Those with 20's please read. Have big question

[ibzbro]

do any other onwers out there have problems starting there car when it is cold? with mine it seems that i have to pump the gas then it sputters to life, but when it is hot it starts on the first shot. now i have done 6 rb20 swaps and one of those was in a s14. the s14 had no problems starting when cold, it only seems the s13 has the problem. dose it have something to do with the heated o2, that is not hooked up in the s13. i am trying to fix this little problem. thanks

[Wulfgang]

If you search, you will find that several people had that problem. Did you wire up the air regulator to the fuel pump relay?

Starting has nothing to do with the O2 sensor, btw. The O2 sensor is not used until it heats up to operating temperature. Even a heated sensor takes almost a full minute to reach operating temperature.

[ibzbro]

which wire is the air regulator. i have never heard this before.

[Wulfgang]

The B/Y wire coming out of the Q plug on the RB harness. Search on "air regulator" in this forum. I remember somebody having cold start problems even after connecting the air regulator on the S13 tho, so this might not work for you.

[ibzbro]

still dose the same thing. owell back to the drawing board.

[frosted flakes]

yep i got the same problem it suxs bad i still duno the problem..