RB20DET Sputtering issue 2 years of struggling lots of searching lots of new parts.

[s4dude]

Hello All,

-I have been fighting with this rb20det for some time now.

Will fire right up, but with quick blips of the throttle it falls on its face, slow wind up of the throttle it can rev, to say 4k then it falls on its face as boost builds. only code i get is ignition system malfunction.

here is what i have replaced.

-z32 maf
-new maf pigtail
-CAS
-Coilpacks with new aftermarket sidefires
-Coilpack harness
-spark plugs
-updated new retrofit igniter all hard wired
-fuel pump
-fuel filter


since i first fired the swap up, it behaved this way, and has not changed how it runs with all of those new parts.

I did ohm out the tps, and from what i recall it behaves as it should

more detail on the motor.
-Autech Tuned motor (garret ball-bearing turbo) GTS-R stainless tubular exhaust manifold
-ECU: AJ 23710 0A500 MEC R-49 (Cant find any info on the 0A5) its an early 5 plug R31 ecu
-Swap is into an e30 bmw

any help is appreciated, i am baffled that i am unable to make this thing run right.

[dbeiler]

So you're using a Z32 MAF on stock fuel maps. It's running lean as hell.

Use the correct MAF and the correct ECU or tune your ECU fuel maps for the MAF you're using. Problem solved.

The ignition code is usually displayed because people neglect to ground the coilpack harness to chassis. Is your coilpack harness ground wire in place?

[s4dude]

-coil harness is grounded to the firewall yes.

-stock maf is the n60 correct, and the wiring for it is the same as the z32 correct?

car runs the same with my older n60 as with my z32

[dbeiler]

Z32 should be a N62 MAF. Your fuel maps must be updated when switching from an N60 to N62.

[s4dude]

sure, ok.

i have no desire to update fuel maps. maybe i just never bought the correct stock maf for it.

can you confirm what the correct maf is for the stock rb20?

[dbeiler]

I have no idea. N60 most likely.

[s4dude]

ok, so the car runs the same with an n60. exactly the horrible same haha.

looking at this image:

http://img.photobucket.com/albums/v306/4orcefed-s/NissanMAFS.jpg

it appears that the plug isnt the same. and the pinout is the same order, but offset. can you confirm any of this?

[s4dude]

j60 is the stock from what i understand

[RB240Coupe]

May not have anything to do with it, but checking your Gap on your spark plugs may help.

[TougeSR20Kid]

The only one that I have read and had first hand experience running on an RB20 as a direct replacement is the series 2 RB25 maf but you have to swap the plug as well. The only difference is that you are running one less ground.

But the most important thing to remember is that how you got your motor swap is what the ecu was tuned for. So that's to say that vehicle should theoretically only run correctly how it was set up at first. Which my bet is the issue. If it was running like crap from the get go and had all the stuff it was "tuned for" then it either lost the tune somehow or the dude bs'd you about it being tuned or the guy did a sh!t tune