Problems with LT headers
Thread Starter
On The Tree
Joined: Jan 2008
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Problems with LT headers I have FLowtech lt headers and the first week the ses light turned ON, codes, P0300,1153,1133. I have read threads here and tried what people said and nothing has work, i changed my o2 sensors for bosh 13111 and the codes came on anyways. What should i do, turn them off or change the fuel injectors table by 15%??? Becuase my concern is that people havent decide what will happen if i turn the codes off, some said that it will go to open loop, others say it wont go to open loop.
Need the answer of of person that really know about this.
Thanks
Need the answer of of person that really know about this.
Thanks
You need to find out what is causing the misfire code.
You either have an engine problem causing a misfire, dumping fuel and fouling the O2's OR you have bad O2's giving the engine false readings and causing a misfire.
If you just installed headers I'd check the spark plugs and wires. I've replied to three people here in the past two weeks with random misfire/backfire problems after header installation. One was a cracked spark plug and the other two had wires burned against the headers.
You either have an engine problem causing a misfire, dumping fuel and fouling the O2's OR you have bad O2's giving the engine false readings and causing a misfire.
If you just installed headers I'd check the spark plugs and wires. I've replied to three people here in the past two weeks with random misfire/backfire problems after header installation. One was a cracked spark plug and the other two had wires burned against the headers.
Thread Starter
On The Tree
Joined: Jan 2008
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Ok, when i chaged the sensors, the misfire havent come again, but the other two 1153 and 1133 came again. Can i turn the codes off or should i take out the headers and put back the manifolds.
My concern is that i dont want to run on open loop because the mpg will be afected.
My concern is that i dont want to run on open loop because the mpg will be afected.
1153 and 1133 are insufficient switching codes. From my experience thats a problem with the sensors or connections.
I don't know what you've got there as far as other mods to the engine but I have my original O2's connected to my LT's with extensions and they switch fine.
Teching In
Joined: May 2007
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did you switch the o2s when you put the LTs on or did you run your old ones for a while? the reason i ask is because people have commented on how the inside coating of the LTs wears off a little and jacks up the o2 sensors.
Thread Starter
On The Tree
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I changed the O2 snesors this week and they switch fine for few minutes, then they went flat. So i cant turn them off because i will have bad mpg??? So the best thing will be to take the LT out right??
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Verdad Gallardo I would exchange the O2's for new ones. It sounds like you got a bad set.
Then with HPTuners on, start scanning before you start the car. See what the O2's do.
You should not need to put stock manifolds back on. You need front O2's to run the engine, so you can't turn them off.
Is there something special about this engine or car it's in? Anything else been done to it, parts? Tune?
Then with HPTuners on, start scanning before you start the car. See what the O2's do.
You should not need to put stock manifolds back on. You need front O2's to run the engine, so you can't turn them off.
Is there something special about this engine or car it's in? Anything else been done to it, parts? Tune?
Thread Starter
On The Tree
Joined: Jan 2008
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Yes i have SLP cold air intake, comp cams XR265HR (212/218 .522/.529 114), LT Headers and tuned with efilive. The sensors are brand new. But what is weird is that when i started the car (it was cold) the sensors switch perfectly as soon as i step on the gas a few time in the dyno, the sensors flat out (when the engine reach normal temp). So what is weird is that it doesnt look like if they wasnt receiving enough heat. They read right but does no switch. i have check cables and all and nothing is touching the engine and all cables are right. I check for the grounds, but what i dink is that if i have a bad ground they wouldnt function from start.
Please i need help because i want the car to run great.
Also what i thought it was to set the PCM to ignore dose codes.
Please i need help because i want the car to run great.
Also what i thought it was to set the PCM to ignore dose codes.
just turn the damn things off, they are pointless. and its not the sensors or connections. its from my experience from 4years of exhaust flow over the 02
I have had mine off for 4 years and my car is fine and runs fine
And thats all you did was remove the front O2's and tune the codes out, no further tuning for doing this?
Thread Starter
On The Tree
Joined: Jan 2008
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What you say is to set those codes off, but that the sensors will continue to do their job, to set the AFR.
That makes sense because i bought both sensor new from GM, and the codes again, then bought the Corvettes 13111 sensors and the same, i have waste a lot of money in damm sensors.
Will the car run in open loop and will the mpg will be affected? I will get the car tuned again the same day the guy will turn the codes off.
And another question. If the car runs in open loop the only thing it changes is the AFR??? Because if a have a wideband i can check that right??
That makes sense because i bought both sensor new from GM, and the codes again, then bought the Corvettes 13111 sensors and the same, i have waste a lot of money in damm sensors.
Will the car run in open loop and will the mpg will be affected? I will get the car tuned again the same day the guy will turn the codes off.
And another question. If the car runs in open loop the only thing it changes is the AFR??? Because if a have a wideband i can check that right??
turn the 1133 and 1153 codes off.
sensors are still in and work fine.
I did not say I removed anything.
when you turn these codes off this DOES NOT mean the 02s are turned off, JUST THOSE CODES ARE OFF
The problem is heat the 02 are not staying hot enough. I have fix the problem by moving the 02 bung closer to the collector. I also had a budy just wrap his headers and the code went away.