Thread: Car sputters when trying to boost

Said Bill...not Dan lol

He said bill and dsm so I thought he meant me

Ahhhhh gotcha. Maybe.

Probably I am probably the most awesome person I know

lol yeah you are dsm.

so problem went away for about 3 days of driving after swapping components to try to find which was bad by chasing the misfire

figured it was lose connection

today after about an hour or so of driving the misfire returned and its on the same cylinder....

went out and heat wrapped all my wires thinking the heat may have attributed to it and saw my IAT had become unharnessed from intake and was hanging

so I finished my intake finally and opened a hole big enough to get the iat back into intake and wrapped the rest of the wire in heat wrap

someone had said some of the fuel ratios are adjusted by iat and I'm wondering if that could have been my problem all along I'm told cylinder 3 and 5 run the leanest
and have presented problems pre tuning because of it.

whats a crank relearn normally cost?
does it have to be done at a GM dealership?
is there anyway of scanning to see if it is off at all?

maybe the problem is multipled by the colder plugs and faulty Iat temps?

not sure which way to go with it at this point gonna take another drive after it cools down a little bit but any help either chasing or fixing the problem would be appreciated

The iat unhooked or just fall out of the intake?

have the icm tested like we talked about in the chat.

nah it was still on harness just hangin from wire basically I got it put back in now

(Josh/iceman scared me with a chipped piston diagnosis)
had the compression test done I was getting 170+ at all front cylinders

leaning towards the coil pack now I had replaced one of the packs previously so I'm going to swap two and if its still boggin

I think I got my culprit in the ICM

Went for a drive after swapping have not gotten to check the code as phone is dead but it was still shooting me a couple misfires not nearly as bad as it was before and and not as rough around 25-30 rpm

I just wanted to ask if it was a case relearn that needed to be done would it only be acting up at the higher rpms like it is?

gonna head to JY and grab a new ICM see how it treats me but after that I stumped

If none of that stuff fixes it swap your fuel injector to another cylinder.

i think hes moved everything already,(plug wire and injector) hes got the icm on the list now.

Swapped coil packs and went for a drive to make sure it was ICM and had not replaced a bad pack with another bad pack. and the problem dissipated again..

I'm starting to think I have a loose connection somewhere.

and than came back after the car had warmed up it seems like when it would go to WOT it just chokes im wondering if my fuel pump might be suspect at this point cause im no longer getting thrown the misfire code

this is right after I swapped the ICM . Whats ****ed it the whole ride to the JY she was running beautiful Open throttle

everything idles fine and its not throwing me a code for any misfires also my KR is only reading .7

the newest three videos are all of this recent problem just showing it idle start and drive fine....until the car tries to boost

its hard to tell in video but the sound only occurs when its being gassed the momentary breaks are me letting off it

Any chance this is knock retard and just need to be tuned out?

http://www.grandprixforums.net/help-...e-2-45754.html

dbl checking all my plugs are gauged properly again..

So what all have you replaced so far to try and fix it?

ok so list as is

Re gauged spark plugs twice from 58 to 50 ngk tr6 = one heat range cooler

was getting cylinder 3 misfire swapped wire misfire code on same cylinder

swapped out coil pack moved spark plug wire and injector to different cylinders(trying to trace component failure)
code stopped sputtering continued sparatically

swapped ICM = sputtering became more apparent but still no code

read previous thread regauged spark plugs all down to 50 and unplugged battery to set pcm to relearn
let idle 15-20 min

drove fine wot and in between for an hour or so
picked up date went to bar left en route home sputtering presented itself less dominant than in video but was there at WOT only
also shot me a code but phone was dead so will have to check in the morning

gonna regauge plugs in the morning down to 45

the drop in heat range was for 3.4 pulley waiting on install for tune

seems like the plugs are the culprit as the condition seemed alot better after regauging but still gonna try to clean my MAF off just in case its having faults

gapping them at .05 should be fine. Did you make sure all the injectors are plugged in completely?

am I disylexic and .50 was actually .05?

or are you saying I can gap them at next to nothing?

yeah all the injectors were good I'd plug in the front make sure I hear a click and than loosely tighten bolts than click the rears in and tighten them all down in
a cross fashion like you would lug nuts.

so last night I got a blinking SES light en route home figured when I went out today it would give me another cylinder misfire....no codes stored....
also have had my cylinder 3 misfire counter added to realtime display and am not getting any misfire out of it or reading any
also after re gauging plugs my gas mileage went up about 1mpg

you want .50 its not a small gap.

true...