Car won't start when engine is warm.
 

Please excuse the x-post.

Car is an auto 04.5. Car has never done this before until saturday. Saturday i went down to fast intentions to get my true dual exhuast put on and when they we're finished we took it out for a spin and came back and parked it. Went inside, did the payment thing, came back out to leave and when i turned the key over it turned over but almost instantly the rpms dropped to zero and the car shut off. Started again but this time i gave it a little gas and it caught and i drove home. Parked it at home for about 5 hours and went to get back in and she started right up no problem. Drove for 30 mins, ran a quick errand, got back in and it did the same thing. I've proven that it only happens when warm but i'm still not sure what the cause would be. Is this a simple computer tuning problem or something worse?

Summary: Car won't start when warm unless i give it a little gas when turning the key over. Starts right up with no problems when engine is cold. Any ideas?

Sounds like fast intentions is gonna make a couple more bucks.

You probably need to reset the ECU with the Nissan instructions. When I installed my Pop Charger, I reset it by disconnecting my battery and my car would not start when it was warmed up. It would just die right after it cranked. I believe if you reset the ECU the proper way, it will relearn how to idle. If you don't reset, it will eventually learn to idle... well I know mine did but it took a few days.

I always get a kick out of the insanely vague posts.

yea it was only reset by disconnecting the battery. Maybe i'll just give it a few days and see what happens.

If you would like to fix it yourself:
http://www.technosquareinc.com/350reset.htm

sure it isn't an exhuast leak? I know a vacuum leak will cause the engine to die. what about the O2 sensors, possible they knocked it or broke them?

It sounds like a servo motor (IAC) is not opening far enough during warm start. As others have said, try the full ECU reset first.

Just giving you a hard time bro....not too sure how to fix your problem....never had a problem like that with my 03. If everyone says reset the ECU, I'd try that first as its free.

Has the car ever been ECU tuned or UTEC tuned? Stock fuel system and injectors I presume?

Thanks for the link :)

Yeah, I would try this^ first. Is the check engine light on?

No check engine light. ECU hasn't been tune and you're correct on the fuel system and injectors.

Maybe on o2 sensor in unhooked. check that. i have a broken header i have to weld tomorow and my car didnt die.

Same here, I didn't have a check engine light or anything. Hell, it was just the Pop Charger :icon17:

I have a same problem after header installed. I do not have SES light and reset it with proper method. No exhaust leak.
Is there any other way to fix this problem???
Thanks.

The 350z has no seperate IAC assembly.

It sounds like they swapped your car with an RX-8 when you weren't looking.

check the coolent temp sensor when the engine is hot it shuld be 80 dig Centiegrade and above.

if the sensor gets faulty then it will show you 40dig C.

and this will give you hard starting while the engine is hot.

i hope this can help


i hope this can help

That happened to my car. Gave it a little gas and it hasn't done it since. Would love some input.

where is the coolant temp sensor located at?

I would like to res-erect this dead post as i am having the same problem and it has yet been fixed using all of technosquares totorials?


Ive reset it using pedal method and the other things. . . .should i just leave it now to 'learn', despite its dieing all the time?

This is the same ECU that 'cancels out' any mods you do to it, but cant even idle after its brain gets reset??? WTF:icon43: