HARD COLD STARTS

[WU-COLE]

I can't get my Z to start unless I hammer on the gas pedal. Then, when it does start, I have to keep giving it gas for a couple of seconds because if I just let it idle the engine dies. Temperatures have been below freezing here for some time and that is only making the process more excruciating. Today I couldn't get it to start at all and gave up on it for fear of killing the battery.

If I can get my car running and drive around for a while, getting the car to start up again is fairly easy, so long as the car isn't left to sit for more than 4-5 hours. It also will idle fine for me too after a good 15 minute drive or so.

not sure if this has anything to do with it but the problem first started around the fall, I pulled out one of my tb's to change a belt and ever since i put it back in, the starting has been intermittent, some days it would start up right away without even cranking and other days it would take a few seconds, and now that winters here it rarely starts in the morning.


my guess is a bad fuel pump or iacv? it's weird how it starts up normally when under operating temperature but not when it's cold.

(I have: New spark plugs, new coolant, full tank of gas, new starter and lightweight flywheel)

Any help would be much appreciated, thank you!!

[Cheeeky Monkey]

I had the same thing happen to mine. The next time you go to start it up hook up a jumper cable like you are going to jump a dead battery. VG30de motors need full voltage to start. and when I mean full voltage I mean a full 12.0 volts. With a battery that is a little flat the car will spin over quickly but not start. I said all that to say you need a new battery. I know you are going to think I am full of it but just try it I am sure it will start right up with no problem.

[WU-COLE]

Dude i think it's just some bad injectors

[Cheeeky Monkey]

Might be, But here's question, Takes bout 10min on a cold day to hook up a jumper battery and try what I said out, and if it is the problem I might have saved you at least 40 bucks. Injectors start at bout 100 a piece. for the cheap ones. Oh and if it is a injector it will do it all the time not just when its cold fyi. Just try to help hope get running better soon.

[dsastr_clan]

Im having the same issues, look at all the stuff i did. Here the link of my post, so far no one has jumped in...

cold-start-issues-dont-know-what-else-t ... 83979.html
btw cheeely monkey, i tried your method and it didnt do anything, still same issues

[t.mcginley.jr]

Did you replace your coolant temp sensor yet? Or fuel temp sensor for that matter?

Also have you checked for codes yet?

http://www.nicoclub.com/archives/nissan ... ostic.html

[dsastr_clan]

Did you replace your coolant temp sensor yet? Or fuel temp sensor for that matter?

Also have you checked for codes yet?

http://www.nicoclub.com/archives/nissan ... ostic.html

do you think that the fuel temp sensor can cause this?

[dsastr_clan]

is the fuel dampener supposed to drip fuel from the little vacuum outlet?

[WU-COLE]

So my Z starts up fine now no matter what temperature it is outside, i cut open the lower rad hose and drained the coolant, i noticed there was alot of water that got drained. Re attached the hose with some clamps and put new coolant in and ever since that she's been starting up just fine