I have had problems with running lean since I have gotten apr 1+. I replaced all of the vac lines, the n75, got a 710n, and just replaced the MAF. My car drives perfectly around town, and I can drive at WOT all day boosting 18 or 19 psi without problems. When I get on the highway and put it in 5th gear and just cruise anywhere above 75 or 80 my car goes into limp mode. Once I slow down and get off the highway, it usually comes straight out of limp mode and starts boosting up to 18 or 19 again. What the hell could cause a temporary limp mode only at high speeds? (and not be a vac leak, maf or n75?) I have a forge 007 on the way but I dont think that is the problem. Any suggestions this is really annoying. Most of my driving is not on the highway so my car is usually perfect, but the highway thing needs to end. Thanks

 

anyone?

 

that's strange. any codes?

 

I just ran some logs... log 32 illustrates the problem I think. My 2 lambda values were -.2% and 19.5% ...... and after driving around for a while it changed to -.6% and 20.5%.
I just replaced the vac lines, got a brand new MAF, a new n75 valve(stock) put in a 710n, new spark plugs, and new coil packs to try to solve this problem. Nothing seems to have worked. I havent changed my fuel filter yet which I will do, but shouldnt the lambda values be -10 and 10 %
and channel 30 is supposed to be 111 --> 111, but mine range from 111 to 10 in both columns

 

turn the boost down to 16-17psi and see if it goes away. I know on some giac files people have hit limp over 17psi. If lowering you boost works, a 4.7v diode will cure your problem and allow you to go back to 18+psi.

 

I searched and found this about the code I have been getting
"P1136 = long term fuel trim, idling, bank 1- system too lean,

probable causes are fuel pressure/pump, leaky injectors, intake/ exhaust leak, AIR system hose leak"

I think I should change the fuel filter and see if it goes away