I had my car pro tuned by a local shop. I had some cold weather drivability issues as well as a nasty buck that would occurs between vacuum/boost with light throttle in all gears. I contacted an etuner that did a great job of getting the car to run well in cold weather and even get the bucking sensation between the vacuum/boost in all gears with light throttle to go away. Now I have a new condition. The car refuses to start off the line with any more than a light throttle. Moderate acceleration turns into a violent buck and backfire as I let the clutch out with tons of black smoke. I have tried an identical launch with a bone stock Evo with zero drama. (Hoping it was driver error). My thought is the current tune has some areas that need work bases on the throttle, load, and speed? I’m not a tuner and I’m basing my deduction solely on my experiences driving it and other Evos. Are there adjustments for throttle, speed and load ratio?

 

have you checked your fuel relay?

The other thought is, your fuel maps have a number of rich spots in it from the adjustments for colder temps. (ie the coal roll you have out the back). I would go back to the Etuner and have him or her look at the low load / load RPM tables on your fuel map and see what they look like....

There is also the chance that your front O2 sensor is going bad or is already bad.... not sure what all you have done with the car or if anyone played with the bypass O2 errors but that could also be an issue to think about

The crappy thing is that any one thing could be an issue after the etune.... no fault of the tuners, these cars are just moody little ****s all the time! I live in Chi town and my front O2 was giving me issues once it got below 0 outside, i would clear the code, it would be good for days, got below 0 and the damn thing would pop a code...

I would start with having your Etuner look at your fuel map and then maybe get the latest fuel relay. You could also pull the back seat and make sure there's nothing wrong with the fuel sending unit.... my boy just had his 2014 GSR pissing fuel all over the underside of his car and ground b/c he sending unit housing cracked! Not so say that's your issue but, something could be out of sort at the sending unit...

 

Wonderful. The tuner has blocked me on messenger. I wondered why I never got responses when I mentioned the issue. I’ve now paid for two tunes that I’m stuck with��

 

Always pay with American Express so you can go back and refuse charges.

Get a better tuner involved. If you don't have one in your area there are a lot of good e-tuners. Stay out of boost till then imo. wtftuned does tuning and there are a lot of other good ones.

 

There are some excellent tuning shops within driving distance of you (used to live in that area). Might be worth the drive to have a shop look at it in person and tune....not that it helps with what you have already spent.

 

As said above WTF tuning has a great name out there for Etuning. If you have an accessport you can DL a OTS map from COBB and run that for a while. The maps are free and safe enough that you dont have to worry about the car that much. You can also call them and give them a rundown of the mod list and they can recommend something for you or what map you should be running. They are good and always willing to help

 

Who is it? Call him out and let him defend himself. This is why I'm so hesitant on getting a tune... What mods do you have, or possibly missing?

 

Contact English Racing for an Etune, your car will run right, and if there are issues, they are great with offering support.