This problem first started about 2-3 weeks ago where "flooring it" off the line results in a noticable bog until about 2000-2500 rpms where the car accelerates as it normally would. Usually when I would go WOT when launching from a stop my car would spin the tires until about ~25mph. Now, with this bog, the tires don't even chirp from a stop. This bog only occurs from a stop if I go WOT, if I ease the pedal down or go ~1/2 throttle the bog doesnt occur. The car is perfectly drivable under all other circumstances and idles normally. I am very puzzled as to why this is happening. I've used the search button and found that others with the same symptoms were due to a vacuum leak on one of the PCV lines/ malfunctioning valve, or bad plugs and/or wires. I have checked all of the wires, but not the plugs seeing as they are new NGK-tr55's. I also looked over the PCV valve and associated vacuum lines and they all look intact. Any advice on how to better check for vacuum leaks, or suggestions would be greatly appreciated.

 

Do you have any scanning tools?. Datamaster?

 

Yes....No codes related to this. The only codes showing up are because of the problems the SS spoiler causes with the ABS/ cruise control.

 

Try taking yoru cats off, might be a clogged cat?

 

the ss spoiler dose not effect the abs in any way

 

Yes it does. There is a write up that shows how to fix this. The ABS/CC runs off this circut so these components won't work.


http://shbox.com/1/relay_for_ss_spoiler.jpg

There you go.

Did you just recently start using sticky tires (eg.. Et streets?)

 

The 3rd brake light will affect the cruise.

 

Try your fuel filter. Have you checked injector pulsewidths? Does it feel like a misfire or just no acceleration? Perhaps a transmission related problem. Have you checked for leaks in the air intake? Loose hose clamp on the TB? Tear in the boot?

 

I haven't checked the fuel filter/injectors but I will tomorrow. It is definatley not a misfire, its more like substantially less accelleration until about 2000-2500rpms on a WOT launch. I don't beleive its a transmission problem. I was having some trouble fitting the CAI to the MAF, but the bog continued even after that problem was resolved. I haven't changed to stickier tires either. I'll check everything that was suggested tomorrow after work and go from there.