I'm stumped!

[turbotom20g]

Ok, I have been working on DSMs for long time now so I have ran into so many problems before besides this one. Well, my brother has a 92 awd talon with:

Rebuild 6 bolt block with 8.8:1 venola forged pistons

1g big rods

Stock crank

Balance shafts removed

Stock head (rebuild)

Arps head studs

Felpro head gasket

272 web cams

PTE 50 trim turbo

3 inch exhaust

Sbr exhaust manifold w/ 38mm waste gate turbonetics

Fmic

Greddy type s

Egr block off

Lower half of throttle body block off

Greddy catch can

Ecmlink v3

2g maf

Extrude honed intake manifold

6 bolt intake heat barrier from magnus

Denso 660s injectors

255 walbro

AEM wide band

So here is the problem, the car for what ever reason runs good on a cold start then once
the engine gets hot now starts running pig rich all the way to 10 on the wideband. I did a boost leak test and fix small leaks but currently no leaks what so ever! Brought the fuel pressure down to 28psi and nothing. Swap injectors to 450s, nothing. Made sure base timing was set with timing light, set! Make sure TPS was set correct,set! Double checked my wiring for the 2g maf, check good. Make sure turbo is working, check working good. Stock oxygen sensor is work great, (brand new). So idk I don't get it! What is telling the ECU to run rich?

Any thoughts or suggestions will help me out greatly.

[Ripper_XX]

Post a log

[NoHndlbrsRqrd]

How new is the sensor for the wideband? Could be it is reading rich but is actually fine.

[turbotom20g]

Originally Posted by NoHndlbrsRqrd

How new is the sensor for the wideband? Could be it is reading rich but is actually fine.

Brand new gauge and sensor. I know it's running rich for sure because I pulled out every since plug and they were pitch black and gas soaked. Something is telling the ECU to run rich and not sure what it could be.

[habitatguy187]

Put an ohm meter on the o2 sensor and see what's up. It's obviously running fine in open loop but something in closed-loop operation is screwing up.

[J_DiZ]

Yea, Ecmlink log will help us.

[stilleneclipse]

I'm having a simular problem of the opposite. When I get warmed up it wants to go lean. If I try to drive it then it goes to 16:00 on the wideband and won't pull itself out of a hole 3/4 the drive. Sometimes it stutters back to 13-14 and can drive o.k. Lol I tested pretty much the same as you except for the injector swapping. I was kinda thinking bad injector but since I read this I don't think new injectors would suffice my budget being a waste if it wasn't one.

[wrencher]

Along with the other good suggestions, check cam timing also just to be sure.