I need help ASAP because I want to take my car to the track this coming friday. I'll try to keep it short and sweet so i'll get right to the point. Couple months ago I messed up my engine racing so I decided to get another engine instead of rebuilding it, the thing is since then i've gotten codes upon codes upon codes.

P1283E
P1283E PEND
P1278E
P1148E PEND CLOSED Loop
P1279E
P1276E
P1276 PEND
P0400G PEND
P0430

So one day the car was misfiring so bad that I barely made it to the mechanic, so he said it's due to your IM spacers. So I messaged Aaron and he told me misfiring have nothing to do with the spacers, the mechanic said if it's not the problem he'll re-install them. The misfiring stopped but the code came back. Meanwhile my car is buring fuel rich. So I changed both air/fuel ratio sensors "was not cheap" and cleared all the codes, drove to work about 45km nothing happened. As I started the car to go home the car started misfiring and the Service engine light started flashing, problem is still there.

So since the engine swap i've replaced the spark plug, PCV valve and the air/fuel ratio sensors and the codes still come back after everything I did. I know what these codes are and i've changed everything in accordance to the codes. So if anyone can tell me what else I can do to solve the phucking codes i'll appreciate it. It's fun racing but these codes are ten time more stressful. HELP!!!

 

For your A/F ratio voes its the altima headers. You should of done your research on them, they cause the codes. Your only cure for A/F codes is to get the car A/F tuned. The computer is looking for stock readings, the altima headers have the primary o2 bung in one cylinder, this is throwing codes. Notice where the PRIMARY o2 bungs are on cattman headers...

Anyway, new o2 sensors wont fix this, as for 430 code, that's normal for someone who has headers. You have an 04? Get a o2 simulator for the SECONDARY o2s, this will get rid of P420/430 codes.

Misfire codes? Check your coils and sparkplugs.

EGR code? Leave the temp sensor plugged in, take the ERG valve and plug it into the harness. It does not have to be connected to the exhaust, just connected electronically. This will eliminate EGR code.

 

The codes that are due to the headers I understand. I tried everything to get rid of the misfire and he said my coils are good. He said he can change the knock sensor and I'm hoping that he could swap my old coils just because they worked fine before the engine swap. But I'm hoping the senior mebers can suggest a probable cause for my misfiring

 

Hey can you explain this a little more for me? "
EGR code? Leave the temp sensor plugged in, take the ERG valve and plug it into the harness. It does not have to be connected to the exhaust, just connected electronically. This will eliminate EGR code." I don't get the part where you said just connect it electronically because it's a pipe that was cut off and disabled from the headers