ok, so finally after getting the new pump installed in sept with new fuel filter/reg combo from acdelco at the same time, i got the car to idle, and run correctly. the tune in it sucks now, but its ready to be tuned correctly now. here is the run down.
-car was leaking fuel from on top of tank.
-take to dealer, have them replace fuel lines from pump to filter, replaced the pump, replaced the filter (never was done)
-all parts installed, took to tuner as soon as it was assembled, he tuned the car. it never idles corrected (sounded like it had a cam) and drivability was horrible. figured tuner sucked, so had it retuned 6 times, got idle better, drivability was still horrible. - it would shutter really badly when decelerating, throttle response was horrible (big lag when you would start to accelerate from a stop, after slowing down applying slight gas would load the car up pretty bad)
finally started thinking, hey, maybe the tuner doesnt suck, maybe its something else.
-replaced filter/reg combo
-replaced pump (cut hole in floor, very easy to do honestly, can post pix if anyone needs)
-checked all lines to see if they were bent or clogged.
this process has taken forever. in the end, it would found to be this.
the fuel pump i purchased had a regulator ON THE PUMP (if you get a new pump check this!!! very important!!) and the fuel filter i purchased has a regulator in it (the one that costs over 100 has a reg in it, the 10-20$ ones do not). this was causing the issue. went to oriellys bought the filter from an 06 cobalt ss (as tim had suggested since they are the same, which they are BUT DO NOT LOOK THE SAME!!) installed the part. fuel pressure dropped from 85-95psi at the rail to jumping between 55-65psi at the rail. my tune is dog poop and i was using a cheap gauge that caused the jumping around. but, figured id post this up because it caused me a lot of wasted money and even more frustration.
-car was leaking fuel from on top of tank.
-take to dealer, have them replace fuel lines from pump to filter, replaced the pump, replaced the filter (never was done)
-all parts installed, took to tuner as soon as it was assembled, he tuned the car. it never idles corrected (sounded like it had a cam) and drivability was horrible. figured tuner sucked, so had it retuned 6 times, got idle better, drivability was still horrible. - it would shutter really badly when decelerating, throttle response was horrible (big lag when you would start to accelerate from a stop, after slowing down applying slight gas would load the car up pretty bad)
finally started thinking, hey, maybe the tuner doesnt suck, maybe its something else.
-replaced filter/reg combo
-replaced pump (cut hole in floor, very easy to do honestly, can post pix if anyone needs)
-checked all lines to see if they were bent or clogged.
this process has taken forever. in the end, it would found to be this.
the fuel pump i purchased had a regulator ON THE PUMP (if you get a new pump check this!!! very important!!) and the fuel filter i purchased has a regulator in it (the one that costs over 100 has a reg in it, the 10-20$ ones do not). this was causing the issue. went to oriellys bought the filter from an 06 cobalt ss (as tim had suggested since they are the same, which they are BUT DO NOT LOOK THE SAME!!) installed the part. fuel pressure dropped from 85-95psi at the rail to jumping between 55-65psi at the rail. my tune is dog poop and i was using a cheap gauge that caused the jumping around. but, figured id post this up because it caused me a lot of wasted money and even more frustration.
