After removing the greddy twins off if my friends z it won't start :/. Got everything back to stock and now when you turn the key on all it will do is spin over. It won't start, also the fans stay on and the fuel pump doesn't come on. I've read on here a a few instances where they had same issues but no one comes back with a diagnosis.. Also some say that it's ecu or ipdm issue. I have switched out the fuel pump relay for the ac replay and still no luck. Also while my friend was connector the oem injector plugs back the the oem harness (previously had the rc440s and their connectors wired in) anyway while doing that my friend was going to solder the connections rather than crimps. So on the first one he was going to sold he did 1 wire and it was fine, then goes to solder the other wire (same injector) and it arked a little. He tried once again to make sure that it wasn't just a coincidence and it did the same. Soon as the soldering iron touched that wire it would make a small ark. Also if I remeber correctly when he did this I could hear what sounded like a relay turning on. Btw the battery wasn't even in the car at the time

 

Bumpedi bump

 

ive seen someone else with this problem, they said they checked the fuses but im not sure if they checked the fusible links on the positive cable or not. not sure how nissan has the 350z wired up on that but its easy to check them.

 

Thank you much. I don't believe it would be a fuse on the positive side terminal. If so I done think I would have say power. I have power to my car

 

more than one fusible link, its hard to understand what you have checked so far, did you see if the fuel pump is getting power.

 

I am having the same problem with my 2008 Nismo. It was cold here the other day and I was sitting in my car with it idling in order to warm the oil/motor. All of a sudden, it died. Cranked, but wouldn't fire. Fuel pump wasn't coming on, but the fans were on (car wasn't up to temp). Towed it to shop, and they said there was a problem with the control module (not sure if right term) that is adjacent to the battery. They removed it and checked all connections, cleaned it, and the car fired up. I picked the car up Saturday morning, and while driving the car just died. Same problem: cranks, but fuel pump isn't coming on, won't fire. Any ideas?

 

I would start at the fuel pump and work my way to the battery. I had a similar issue with my firebird I had. What I did was took the fuel pump out and touched the wires from the fuel pump straight to the battery (obviously remembering positive to positive and negative to negative.) If the fuel pump kicks over hard then its good, and you can continue your search up the wires and relays and such, but if the fuel pump barely moves or doesnt at all then there is your problem. So what I would do i start at the back at work my way to the front, I hope that may have helped a few of you.

 

I'm currently having the same issue with my 2008 350z, I was driving home from lake arrowhead and my car shut off on me, i get power, car cranks but doesnt start. I can't hear the pump prime up like it use to and the radiator fans stay on. Did you find the solution to the problem??? I hear it could be the cam/crank sensors but I've also read fuel pump would be the issue which seems like my best bet since I haven't had a cel pop up. Mind you i had a cel before the car turned off but it was just for an o2 sensor on the test pipes. I would really appreciate any feedback. Thanks

 

When the fans run at key on, it means the ECM isn't communicating. Several possible causes... Could be the ECM relay, one of the two fuses, connector loose, bad ECM, pinched wire, etc...

 

Did you have this same issue on a 350z and resolved it by changing the ecm or are you just going off of knowledge basesd on the fan running. I haven't seen anyone ever mention a bad ecm, fuse etc mainly get bad fuel pump, bad crank/cam sensor but they never really seem to deal with the fan running and fuel pump not priming issue, just crank and no start.

 

I was a Nissan tech for 4 years and have been working on cars for over 30 years. This applies to all Nissan's, not just the Z. When the ECM stops communicating, the fans come on because that's their default. It's a fail safe to keep the car from overheating and blowing the motor. When the fan controller doesn't receive any signal from the ECM, it turns the fans on at full speed. This is also why the pump isn't priming. It's controlled by the ECM. This doesn't mean replace the ECM. This means you now know the problem and need to diagnose the cause. ECM not communicating can be caused by any of the things I mentioned. You'd be surprised how often it's one of the two fuses because people don't realize there are two.

 

ok sweet I will definitely start there then, I really hope it's just the relat. I appreciate the help, i will leave an update after I try it.
UPDATE* IT WAS MY ECM FUSE. YOURE A HERO A BOSS THANS FOR THE HELP.

 

im having the a problem where the pump is not priming but cranks, checked the fuze it is fine and still not priming, everything is connected the car cranks but doesn't start, also does not get spark took the plugs out and attached to the coil and there is no spark visible, we see that the security system red light on the dash turn on which we are trying to figure out if thats stopping it from turning over and no spark or stopping the pump from priming

 

did you end up fixing the issue ?

 

Aye bro I changed my ECM fuse and my car started right up