we recentle swapped my gsr motor out of my 94 civic hatch to an ls/vtec, and whenever vtec engages it breaks up really bad. it seems like it's getting way too much fuel. if anyone knows whats going on or can offer me any advice where to start it would be greatly appreciated. thanks
-tommy

 

what ecu are you using? anything for tuning? what's the timing set at?

 

chipped single cam ecu, vafc for tuning, but not set. timing is set right, it feels like it's getting alot of fuel but the air fuel gauge stays stoich

 

unless that a/f guage is connected to a wideband, i wouldnt trust it to tell me the time of day. you need a wideband to accurately tell you the a/f ratio

 

How do your spark plugs look and are they gapped to the correct spec?

 

i will check my plugs in the morning. this just started happening the other day. it ran fine then all of a sudden not so good.

 

plugs were rusty looking. i've never seen this before???