assertion is just another hearsay post.

I don't post hearsay, but heres your reference: http://www.yarisworld.com/forums/showthread.php?t=1579

It's in the owners manual

[41magmag41]

Originally Posted by bronsin

You may be right but I dont trust any scan gauge. I have an instant mpg readout on my motorcycle. Before it says the engine is at operating temp it reads like 20 mpg. Thats in fifth cause it shifts when "I" want it to. It reads 40 mpg when warm. Actual mpg in winter covering the same distance is ~30 mpg. The idle rpm is 3000 until warm also. Another government/manufacturer intrusion into my life... I will adjust that this summer though. And perhaps a hotplate warmup is in order next winter...

what an "engineer" that doesn't trust insturments?