No power after wire tuck and part replacement

Discuss the RB20, RB25 and RB26 series engines.
tyer_faith_08
Posts: 3
Joined: Sun Sep 16, 2012 3:27 pm
Car: RB25DET Zenki
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Okay, so I'm new here, but I reference the forum all the time and actually search so I have never had a need to actually post until now. I have a '95 240sx with an RB25DET S2, 3" exhaust, manual boost controller, ebay FMIC, and a no name aftermarket turbo @ 9psi.

2 weeks ago, my car ran perfectly fine and I sat down to tuck the wires and do a little maintenance and after 8 hours, I tried to crank it and got nothing. The next day, I checked, re-checked, re-ran and re-checked every wire I touched and got nothing.

This past week, I acquired a Fluke and yesterday was my next chance to work on it and I disconnected the MAF and got it to crank (in safe mode). I re-connected it and it died. I googled the wiring and I had it right, so I ran the power and ground to the battery and it cranked, but it stayed in safe mode. I got 1.662v from the signal wire at idle and with some throttle and with a little more throttle, but it dropped to +/- 1.4v when I put my hand over the screen at idle. I got a maxima piece (which is what was on it before) and it ran fine. I also filled a 3/8 inch hole that was in the tubing between the MAF and turbo.

Somewhere along the diagnostic process (while it wouldn't run), I disconnected the CAS and spun it to rule out a faulty CAS and I put it back in. Before I took it out, I etched a line at 12, 3, 6, and 9 o'clock positions to be sure that I got it back in the correct location.

Now here's the fun part: The car revs under vacuum great, idles great, everything. When I give it more than 1/3ish throttle, it just slowly revs and the wastegate opens at 9psi, but it just absolutely will NOT pull. My boost gauge is connected to a t-section that is on tube that runs from the manifold over the #6 cylinder to the MBC and my piping is tight as hell so I don't THINK its from a lack of boost or flow. Any suggestions?


tyer_faith_08
Posts: 3
Joined: Sun Sep 16, 2012 3:27 pm
Car: RB25DET Zenki
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C'mon guys, I about to leave for Afghanistan and I really need it fixed for the drive home when I get back. I've googled this problem over and over and have tried every suggestion I've stumbled upon in the past 3 days and I've had no luck. Please, someone help me out here

Yellow4g63
Posts: 3718
Joined: Mon Jan 20, 2003 6:07 pm
Car: 95 Nissan RB20 240SX RB20
91 Nissan NX2000 VE power
95 Nissan 240SX Stock
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not much help but sounds like maybe you have a short some where. Untuck the harness and double check everything you moved, check the path maybe it's getting cut into and shorting.

tyer_faith_08
Posts: 3
Joined: Sun Sep 16, 2012 3:27 pm
Car: RB25DET Zenki
Contact:

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I really need a reference for correct voltage readings. I have an r33 manual, but it's pretty crappy, and the R34 manual isn't complete. Does anyone have a good download link?

Also, how many different models of Maxima MAFs are there?
Could it be TPS related?


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