RB25DET List Of Problems

[240z4u]

The more the merrier IMO. We need enough guys there to basically make it impossible to move around in the garage.

We are meeting up at his house after we get off work @5. I suspect its either not going to be too hard to figure out whats wrong or it will be mind boggler. In that case, definitely want your help. Would be sweet if you came out anyway, but not sure what your schedule is like tonight and its a haul from your joint!

Email me if you don't have my #, or drop me a text.

Evan

[lilskyline240]

wait u guys are doin it tonite? i thought u were workin on it tomorrow. cuz tomorrow i got nothing after 4

[240z4u]

Depends on how things go tonight, if I can't figure it out I am sure he would love to get at 3rd opinion!

Evan

[Nissan2367]

First of all thank you everyone for the offer to help!Huge Thanks to Evan for helping me tonight! Well we found a slight list of problems with the car. (Evan if i fail to list something or if i say something wrong go ahead and correct me)First we tested the signal and ground to the maf. we found there was no power to the maf. we (evan) started to trace the wire back to the ecu and didnt find any issues with the wire itself. we tested it again and suddenly we had power (wtf) but now there is power so were golden!Second we tested for ground and signal to the o2 sensor. there was no ground. we cut the wire and grounded to the bodythird all my plugs were gapped way to big and covered in gas... we gapped them down and cleaned themthe car started and ran better at this point!When i pulled the bov reserculation (sp) tube off i had a bright idea to plug the intake pipe with a bottle cap (thats my honda side coming out ) we plugged that hole and the bov and amazing the car idled.... really well! PROGRESS!!!So now i am going to...Buy new plugs, plug the hole the right way, buy a new O2 sensor (The old one is in bad shape), and ground the o2 sensor to the body.The only thing we are wondering is what could put the car into limp mode. the car runs but wont rev due to being in limp mode! So the new question is What Sensors Cause Limp Mode?!Thanks again to everyone for the help! Next time we work on my car anyone is welcome to help!

[240z4u]

I wasn't going to mention the bottle cap thing! lol

His MAF is definitely not bad, we had two. The ecu is in question and the cas is still in question. My car ran fine with his cas but never tried to rev it up.

The lack of ground to the 02 sensor heater leads me to question that ECU.

Evan

[lilskyline240]

your positive its not the MAF? i went thru 3 diff mafs before i finally got one that worked right and didnt put my car into limp mode. my car would rev just fine but had NO power at all.

but it does sound like an ECU problem to me. did u guys try out your spare one that you borrowed to me?

i think i might have a spare CAS in my loft so ill check for that tomorrow and could possibly bring it out to madison if u guys are still gunna be screwin with the car tomorrow

[240z4u]

He did try my other ECU, but there was enough other small problems with the car that he may have not noticed if there was an improvement. Especially since the +12v was not present at the MAF.

His MAF is actually new, that cas was pretty hard to turn compared to my known good one.

I am not sure what I have going on tonight, kinda hoping to get this ford ranger out of my driveway and off to the mechanic for a motor swap. (buddies truck).

Ben, email me your # I think I lost it.

Evan

EDIT; Keith, don't forget to set your base timing.
Modified by 240z4u at 6:12 AM 1/29/2009

[toadx8u]

i agree with lilskyline240...this sounds like a maf issue...either wiring or the maf its self...i had one go bad on my ka a loooong time ago...it wouldnt rev over 2.5-3k generally thats the dead give away that the maf is not able to read the air coming into the motor...hit me up later tonight evan why hadnt you asked me about this friggin Douche bag...lmfao

[lilskyline240]

i still believe its a maf problem.. A CAS problem seems like it could be that but normally when the CAS takes a crap nothing works. car wont even run.

after rereading the post the ecu does also seem to be the culprit if the 12v signal to the maf is intermittent. that messed up signal could have actually ruinted his brand new maf partially.

[240z4u]

12v comes from the ECCS relay for the maf, which had power out, but no juice at the sensor. I pulled the harness through the firewall and all the sudden we had power. Something fishy there.

The 02 sensor heater ground seems to be in question too, it grounds through the ECU and was not working.

I agree about the problem having something to do with the MAF.

Ben, did you ever re-test that ecu of mine after your buddy worked on it? Just wondering if the maf ground circuit is working in it now.

Evan

BTW; Keep in mind this car wouldn't even run when I got there so we are definitely making serious progress!

[USMCgetsome]

get that wire harness out and do some continuity checks. I agree with the maf incident. The first one i had would just kill the car after a few secs of running. After i replaced it i a few months later i found out that my fuel pump at idle would work fine but between 4k-5k would stall then pick up like it had no issues.

[Nissan2367]

As far as working on the car today i am super busy so i wont be able to get to it tonight.my goal is to get all these parts in this weekend and correct all the issues then we can go from there. One thing at a timei will be pissed if my new maf is bad they are not cheap!I am going through the harness and making sure all the connections done by wiring specialties are good and go from there.

[toadx8u]

if your maf ends up being bad let me know ill sell you my old known good rb25 maf

[Nissan2367]

Thanks man!I am just pumped the thing idles!When Evan and i work on the car again if anyone else want to come they are welcome... i always have cold beer and more people looking at the car the better!

[lilskyline240]

well i might be able to stop out for a bit with my friend kori who is also on this forum tomorrow night if u guys gunna be workin on it?

I did test the ECU after he fixed it and the MAF seemed to work fine but then again im not sure cuz the maf i was testin it with was bad? but i never had the ground that wire to chassis after he fixed it. The tach signal doesnt work tho still cuz he didnt have any of the resistors that were needed to fix that.

evan give me a call if u are gunna be headin to work on it tomorrow night. cuz ill prolly come out just for extra parts to swap onto his car. like my known good ECU and MAF

[240z4u]

Ben, I am guessing it will be next week sometime? Ill let you know whats goin' on man!

Evan

[lilskyline240]

man u guys need to get on that ****!! lol when my RB wasnt running right i didnt rest until i fixed it lol

i say u guys suck it up and work on it tomorrow. plus my girl kori is addicted to RB's. i let her drive my 240 instead of her TSI for one day and she fell in love. NOw shes lookin to sell her TSI and daily driver focus and is buyin a s13 and doin a rb25 swap lol I guess my car has that affect on ppl

not tryin to thread jack but i nkow there are some WI ppl on this threat. we startin up a meet for WI ppl so heres the thread for the second annual WI nissan meet up zer...event
Modified by lilskyline240 at 3:50 PM 1/29/2009

[usmctankmech]

Its normal for the CAS center to spin.

[Nissan2367]

Haha well tonight i am picking up the o2 sensor, the spark plugs and the plug for the intake pipe. I am hoping to get it put in today or tomorrow but i am super busy lately! But lilskyline240 that would be awesome if you came up to help! I am just going to go through the harness and make sure all the connections are soildered but since i know nothing about wiring ill wait to do anything with it until you guys get here!
Modified by Nissan2367 at 8:32 AM 1/30/2009

[lilskyline240]

so you guys are workin on it tonite now?

[Nissan2367]

No not tonight... i am just throwing that stuff in then stopping. i dont have time to work on it tonight really. Ill let you know next week sometime.

[240z4u]

My coat still smells like a gas station.

[lilskyline240]

My coat still smells like a gas station.

dude trust me i know how u feel lol. The sweatshirt i use to work on cars with will smell forever like trans fluid. No matter how many times i wash it. that smell remains

[Nissan2367]

My coat still smells like a gas station.

Haha thats funny you say that, i was working on the car today and found that the rear section of the exhaust was not bolted on tight so most of the exhaust wsa leaking into the garage... that explains alot!

Anyway here is the update...I replaced the plugs brand new and gapped themi repalced the o2 sensor and grounded the ecuplugged the BOV spot on intake pipe (correctly)Cut the spring off of the Q45 Throttle body that idles the car up when coldThe car idles PERFECT! I let it get to op temp and tried to rev it and it still fuel cuts like its flooding the engine. At idle the wide band reads 11.2-12.2. Then you rev it and it goes right to rich and maxes outso again we need to know what sensors cause limp mode and check them and the wiring to each (need you help evan for that) I check the power wire to the maf again and it was reading soooo i am kinda lost. Let me know what days are good for you to come by again and help. Thursday is going to be a heat wave at 43 for a high! But anyday works, i still have the heater.

[240z4u]

43? dAAAAmmmnnn

Thursday might work, My buddies truck is getting picked up from my house to go to the mechanic (thank god) for a motor swap. I don't have the time or heat to do it. If the truck gets picked up early enough I would say that should work.

I am a retard and sprayed a power washer directly into my alternator yesterday, so it isn't working. Dumbass...... hopefully Ill have it sorted out tonight.

Ill drop you a text tonight if I get my car working again, and Ill get Ben a message as well and see if that works for him.

I am sure, as everyone has said, that it is something to do with your MAF. Glad it ldles well. Thats big progress.

Evan

[lilskyline240]

yeah for sure just drop me a line and ill see whats up for thursday. I got nothign after 4 most likely. ANd if i do ill be with my girl who would gladly come along to screw with a car lol

[240z4u]

yeah for sure just drop me a line and ill see whats up for thursday. I got nothign after 4 most likely. ANd if i do ill be with my girl who would gladly come along to screw with Evan lol

Haha, thats nice of you to offer but I am engaged! lol

Alright man, ill keep you updated for sure. He works till about 5 so I imagine that time frame should be fine.

Evan

[lilskyline240]

did u change the end of that post just for fun? or did someone actually change it and then change it back? lol

[toadx8u]

he changed it to be stupid...evan is ghey like that

[lilskyline240]

he changed it to be stupid...evan is ghey like that

lol i know