Misfire on LNF
04-25-2009, 10:38 PM
#1
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Misfire on LNF
Is anybody having problems with misfires with the LNF if you do a NLS? I got 5 codes at once today, and then the car didn't want to stop misfiring afterwords...... Help please.
04-26-2009, 06:00 PM
#3
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my car is running like **** too.
I have a cel for low voltage on the maf sensor, the car runs like **** when you first start it but once it runs for a minute it levels out.
I'm going to have to put my stock intake back in and get retuned before I can get it serviced
I have a cel for low voltage on the maf sensor, the car runs like **** when you first start it but once it runs for a minute it levels out.
I'm going to have to put my stock intake back in and get retuned before I can get it serviced
04-27-2009, 02:05 PM
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yup i just cleared the codes again last night, Idk if its from the NLS or what but the codes come up twice, and they are a misfire in 1-4? I never really payed attention to when they pop up, i'll see if they do when I do a few nls or w/e. Anyone else having this go on? Sometimes i notice a lil rought idle but it isnt anything that doesnt level out after a few secs or after u bump the gas.
04-27-2009, 04:49 PM
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Well it turns out mine is thr map sensor and i have misfires too.
Just called the dealership.. the part is on national back order so it will be a week or so before I can get the part!
Just called the dealership.. the part is on national back order so it will be a week or so before I can get the part!
Last edited by proZak; 04-27-2009 at 05:53 PM.
04-28-2009, 11:22 AM
#6
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the idle is high for a minute or two then it levels out once it gets up to temp... it was misfiring on 3&4, then mutliple / random misfires... it had a total of 5 codes the last time I cleared them.
11-25-2009, 12:27 AM
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I am have the same issue. My car is tuned (06Black) and a full exhaust. Just recently my CEL came on. Pushed the OnStar button and had them run a test. Came back misfires in all 4 cylinders.
Changed the plugs today and hooked it up to HPTuners and scanned as we started the car and let it run its cold start high idle. When the coolant temp reach 90, it started misfiring like crazy but the car run perfect. The car continues to run perfect threw normal driving and even at WOT. No misfire or knock of any kind noted on HPTuners. Only occurs when I start the car while cold.
Can someone give me some help!
11-25-2009, 08:06 AM
#12
rear brakes are nothing...
are you getting the miss fire after you nls or just driving?
I may not be a major issue, if you dont nsl correctly it cel's. Ive had my car cel/limp mode like 8 times for sure because I didnt nls perfect...meh drives great still.
are you getting the miss fire after you nls or just driving?
I may not be a major issue, if you dont nsl correctly it cel's. Ive had my car cel/limp mode like 8 times for sure because I didnt nls perfect...meh drives great still.
11-25-2009, 03:52 PM
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Misfires occur ONLY at start up. Car acts and drives fine. 06Black put a stock tune back on and he seems to think that fixed the issue. And we will just have to start retuning from there.
11-25-2009, 03:58 PM
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11-25-2009, 04:29 PM
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The car felt very slow compared to when it was tuned. But no check engine light or anything. Probably just going to leave it stock tuned for the winter, should be easier to drive w/ less power.
11-25-2009, 04:38 PM
#18
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I've done it once. I pulled over, popped the hood for a sec, let it cool off, started it up...and went on my way. I messed up a NLS so it was my fault. And I pushed her hard that night. She was letting me know to stop being a dick. :P
11-25-2009, 04:56 PM
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iv been getting random misfires in all cylinders in higher gears, 4th 5th, under normal every day driving. light acceleration sometimes and it stutteres and shakes untill i let off the gas, then it behaves normally again untill another 15 miles or so when it wants to do it again. dealer replaced my ECU, picked it up today, will see if thats the problem
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