Post by
tyer_faith_08 »
https://forums.nicoclub.com/tyer-faith-08-u209744.html
Sun Sep 16, 2012 4:11 pm
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?