jginther1981

okay so tonight my Z fired up.....it is about 20 degrees warmer though. Checked my cold start valve cleaned it up and started the car. Problem is my car is acting lean when i press on the gas until it is warmed up. I hear the fuel pump as usual, but when it is now at operating temperature and idling and 1000rpm...the fuel pump makes a whirring/whining sound.....could this be the issue to my cold start problem....do fuel pumps start going out and not want to start in cold weather?

rogerz

chts often the cause of weird problems between hot and cold. Vacuum leak another possibility. put a gauge on it. get your fuel pressure at the ring. listening to the pump tells you little.

jginther1981

chts? are you talking about a coolant temperature sensor? i'm not familiar with that acronym rogerz.

WildmaN

CHTS Cylinder Head Temperature Sensor It is located on the passenger side of the head. Check the connector and contacts. Also if you want, you can check the voltage. I don't know what it is though. Mine have always worked.

J-cubZ

No hes refering to the head temp sensor on the passenger side of the engine by the number 5 & 6 spark plugs. Is your AFM working? Check your fuel pressure and filter.

Check spark, fuel and air...

jginther1981

got a fresh fuel filter, not sure about the pump though. is the afm the same thing as a mass air flow sensor?

jginther1981

although when i changed the fuel filter....it didn't shoot out, it kinda just ran out by gravity. i expected some pressure. i am trying to located that cylinder head temp sensor, but i can't find it online.

jginther1981

i mean i'm trying to find it for sale. i have a chiltons that shows it on the car. lol

attacksoma

http://www.xenons130.com/reference.html
Use this link to Download the work manuals..plus its a good reference site for the 280Zx