Bacjfiring like crazy at wot sounds like a machine gun shooting out the tail pipe
Check engine light started flashing for 5 seconds then went off


Any ideas?

 

injector seals.

 

This man speaks the complete truth. I take it, OP, that you're running E85 or some blend of it?

 

Good old regular 94 only, sometimes 91

 

Could still possibly be ur seals bud. 94 is e10...

 

take it back to dealer its under warranty.

 

stop banging into the rev limiter.

 

Since I've owned this car I've only hit the rev limiter once

 

Same thing happened to a while back when I was on 93 octane. Can't remember exactly, but it had something to do with my injectors, GM also covered it under warranty

 

Does it randomly pop at idle to or does it idle normal?

 

Some have lost an injector seal on regular gas. It does happen. It's just very rare.

 

Idles normal

 

did it sound like cannons?
why have guns anymore when u can just hit two step - YouTube

no wait you said machine gun fire... like this?
Fun on the blvd - YouTube

 

Not sure but you did you try to NLS before the car was warmed up to at least 180F Coolant temp? That will cause that. Also, you should check your plug gap just to eliminate that.

If your car is tuned, get with your tuner and send a log of it happening. It *could* be something like injection window misfire.

I agree that it does sound like injectors but check the other stuff just to eliminate them.

 

he has gms1. old plugs?

 

More like the second vid, dunno if I've got flames poplin out the tail pipe tho lol

I have never tried to nls

I have owned the car for 20 000km I've never changed the plugs car has 60000km on it so not sure if there original or not

Here's a pic of the plugs

There was some water in the # 1 plug cavity, not a lot but was wet

 

i change plugs with every oil change for good measure

 

Can you take a vid and post? Could be a seal, could be the plugs(blowout) or tune(even GMs1). If you need help with installing seals let me know. Just did mine last weekend and did it in 2 hours.

 

Cannot post vid as it is no longer doing it...???:s

 

Seems a lil excessive but I def will change the plugs

 

My car tuned liked plug changes every 15k

 

Had the machine gun backfire, found wires on map exposed and shorting on coldside charge pipe. This caused 1st o2 sensor on turbo to go bad. Fixed wires, changed plugs and o2 sensor and all is well!

 

Like a Bauossssss!

 

You fixt it!!

 

Lol didn't do anything Cept pulled the plugs to look at um