garye

i have a 2013 427 with cam and A&A corvette supercharger.The car was running fine then I stopped in Spearfish S.D. for an oil change. Within 50 miles after that my car started to sound like it was misfiring until It hit 2500 rpm then it smoothes out in any gear. I took it in to a tuner and he coukdn't tune it out, had my exhaust checked they replaced a co2 censor, ran great for about 10 miles then the problem came back. Noone in the Dakotas seem to have any idea what it is or what to do. Now I'm left not knowing what to do, it sounds like crap under 2500 rpm, any ideas or anyone have a direction I might take to solving this issue> No misfires according to the tuner but that is what it sounds like. HELP

BadAV

At this point, with no codes, it's an absolute shot in the dark. Check out all of the usual suspects like plug wire connections, etc, although it's unlikely you will find anything like that based on the symptoms.

Try doing a crank relearn, and possibly try a new crank sensor if that doesn't work.

MTPZ06

Did the oil change guys know what they were doing? 2 drain plugs to completely drain the system. Hopefully they didn't over fill and your intake is full of oil being ingested into the motor. Car blowing any blueish smoke out the exhaust? Have you checked your oil level (follow proper procedure for dry sump car).

garye

I will tomorrow, the oil change was done at a chevy dealership, I would hope they know what the are doing

Cherokee Nation

Maybe one out of a hundred can do it right.

MTPZ06

Dealership horror stories on here all the time...unless they do a ton of dry sump cars, they make mistakes all the time. Get the oil temp up to at least 170*, shut the car off and let sit for at least 5 min, but no longer than 15 min, and pull dipstick to inspect. If you have oil registering above the top hole, there's too much oil in your car. Ideally, you should be somewhere between the top and middle holes.

garye

did ghat, nada!

MTPZ06

See if you can swing by an auto parts store that will loan you a scanner to see if there's any stored codes. Napa, Auto Zone, etc.