when i try to get on (50% to100% throttle)my car in second gear at high rpm(4200-6000)rpms it starts to spunder and surge. i called my buddy who tunes my car and we found out that im leaning out up top.so we tried richening up the top end didn't work still does it so we added even more fuel and it didn't work. we think i have a
1.clogged injector
2. clogged fuel filter
3.blow-by-god (i hope not)

im going to be doing a compression test sometime this week. are there any thoughts

*** before we hooked hptuner i checked my plugs think it was an electrical problem but they were fine

 

How'd you figure out you were leaning out? Plugs, coil packs and maf will all cause studdering up top and under boost. Of course so will the things you mentioned. Sounds like you're on the right track.

 

we checked my air /fuel table also before my wideband would hit 11s now lowest it goes is 12
the plus are fine they are gaped to 32 they are the ngk two step colder
how could i check the coils?

here are my mods if that helps
2.7 zzp pulley
60lbs injectors
k&n typhoon cia
hp tuner tune
hurst short throw shifter
aem wideband
aero interceptor
ais alky injection- unplugged for now
mildly ported blower
drilled and sloted rotors
cobalt -addiction 3inch downpipe w/o cat
whisper resonator
magnaflow muffler 3inch exhaust

 

First give them a visual inspection to make sure none are bloated, and there are no cracks in the boot at the bottom. When that checks out pull a coil pack, keep it plugged in, throw a plug in it, ground the tip and have a friend turn the car over. You should be able to see it. SS/SC's aren't known for finicky coil packs but it's a possibility, with your car being an 05 I'd check it out. But coil packs won't cause a lean condition. I'd keep trouble shooting the fuel system first in your situation though.

Was your tune adjusted for the meth injection being removed?

 

i have the ais trunk mount stage one havent be able to tune it with hptuner cause this just started. i cant do wot pulls t tune the meth

 

It sounds like you're getting good advice from your friend so far, keep on the fuel system until you rule it out and then look at the MAF if that doesn't cure your ills.

 

well im going to change my fuel filter i havent changed it and i have 36000

 

bump

 

bump

 

i had that problem with my car aswell....i talkd to the guy who tuned my car an he said thats how the 60# react to our cars....but now theres a whole write up somewhere on the site from someone who got around the 60# studder problem from the injectors...if i find the link ill post it for you

 

like 2 weeks ago I was having like a surge or a sputter I could feel from 5K to 7K at WOT. I put new plugs in and it runs great again. The BKR7E's really don't last to long.

 

sorry my error that write up was for an idealing problem =/

 

should i buy new injectors, my plugs are fine

 

not 100% sure if you need new ones the 60s are fine if you can deal with the studder...but if not then try an find bigger injectors...i have no clue who makes them bout i think...not 100%sure but i think there like 70 or 80# injectors but ask around about that tho

 

why would i need bigger injector i havent maxed out the 60

 

i know but thats how the 60s react to our cars... a few ppl already had this problem an they just kinda deal with it but someone went to a bigger injector an was fine....im just trying to give you advice on whats happening you know an as i stated about the bigger injectors i wasnt 100% about it

 

I think you might need a new tuner that knows how to tune a correct injector offset table or workable PE enabling qualifiers.
If your injectors are failing you'll notice a sharp lean bump on the narrowband on your scan log during wide open throttle if one is clogged or is shot, or a really dark spark plug if its stuck open.

If a coil is bad, you'll get a misfire usually as soon as you crack the throttle that you'll feel even when not wide open.

 

my tuner knows what hes doing



there are no sharp lean bumps on the log

 

could it be an air fuel problem? dk if he has an wideband to tune that right as well?
edit nvm he has a wideband just read his mods again

 

I quoted the guy above you about the tuner.

I think SJSchafer has a thread about tuning injector offsets.

 

do you have the link..



anyone know where i can buy 72 lb injectors

bump anyone got any ideas

 

Make sure your fuel rail is tightly bolted down. Last time I had the rail out I screwed the bolts in, but did not tighten as soon as I went above 50% car sputtered and lost power.

 

checked it thats fine. i hooked my methanol back up and the car doesnt do it till closer to redline

 

so my friend at chevy did a compression test and that came out fine

 

bump leaning towards injectors maybe a clogged one