Some of you may have been following the saga in another thread.
Recapping, my Z24i has been cutting out around 2500 rpms. It ran fine up to that rpm "limit". I'll spare you the parts I've replaced, time and money I've spent. Turns out the issue was with a buried splice connector in the main harness that feeds power to the 2 injectors. For some unimaginable reason, Nissan engineers spliced the 2 power wires (one for each injector) down to one wire, then about 8 inches later, spliced it back to 2 wires. This second splice was completely corroded and came apart with the slightest tug. I clipped, stripped and crimped them back together and problem solved.
Here's a pic of the bad splice.
Here's a pic of the other splice (sorry for the fuzziness).
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86.5 D21, Z24i (TBI), 2wd, Std Cab, 175K, had since new. Stolen 9/30/2012 - Recovered 10/3/2012
Thanks to all of you who've followed the thread, made suggestions and hung in there. A very special thanks to Nissanpartsdept for providing the "silver bullet" that led to the final solution.
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86.5 D21, Z24i (TBI), 2wd, Std Cab, 175K, had since new. Stolen 9/30/2012 - Recovered 10/3/2012
Due to a request for some details, I've decided to add to this a bit.
First, the harness in question comes through the firewall on the passenger side then splits. One split runs down the inner fender then splits again into several branches. The pic below shows the harness with a red line. The 2 red circles indicate the approx location of the splices.
Next, there's more than one spice at the location on the right. When I fixed it originally, I only looked at the injector splice. A week later I sliced it up again to check the other splices. You can see what they looked like.
So if you're going in there. Take the time to check them all out!
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86.5 D21, Z24i (TBI), 2wd, Std Cab, 175K, had since new. Stolen 9/30/2012 - Recovered 10/3/2012
This is exactly what my truck is doing! I just got my truck, and it ran fine for a couple of months. A local mechanic confirmed that fuel is cutting out above a certain rev range. I bet this is going to solve it. Thanks in advance....
I hate those splice connectors! Best thing you can do is break out the soldering gun and solder all of those splice connectors for a better and more permanant repair!
I hate those splice connectors! Best thing you can do is break out the soldering gun and solder all of those splice connectors for a better and more permanant repair!
Yep. I cut and re-spliced all of them with solder and heat shrink tubing.
You can see by the dates, this was over 2 years ago. Truck hasn't skipped a beat since.
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86.5 D21, Z24i (TBI), 2wd, Std Cab, 175K, had since new. Stolen 9/30/2012 - Recovered 10/3/2012
Ok, today I had some time to look at if, finally. I can't find any loose wires anywhere, all the plastic connection blocks look fine. Are the splice connectors inside the harness itself? In other words, do I need to slice open all the bundled wires to find them? I also found a few vacuum hoses that are missing in the area behind the throttle body.
To recap, the engine cuts out very suddenly and completely over a certain rev range. All cylinders stop firing as though the ignition was switched off. When the revs drop, the engine resumes. Revving in neutral, it sounds like you're gunning the engine. Under load the truck bucks.
I took it to a shop, and they confirmed I have spark throughout the rev range, and that it's fuel that is being cut off. THey were stumped, and replaced the fuel filter, which did not fix the problem.
When I found this thread, it seems to describe my symptoms exactly. But I'm a bit stuck. I have attached a few pics. Any ideas welcome.
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