u/Aggravating_Beat2424

2003 350z

Swapped the ecu and harness to a 2004 after engine swap. was driving just fine until yesterday i turned it on one day and it bogged down and died immediately. Cranks fine but hasn’t started since. The past 2 months ive had a p1065 code appear every now and then but it always goes away on its own. I did a code read since my car won’t start and it’s back again and the only code i have. I tried using my old ecu to see if it would fix it but no difference. My fuel pump won’t prime when i turn the key on. But everything else electrically seems to be working fine. Pulled all plugs and coils, inspected wiring harness by the ecu, checked cam and crank sensors. my ipdm is the only electrical part still from 2003 so i was thinking it might not match with my ecu and harness from 04. I did change some fuses in the ipdm recently also which leads me more towards believing that’s the issue. Maybe the fuel pump relay went bad? If anybody has any insight or ideas we could brainstorm it would be very helpful .

Was driving fine. i did replace some blown fuses in my ipdm a but before this. Went to start it again. And it bogged down and died really quickly. I’ve only had a crank no start since and p1065 code. I’ve had the p1605 code before over the past few months but it usually goes away on its own but now it’s stuck here with the crank no start. tried using another ecu and nothing changed. everything seems to work but the fuel pump doesn’t prime when i turn the key on. maybe a blown fuel pump relay?

I noticed the 350z used a lot of different ipdms throughout the years as there are multiple part numbers. if you change your ecu and harness do you have to match the ipdm to the year too?

Was driving my 350z it had some stalls and misfires ( both upstream o2 sensors are offline because it’s a 2003 narrowband chassis and i have a 2004 harness and ecu with wideband o2s and commectors. i have closed loop b1 code which i believe is a a separate issue, just throwing it out there). turned it off and when i went to drive it the next time it bogged down and stalled out now all i get is crank no start. I don’t hear the fuel pump priming when i turn the key on. it usually primes everytime but misses it sometimes if it’s warm or just primed already. (rare for it to not make the noise). I was replacing some fuses in the ipdm box before this happened. I did replace my fuel injectors and the gold rail about a week ago but they seem to be working fine

Was driving my 350z it had some stalls and misfires ( both upstream o2 sensors are offline because it’s a 2003 narrowband chassis and i have a 2004 harness and ecu with wideband o2s and commectors. i have closed loop b1 code which i believe is a a separate issue, just throwing it out there). turned it off and when i went to drive it the next time it bogged down and stalled out now all i get is crank no start. I don’t hear the fuel pump priming when i turn the key on. it usually primes everytime but misses it sometimes if it’s warm or just primed already. (rare for it to not make the noise). I was replacing some fuses in the ipdm box before this happened. I did replace my fuel injectors and the gold rail about a week ago but they seem to be working fine