dual intake, car dies out

[Jerrybrown5081]

Hey there, so, did new intercoolers, hardcopies and switched to a dual intake set up a little while back. As soon as I did those modifications the car started dieing once you let off the gas. Just repaired the fuel system and it idles fine now normally, but whenever I let off the gas it still dies out... Any ideas? I'm assuming it's gotta have something to do with the dual MAF and intake set up. Used a pretty common set up for it though so not sure what could be wrong... What could I do to diagnose or repair it? Thanks!

1996 300zx TT
Ash massive intercoolers
2.5" Intercooler piping
Selin dual intake set up
740cc injectors
OBD1 wiring harness swap and tune
HKS BOV's
Greddy boost controller
SZ Downpipes
SZ Testpipes
HKS Catback
SZ/RPS Max Street clutch and Flywheel
Spitfire Coilpacks
Walboro 485 fuel pump

[z.Leinbach]

As for diag. Does it diesel down?? Or just falls flat on its face.? Either the throttle bodies aren't adjusted right or the ecu is killing fuel supply completely. One of the two is getting cut off abruptly. Personally my bet is the air. but when you say let of are you just letting off slightly or completely. Does it run like a raped ape till you let of or does it run like a beast waiting to be unchanged till you let off? if that makes any sense

[nissanfreak12]

Check this out. I Am not sure if it happens with the selin transmitter, but something to think about.

https://www.google.com/url?sa=t&rct=j&q ... 4040,d.cGU

Make sure both MAF are working properly, make sure both are N62 and no corrosion. Also, which Selin do you have? Series 1 has had some issues, which could be what your are experiencing. The newer version is series 2, obviously, I know they did a lot of upgrades. Here is a little bit about it.

https://www.z1motorsports.com/electroni ... -3986.html

[Jerrybrown5081]

She seems to run fine until I pop it into neutral, I can't tell completely if its at full power since it hasn't ran right since I threw on these upgrades though... When I start her it seems that sometimes she'll idle low and cut out, but after a second it starts idling just fine. And if I'm babying her she tends to be good, usually I let her loose is when she likes to fall on her face. Pretty much (in general anyways, sometimes it just falls regardless) the harder I push it, the farther the RPM's drop when I pop it in neutral and then will kill it while she's still going. It's hit or miss if it happens, but its frequent. Also, smells like its running super rich.

I'll give that flower pot mod a shot... Looks interesting. I have an aftermarket front bumper and I'm pretty sure it exposes the intakes to more air, didn't think that would be able to cause an issue at all... As for the MAF's, they are both the correct ones, but one is old so it may have just gone out, replacing that was what I was thinking on trying next. The Selin is the series 2. Thank you!

[nissanfreak12]

You know what you can do, little more work, but take off the selin and install one MAF at a time see if it causes the issue you are running. If it runs ok with one, but not the other, there is your issue.

Also check for boost leaks, this will cause you the issues your experiencing.

[Jerrybrown5081]

So just completely bypass the translator and plug the port directly to a single maf? Would that be ok since she's tuned for a dual intake?

[Jerrybrown5081]

Also noticed today that the red error code light on the translator is blinking, so leaning towards one of the MAF's being bad... Just weird since it happened immediately after putting the dual intake on, unless the brand new one was bad or the stock one chose that exact moment to go out.... I've seen weirder things happen with cars before though so could be it. Lol

[nissanfreak12]

Basically I was saying was install the OEM splitter back up and use install one maf that way, back to factory OEM without the original airbox. But since your ECU is tuned for dual, that will not help. ANd thinking about it, that may be your issue. I think with a selin unit, it was meant to not have the ecu flashed for dual, but for it to be single. I may be wrong on this, but that is the point of the selin unit to compute the duals to single.

I was always told it was a plug and play system, that you are not supposed to flash the ECU to dual intake. The flash for the ecu was meant for one maf then one dummy or splicing wires to have two MAF's without the selin unit.

[Jerrybrown5081]

The Selin has two settings, one is for the plug and play so it can be used without a tune. Once you tune it for the dual intake, you switch it to the other setting designed to be used with the tune.

Plus, it was doing this before the tune when I had it on the prior setting as well.

[nissanfreak12]

Well that is good to know, well the only thing that I can think of is one of the MAFS are bad. If you were closer I would loan one for you to try out.

[Jerrybrown5081]

Haha I appreciate it man! Well I just ordered a new one, hopefully be here by this weekend and I'll give it a shot.