I took my 06 in Tuesday last week to have some work done. When I got it back, the shop ticket didn't say anything about a reflash, but I notice my performance is down and my mileage is up. Before, it seemed like my truck had a lot of zip at 2/3 to full throttle from 2400 rpm to 3100. Now it seems kinda like more noise than go. It doesn't put me in the seat like it did before.

Now, instead of the usual 11.8 mpg I get on my 4 mile trips to work, I'm getting around 13 or so. This isn't necessarily bad, but I miss that zip I had before For a measly 1.2 mpg, I'd like to have that performance back. If it was going to be 15 or 16 instead of 11.8, then I'd leave it alone.

Anyway, has anyone else noticed a decrease in performance when a new flash is installed? Now I wish I had a boost guage because it seems like I had more boost before.

My truck was built February 22, 2006. I bought it new October 30. I figure there was probably a new flash out to fix something between those months and they updated me.

Would it show on my ticket if they reflashed? Thanks.

 

Check you airfilter. it maybe clogged. As for the overhead do not trust them

 

You think his air filter is clogged on a vehicle that is only a month and a half old? I would hope not

Derek

 

I've got 1400 miles on the truck and the filter is not clogged. I also hand calculate the mileage and fill up once a week whether I'm 3/4 of a tank or empty because I'm near a truck stop every Monday.

 

Your mileage WILL go up as your motor breaks in...that's for sure. You will also notice a difference in your power and throttle response as you get some miles on there too. When I got my truck, I was getting 11 or 12 in the city, about 15 or 16 on the highway, now I am looking at 15 or 16 in the city and 19-21 on the highway...that is if I drive like I have some sense, but I like the skinny pedal too much I don't know why your truck would come back from the dealer WEAKER than when it went in, but I would definitely take it up with them. Ask them what all they did when they had it in their garage...if it's not stated on the receipt, that's pretty shady in my book.

Derek

 

If they re flash your truck they are supposed to put a sticker in the engine compartment with the TSB #.... and the date of re flash. Mine is near where the hood latches down above the radiator. It should also state it on your work order....

 

I checked in there last night and didn't see anything. I guess my "seat of the pants" meter is off. I must be getting used to the power.

 

If a re-flash has been done to address the white smoke on start-up issue, then the answer is yes.
This re-flash lower`s fuel rail pressure. You can not go back after it has been done.
As for stickers when re-flashed, I have never heard of it being done unless it`s a campaign.

 

I was wondering what that TSB for white smoke did........Darn. I did that one too.

Interesting....I wonder what the stock pressure WAS? What it is now?? Might give me an idea as to how much bombing I can SAFELY do...

Any ideas as to the fuel rail pressures before and after??

 

Was not a campaign.....it was a TSB for better automatic shifting and long crank for the Manual Transmission. Ive also seen them on used trucks I was looking at. Would not surprise me if some Dealers dont do this though. With my flash the truck runs the same but I have much better shifting......

 

A software reflash requires a sticker. Has to do with EPA etc.Does not have to be a campaign.Also it should be on your receipt.

 

Well, mine was updated with an EEPROM recalibration and had no label/sticker installed. The tech never mentioned it either.(Dodge Dealer)
I have updated thousands of vehicles (GM Tech) and never used a sticker/label unless it was an actual campaign.
The fact remains. If it was up dated with or without a sticker, the fuel rail pressure has been lowered. GM, Ford and Dodge all have this recalibration in there software updates. So be forewarned about re-calibrations and who`s got your truck ready for De-tuning.

 

My brother had his 06 reflashed and also lost power afterwards. He took it back to the dealer and they pretty much told him to bug off an that the trck runs fine. He ended up taking the truck to another dealer with a comlaint about low power and they refalshed with TSB 18-032-06 I believe and he got some of his power back but still not as zippy as before. Beware of flashes......

 

Great, this sucks. I bought my truck with 325 HP and 610 lb-ft advertised, now I've been downrated? My buddy's 06 Duramax, bone stock, leaves my Cummins eating his dust and I hate it. I tried a brake stand the night after my service visit, mashed the throttle and it just sat there at 1800 rpm. I had to start lifting off the brake pedal and the truck started moving forward before I could get a little chirp. It should have 600 lb-ft at 1600 rpm right? 600 lb-ft can't overcome the brakes in the rear? I'm definitely down on power since my service visit, I can feel it, no pop at upper rpm like I had before.

 

It also has torque management to keep from applying all the torgue in certain conditions.Someone that more versed on that can chime in.But its to keep from tearing things up,like the auto trans.