RB25 Woes - Videos - Help me diagnose

[opponheimer]

I tried converting these files to WMV thinking the file size would change; I was wrong. You must right click and save file/target as to view videos.


Mods: Greddy IM, LoveFab turbo manifold, stock maf/injectors/ecu, fmic, gt3582r turbo, tial50mm bov, tial 60mm wg


Knowns:


No boost leaks whatsoever (used boost leak tester)
Code 55 - no codes
Car does not overheat, nothing in oil.
I don't know what RPM it idles at (havent calibrated tach yet)
Stock Injectors (I DO PLAN ON CHANGING WHEN READY 2 TUNE)
Stock Mafs/ECU
Car has very good even compression DRY, and all cylinders bump up 10psi on WET compression test (with oil)
Issues:


Car runs super duper rich, i ran the car for a few hours 2 days ago, and came back to check plugs, they were still soaked with gas.
Car has mad trouble re stabilizing itself after being revved up. It usually just dies (see video).
Car drives fine, however when you come to a stop car usually dies.
Car smokes. Video of car is after it had been running for 30min and driven around the block a few times, condensate had been removed.

Here are the vids, remember to save them because it will take a bit to dload:


http://www.bizlocker.com/cabin.MOV

http://www.bizlocker.com/smoke.MOV

[opponheimer]

Come on, anybody??

[ANVIL]

dont you already have a thread on this? do you have an adjustable fuel pressure regulator? what is your fuel pressure set at? have you tried adjusting your idle air control valve?

if i were you i would just go ahead and upgrade the injectors and get a standalone and get it tuned.

did you just upgrade all those parts? or did you just complete the swap and upgraded those before you put it in?

[opponheimer]

When i got the engine the turbo was broken.. I didn't feel like shelling out money for a new turbo just to see if the car runs good on stock components, I just went ahead and did everything. No adjustable fuel reg. Going to try to tune it friday... I already have AEM. IACV adjustment doesnt help that much. The car doesnt die as bad with the vac line to bov off.

I really wanted to get an opinion about the smoke though... It smells like gas but It doesnt look black.

http://www.bizlocker.com/cars/rb/mini-101_3045.JPG

[Chernobyl]

Did you put an orifice in the oil line feeding the turbo?

Does the car rev fine all the way to redline? Or is it in limp mode and cuts out about 2500rpm?

[ANVIL]

what fuel pump are u using? when u swap an rb in you MUST upgrade the fuel pump and have an adjustable fuel pressure regulator to set to spec. do this and then get it tuned then see how it does

[o0sunkissed0o]

sounds like a vacuum leak........

[clark]

have you tried a new O2 sensor/checked O2 sensor wiring.

even though it's not throwing a code, your symptoms seem related to either the O2 sensor or Coolant Temperature Sensor.

you can also test by unplugging the 02 sensor and see if things change.

i had a similar problem but it was frayed o2 sensor wiring. the car ran fine with the 02 sensor plugged in but the idle was choppy.

[opponheimer]

It may be o2 related, -1 for you 00sunkissed00, i used a boost leak tester on the car. There is an oil restrictor on the oil feed line already as well.. and no kinks in the return line. I do have a walboro 255lph pump as well..

[clark]

It may be o2 related, -1 for you 00sunkissed00, i used a boost leak tester on the car. There is an oil restrictor on the oil feed line already as well.. and no kinks in the return line. I do have a walboro 255lph pump as well..

yeah breh, def swap out the O2. plus juding by that giant crack in the exhaust housing, that thing mustve taken a serious knock which can damage the O2 element which actually my friend has done. he dropped an o2 sensor and it ruins it.

i could be wrong, but doesn't the 90-95 300zx 02 sensor cross reference with the RB25 O2 sensor?

hitup autozone lol

[opponheimer]

I've got a few KA sensors and an SR sensor, any of those might work?? The RB sensor is dented pretty good. It idles at 12-13afr


just called advanced... KA and VG o2s arent the same

[clark]

I've got a few KA sensors and an SR sensor, any of those might work??

if the SR sensor is the fat type it would work.

i don't know about the KA sensors though.

but if they're 3 wire they could work. just try it if they're lying around.

shouldn't all engines idle at around 14.7 or something like that? stoich!

[godsmack]

def. need a fpr for the uped pump and change 02 sensor. should work fine after that.

[opponheimer]

Okay changed O2 sensor, the old one i had was fine though..

Manual says for the Rb25DET the voltage input for ecu pin 29 on the rb ecu (o2 voltage signal) should be between 0.6V and 1.0V at idle....

I'm experiencing voltage 0.22V at idle... What does this mean just running rich? what should i look into now?

[clark]

hmm, ok 2 things.

1. how does the engine behave WITHOUT the o2 sensor pugged in?

2. what is the voltage reading at the actual sensor itself?

i have a feeling maybe there's some wiring between the ecu and the sensor that could be weakening the signal....

how does the o2 harness plug look? when i originally got my swap, it was like chewed up for some reason.

def check those two things, that will narrow it down a tad.

PS: while your'e cehcking voltage and what the FSM says, check your TPS voltage too.

[opponheimer]

wiring is fine... car behaves the same with sensor unplugged cuz it runs rich anyways. I'm checking the TPS today... also gunna check the injector part numbers too.

[clark]

how was the TPS, was it in FSM spec?

[ISsilviaR]

my rb25 did the same thing, and it ended up being that the MAF was wired wrong, so check that maybe

[REP FDF]

my boys rb did the same thing with smoke and rpm hunting.... he got a power fc and tuned... instantly not smoke and the hunting wasn't as bad but alot of rb's tend to do so.... i reccomend u buy injectors and get tuned and a fuel pump if u havn't already you should be fine after that, his setup was similair to urs also i think its ur tune

[240srhatch]

If you say that it runs better with the bov unpluged, then it can definetly be a leaky bov or not adjusted properly. It could be more problems too, like the maf or another vital sensor. If you want bring it over to my shop and I can take a look at it. Im located in Hagerstown MD.

[xsublimefrekx]

what are you going to tune the car with. I saw something about an aem. If it is an aem why dont you just buy the map sensor and install that and the fpr tune it and you should be all set. If you havent gotten the car tuned and are running an aem thats the reason your running so rich. The aem only has a base tune that you shouldnt drive on.

[opponheimer]

The car runs alright i drove it around, it still dips at idle... doesnt smoke anymore...


The o2 signal says its running real rich... fuel pressure with vac line off fpr is 48psig. Friend is coming tonight to get it set up on the aem and hopefully tune it some (i wont get to go to a dyno for another week or so because of limited time he has)

[Zacho]

It smells like gas but It doesnt look back.

When I removed my charcoal canister and did not properly vent the fuel tank breather line it smelled like fuel. Once I ran a line to under the car it went away. Maybe your problem?

[johngriff]

What spark plug are you using?

[DeformityX]

Check plugs, MAF and FPR. your fuel pressure should be around 43-45 psi with the vac line off the FPR. Also, inspect your turbo.