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Hello all. I am new here (obviously), and not even SR20 related, but thought I'd try to bounce the issue I am experiencing off of you, maybe you have some ideas..
Car: '91 240SX
Swap: RB25DET (complete with harness, ecu, etc.)
Ive tried different programs to find one that works with my setup, and have had trouble doing so. At any rate, below are the ones I've recently tried, as well as the issues I am experiencing.
Issues:
Calumsult:
will connect to ecu
will give ecu serial code
will do nothing else - even if you turn gaugepanel ON, no displays, no datalog, no nothing.
ECUTalk -
Will connect, pull ecu code, but it's the wrong code
(will work fine in 95 Maxima VG30DE)
Nissan Data Scan 1.3-
ecu codes as 23710-24U01 (same as printed on ecu case)
fully operates... sorta
-shows mass air as bad (possibly correct)
-pulls MAS code 12
-MAS reads solid .08, never changes
-OXS reads 31, never changes (way rich) AEM WBO2 also connected as standalone, reads 10.0 at idle..
As car warms up, the mix keeps getting fatter and fatter, until it wont hardly run and black smoke is dumping out the tailpipe, and becomes near impossible to keep running
makes no difference in idle whether MAS is connected or not. If you hold your hand in front of the inlet of the MAS while connected, it will stumble. Uplug the connector to the MAS while running, and hold your hand in front again - no stumble. This is holding hand about 1-2" away from MAS inlet.
when reconnect, while running, idle stumbles, quick-revs, then settles back down to 900-1200ish
I need to figure out what is causing the mass amount of fuel to be dumped.. This holds opposite on RPMs above 2000rpm, it goes WAY LEAN and struggles to even stay at the RPM.
Have you checked to see if the injector rail might be leaking air into the fuel system (ie. bad o-ring)? Have you pressure tested the piping system? What is yuor TPS set at?
__________________
'92 Super Black Se-r w/ just mods - SOLD
'91 Super Black Se-r stock (for now )
"I'm more afraid of being nothing then I am of being hurt."
Have you checked to see if the injector rail might be leaking air into the fuel system (ie. bad o-ring)? Have you pressure tested the piping system? What is yuor TPS set at?
I did check the intake plumbing for leaks and whatnot, but all are good. Everything is tight.
As for bad o-rings - wouldnt that just cause a high idle and lean situation, rather than dumping fuel?
Even so, it doesn't seem to account for the MAS reading .08 with no variation at all.
Please do not get me wrong, as I greatly appreciate your input, but I don't see how the suggestions would cause the extremely "fat" AFRs.. Unless I'm overlooking something..
if you have bad orings the car acts all kinds of screwed up- take the fuel rail and injectors out of the manifold and turn the ignition on and see if anything is leaking-
if not cool. if the MAF (mass air flow- your 'mas') is bad- like the ecu scanner says, and like the .08 never changing should tell you- try replacing it. You might have some part of the ecu burnt out so if the maf doesn't work then try going to a different ecu or sending your ecu to someone that can examine it and tell you if it is damaged.
__________________
David Lau email:rockitstock@comcast.net
Good point, thanks..
The situation with the ecu is, there isn't alot of RB25 ecus laying around
The MAF/MAS ( )doesnt consistant code as bad, but the readings indicate it is. What was throwing me way off, though, was the fact of putting my hand an inch or so in front of it would affect the running, but wouldn't if I unplugged the MAF..
That sorta indicates that it is reading "something."
Man, I've been thinking this over and hashing it out too many hours, it's all starting to get muddy to me..
CalumSult won't respond correctly because it is asking for a parameter your ecu doesn't support, and then hanging. Thats odd, I would have guessed your ecu would support everything an SR ecu would. I'm e-mailing you a program to run that will let me know what all your ecu supports, e-mail me the result and I'll see if I can quickly hack a version of CalumSult for your ecu.
If your maf really isn't doing anything than that is your problem. Get a mutlimeter and verify exactly what your maf is doing. This may be easier to do all the way back at the ecu. Whats the p/n on your maf?
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All posts by Calum in this thread are copyrighted by Calum, and cannot be edited, deleted, or copied without his express permission. calum@calumsult.com
Good morning, Calum..
It's a Z32 MAF. I'll get the exact pn# for you this evening. I haven't received anything in email, if you've already sent it.
As for the maf, it's really wierd. I want to say yes, it's bad. But the whole oddity of placing my hand about 1-2" in front of it causes changes in runability, where it has no effect if it's unplugged, tells me it's reading something.
I'll check the book and try to test what the maf is doing and let you know, as well.
Thanks for the help!
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