recall

duanerw · 10-22-2005, 09:05 AM

I went to my toyota dealership on the 17th for my recall.I know the tech well and as i was going on the road the next day he worked me in.I havnt received my recall in the mail but he did it for me anyhow.
I stayed by the car most of the 2 hrs it took and he went by the book,page by page,This was the first one he did under this recall.As i said i know him well and trust him more than anyone i know.He did both updates on the computers one about 30 min and the
other about 20.my car was made in nov 04 and i purchased it jan 31 2005.
I went on my trip the next day which was 840 miles.On prior trips i got 54 mpg and on this one i got 48 up and 48 back not counting running around when i got there.
When i got there i checked my tires and found 29.5 all the way around.dam oil change.I told them 35 and 33 and the guy that did the oil change said he did as i said. I know I should have checked so dont give me hell.......
while there i went to the goodyear store and he made sure i had 35 front and 33 rear.
i have comforttread and they dont recomend higher than 35. 33.
with the proper preasure i returned home and got the same mpg 48 as i got with low preasure.
I never have had a problem with the car and wish i had not done the upgrade as i lost mpg.
im not recomending you have it done or not just letting you know how it went for me

tumbleweed · 10-22-2005, 12:15 PM

Any other possible explination for the decrease in milage? A drop in temprature, wind, anything like that? Let us know, after a few more tanks, if it is still lower than it was.

**efusco** · 10-22-2005, 12:28 PM

I'm not willing to accept that it will affect gas mileage with one example. I think I mentioned in another post how unfortunate it is that this SSC is coming out just as the weather is turning colder in most of the country and people will, no doubt, see a decrease in gas mileage and will probably want to attribute it more to the SSC than to the weather.

I think the only way we'll really know is by comparing to prior similar months.

I am especially skeptical in your case b/c the affect on fuel economy shouldn't really be significant for highway driving since the ICE runs more or less continuously anyway.

Here's the thing. Supposedly the flash 'encourages' the ICE to continue running longer/delays ICE shut off at low speeds and stops. Thus, in city and low speed driving you'll have longer ICE-on times and thus more fuel burned and lower mileage. But with a hwy drive the ICE is on mostly continuously and there should be no reason for any affect/impact on mileage.

Regarding your recent trip specifically I agree that wind, weather, and other factors may be the major players...you definately should have seen an improvement in fuel economy by boosting the tire pressure to spec. Since you did not that strongly suggests that you had a head wind or colder temps or something holding that mileage down.

hdrygas · 10-22-2005, 02:03 PM

Also when did you do fill ups? I just took a 3-4mpg hit last tank because of the switch from summer gas to winter formula that happens in October around here. Same thing last year. Temps a little cooler but still in the 50's in the AM. When do you change to winter formula in your area? I have not got my letter so I should have a good base to compare with when I get my recall.

NiMHPrius · 10-25-2005, 03:11 PM

Don't worry,

The update they do to the computer recalibrates and reset some of the internal flash memory that keeps a running log of various parameters of the car. The fuzzy logic in the software will take two to three refills of gas to eventually "recalibrate" itself and you will see your mpg go back up. That's exactly what happened to me. I also complained about this and someone on this forum told me the same thing I'm explaining to you know.

Take care

HiMHPrius

Marlin · 10-25-2005, 04:11 PM

Quote:

Originally posted by efusco@Oct 22 2005, 12:28 PM
Here's the thing. Supposedly the flash 'encourages' the ICE to continue running longer/delays ICE shut off at low speeds and stops. Thus, in city and low speed driving you'll have longer ICE-on times and thus more fuel burned and lower mileage. But with a hwy drive the ICE is on mostly continuously and there should be no reason for any affect/impact on mileage.

[snapback]144088[/snapback]

But didn't all the reported stalling problems occur on the highway rather than at low speeds and at stops?

**efusco** · 10-25-2005, 04:15 PM

Quote:

Originally posted by Marlin@Oct 25 2005, 02:11 PM
But didn't all the reported stalling problems occur on the highway rather than at low speeds and at stops?

[snapback]145407[/snapback]

Didn't occur at stops, but it can occur at low speeds if trying to accelerate--it's the sudden demand that can't be met that causes the problem.

DanMan32 · 10-26-2005, 02:46 PM

Part of the recalibration changes the power balance. Even now, when loads change, I find my MPG appear lower than it should, but soon the SOC goes to green, and then the ICE runs at lower power.

So, yes, you can see lower MPG even at highway speeds, but should eventually even out, especially when the ECM and HV adjust their trim.

Ron K · 10-30-2005, 04:20 PM

I am on my first tank post re program and also notice a substantial city loss, from Mid 40s to high 30s. admittedly only a 100 or so miles

I don't suppose we can revert (I never had a problem with stalling anyway)

Ron

LaughingMan · 10-30-2005, 04:43 PM

I have a Prius manufactured in May 2005, so I didn't have to do the update...

But I have to wonder if after the update, if a Prius manufactured during those affected months basically is brought to the same software as my Prius.

So... do the 2004 and early 2005 Priuses now behave like my car in terms of how it handles the ICE?

Interesting...

10-22-2005, 12:28 PM	#3
efusco Troll Slayer Join Date: Nov 2003 Location: Nixa, MO Posts: 17,250 My Car: 2004 Prius Model: Package: #9 Thanks: 50 Thanked 261 Times in 157 Posts Friends: 37	I'm not willing to accept that it will affect gas mileage with one example. I think I mentioned in another post how unfortunate it is that this SSC is coming out just as the weather is turning colder in most of the country and people will, no doubt, see a decrease in gas mileage and will probably want to attribute it more to the SSC than to the weather. I think the only way we'll really know is by comparing to prior similar months. I am especially skeptical in your case b/c the affect on fuel economy shouldn't really be significant for highway driving since the ICE runs more or less continuously anyway. Here's the thing. Supposedly the flash 'encourages' the ICE to continue running longer/delays ICE shut off at low speeds and stops. Thus, in city and low speed driving you'll have longer ICE-on times and thus more fuel burned and lower mileage. But with a hwy drive the ICE is on mostly continuously and there should be no reason for any affect/impact on mileage. Regarding your recent trip specifically I agree that wind, weather, and other factors may be the major players...you definately should have seen an improvement in fuel economy by boosting the tire pressure to spec. Since you did not that strongly suggests that you had a head wind or colder temps or something holding that mileage down. __________________ Evan E. Fusco, MD "It's a damn poor mind that can only think of one way to spell a word." -Andrew Jackson

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10-22-2005, 09:05 AM	#1
duanerw senior member Join Date: Feb 2005 Location: lexington ky Posts: 90 My Car: 2010 Prius Model: III Package: Navigation Thanks: 0 Thanked 1 Time in 1 Post Friends: 0	I went to my toyota dealership on the 17th for my recall.I know the tech well and as i was going on the road the next day he worked me in.I havnt received my recall in the mail but he did it for me anyhow. I stayed by the car most of the 2 hrs it took and he went by the book,page by page,This was the first one he did under this recall.As i said i know him well and trust him more than anyone i know.He did both updates on the computers one about 30 min and the other about 20.my car was made in nov 04 and i purchased it jan 31 2005. I went on my trip the next day which was 840 miles.On prior trips i got 54 mpg and on this one i got 48 up and 48 back not counting running around when i got there. When i got there i checked my tires and found 29.5 all the way around.dam oil change.I told them 35 and 33 and the guy that did the oil change said he did as i said. I know I should have checked so dont give me hell....... while there i went to the goodyear store and he made sure i had 35 front and 33 rear. i have comforttread and they dont recomend higher than 35. 33. with the proper preasure i returned home and got the same mpg 48 as i got with low preasure. I never have had a problem with the car and wish i had not done the upgrade as i lost mpg. im not recomending you have it done or not just letting you know how it went for me

10-22-2005, 12:15 PM	#2
tumbleweed Senior Member Join Date: Oct 2005 Location: Eastern Oregon Posts: 1,692 My Car: 2010 Prius Model: V Package: Adv. Technology Thanks: 33 Thanked 105 Times in 84 Posts Friends: 0	Any other possible explination for the decrease in milage? A drop in temprature, wind, anything like that? Let us know, after a few more tanks, if it is still lower than it was.

10-22-2005, 02:03 PM	#4
hdrygas Senior Member Join Date: May 2004 Location: Olympia Wa Posts: 3,650 My Car: 2004 Prius Model: Package: #9 Thanks: 0 Thanked 2 Times in 2 Posts Friends: 0	Also when did you do fill ups? I just took a 3-4mpg hit last tank because of the switch from summer gas to winter formula that happens in October around here. Same thing last year. Temps a little cooler but still in the 50's in the AM. When do you change to winter formula in your area? I have not got my letter so I should have a good base to compare with when I get my recall.

10-25-2005, 03:11 PM	#5
NiMHPrius Join Date: Jul 2004 Location: S. Calaifornia USA Posts: 33 My Car: Model: Package: Thanks: 0 Thanked 0 Times in 0 Posts Friends: 0	Don't worry, The update they do to the computer recalibrates and reset some of the internal flash memory that keeps a running log of various parameters of the car. The fuzzy logic in the software will take two to three refills of gas to eventually "recalibrate" itself and you will see your mpg go back up. That's exactly what happened to me. I also complained about this and someone on this forum told me the same thing I'm explaining to you know. Take care HiMHPrius

10-26-2005, 02:46 PM	#8
DanMan32 Join Date: Aug 2004 Location: Tampa Bay, FL Posts: 3,775 My Car: Model: Package: Thanks: 0 Thanked 0 Times in 0 Posts Friends: 0	Part of the recalibration changes the power balance. Even now, when loads change, I find my MPG appear lower than it should, but soon the SOC goes to green, and then the ICE runs at lower power. So, yes, you can see lower MPG even at highway speeds, but should eventually even out, especially when the ECM and HV adjust their trim.

10-30-2005, 04:20 PM	#9
Ron K Member Join Date: Aug 2004 Location: Yorba Linda, California Posts: 31 My Car: 2004 Prius Model: Package: #6 Thanks: 0 Thanked 0 Times in 0 Posts Friends: 0	I am on my first tank post re program and also notice a substantial city loss, from Mid 40s to high 30s. admittedly only a 100 or so miles I don't suppose we can revert (I never had a problem with stalling anyway) Ron

10-30-2005, 04:43 PM	#10
LaughingMan Senior Member Join Date: May 2005 Location: Marlborough, MA Posts: 1,387 My Car: Model: Package: Thanks: 0 Thanked 0 Times in 0 Posts Friends: 0	I have a Prius manufactured in May 2005, so I didn't have to do the update... But I have to wonder if after the update, if a Prius manufactured during those affected months basically is brought to the same software as my Prius. So... do the 2004 and early 2005 Priuses now behave like my car in terms of how it handles the ICE? Interesting...