Ok well im running the mods in my sig and today i put the downpipe on after driving for awhile my check engine light started flashing. Also after installing my downpipe my af was everywhere now it goes to 13 and drops to 10.5 and im throwing codes for a misfire in cylinder for 3 and 4. now i how would i go about fixing this issue is just started to happen after installing the downpipe

 

Are there any exhaust leaks? Did the metal gasket ring stay in the O2 housing exit flange while you installed the downpipe?

If there are no exhaust leaks and no damaged wiring, I would unhook the ECM for 20 minutes and then hook it back up and start the car.

 

that and dont you have to tune for it?

 

how would i check for an exhaust leak?

I have a trifecta tune for it

 

How many miles on the plugs/what kind of plugs?

You can check for leaks with soapy water in a water bottle, spray the flanges you played with.

Or feel around the flanges(not touch them) to see if you can feel exhaust coming out.

 

only 8500 on my car and it has stock plugs

also the rear 02 sensor isnt plug it idk if that matters

 

Well not for a misfiring CEL.

Plugs should be ok.

I know this may sound retarded, but did you let the car warm up before you started to romp on it?

LNFs DO NOT like to be anything less than fully warmed up

Try unplugging the battery for 20 minutes as Matt M said as well.

 

cause i ran the check for codes with my trifecta program and it showed 3 codes 1 for a misfire then 2 more for a misfire in cylinders 2 and 3 and yes the car was fully warmedu p to about 189 before i actually got on it at all...Isnt the battery located in the trunk how would i unhook it then. or how would i remove my ecm

 

Have you been tuned for the dp? The codes could be causing the af to go off because of the exhaust O2 readings. The absense of cats can make your car think it is running shitty.

 

Lift up the mat in the trunk the battery is under it. Disconnect it and let it sit for a while. It will clear the codes. I had a cyl 3 misfire and cleared it the same way.

 

guess ill try this in the morning ill unplug my battery for 20 and hook it back up and check for the codes but what if my af is still all over the place i know one of my friends blew his engine with misfire codes on his car and im tryin to fix this before my car explodes and im fucked cause im pretty sure i voided my warrenty with dp and charge piping

 

Dude just unplug it now. It wont kill it to sit overnight.

 

you can take your dp and chargepiping off before you go to the dealer.Are you tuned for your BOV? Datalog again and send it to Vince.But first I would change your plugs.New stockers are preferred

 

i dont have the stock charge piping it smacked against the engine and cracked it when i boosted one time and i had to leave to go to my new base so i didnt have time to get the new part at home and now they dont have the part here so i had to use my friends old dejon piping

also if i had to get new plugs where would i get them from? if i go to the dealership would they replace them for free if im under warrenty

 

Why isn't your rear 02 sensor plugged in?Does ZZP not have a bug for it?

 

They have them but you gotta pay 40 for a dp with one on it and i just misread and thought that it came with one like the mpx one does but i was wrong

 

That's weird. The O2 is an important emission control that helps control fuel injection on newer cars. My 02 S-10 had a bad O2 sensor and it threw it into limp mode and the engine was running more rich than Bill Gates. See if they will take it back and get you one with an O2 bung in it.

 

My guess is that's your problem

 

i doubt they would take it back now since i already used it

 

Yea well it never hurts to ask. I would toss on the stocker and see if that helps. Unplugg the battery when you do it to clear the code. I wouldn't drive it til you get the O2 sensor in there. Maybe you can take it to a local shop and have them weld a bung in it. I am honestly surprised that ZZP sells a DP without an O2 bung. It's kind of a necissary item. They must have a good reason for it.

 

well i mean im at a hotel now cause im hour and half away from base so i would have to go to a shop have the weld it in then hook it back up unhook my battery and plug it back in and hope it works then but why would the af be all over and why would i get misfires from this

 

could have a boost leak somewhere

 

how would a boost leak cause all of this. and i didnt do anything that would cause a boost leak i just replaced a downpipe nothing else

 

You said you put on a Dejon CP too. The O2 went bad on my old S-10. It threw it into limp mode and messed up all the fueling. It was running rich then lean then rich. The comp uses the O2 sensor to tell if the engine is burning rich or lean, from what I've been told. Without the input from the O2 sensor (since yours is absent) your engine might have been whacking the fuel trims all over the place. That happened in my 4.3L though, this is a whole different animal. Just trying to help, I'm not sure what your issue is exactly so at this point I'm just guessing.

 

im gonna see how much to get a o2 welded on and how long itll take try and get this place right when it opens and just tell them my situation and how im military and need to get back to base asap maybe theyll understand and just do it right away for me...how long would it take to weld one on like half a hour