Ok ive been driving mty car on the weekends and it has been driving great........80+ degrees outside no problem.
SO i decided to take my car in for service today, just to mess w/ it cause its slow.
well the temp was in the low 50's high 40's.....and it ran terrible, It warmed up fine and when i went to drive it it fell on its face when it got into boost. I mean multiple random missfires and all. It drives fine outta boost, but as soon as you hit boost it tries to and will hit 10 psi but there is something wrong. Fuel pressure is fine and tank level is almost full. And yes its 93 octane.
Any opinions?
my car loves the cold. sometimes i'll even see a little extra boost
no idea what the problem with yours could be though.
Any codes aside from random missfire codes?
My car loved it.....
Like BLWN L61 said, I sometimes got an extra pound of boost or so.
im not sure on other codes, i only knew it was the random misfire by the blinking CEL
ill check codes here in a bit
are you on the gm tune or a personal hpt tune?
im on the gm tune
codes are as follows:
p0303.............cylinder 3 misfire
p0171.............system too lean
p0172.............system to rich
im kinda stumped
Is an injector not opening properly?
How does it drive when it's warmer outside? Like, mid afternoon.
yea I had a similar issue after my swap i just completed this weekend. I was getting a nasty misfire on initial start up, throwing codes for injector 3 and 4 not firing and all types of bs. went thru compression checks and everything....the whole nine. Came down to it being my pcm went bad, but in your case First thing Id check would be to take injector 3 out and see if it is working. You can find a injector pulse tool fairly easy maybe even a local shop will give it a go for you. If the injector is indeed firing Next thing I would do would be to check the harness to make sure a wire isn't pinched or anything.
Also the po172 is fairly common with the 2.2. I use to throw it fairly often with my hpt file.
Hmmm....mine loves cold weather! Like a few have said, I see an extra pound of boost when it's 45 or cooler!
I have always had a random misfire CEL though...every 5 cycles it comes on, stays for 10 cycles and then goes out? Never figure it out!
I had the stumble problem early on with my SC but it's not done that in about a year.
Eh...old man with a Corvette now...it was bound to happen sooner rather than later right?
I am highly upset that I can't access the s/c tune in hpt. I have a feeling alot of these issues are due to the fact that alot of cars from factor vary with a few variables. A few variables are enough to throw cars off fairly easy. For example not all cars have the same Injector Constant from factor even though they use the same injectors and what not. Now if gm is using one base tune for every car that get the reflash thats going to throw some cars off a bit. I know when my injector constant is off the car runs completely different.
colleens loves the cold also , as did my 2.4
i really do think GM did a horrid job on the fueling for the eco s/c , my 2.4 never had any hick ups , and hers from time to time does weird things
someone really needs to hack the gm program , or gm needs to pull their heads out and redo it
K. Vega,Now With Vitamin Boost wrote:Ialot of cars from factor vary with a few variables. A few variables are enough to throw cars off fairly easy.
This is what I've come to believe...no two Cavys are running the same variables and the "one size fits all" tune GM did for the SC is not as good as it could have been...granted they made sure it was rich as a pig to save replacement cost but that has caused issues with some Ecos due to the differences in the stock tune.
I know that is my problem...I see 14:7 or so at idle (sometimes a little higher or lower), 13:5 - 14:5 at cruise and then 10:5 at WOT. My wideband only goes to 16:0 so I'd say I'm good decceleration as well.
It's a problem but until someone cracks that program...not much we can do other than buy a new PCM and use HPT from the start.
Eh...old man with a Corvette now...it was bound to happen sooner rather than later right?
I had this issue with the oem plugs and even the srt4 plugs. Got the plugs Suncavi recommended and the problem was solved.
Phlatcav wrote:I had this issue with the oem plugs and even the srt4 plugs. Got the plugs Suncavi recommended and the problem was solved.
I'll have to back up this claim...now that I think about it I can't recall having this problem since I swapped plugs. Gapped at .32
Eh...old man with a Corvette now...it was bound to happen sooner rather than later right?
all he injectors tested fine...
ill have to check the plugs..i have champion stage 2 for the srt4
do you have a wideband hooked up currently?
Mine does the same thing once in awhile when its cold, all i do is shut the car off and start it again and it goes away. I cant wait till next year when I switch to a new computer and get a really good tune.
yes wideband is hooked up correctly.
im starting to think its the tensioner gone bad. cause undeneath the car i can pull down on the belt between the a/c compressor and crank pulley and completely compress the tensioner. If i use the wrench on the top its a pain. the belt was really sqeaking thismorning so im gonna lookinto that,
Well, mine's been fine since August...until now...It's been acting up the last 2 days, but it's hard to explain. It's been about -20c here and it seems like the car is misfiring while cruising or on slight acceleration and i can feel the motor banging around under the hood like crazy when it does. What plugs did you guys switch to? I was thinking that's what it might have been.
TraJadY wrote:Well, mine's been fine since August...until now...It's been acting up the last 2 days, but it's hard to explain. It's been about -20c here and it seems like the car is misfiring while cruising or on slight acceleration and i can feel the motor banging around under the hood like crazy when it does. What plugs did you guys switch to? I was thinking that's what it might have been.
Your problem sounds like an O2 sensor(s) issue. You may could perform an injector flush, but my recommendation to you is to consider replacing your O2 sensor(s). I can't guarantee anything, but it sounds like your O2 sensor(s) are switching slowly when at light throttle angles and when you slightly ease into the throttle. I recommend factory GM O2 sensor(s). This may be a lot more expensive than a local parts store, but will definitely be the correct part. If you didn't want to get a GM part, then go to either Carquest or Orielly's Auto Parts.
Again, I can't guarantee anything, and I wish you luck with making your car perform better.
i figured out my problem. it was a dumb one
my fuel level sensor went bad w/out my knowing and when this happended i had almost an empty tank+ walbro = bad
