Bogging at full throttle after headers

I just put headers on my car this week and got all of the mufflers piped up, when i went to drive it today i started noticing that at 75-100 precent throttle it would bog almost completely cutting out then fire again and accelerate as normal. Is this just the computer learning the new system or do i have a problem? i have driven it less than a mile because i didnt want to do any harm to it. Also i hooked up all the egr as it should be so i dont believe its that. I know i will need a tune but it shouldnt bog like that even without one.

You need to look over everything again.

You might have missed a connection some where. Check your O2 sensors make sure you have them connected to the right connectors (front).

Did you take anything else off or disconnect anything besides the spark plug wires, plugs, O2 sensors?

Most ppl delete the EGR and Air Pump systems when they install headers. Any reason you re-installed yours?



It almost sounds like the MAF needs cleaning.




I drove mine 8 months before I got a tune and had no issues except the check engine light

bogging makes it sound to rich.............could it be to lean instead????

Quote:

---

Originally Posted by sjsingle1

bogging makes it sound to rich.............could it be to lean instead????

---

You thinking an air leak near the O2 right?

it smells like its running rich. and the o2s are connected correctly. i guess i just need to drive it some more to narrow it down

Quote:

---

Originally Posted by sjsingle1

bogging makes it sound to rich.............could it be to lean instead????

---

could it be running that rich to make it bog?

Does it feel like its missing as well or just bogging? When i install my headers back in the day on my 01 i didnt get the far back passenger side spark plug wire on all the way.

I thought I read somewhere that if you didn't get the rear O2's deleted in a tune that the ECM would read that the cats were overheating (assuming you deleted the cats) and dump a shit load of gas to try and cool them down.

Dan

Quote:

---

Originally Posted by whitetrashbird

I thought I read somewhere that if you didn't get the rear O2's deleted in a tune that the ECM would read that the cats were overheating (assuming you deleted the cats) and dump a shit load of gas to try and cool them down.

Dan

---

went with high flow cats could be the same problem maybe?

Quote:

---

Originally Posted by 1slowbusa

Does it feel like its missing as well or just bogging? When i install my headers back in the day on my 01 i didnt get the far back passenger side spark plug wire on all the way.

---

its not missing because after it bogs its full power

Quote:

---

Originally Posted by davidz28

its not missing because after it bogs its full power

---

So it's actually more like a stumble? Your rear O2s will have no effect on how your car runs. The front ones will. Did you install O2 extensions, or the full length Bosch ones?

Quote:

---

Originally Posted by Knight

So it's actually more like a stumble? Your rear O2s will have no effect on how your car runs. The front ones will. Did you install O2 extensions, or the full length Bosch ones?

---

i cut each of the 4 wires and extended them.
and yes its like a stumble it will start accelerating totally back off to no throttle or noise then very harshly pick back up. it chripped the tires in second doing this several times.

Quote:

---

Originally Posted by davidz28

i cut each of the 4 wires and extended them.
and yes its like a stumble it will start accelerating totally back off to no throttle or noise then very harshly pick back up. it chripped the tires in second doing this several times.

---

Bingo, Houston We found the problem! I bet they are not reading right.

Quote:

---

Originally Posted by SMWS6TA

Bingo, Houston We found the problem! I bet they are not reading right.

---

Agree. Pop for the Bosch 13111's. It'll save you a lot of headaches.

Quote:

---

Originally Posted by Knight

Agree. Pop for the Bosch 13111's. It'll save you a lot of headaches.

---

I think he's going to have an issue with that is he cut before the original harness to make the extensions.

Quote:

---

Originally Posted by SMWS6TA

Bingo, Houston We found the problem! I bet they are not reading right.

---

+2.. Had this happen personally on another one of my cars.. Thought I would reroute it..

Oops should'nt have cut the pig tail..:sillyme:

Had to do new pinouts to correct it..

Quote:

---

Originally Posted by SMWS6TA

I think he's going to have an issue with that is he cut before the original harness to make the extensions.

---

I was thinking he may have cut them after the connectors. But if he cut them before the connectors, you would be correct.

how do those O2's work that splicing in extra wire would cause them to read bad?

Quote:

---

Originally Posted by davidz28

how do those O2's work that splicing in extra wire would cause them to read bad?

---

Its the splicing that can cause the problem. The PCM not reading the correct readings/ohms/or voltage. It could be because of the wire or the connections themselves. Some have been able to make it work, but I've read more ppl have had to go back and fix it and then get the extensions.


OP did you cut before or after?

Before means the wire harness connection. After means the connection that connects to the O2. Can't remember which one is the male or female. I think the male is the O2 side.

If you did after then you are lucky in doing so and all you have to do is get Bosch 13111 O2s.

You will never match the exact resistance required for the O2's to operate correctly with a splice and extra wire. Doesn't matter where the splice occurs.

You are not seeing 'full power' as you say you are after the bog. You are seeing a lowered amount because the PCM is seeing distorted readings from the O2 sensors.
The bog is created from being WAY too rich. Kinda like 'safe mode' for Windows.

I cut after just on the O2 plug side so i can get new ones. Mr. Lous thanks for the input that explains my problem, i think im just going to go ahead and get a frost tune and get them tuned out instead of buying extensions.

Quote:

---

Originally Posted by davidz28

I cut after just on the O2 plug side so i can get new ones. Mr. Lous thanks for the input that explains my problem, i think im just going to go ahead and get a frost tune and get them tuned out instead of buying extensions.

---

You can not tune out the front O2s - they are required to make sure the car runs with the proper air/fuel ratio. You can only tune out the rear O2s. You will need to replace the front ones.

Quote:

---

Originally Posted by davidz28

I cut after just on the O2 plug side so i can get new ones. Mr. Lous thanks for the input that explains my problem, i think im just going to go ahead and get a frost tune and get them tuned out instead of buying extensions.

---

You got lucky then for doing it after.


Read THIS BELOW
VVVVVV

Quote:

---

Originally Posted by Knight

You can not tune out the front O2s - they are required to make sure the car runs with the proper air/fuel ratio. You can only tune out the rear O2s. You will need to replace the front ones.

---

Frost will tell you this too.

Your best bet is to get Bosch 13111 O2s. They are longer and will give you plenty of length to reach the new locations.

They go for about $75-$85. The wire extensions go for about $30-$40.

Quote:

---

Originally Posted by SMWS6TA

Your best bet is to get Bosch 13111 O2s.

---

I agree with why, but there are some people that have problems with those O2's. Inactivity/not properly switching codes.

Quote:

---

Originally Posted by Mr. Luos

I agree with why, but there are some people that have problems with those O2's. Inactivity/not properly switching codes.

---

Could that be a yr of the PCM problem? Meaning ex. 95'-98' LS1's have one type of PCM, 99'-00' have another, and the 01'-02's have another.



Wonder if Frost knows why.

Could be. I have seen it happen with a 2002 Z28. Heard about it with other years, but never seen it personally.

seems like ive heard you can get corvette O2's that are long enough and work is this true?

Quote:

---

Originally Posted by davidz28

seems like ive heard you can get corvette O2's that are long enough and work is this true?

---

The 13111's are a Corvette sensor. My question is, they're listed as a REAR O2 sensor for the Corvette, ya'll are saying they'll work fine as a replacement for the front O2's on our cars? Doing the header install in the near future and definitely want to just swap the sensors out and avoid any problems I may have.

Dan

Quote:

---

Originally Posted by whitetrashbird

The 13111's are a Corvette sensor. My question is, they're listed as a REAR O2 sensor for the Corvette, ya'll are saying they'll work fine as a replacement for the front O2's on our cars? Doing the header install in the near future and definitely want to just swap the sensors out and avoid any problems I may have.

Dan

---

:yup: You can use them as replacements for your front O2's. I have them on mine, as do many others. No problems at all.

Knight is correct. O2 sensors report the same information to the PCM. The PCM interpets the data differently based on its position (front or rear) and then the PCM makes adjustments accordingly. The only two important O2 sensors are the front. When you get LT's and a tune you end up tuning the rear ones out.

Awesome info guys I appreciate it. Always like to find these things out BEFORE undertaking a project so as to avoid any problems as I am an old wrench turner but a complete newb when it comes to messing with the LS1.

Dan

Quote:

---

Originally Posted by whitetrashbird

Awesome info guys I appreciate it. Always like to find these things out BEFORE undertaking a project so as to avoid any problems as I am an old wrench turner but a complete newb when it comes to messing with the LS1.

Dan

---

:cheers:

We all had to learn at some point. Best way is to ask questions.