SOHC Header Problems

[LSR_S13]

Hey,

I'm new to the forums here and Im looking for some help. I have a 1990 One-via, and I recently installed a header and exhaust. Works well except for one problem, the carpet is burning up where the header and cat bolt up. Let me start from the beginning, the car was running terrible because of a leaking exhaust manifold gasket and it had a stuttering problem off the line. (not sure if related or not)I went and bought a header since the gasket needed to be replaced n e way, and had the exhaust done: maganflow hi-flow cat, oem skyline resonator, 2.25" piping and dual tip muffler. When i first got it back after the first hour/two the headers had already turned blue, black, & brown. Mechanic said engine was running too rich, which in turn burned up the exhaust gaskets for the cat. (replaced those) And carpet was hot on drivers side.Had the timing adjusted, and it ran better. But stuttering problem was still there. ECU scan came up with Faulty EGR code. Tested it and egr doesnt work properly. Want to block it off altogether, but left that alone. Mechanic said ot shouldnt be a problem.Took it to a Nissan specialist, and we decided to start by changing old 02 sensor. Then scraped corrosion off of engine temp sensor and injector terminals. Then realized that the last spark plug wire next to firewall had burned a hole and was jumping spark to the header. (replaced that)It has been running fine but still a little hesitation off the line, and carpet is still very hot/burning (no flames) after driving for a little while.

Since then upgraded from cone filter and stock intake to short ram intake w/ cone filter. Changed the oil and put some injector cleaner in. Desparately need help.

[ricebike]

test for leaky fuel injectors? de-pressurize the fuel system by pulling fuse to fuel pump (10A?) crank till stall... remove fuel rail w/ injectors still attached, turn key on-engine off... see if there's leakage around fuel injectors...

if you're running pig-rich, check if there's too much gas going into the oil... change ASAP so your engine 's bearings don't go to la-la land...