Car won't bounce off rev limiter! Instead it Boggs down.

[shayandude]

I got a s14 zenki with a sr20det black top s13 motor. If I try and red line it, stead of bouncing off the rev limiter, it just Boggs down and cuts all all power until I go up a gear and once rpm is reduced then its all good until I get to red lining again. I put the car in neutral and it bounces off the rev limiter, but in gear under load it just Boggs down. The car is running at 7 lbs, bone stock minus exhaust and down pipe. Also has fmic. Thanks in advance.

[CSUPUEBLOTIM]

Are you running a wideband by chance?

[shayandude]

Yes, a aem wide band.

[CSUPUEBLOTIM]

Whats your air/fuel ratio look like when this all goes down?

[shayandude]

Car is running lean. Driving around 14.5-17.5
Wot best I can get is about 12.8 to 13.5

[CSUPUEBLOTIM]

Well if its leaning out you will experience your issue. Need to figure out why its going lean. Tune, vac leaks, bad spark, injector, etc..

[shayandude]

I made a post but no one reall said too much. I bought the car about 4 months ago, and it was running lean but I heard a exhaust leak, so we figured that's the cause. So I replaced the exhaust manifold and the elbow back to stock cast. Still lean, replaced with new plugs no help. Found out it was a stock fuel pump, put a 255lph in it, still lean. Unplugged every injector n they all seem to work. Out new o rings on the injectors still lean. Had a leak test done, there was a tiny leak by the t clamp, that was replaced and no leaks. Still lean. Out of ideas. Anything you could recommend?
Only ideas left in me are: hard wire the fuel pump, check the fuel pressure, replace the aem sensor, get new injectors. But that's the money n guess game that lands you no where sometimes.

[Hijacker]

What are you running for fuel management? Piggy back, EMS, re-flashed ECU? Your issue almost sounds like it could be any one of those for it to run lean the way it is.

[shayandude]

Stock ecu
E5

[Hijacker]

What about O2 sensor?

[shayandude]

I have one close to the firewall, back of the motor, someone said try unplugging it, and see of that fixes my problem but made it worse. That's the only o2 sensor. And then my aem wideband sensor is in my down pipe.

[Hijacker]

Hmmm. You don't happen to know anyone to swap ECUs with? As a last resort, try a diff ECU. Also, clean out your MAF. It might have junk all up in it, throwing off readings. If you have a multimeter, you can test the voltage on the output of it. I'll look up the voltage range when I get to my desktop. Last thing I can suggest checking is the TPS and to make sure it's operating in the proper range.

[shayandude]

Unfortunately I don't have anyone I can swap ecu with, ill try and clean the maf first thing tomorrow morning. And ok thanks

[Hijacker]

It looks like you should be expecting MAF voltage to be around 1.6v at idle and 2.0v at 2,000 RPMs. The TPS voltage should be between .5v closed and and 4.0v fully opened.

[shayandude]

Cleaned the maf with crc maf cleaner and that had no effect. Hopefully this week I can get my buddy to bring his meter over so we can test the other two. Thanks!

[PyR0NiAk]

I know you said you did a test, but most people don't tend to check between the MAF and the turbo. If you're leaking there, the car will run lean because of extra air getting into the turbo that wasn't measured.

[shayandude]

Well guys, 5 months into this, and finally issue has been resolved! The two lines from the fuel pump were swapped. So car was getting unfiltered gas, and the recirculating causes the fpr to go bad to. Also the maf was missing the o ring and had the wrong mounting adapter bracket. Car is 14.3 idle and 11.2 wot! Thanks for all yas help