s13 RB25DET, Stoped, was running. PLEASE HELP!

Post by **Fibre guy** » Sun Mar 08, 2009 1:22 pm

I have a rb25det in my S13 swapped in perfectly. Fully rebuilt the motor.(Crank, Rods, and Cams are the only stock internals) Cleaned and flow tested injectors 400cc 98.8 balance%. Did a 30 min. Initial driveway start-up.No problems, No check engine light, revs perfectly. Then I went for a test drive. Did a 5 min under 45 MPH cruise, accelerated/idled normally for a long while and then all the sudden it falls flat on its face and couldn't stay alive for a second no matter how many times I tried. Got it home and went over every square inch of wire in the engine bay. ECCS and Fuel relay working and I have spark and fuel (35 psi). CAS tested perfect. Was running, and better than a brand new car too, so I know the wiring's not wrong. Here's where I get confused... When I pulled the plug off the MAF sensor it fired right up. Tested the MAF and the voltage was .2 instead of the .8 FSM specs. Bought a new one and its a perfect .8. Went to plug it in and start it up and I get nothing. Same problem as before. This is driving me crazy, PLEASE HELP if any of you know the answer.

Also when I try and start the engine it fires up for half a sec. and smells rich. gas pedal up or pressed.Didn't do blk/ylw to aac blu wire either (aac had blu/wht wire, didn't trust it)Didn't do Blk/Ylw to ignition coils either.But it started and ran like a champ.

Got a check engine code when engine dies so is there anyone here in Lehigh acres or ft Myers FL with a nissan consult?

Any help at all is a benefit to me!

Post by **eh?** » Sun Mar 08, 2009 1:32 pm

What code did you get?

Website · Post by **USMCgetsome** » Sun Mar 08, 2009 1:49 pm

reset ecu by unpluggin the battery. Plug in maf and then plug in battery. Start up and check for codes.

Post by **Fibre guy** » Sun Mar 08, 2009 11:20 pm

Ok, will try and see what i get. Thanks for the quick replies.

Post by **Fibre guy** » Mon Mar 09, 2009 10:39 am

Reset the ecu but the check engine only comes on after it dies or before i start it, I guess I'm going to have to dish out some money for a consult. In the mean time, any more suggestions?

Post by **ddjernes** » Mon Mar 09, 2009 6:26 pm

Sounds like you may have a bad connection in the maf wiring extension. Unwrap it and check for continuity or do a voltage drop over the wiring section.

Post by **Fibre guy** » Mon Mar 09, 2009 7:12 pm

Do you think that would cause it to not start? I'll still give it check though, thanks for the suggestion.

Website · Post by **USMCgetsome** » Mon Mar 09, 2009 9:44 pm

bad maf/wiring will certainly cause that issue.

Post by **Darius** » Tue Mar 10, 2009 1:57 am

Did it run out of gas?

Post by **Fibre guy** » Tue Mar 10, 2009 2:16 pm

I knew sooner or later I would get a reply like that. Of coarse I didn't run out of gas... It runs fine when the MAF sensor is unplugged, and I'm getting constant 35 psi.

When i get a chance I'll check the MAF wiring extension and see if any of them shorted out or burned up.

Post by **Darius** » Tue Mar 10, 2009 2:42 pm

What is at 35psi??

Check for loose/blown-off/torn couplers.

Post by **Fibre guy** » Tue Mar 10, 2009 3:22 pm

Fuel pressure PSI... 34-37 is the correct amount right?

Post by **Darius** » Wed Mar 11, 2009 2:59 am

Nope that is about 20 psi low at idle. You're lucky you didn't blow the thing up with that low of a fuel pressure.....

It should be 53 psi with the vacuum line off of the regulator.

Post by **Nissan2367** » Wed Mar 11, 2009 3:59 am

I thought you were suppose to be at 42? oh well i dont think thats the problemit sounds like my issue i had, its for sure MAF related now you just have to search the wires adn if thats good buy a new maf.... i just happen to have a brand new oem RB25 maf sitting in my garage i would sell for a reasonable price if you need one. i bought it cuz i thought mine was bad... guess not!Shoot me an email if you need it!

Post by **Fibre guy** » Wed Mar 11, 2009 4:35 am

Well then.. I think you might have found my problem? battery is dead because I left the gauge lights on. Will test when I can get it charged and let you know.

I feel kinda stupid just ran over the tread i had bookmarked for the fuel psi and every one is saying line off 43 and 53 PSI 40ish with line on. I remember the numbers wrong

Also if i can figure out how to post pics I'll post my build and the new coil cover I'm making. It rises with the back of the valve covers. Finished in blue and black carbon/Kevlar.

Scratch that went and tried it with the fuel psi readjusted and same results. I know its not the maf I have 2 of them right here and one tests perfectly. Is there a chance my ecu got fried on my test drive?
Modified by Fibre guy at 8:40 AM 3/11/2009

Post by **Nissan2367** » Wed Mar 11, 2009 5:35 am

It could have... did you check over your maf wiring? its easy to mix a wire or two up!

Post by **Fibre guy** » Wed Mar 11, 2009 5:49 am

Yep, went over every wire that I soldered, color and connection... I'm ordering a nissan consult for my laptop right now. I ran across a thread on here that said something about a test mode in the ecu might have turned on??? I figure its worth a try, just about to jump off a cliff either way.

Post by **240z4u** » Wed Mar 11, 2009 6:32 am

43 psi line off for stock injectors.

Post by **Fibre guy** » Sun Mar 22, 2009 4:16 pm

I'm still waiting for consult to get here anyone have any other suggestions? I need to get this rolling before I move to new house next month... I want to drive it there!!

Post by **rb25det250sx** » Sun Mar 22, 2009 6:26 pm

remember that for the ecu to reset itself teh batter has to be unhooked for 20-30 min.. then idle for 5 to recompute the configurations

Post by **Fibre guy** » Mon Mar 23, 2009 5:01 am

The real problem is that it won't start in the first place without the MAF senor unplugged

Post by **rb25det250sx** » Mon Mar 23, 2009 2:34 pm

well start it up wit out the MAF sensor let it sit and idle, then plug it in.

Post by **Fibre guy** » Tue Mar 24, 2009 10:33 am

Instantly dies as soon as the maf is plugged in.I just resoldered all wires and checked for any sign of anything burning. opened up the ecu to see if anything might have arc'd and nothing clean as a whistle.I got the consult today but for some bad luck reason the laptop i was going to use doesn't hold a charge and won't turn on.I really need to get to the bottom of this wiring issue... Is there someone around here with an r33 s1 RB25 in the Fort Myers area to try my ecu out in their car to see if it's the problem?

Post by **rb25det250sx** » Tue Mar 24, 2009 5:54 pm

oh.. have no idea then.. i cant help to there i have one but i live in iowa..

Post by **Fibre guy** » Tue Mar 24, 2009 6:36 pm

I'm about to say screw it and buy a stand alone ecu and change to map. this problem is driving me crazy. Another thing I notice is after I plug the maf sensor in and try to start it when it turns off and i take the key out, all the gauge waring lights and ecu light stays on. The person who owned this s13before me did a really crappy KA24DE swap and ghetto rigged the electric windows, took a long time to redo them right, so who knows what else he did... I'm going to be going through my entire dash wiring harness first thing in the morning to see if a wire melted and is arcing with another one or something... Meh, it took a long time to tidy and tuck my wiring harness.
Modified by Fibre guy at 11:40 PM 3/24/2009

Post by **virus77** » Wed Mar 25, 2009 10:06 am

Good luck to ya, I had a shop before and I got so sick of fixing peoples crappy wiring jobs.

Post by **Fibre guy** » Wed Mar 25, 2009 12:27 pm

An update for everyone...Problem is still the same. Working on getting the laptop to work but in the mean time I found something else out. After inspecting all of my wires in the interior I decided to try and start it again. Pressed with and without the gas pedal all the way down, no start. THEN I got frustrated and kept pressing the pedal on and off, and it studdered on revs just fine but when I let off the gas to see if it would stay alive at idle it dies. It won't stay on under 2000 rpm. Any thoughts?

Post by **Fibre guy** » Thu Apr 02, 2009 6:27 pm

I got the laptop running and finally tested it... The MAF works perfectly. (still wont run with MAF plugged in under 2000rpm)I don't know the values for the o2 sensor so i don't know if its working or not.The IACV-AAC valve was fluctuating in a weird way dunno if this is the problem either.So basically, I'm trying to narrow down the possibilities of whats wrong.

Will the IACV or ACC valves stop the car from being started?Will the 02 sensor stop the car from starting if its broken?10 days until I have to move, NEED THIS FIXED ASAP...

Oh yeah. ECU code was "MAF sensor error, 42 starts ago", I replaced the MAF and 42 starts ago sounds pretty right .
Modified by Fibre guy at 10:35 PM 4/2/2009

Post by **legit240sx** » Thu Apr 02, 2009 7:25 pm

thought this might help if you have a bad o2 sensor. I don't know if a o2 would explain your problem. Just read this off of meggala

" They are the same as ford ef-el one just cut off the plug and fit the nissan plug about a third of the price. "

Good luck man

Post by **Fibre guy** » Fri Apr 03, 2009 7:58 pm

Anyone? I'm really in a rut people...

Could it be the ecu took a ****?
Modified by Fibre guy at 1:26 AM 4/4/2009

s13 RB25DET, Stoped, was running. PLEASE HELP!

s13 RB25DET, Stoped, was running. PLEASE HELP!

Re: (eh?)

Re: (Fibre guy)

Re: (Fibre guy)

Re: (KUILLIN_DRIFTER)

Re: (Fibre guy)

Re: (Fibre guy)

Re: (Darius)

Re: (Fibre guy)

Re: (Nissan2367)

Re: (Fibre guy)

Re: (Fibre guy)

Re: (rb25det250sx)

Re: (Fibre guy)

Re: (Fibre guy)

Re: (rb25det250sx)

another update....

Re: another update.... (Fibre guy)

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