pacesetter LT install.. car = slower and boggy
pacesetter LT install.. car = slower and boggy ok after 7 hours w/ alot of help from 2 of my friends.. the long tubes are installed.. y-pipe is on.. everything is bolted up tight.
car runs like crap now though.. seems slower then before.. also every single time i had to roll out from a light tonight.. car bogs, rattles(i assume the y-pipe), and rpms build up to normal..
I had the car LS1 edit dyno tuned by MTi before the headers.. i think they removed all the EGR checks..
2 things i think it might be..
rear '02 sensors are plugged in.. these are race style headers.. so the plug right there the cats use to be.
the front '02 sensors are not plugged in.. their just zip tied up. Or..
that the Y-pipe where it meets the header is right against the bottom of there car.. its just the way the headers hang.. their right up against the car almost touching.. maybe vibration causing a false knock? what would be good to put in there to keep it from rattling?
car does throw a Service engine soon light.
car runs like crap now though.. seems slower then before.. also every single time i had to roll out from a light tonight.. car bogs, rattles(i assume the y-pipe), and rpms build up to normal..
I had the car LS1 edit dyno tuned by MTi before the headers.. i think they removed all the EGR checks..
2 things i think it might be..
rear '02 sensors are plugged in.. these are race style headers.. so the plug right there the cats use to be.
the front '02 sensors are not plugged in.. their just zip tied up. Or..
that the Y-pipe where it meets the header is right against the bottom of there car.. its just the way the headers hang.. their right up against the car almost touching.. maybe vibration causing a false knock? what would be good to put in there to keep it from rattling?
car does throw a Service engine soon light.
TECH Enthusiast
Joined: Aug 2002
Posts: 612
Likes: 0
From: Northside Rocktown, AR
I had mine installed last week and i definately noticed a big increase in power. i had banging problems too but i had a custom y made but i fixed the banging. As far as loss of power i know my car at WOT was showing very little knock and i was running slightly rich, Ltrims were good and everything was basically fine, were going to dyno tune it after my gear install and im sure i picked up atleast 20-25 Hp with the LT's and !cats.
TECH Apprentice
Joined: Aug 2003
Posts: 335
Likes: 0
From: Vacaville, CA
check my post on this same subject. Im not quite sure what you did with your o2 sensors, but you need to get extensions and plug the front sensors that came out of your old manifolds into the collectors of your headers, and you need to get sims and plug them in the place of the 2 rear o2 sensors in the y-pipe.
If I'm reading this right you don't have your front 02's reading your exhaust?? If that's the case I would think that's 100% of your problem. Worry about the false knock after you get your 02's working.
WARNING: BAD TRADER STATUS
Joined: Dec 2003
Posts: 250
Likes: 0
From: California
I agree your front o2's are the problem. The reason why your car is running like that is because the o2's are telling you car to run REALLY RICH. You need to get the o2 simulators. Two sets will cost you about $180. You cant have the o2's plugged in and just hanging there. You can also use ls1 edit and delet the 02's. When you diagnose it you will see that your car is running way too rich from the confusment of the o2's.
They pretty much said it all. With the purchase of a long tube header, you need O2 sensor extensions so that your front O2 wires can reach and be functional. Most people are running O2 simulators for the rear O2's to keep from throwing the SES light that occurs when running an Off-road Y-pipe.
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Yea your O2's are the first problem. With mine I have an exhaust leak on either the headers or EGR/AIR tubes since some smoke is coming out of my engine bay and mine won't idle for longer then 2mins. I have yet to drive it, but when I reved it seemed to lose power. Damn leaks 
Originally Posted by TWISTA TA
I agree your front o2's are the problem. The reason why your car is running like that is because the o2's are telling you car to run REALLY RICH. You need to get the o2 simulators. Two sets will cost you about $180. You cant have the o2's plugged in and just hanging there. You can also use ls1 edit and delet the 02's. When you diagnose it you will see that your car is running way too rich from the confusment of the o2's.
Horrible advice, don't listen to it. DO NOT run O2 sims up front, you want them in the rear only. The front sims do all the real work, running sims up there is the last thing you want. Pay 90 for the rear sims and zip tie them up, then plug in your front 02s. This will fix your problem indefinately.
Rob
Originally Posted by BAD *** TA WS6
Horrible advice, don't listen to it. DO NOT run O2 sims up front, you want them in the rear only. The front sims do all the real work, running sims up there is the last thing you want. Pay 90 for the rear sims and zip tie them up, then plug in your front 02s. This will fix your problem indefinately.
Rob
Originally Posted by Dave Carney
you didn't plug in the front o2's....you should delete this thread, change your user name, and pray for forgiveness.
i knew exactly that was his problem the minute i read that line. 
Why are people telling him to get 02 simms, he had his car tuned by MTI, if they didnt already remove those rear 02 sensor checks from the computer they certainly should with no extra charge I would think. Either way yes the front 02 sensors must be plugged in and reading the exhaust stream or the car will not run worth a crap. If I paid for an MTI tune I damn sure wouldnt be buying 02 simms to remove something they could remove with a few keystrokes.
exactly, strippedLS1
take the PCM to MTI and have them turn off the REAR O2's
plug your fronts back in the headers (with O2 extensions or extend your own)
then you'll be fine.
without your front O2 sensors the computer is in "autistic mode"
take the PCM to MTI and have them turn off the REAR O2's
plug your fronts back in the headers (with O2 extensions or extend your own)
then you'll be fine.
without your front O2 sensors the computer is in "autistic mode"
problems fixed, SES lights off.. just had to use pacesetters ghetto 'extension kit' its litterly 1 thing of wire wrapped up, some wire chrimps, and wire cover.
other then the y-pipe banging i think its runnin alot better. sorry for the dumb question, appreciate the help.
other then the y-pipe banging i think its runnin alot better. sorry for the dumb question, appreciate the help.
STF Veteran
Joined: Oct 2003
Posts: 3,486
Likes: 0
From: Greensboro, North Carolina
Remember there are no stupid questions just stupid people who ask them. 
Just kidding! To me it wasn't a dumb question because I learned also. I didn't know that the front O2 sensors where so important. Now knowing that I went ahead and ordered the O2 extensions with my headers. Thanks for taking the heat for someone else. 
Just kidding! To me it wasn't a dumb question because I learned also. I didn't know that the front O2 sensors where so important. Now knowing that I went ahead and ordered the O2 extensions with my headers. Thanks for taking the heat for someone else.