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View Full Version : rb20 idle issue


Linux2501
05-12-2014, 12:54 PM
Alright so I just started having this problem here lately when the car is warm it seems to idle wildly and up and down by 2-300 rpm voltage drops from 13.9 to about 12.3 on my safc but on my guage and my pbm digital readout it shows 14.3-14.8 v and I thought it might be my alternator, but I work at advance and using their tester it doesnt seem to have any problems. but then again it has been wrong

My Wideband when im going into boost it usually goes and maxes out at 22. and it sputters and sometimes backfires.

So last night i went and checked the pump since i bought the car and it had alot of rust in the tank along with bad gas and I pull it out and it looks like mud on the strainer, now i do have a dw200 fp that is new and i tossed my 255 i had because the strainer fell off in the tank and i thougth it would be better to goahead and toss it for a new one.


Heres a vid of it running after it dies.


https://www.youtube.com/watch?v=TQrA...eature=mh_lolz
the motor was freshly rebuilt with arp hardware and nissan gaskets Its coming up on the 500 mile mark now and i was told after 500 miles to re torque the head. Could this possibly cause a problem.

I have been using my LEGIT hks ssqv and it was worse with the idle bouncing up and down, but when I had a old what I think is a knockoff ssqv my problem seemed to stop now after 3 days its starting to get worse like it was before.

SO i pulled the vac line off and plugged it and it solved my idle issue but it still wants to die. I had a iacv off my old rb20 that i put on it since the plug was messed up on the old one from the new motor, also I have read where it could be the ecu coolant temp sensor, I havent taken an ohm meter to it, and I also have datalogs from nissan scantech if anybody can tell anything from that.

Boost leak? I have some old couplers that have been used for a good bit. Ive been wanting to replace them along with new tclamps but I am about to get a front facing mani. Ive been told that cleaning an iacv is usually not a good idea same with cleaning a maf what would you suggest?

Bad alt
Coolant temp sensor
Iacv
Boost leak


Also I forgot to mention that i did something i usually dont do with cars but I have a coolant fan temp sensor and the switched power and the backup switch that usually goes to the a/c compressor all on an add a fuse to the fuel pump fuse slot.


Help Please.