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Thread: JDM RR issues (please help)

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2021-10-10 11:28:53
JDM RR issues (please help)
Backstory, I missed a shift in my almost 200k stock ser and broke 4 rockers. I then broke the intake cam trying to get it all back together. I got a new cam from the yard, but I could never quite get the timing right. I think it slipped a tooth during the swap process, but I eventually got it running. I figured I might as well swap in a JDM motor as they are getting harder to come by. The motor I got wasn't what I ordered, but it was the only thing I could find around me.

I received a JDM RR... After much reading I determined this motor could work if I swapped the entire intake mani, heater tubes, etc. I also had to swap the distributor as the plug was different and I didn't feel like trying to figure out how to re-wire the RR plug to my harness. I made sure to hook up all the vacuum lines per the diagram under the hood, and all the plugs and connectors are plugged in as they should be. The only code I'm throwing is a crank position, but that's because I put in a light weight flywheel with an upgraded clutch during the swap. (I've read on the forums that anything but the stock flywheel will throw this code) I'm eventually going to swap back to the stock flywheel after I get it machined and I feel like dropping the tranny again.

Motor starts and runs good, but I get a little hesitation off the start and it basically stops making power after around 4k under load. If I creep on the gas it makes power just fine and will pull like it wants to make decent power for a stockish motor (intake, headers, and a full 2.5" stainless exhaust). It kind of feels like it's either running out of fuel or timing. I currently have the timing set around 10-12*. I tried 15 like it should and it just made the problem worse. If I don't creep up the rpms and instead say floor it, the car makes now power and can barely get out of it's own way. I tested the MAF and it's at 1.5v on the nose at idle, so I don't think that's the issue.

The only other thing I can think of is I might need to reset the TPS. I never changed or moved it at all from the location it was in on my other known good running motor that I took all those goodies off of.

Please help....
2021-10-13 19:58:47
Any ideas would be greatly appreciated. I checked the TPS and reset it to .38 closed and 4.02 wot. I also changed the fuel filter and put in 91 octane. It seems to be a little better but the issue is still quite bad and annoying. I'm going to eventually put in a new fuel pump and see if that helps. I'm at a loss of what it could be, so I'm willing to try just about anything. I'm just hoping and praying it's not a motor issue, but I don't think it is....
2021-10-15 21:53:47
That's quite the Frankenstein's monster you have right there. I didn't respond earlier, because I really have no idea how to help. There is just too much that could be wrong. You might have to get back to the basics, and test everything you can think of. Maybe follow most of the FSM diagnostics procedures.
Good luck.
2021-11-13 16:43:35
yeah, turns out the motor was no good. I went on a longer drive than my work and back. It got a faint rod knock which got worse very rapidly. It finally sized the bearing and threw rod 1 through the block. I got a project b13 race car and took the sr out of it. The motor it had swapped in was from a b14 and turned out to be exactly the same as my original motor. All seems good so far, just ironing out a few little things here and there.
2021-11-15 14:00:29
Dang. Well at least you got to the bottom of it. =/
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