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After I replaced my injectors I ordered a performance chip and after two tanks of diesel there was no impovement in gas mileage. The company suggested switching the wires in which I did but still no improvement. Has anyone else had that problem? I have a 2002 Silverado 2500HD Duramax
Which "chip" did you install (what power level are you using, if applicable), and what wires did you switch (what were they switched to, and from)? Do you have a noticeable increase in power? It should be obvious. What other modifications have you made, if any, to your powertrain?
Got it from Autochipsdirect.com It is easy to install having two wires that you connect to the correct color wire to your sensor on the air filter. It did absolutely nothing after 2 tanks of diesel. No modifications.
It's snake oil. It didn't do anything (positive), because it can't. Get your money back, if you can.
To get ANY benefit from modifying only the MAF signal value, it would have to be significant, and the PCM won't be happy (set DTC's and default fueling mode) well short of that. MAF signal mod's work, but only with additional tuning, which should be left to the DIY programmer experts. Holey pistons are no fun.
I will attempt to get a refund as that company does offer a "lifetime warranty" but I won't be surprised if I can't. The chip only cost me about $68.00 so I won't go bankrupt. I have heard from a few here locally that a chip worked for them, but also heard some got the same results as me. I used to get a bit over 15mpg but then some rough idling, smoke, etc so I changed out the injectors but now average 13.47 mpg. I was hoping the chip would put me back to a bit over 15mpg.
There are many ways to improve fuel economy, and driving habits is the most effective. Snake oil solutions have been around for decades, and the vast majority of them rely on the "placebo affect". Meaning, if a person installs something that's supposed to improve mileage, they'll change their driving habits to make that happen. The device(s) may seem to have worked, but in the end, it was their driving habit change that worked.
I suspect what you bought is nothing more than a $0.04 resistor, in a fancy box. In our world of shotgun marketing, it doesn't have to "work" very often for them to profit.
Good luck!
Talk to Kennedy at www.kennedydiesel.com
Retuning your truck will typically give a small improvement. But it's not cheap.