i have a 9:1 GSR, 1000cc injectors and a gt30r on 17psi tuned by james from speedfactory in tacoma, washington.

for some reason 1,2,3 plugs all come out clean but number 4 always runs rich. we put new injectors in thinking it was that but no luck, copression check and leak down all show good numbers.

also for some reason the power goes flat, it makes 340whp at 5500 and holds 340 till 7500 then it goes up to 365.

anything would help thanks

 

do you have custom manifold or have had port work done?

 

check the wiring to that injector

 

the head is all stock no port work or anything, ill check the wiring and see if that could be causing the problem

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 1fastlude1 &raquo;</TD></TR><TR><TD CLASS="quote">check the wiring to that injector</TD></TR></TABLE>

X2

If i remember correctly if the wires to an injector are cut and the exposed wire is touching it will hold the injector open.

 

i checked all the wiring and there doesnt seem to be any problems with it.