I have a 2008 ss/tc and as far as mods go it has: drop in K&N, Synapse charge piping and catless downpipe. I've been noticing lately and than intentially tonight that when im in the top of 2nd gear at about 5200 RPM that its back firing bad, like popcorn. I'm doing the no-lift shifting, but i thought i still have about 1000 RPM before the rev limit. This also happens in third at roughly the same RPM. Didn't get to try it in 4th or 5th. Any suggestions would be appreciated. I was thinking the downpipe mighta done something.

 

Rev limit is 6300...

 

sounds more like it's breaking up man, either leaning out, or spark blow out

 

My car used to do that, right about the same rpms, when it was fairly stock. I think its mainly plugs/detonation issue, but i've never really found a specific fix.

 

sounds like its time for a tune... maybe your car isnt liking the mods... try just swapping in the stock air filter and see what happens i know guys are having issues with intakes and such

 

i just put new spark plugs in, direct replacements from Auto Zone. Is there a way I can have something done under warranty or is this a SOL case?

 

let me see if i get this straight.......your performing a noliftshift at 5200RPM and not 6000RPM+???

 

From what i understand and what ive heard that is the charicteristic of a perfect no lift shift. it should pop one time.
Thats what some gm engineer or spokesperson said. If you search the forums i think there is something else on it here. I am a chevy tech, mine does the same thing, i search for bulletins on the matter and couldnt find anythign , so i m going to assume what
I heard about the pop is true. HOpe this is helpful

 

no. i try to get close to 6000 RPM, and then do the no lift shift, which i get one exhaust pop. However now when i reach 5200 RPM it starts popping and I shift at that point because if I don't it starts popping like crazy... like popcorn. I can't get to 6000 RPM

 

this has happened to me if my car is still cold.. i think its a spark plug issue. maybe its gapped wrong?

 

new plugs with same results?

 

when i no lift shift I do it at 6200 and i hear pop, but never before it, I believe your only supossed to no lift shift at like 6000-6250!!! So I only do it then, and only then

 

Umm, don't squeeze the car when its cold??

 

JimZ, I didn't notice the problem until recently. It was mere coincidence that i changed the plugs (not because of the back firing problem), however that may be it. Im gonna clean the original ones and put them back in and see what happens.

 

why did you change your plugs in the first place?

 

Gotcha. When you pull them, keep track which cylinder the plugs came out of, recheck the gaps and look for any hairline cracks in the porcaline and of course the color of the plugs. Hmm...any water in the fuel?

 

im thinking plugs

 

COULD be a combo of downpipe and plugs. Do plugs first and see what happens.

Coming from an RSX-S I know they had leaning problems when going to race headers.

 

correct me if im wrong but he said it starts popping when he is still on the gas before he shifts... thats why he started shifting it soo low

 

Why did you change the plugs?

Stock plugs are good for AT LEAST 50k miles

 

my car did the exact same thing.....when the MAF was unplugged...lol
regardless, it doesnt hurt to check your MAF

 

are they Bosch pieces of junk platinum plugs by any chance?

 

Could also be that the plugs are gapped too wide...

 

correct, he confirmed that on the 1st page, definately a weird problem, gl with finding a solution so u can push to redline again, i'm sure u miss it

 

maybe detenation from to much air, does thecheck engine light flash when this happens?