hey guys i just got my low compression lsvtec motor back and put it in... im running stock bseries injectors, walbro 255hp fuel pump and stock sohc ecu because i wanted it to run leaner.... when i started the car my wideband read 14.7 then after 5 seconds of running it worked its way down to 10.0 i imediatly shut the car off because its a brand new motor and i didnt want to wash out the rings. there is a aem fuel pressure regulator on the car set to 40psi. i dont think that would cause the car to run so rich. any ideas on what i can do to make it run leaner because i want the rings to seat properly.

edit: ecu is a p06 and i am getting no engine codes.

 

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check the fuel presure regulator, theres a diaphram that is know for going out

 

i dont think its the diaphram...any other ideas?

 

robo, the engine is going to run rich till its warmed up, its in cold start enrichment...unless you jump out the IAT and ECT sensors your going to run rich for a little

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by xerox445 &raquo;</TD></TR><TR><TD CLASS="quote">robo, the engine is going to run rich till its warmed up, its in cold start enrichment...unless you jump out the IAT and ECT sensors your going to run rich for a little</TD></TR></TABLE>

Yeah but isnt 10:1 a/f way to rich?

 

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My oem FPR was fubar and the car was mad rich on startup (and at all times for that sake). I doubt the oem FPR can deliver 40psi even with no internal contents so get that FPR checked

 

i put a stock pump in, changed the regulator even put the fuel pressure down to like 15 psi and it still runs at constant 10.0. i pulled the plugs and they were dripping in fuel so i know its not a bad wideband.

When i put the stock injectors in the car i un installed my resistor box and put all of the 8 wires that go to the dead clip and soldered them together. i dont know if this is the correct way to take out the resistor box but i think the injectors have to be constantly dumping fuel.

 

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