miss at WOT with maf-t

[viperlp01]

Ok weird issue and the things that i have changed

issue- When car is warm and has been cruising for a while when i go to WOT at around 18 psi my wideband reads 10.8 solid then when i hit this baby miss and it will pop to 12.xx...
Weird thing is it will never do this when the car is getting warm or just got to operating temp.. If i run it for a while then shut it off for 10 minutes and jump back in it it will not do it

I have done
-spark plugs
-wires
-fuel pump
-Rewire
-alternator
-front o2 sensor
-coil

Im going to swap mafs with my sisters malibu tomorrow... Any suggestions

 

[nytescion]

That would be my next thing to do. can you supply a log of when this happens? What does your wideband read right before/during this?

 

[viperlp01]

Ya Like I said it reads solid and it ONLY happens when the car is "HOT"... Its the weirdest thing... Something has to be heating up and not working properly... But wha can it be.. Is it possible that the maf is getting too hot under the hood. My engine temps are good.. Below the middle mark on the warmest days...

 

[Hal]

Measure the alternator output while hot.

 

[viperlp01]

OK so i decided to pick up some bpr7's the other day and my car was running like a raped ape... I smoked a GTO but we cant talk about that..

Well i drive around for a week and it comes back.. Do u think i need to go to an bpr8?? I must be having spark knock.. The plugs seem to get too hot..

I was thinking When i go into WOT and im at 20 psi my lights kinda dim??

 

[Jeff99GS]

What are you gaping them to? I would try .28

 

[viperlp01]

They are all exactly .028... I think i might lower the gap to .026... I could be blowing them out. Im about to run an injector cleaner and see if my injectors are clogged which is weird because all i run is shell premium.. If that dont work ill try some 8s which is a 2 steps colder... I really cant wait until i buy dsmlink... It is hard to log the 95 ecu.. It is so slow!!

 

[nytescion]

How much boost are you running if you don't mind me asking.

 

[viperlp01]

Well the car is still messing up. I have tuned and tuned my A/Fs to get it to not miss as much but now when i hit 4500 rpms it slams rich on the wideband.. Another weird issue is that when i only go say 3/4 throttle it wont miss and pulls very hard and healty. Im pushing 21psi on 93 pump...

possibilities----

-I never traded GM MAFs with my sister so i might do that tomorrow..
-Maybe my Eprom ECU is fried
-I have shorts in my system...