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Just had my LTs, y-pipe, and catback installed

This is a discussion on Just had my LTs, y-pipe, and catback installed within the External Engine forums, part of the LSx Technical Help Section category; Originally Posted by rajiv1998 Mine never ran good at WOT either. I doubt the missfire is due to the tune. ...

  1. #21
    Moderator 98TransAmWs-6's Avatar
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    Quote Originally Posted by rajiv1998 View Post
    Mine never ran good at WOT either. I doubt the missfire is due to the tune. Headers shouldnt change the A/F ratio, timing, spark etc... too much. People go months without tuning after LT install. This sounds like an internal problem. Pull out all your wires/plugs and make sure they are ok. Recheck all your ignition connections. Try to run a scan if you can. Go to 2 or 3 places and get it looked at (most are free) to make sure they are all pointing to the same thing.
    Well I'd like to try to figure it out first without having it scanned because where I live its $85 per scan. Even though I could just buy a scan tool myself for just a little more.

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    Senior Member Too Fast's Avatar
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    Quote Originally Posted by 98TransAmWs-6 View Post
    Another question, since I have a miss in cylinder 6, would my rough idle be related to that? I am pretty sure I already know the answer just wanting some comformation on it though.

    Yes, for sure.

    Quote Originally Posted by razer900 View Post
    any results yet? altho the plug may look allright, change it out and see what happens, if problem persists then swap plug wires with another cyl and see if the problem follows the wire
    And a +100 on this, this is how I isolate which cylinder has the misfire, and to see if it is spark/spark plug/fuel injector related or other. I swap the easiest thing from the suspect cylinder to an easy to access cylinder, and see if the misfire follows, or stays at the same cylinder. Process of elimination.

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    Senior Member rajiv1998's Avatar
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    Quote Originally Posted by 98TransAmWs-6 View Post
    Well I'd like to try to figure it out first without having it scanned because where I live its $85 per scan. Even though I could just buy a scan tool myself for just a little more.
    Do what we mentioned. Pull the wires and see if they are melted/damaged. And swap the plugs to differant places and see if it follows. If it does, you know its not a cylinder thats acting up, its just bad plugs.

    I never drove my car much after this happened. Didnt want to screw things up more. But if you must andits your dd, try and fix it fast. It shouldnt take you more than 1 hour max.
    "Life is to short to drive a slow car"

    Gone but not forgoten: 1998 Pontiac Trans Am M6 "The Black Bandit"
    Bought- 11-18-05
    Sold- 10-14-08

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    Senior Member INMY01TA's Avatar
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    Swap the #6 coil with another and see if the misfire follows.

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    Member JRENIGAR's Avatar
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    Quote Originally Posted by 98TransAmWs-6 View Post
    Well I'd like to try to figure it out first without having it scanned because where I live its $85 per scan. Even though I could just buy a scan tool myself for just a little more.
    Pickup a used predator for around 150 and that will tell ya evrything you need to know as far as codes and datalogging. I used mine for a tuner also till I got a frost tune but I still use it to datalog with, works great and clears codes too.... Just a thought.

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    Senior Member INMY01TA's Avatar
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    Autotap is more useful than a Predator.

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    Ok so I replaced the spark plug, switched wires around, and switched coils around, and so far I still get the code for a cylinder misfire. Any idea what might be wrong now? Also just to make sure I am doing the correct cylinder, if I am standing infront of the car cylinder 6 is the 3rd from the front on the passenger side right? I did some research and I found a site that said this can be caused by faulty o2 sensors, is that true cause my rear ones do need to be replaced. Also could this be caused by one of my fuel injectors? I would find that odd since all of these were fine before the install. Oh and also I scanned my car today and got another code p0174 too lean (bank 2) what exactly does that mean and how can it be fixed?
    Last edited by 98TransAmWs-6; 08-30-2010 at 08:59 PM.

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    Senior Member rajiv1998's Avatar
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    It shouldn't be the 02 sensor, but u never know. The other code isn't a big deal, a good tune should fix your A/F ratio. Just double check to see if none of the sensors or anything are broken. I don't think it's your injectors. People with cams are still on stock injectors, so I doubt it's due to a lack of fuel. Also what are the chances your injectors went bad right after a header swap? (if that's the issue).

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    I didn't think it was my injectors but I have no clue what the problem could be now.

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    Senior Member Too Fast's Avatar
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    Quote Originally Posted by 98TransAmWs-6 View Post
    Ok so I replaced the spark plug, switched wires around, and switched coils around, and so far I still get the code for a cylinder misfire. Any idea what might be wrong now? Also just to make sure I am doing the correct cylinder, if I am standing infront of the car cylinder 6 is the 3rd from the front on the passenger side right? I did some research and I found a site that said this can be caused by faulty o2 sensors, is that true cause my rear ones do need to be replaced. Also could this be caused by one of my fuel injectors? I would find that odd since all of these were fine before the install. Oh and also I scanned my car today and got another code p0174 too lean (bank 2) what exactly does that mean and how can it be fixed?
    But is the misfire code the same cylinder, or did it move to the cylinder you put the suspect plug/wire/coil to?

    And yes, , cylinders # 2,4,6,8 are on the passenger side.

    Have you checked your fuel pressure? (Should be 58-62, key on engine off with the 2 second prime.)

    Also, have you cleaned your MAF sensor?

    Usually fuel pressure/MAF problems would set codes for lean both banks, not just bank 2 tho.

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    Quote Originally Posted by Too Fast View Post
    But is the misfire code the same cylinder, or did it move to the cylinder you put the suspect plug/wire/coil to?

    And yes, , cylinders # 2,4,6,8 are on the passenger side.

    Have you checked your fuel pressure? (Should be 58-62, key on engine off with the 2 second prime.)

    Also, have you cleaned your MAF sensor?

    Usually fuel pressure/MAF problems would set codes for lean both banks, not just bank 2 tho.
    The problem stayed in cylinder 6. 2 codes pop up on the scanner for being too lean but it's the same code for being lean both in bank 2.
    Could the code p0174 be caused by a faulty o2 sensor? Otherwise I kinda Its weird how that code popped up after the header install since the headers shouldn't have changed the air to fuel ratio too much. No I haven't checked the fuel pressure. I am going to check my MAF and clean it.
    Last edited by 98TransAmWs-6; 08-31-2010 at 06:51 AM.

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    Senior Member Too Fast's Avatar
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    Any chance you over-revved the engine and bent a pushrod? That would cause a miss. Not a lean code, tho. I've never changed my O2 sensors, but some here have reported that they got dirty/skewed after a header install, due to an inside coating in the headers. That could cause the O2 sensors to report wrong, with a false lean code.

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    Senior Member rajiv1998's Avatar
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    Shouldnt you be able to hear a ticking sound if you bend a pushrod?

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    Senior Member Too Fast's Avatar
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    Yes usually.

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    The only sound I hear besides the miss is a rattling sound but that is just from the rough idle and it's my exhaust. I am going to try and replace my o2 sensors and fuel filtr tonight and see if that fixes it. If not I am at a total loss as to what's causing the codes.

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    Senior Member INMY01TA's Avatar
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    Bone stock MAF?

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    Yes except the screen was removed before I bought it. But it was fine before the the install so why would that cause problems now?

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    Quote Originally Posted by 98TransAmWs-6 View Post
    Yes except the screen was removed before I bought it. But it was fine before the the install so why would that cause problems now?

    Descreening the MAF will skew its output... not tremendously, but enough to alter fueling.

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    Quote Originally Posted by pajeff02 View Post
    Descreening the MAF will skew its output... not tremendously, but enough to alter fueling.
    Yes but why would it do it all of a suudden when its been that way for years? It may explain the lean but not the misfire or atleast I don't see how it would.

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    Senior Member rajiv1998's Avatar
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    If your MAF was de-screened prior to the header install and wasnt causing a problem, then I doubt thats the problem. Again, the A/F ratio shouldnt be off that much to throw is off. Change the fuel filter first. No point in changing parts if you dont know for sure. You could screw it up and be at a loss. Why dont you just do a compression test and see if there is actually anything wrong with the 6th cylinder. Each should be within 10% of each other. Doesnt really make sense to change the 02 sensors if you are not 100% sure thats the problem.

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