dlong22

Well it's official, I'm at wits end with this Z.

If anyone could give me any tip on what I can try I'd Greatly appreciate it.

I have an '03 Enthusiast A/T

Here is a list as to what I have checked/replaced:
1. Spark plugs replaced
2. 2 coils replaced
3. Battery deep charged
4. Verified throttle body opens
5. Replaced both cam sensors
6. Replaced crank sensor
7. Checked fuses haven't replaced any
8. Verified fuel pump operation - haven't checked rail pressure due to not having adapter
9. Pulled injectors and cleaned them + replaced o-rings
10. Verified grounds on wiring harness clean + connected
11. Cleaned battery terminals
12. Cleaned MAF sensor/ tried starting without it
13. Tried starting with cam sensors disconnected
14. Verified starter motor is spinning

Idk what else to do at this point and I'm ready to sell it if I can't find anything out.

It's throwing no codes

I'm desperate!!!

If anyone can help or shoot some ideas I'd appreciate it!

dboyzalter

iTrader: (3)

Could have forgotten to plug in that harness that sends power to half the coils.

Does it sound normal when it cranks

How's the key situation

dlong22

I verified everything was plugged in, and it cranks strong but has a stutter while it cranks? Also what do you mean the key situation? It's programmed and the anti theft light goes out if that's what you mean?

Tomek350Z

iTrader: (14)

get a noid light and verify the PCM is toggling the injectors and coilpacks. When it turns over does it sounds like it has compression? At the end of the day, engine needs air, fuel, spark and compression, so you are missing one of those. I forget on the Z's but It may have multiple fuse boxes. I assume you checked the one in the drivers footwell.

dlong22

Thanks for the suggestion, the noid light is a good idea, I'll order one and see what I find.

icer5160

iTrader: (4)

Exactly. Verify you have good spark. Fuel is easy to check, just crank and pull a spark plug, it should be wet with fuel if your injectors are pulsing and getting some amount of fuel pressure. Compression is also easy to check.

If you're getting a stutter or out of balance cadence while it's cranking, that's usually an indicator of a compression imbalance. Basically one or more of your cylinders may not be sealing. Now, if this stutter you mentioned is actually the engine firing on some cylinders, then you may just have bad ignition timing. Double check your coil pack harness plugs, people always mix up some of these due to the location of the harness plugs on top of the valve covers. The plugs should have white sticker labels numbered 1 to 6, but by now they have probably turned to dust and flaked off. Still you should be able to figure it out with a wiring diagram or simply looking at high-res engine pics online. But, if I were you, I would get a compression test done 1st before anything else.

Note: To execute a proper compression test, you need to pull all the spark plugs 1st, and make sure the throttle body is wide open when cranking the engine with your gauge hooked up.

Good Luck! I hope your engine isn't hosed.
-Icer