TwinTurbo.NET: Nissan 300ZX forum - Dead Cylinder
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Subject Dead Cylinder
     
Posted by Zinister1 on October 05, 2012 at 3:08 PM
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Message I have an odd one I have been dealing with for a day or so. My number 4 cylinder decided to go dead, didn't drive hard, or heard any odd noises. Here is a list of what I checked;

Injector- Newer style, 370cc, installed a month ago, all test at 12ohm at injector 10ohm at ECU connector. Tested this through CAS, does spray like its supposed to.

Coil pack- tested good within factory spec, even swapped from a known good cylinder, same issue

Compression-at 150psi, actually 5psi higher than cylinder 2.

PTU- tested out good through a writeup Anton on Nico had, no abnormalities

Spark- It has it, seems weaker than Cylinder 2, but nothing crazy different.

ECU- shows code 55, but when I called COZ, since he is the one that tuned, he said maybe an ignition driver may have gone bad, but why would it still have spark?

The really only odd one out is when I was checking the coil pack connectors, I have juice from the left wire, ones that go to the PTU, middle wire test the same as the other connectors. The far right black wire is showing a higher resistance than the others. It shows 044 resistance when connected to the coil pack, cylinder 1 shows 0, and cylinder 2 015. This is while running. When disconnected, not running, that same wire shows 0. Connections are clean.

I just recently moved to Denver, the drive from PHX was flawless, zero issues. This problem just came up yesterday out of no where. Any insight would be much appreciated.

If anyone has either a second ECU that I can try out to see if it is the ECU or let me come plug mine in, I would appreciate it. Im at a lost and confused on this matter.

     
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