Post by
FawkesThat »
https://forums.nicoclub.com/fawkesthat-u242880.html
Fri Mar 31, 2017 7:48 am
Hello All, I have lurked for a while know, reading up on different posts, but I have not been able to find the solution so I figured I would start a thread. Back story; I have a 1990 240sx (originally a single cam, automatic car) that I swapped in an RB20 using Zero Point mounts, and an OEM series wiring harness from Wiring Specialties. Car was tuned for 444cc injectors, running a Z32 MAF, and a T04E on 17-18lbs of boost. The RB I bought came with a top mount manifold, the T04E (that needed to be rebuilt), LS2 truck coils, and a Freddy Intake. I got the motor put in with no issues (other than the mounts setting the motor a couple inches back so I needed a custom driveshaft), the wiring harness plugged up, the battery relocated, front mount hooked up on the car, vacuum lines ran, etc. Went to start the car for the first time, fuel pump wasn't priming. No big deal, just put a jumper in the relay to get it going. Started the car up, and the idle was very high. Started to go over my wiriing, and noticed that the MAF was unplugged. I plugged the MAF in, went to restart the car, but the car wouldn't idle. Car would run rough, sputtering around ~600 RPM until it would die, after 5-10 seconds. I have read a ton of posts, trying to fix the issues. So far, I have tried..
-Replacing the MAF (tried two different working MAF's with no difference)
-Tried trouble shooting the TPS, checking resistance and voltage (even tried installing a known working TPS, and setting the TPS voltage to .45-.5)
-I pulled the AAC, cleaned it, and tried reseting/adjusting the idle screw, with no difference
-I have tried unplugging the AAC, does not change anything
-I have checked for vacuum leaks (only leak would be open air breathers I'm running on valve covers, but even plugging these does not change anything)
I am waiting for a consult cable that I ordered to come in, to help me better trouble shoot. I can keep the car running if I feather the throttle, but as soon as I let up, it never "catches" idle, it just bogs and dies. One thing to mention as well, I was testing everything with a GT3071r, instead of the T04E. I had someone holding the idle around ~1000 RPM the other day, while I was checking for vacuum leaks. I noticed that the car started to smoke a little bit, it was buring oil. I turned the car off, pulled the down pipe and intercooler piping, and had a bunch of oil in them. I checked the drain to ensure it was properly draining by pouring some oil into it through a funnel, and there was no problem. I am using a restricted feed, so it led me to believe the seals are bad on the turbo, or that I'm getting horrible blowby, even just at lower RPM. I ended up picking up a rebuild kit for the T04E, so I just pulled the 3071 and through on the rebuild T04E.
With all that said, I believe that the issue may either be a faulty AAC, though I have read multiple places that they do not go bad too often. I think that I read that a KA AAC can be used, but I'll have to double check that, and look for one locally to try and test. The only other thing that I could thing, is that I just need to set my base timing higher, which I believe that I will be able to do once I get the consult cable in. I have installed ECUTalk on my computer, but I'm not sure if that program just provides monitoring/datalogging capabilities, or if I will be able to make any adjustments on it. Any one know if there are better programs, mainly looking for something free to download, but I am not opposed to paying if it is worth it.
Sorry for rambling, I tried to put in all information that I figured was pertinant, in a logical manner. I have to say that I am honestly stumped. This forum has provied a wealth of good information, just wanted to see if you guys and gals had any ideas for me.
Thanks