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Old 10-14-2007, 11:43 PM   #1 (permalink)
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ECU reflash?

Got a question...

when I had my 05 RX-8, I had the ECU reflashed a few times for various reasons. Also, the dealer had different flash versions that helped me with mpg, acceleration, different air/fuel mixtures, etc.

I always had them done for free if needed. I was wondering if Chrysler can also reflash your ECU- just kind of like a "reset"

Would pulling fuse 11 reset the ECU as well?
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Old 10-15-2007, 11:24 AM   #2 (permalink)
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Quote:
Originally Posted by wanna300 View Post
Got a question...

when I had my 05 RX-8, I had the ECU reflashed a few times for various reasons. Also, the dealer had different flash versions that helped me with mpg, acceleration, different air/fuel mixtures, etc.

I always had them done for free if needed. I was wondering if Chrysler can also reflash your ECU- just kind of like a "reset"

Would pulling fuse 11 reset the ECU as well?
Many known or common problems with the early 300's are addressed by reflashing the computer; check the list of TSB's - - that's the fix in many of them. But I don't think they will do it just for the hell of it; you have to be experiencing some sort of problem that the reflash might address to get it done for free under warranty.
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Old 10-15-2007, 03:19 PM   #3 (permalink)
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i just talked to a dealer service manager.. they said if the car isnt throwing any flashes, there is no way to flash/update anything.. i asked if they can reset it, as in delete and reinstall everything, he said thats not possible... so why is it that i was able to do both of those on my mazda?
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Old 10-15-2007, 04:33 PM   #4 (permalink)
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Quote:
always had them done for free if needed. I was wondering if Chrysler can also reflash your ECU- just kind of like a "reset"
I think you already answered your question. The Mazda place did it
"if needed".

When you go to your Chrysler dealer, why do you say you need to have
the ECU flashed?

If you don't need it, or if you are not having any problems with your car,
then there is no need to flash the computer right?

Now, if you are having problems with the transmission having a hesitation
going from 1st to 2nd, or your airconditioning stops blowing cold air after
a few hours, or some other problem that is computer control related,
then they might do it for you.

But, to just go in and say, hey, pull one of your techs off of a paying job,
and flash my cars computer for free, for no reason that I can think of other
than just doing it, will probably not sit well with them, as you have already
found out.

Some people have been successful in getting their dealers to flash their
cars computers with the SRT-8 flash for the 1-2 hesitation, and it has helped
the way the car shifts.

And then there are some who say it did nothing to their 300C, and they
wish they had never done the flash.

Also, remember, to flash the cars computer does not take only 5 or 10
minutes. It takes quite awhile to hook the car to a Starscan tool, upload
the proper software/version of what needs to be done, and remove the cars
original stock program, and replace it with the new stuff.

If I was you, and you wanted to see if they will flash it for you, search this
site for computer related problems, and see if you can have them flash your
car for one of those. But I doubt they will do it unless they can replicate
the problem.

Jim
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Old 10-15-2007, 05:18 PM   #5 (permalink)
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my reasons-
1) there is some vibration while acceleration, not so much hesitation, but there none the less. Could be the torque converter. They put some anti-foaming stuff in my tranny. Said drive it for 1000 miles and report back.

2) getting sheeeeshy mpg. thought it would solve the problem, since it did on my rx8.
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Old 10-15-2007, 05:40 PM   #6 (permalink)
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The gas milage is strange, but a flash of the computer will not do
anything for that, as there are TSB's out for low gas milage.

What type of milage are you getting? If its anywhere around 17 mpg, then
that is average, and not a problem. And don't go by the EVIC display. Always
do the total number of miles driven, divided by the total number of gallons of
gas used to get an accurate figure. The EVIC is close, but it can be off
if you gun it from stop lights, and punch it every chance you get.

Are you using low grade gas? Or gas from a no-name place? They don't
always have the best gas available for our cars.

Since you are having trans problems along with the gas milage problem,
then I will bet its trans related.

What month/year was your car made? There is a TSB for alot of 2005
300C's that has to deal with the rubber gasket on the transmission dipstick
tube not being properly seated at the factory, and water is able to enter
into the trans thru this spot.

If left unchecked, you will get enough water in there to ruin your trans, and
need a new one.

This problem starts out as a vibration, as you are stating, and gets progressively
worse, until the trans will not shift at all.

This sounds like your problem, if you have a vibration with your cars trans.

You should take a look at the TSB for the water in the trans, and tell your
dealer to check it out.

Jim
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Old 10-15-2007, 07:11 PM   #7 (permalink)
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its a 2007 300, base model 2.7L v6.

2600 miles.

avg mpg since day one has been anywhere between 17-20mpg with mostly frwy driving.

i usually pump Shell.

Hopefully I dont need a new transmission so early into ownership, but whatever- its covered under warranty. Hopefully the antifoaming solution will take care of it, if not, maybe the torque converter is the prob.
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