Alright guys.. Hopefully a simple fix.. The car is a Built 2.0../3586.. ect running SD.. Just got the car back and have around 250 miles on it.. Anyway, the car was running great until last night... I hit boost.. (not wot) and the car pulled as usual.. a/f's a little rich, but its just a temporary tune... About 4 min later i went to hit boost again.. but this time.. around 5 psi (thats when my second fuel pump turns on) the CEL flashes telling me its knocking and just hesitates/breaks up BUT my A/F is still rich ... I go to turn into a parking lot and take a look.. the A/F is just --- on my uego.. which is as lean as it will get and the car just wants to stall... i rev the car up to about 5-5500 and the wideband wont even move.. I continue to drive home and drives normal.. just when i go to hit boost and stop i have that problem. Any ideas? Think its in the tune? i just don't see how the car can be good one second, and 2 miles down the road it running like complete crap.

-checked the plugs.. they seem good
-no i dont have any boost leaks..

Any help will be appreciated guys. Thank you

Rob

 

most likely within the fuel map something needs tweaked in that area you're seeing the lean issue. drive car and log it as it does that then check your logs and reference the load with the rpm and afr in the troubled area.

 

ok, ill throw the plugs back in and do that tonight. thank you sir.