94 300zx 2+2 NA - Long Crank on Cold Start

[94NAzx]

Hi All -

I am new here; I have found a few other threads similar to this one, but i haven't found the solution to my issue yet.

My 300zx NA 2+2 is having issues starting when cold; 5+ seconds to start. I have to push the gas pedal to the floor to get it to start. After a long/cold start, it struggles for 2 seconds or so, then runs great. It starts right up when warmed up. ECU codes I got were 32 and 34. The battery is new, i replaced the terminals on the battery, replaced the spark plugs, and the fuel filter.

I can hear the fuel pump before trying to start, but it sounds significantly different when cold. It seems quieter and has a different pitch. I have tried turning the key to the on position then off and back on, back off, etc. 10x times, and it did not make a difference.

I have looked for gas leaks but have not found any.

Please let me know your thoughts regarding this issue, thanks!

[Ace2cool]

Code 32 and 34 aren't going to give you those issues. That's EGR and Knock Sensor.

I had a similar issue on my 94 N/A 2+2, oddly. Happened after I had some injectors fail hundreds of miles from home and had to get work done at a random shop. Mine would fire right up though, not have to crank 5+ seconds. Ended up going away on its own though. I think all I did was clean the IACV when it first started doing it, but then it just kinda resolved itself a month or two later.

If you're hearing the pump but it sounds different, I'd try to check the fuel pressure on a cold start and verify you're actually getting the proper pressure.