Random loss of power

[Gingerbeard Freddy]

So this was completely out of the blue,

I pulled out of parking lot, with the transmission in manual/sport, first gear, fine shifted into second at idk for sure 2.5k-3k gave it more throttle expecting, it to start picking up, and nothing revs went to 3k and the car just felt like it wasnt making boost, I know it was making some because I could hear bypass valve when coming off throttle. Drove it home and even in low gears around town I could not seem to get the car to gain power, so instead of revving the crap out of it got it home and shut it down.

Talked to a mechanic friend over the phone (so not the best way to diagnosis it) and we thought maybe something was in the CAI (clogged filter, filter saturated), that checked out fine. Drove it less than an hour later and everything was normal, car pulled hard when I wanted it to, and acted completely normal.

Any ideas, reminder my car is a '15 LTZ and the only mods are ZZP CAI, and ZZP catback exhuast.

 

[JesusTheAgnostic]

Check out my thread titled: no boost at all

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[JesusTheAgnostic]

I actually had boost but for some reason it was something like ten but the car was knocking and adding timing like crazy. It happened when I tried to accelerate in a higher gear. And went away when I turned off and then on the car. I'm tuned though so I'm not sure if it'll match your problem. I know Jerry fixed it by updating the tune. Have you had your check valve gone missing? How about the suicide disk has that popped yet? Mine started acting like that after those two things happened.

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[Gingerbeard Freddy]

I am not sure what a suicide disk, or check valve is. I am on stock tune, I also forgot to mention the car only has 44K miles on it, so if something is truely wrong, I am getting the work done under warrenty.

 

[JesusTheAgnostic]

Look it up on Google it should link you to the forums, I can't link you because I'm at work. The suicide disk is under the ecotec cover just remove it with the car running and. Ake sure it isn't sucking air in. The check valve you're gonna need help with

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[JesusTheAgnostic]

Try this:
http://www.sonicownersforum.com/for...gine-discussion/10825-1-4t-pcv-explained.html

That's about the check valve and I think info on the disk should be there.

Your issue sounds like the one I had, and my valve cover pcv broke around 45k miles, so check that. Soon after went the check valve in my intake manifold. It's the little orange thing. And then after that was the car not pulling unless restarted. These are common problems, though I think you would have known if the pcv had failed. It's quite scary, you feel like you actually broke the car.

 

[viperaider]

My car has 93k miles and it began idling very low on occasion. Then began missing at random times. Within two weeks now it shutters when im 50%+ throttle. I get no latching codes but the traction light will flicker and stay on for a few seconds and the engine light will blink but does not stay on. The PCV sounds plausible because when I changed the oil one time I didnt seat the dip stick and it idled erratically when I first started it.

 

[Gingerbeard Freddy]

Thanks guys, it resolved itself with a restart, but I still feel like every once in a while during hard acceleration, the engine will "miss" or feel like I hit a dead spot in the powerband, could this be a PCV valve, if so and if the car is under warranty, how do I explain this to the dealer to fix?


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[Gingerbeard Freddy]

So it's back at it again. My commute has become much longer these days, which includes at lot of open country roads. So naturally I thought I would drive faster. Cut to it, cruising at 65 decided to floor it and just cover more road faster, the car downshifted ( to assuming 4th gear) revved to around 5k and just hung there and after reaching 90 or so it felt like it stopped pulling and 90 was all it had.
I want to take it to a dealer to have this fix if possible how do I go about letting them know what to look for. Especially since it's finicky and can resolve on its own. Lastly no check engine lights and no codes show up


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