RB25DET List Of Problems

[Nissan2367]

(Ok so here is the back ground thread... i felt i was thread jacking:zerothread?id=393094Ok so here is the list of problems i am having and list of things i have done to troubleshoot my problems. Problem: Car runs like crap, backfires, and runs VERY richThings I have tested:Coils: Bought liquid electrical tape and recoated entire coils (all work fine)FPR: Bought an Aeromotive FPR and set at 38psi without vacuum attatchedSet Timing Belt: Timed the car dead nuts (Timing Belt Wise)CAS: Checked to make sure the shaft moved freely and the tooth was still on the cam shaft. Only thing i noticed is when the car is running the black dot in the middle of the CAS spins... not sure if thats normal.Boost Leaks: Went through all the Intercooler pipe and no leaks anywhere!Vac Leaks: NONE!MAF: Replaced brand newCoolant Temp: Replaced Sensor Brand NewECU: I would check to codes but none has helped me yet on how to do so...I also switched it with a friends ecu to make sure it was not a problem with mine... did the same thingSo here is my issue, i would love to test my timing with a light but i cant get the car to stay running long enough to do so. My AEM Wideband is pegged at rich and does not lean put unless i rev the crap out of the car which causes large backfires and flames out the exhaust. I am starting to think maybe an ignitor issue or maybe even a wire harness issue. i had the harness done by wiring specialties so i would hope its quality.Any help would really be awesome. I am getting sick of this piece of crap... i know why i went to hondas for 4 years, costs 1/3 and you can go to Walmart and buy parts! Thanks guys

Modified by Nissan2367 at 9:59 AM 1/5/2009
Modified by Nissan2367 at 8:10 PM 2/17/2009

[240z4u]

Are all 6 plugs the same condition?

You sure your coolant temperature sensor is working properly? There is a test deal in the FSM for it.

Evan

[Nissan2367]

I cant get the engine to run long enough to check the plug condition! But how do you check the coolant sensor... i dont have the FSM.I am really starting to think its the ignitor, it runs like it has a misfire and smells like unburnt fuel really bad! I ordered a new ignitor today just for ****s and giggles and we will see where that gets me!I am starting to think this is a common problem for RB's!Thanks for all your help evan!Keith

[240z4u]

Your welcome Keith. I keep forgetting to give you that bootleg disk!

Evan

[Nissan2367]

Yeah that would be awesome! I still need to get you your ecu back! But i may need your help getting this thing running still!You know where i can get another coolant temo sensor? I checked ebay and searched forever! I bought my second one used too... so it might be bad

[240z4u]

Keith, Ill bring the original with me to work tomorrow (if I can remember) call me and come get it. I dont have a functioning burner on my computer.

[Nissan2367]

Alright sounds good evan! I am not sure where ill be for work today but ill try to make time to get over there!So anyone elso have any more ideas???

[Nissan2367]

New update:I pulled the boots off the coils, cleaned the springs, the copper and then wrapped them all in 3-4 layers of electrical tapeSTILL HAVE A MISS!!!The car does not idle when i try to rev it it wont rev past 2500-3k rpm.it runs smoother at high rpm and dies out at lower rpm.i am thinking its missing on 1-3 cylilndersI have no idea what else to do but start dumping money into buying more parts to see if it will finally runi just ordered a Ignitor and will prob order a CAS sometime this or next week. i cant check the timing with a light because it wont idle! WHERE CAN I BUY A COOLANT TEMP SENSOR!?!?I need more help with this but i think i have stumped even the whole forum!

[superduner]

NEVER understimate the power of sparkplug wires :P

best believe it cost my cousin and his SR20det ALOT of money for a dumb and easy fix.

went through the same thing you went to pretty much. backfiring. stuttering and idling problems at low RPM's and decent power on top end.

he sold it because he got tired of the problem....

new owner calls him two days later and tells him " damn this is a powerful car man i got a good deal on it. I just changed the sparkplug wires and it runs like hell let loose" both our jaws dropped.

so the moral of this story.

CHECK THE CHEAP PARTS FIRST. just my two cents bro good luck with the car. dont give up on the engine.

[Nissan2367]

Yeah i know and i think i have checked everything that is cheap and or free! I put on my new ignotor and guess what... no change i guess ill have an extra just like my maf!I hate this engine right now!
Modified by Nissan2367 at 3:22 PM 1/10/2009

[Nissan2367]

Another Update.I pulled out the rail that holds the coils out and coated it also in liquid electric tape. Still runs like crap.Now the engine will run and "idle" a little bit the die off. Its like it cant keep itself running! You can tell its missing on some cylinders and also backfiring out of the intake and exhaust and anything over idle.now the timing (belt wise) is dead nuts perfect, no skipped teeth, nothing.now i am starting to lean twards the CAS but before i buy on i want to know if the S2 and S1 can be swapped. I have a friend here in madison that has a S2 and his CAS is the same i have on my S1... Might be the issue! Just starting to guess now!

[lilskyline240]

y not test each individual cylinder? take your CAS off the cam and each of the coils out of the cylinders and ground them. Then spin the CAS by hand and see if u have spark at each of the coils if you dont u will at least know what cylinders arent firing. SOunds like a CAS or ECU problem to me. Normally the ignitor would let no Coil pack work.

and i just noticed you are in madison. if u want me to come out and help take a look at it i can once it gets warmer again lol

Hey Evan is this one of your friends?

[Darius]

Is the MAF wiring correct and signal wire shielded?

[240z4u]

Hey Evan is this one of your friends?

You don't reach friendship status until you provide me with some adult beverages! lol --- This goes for you too!

Yeah, I loaned him that ECU. I am almost sure that his CAS is shot. I have it in my car. He ran the car for a bit with no upper timing cover. It is somewhat difficult to turn. I am going to try it on my car when its not negative one billion degrees outside.

Evan

[lilskyline240]

isnt his motor a S1 tho? or was i just assuming it was when he thought his ignitor was shot. Cuz then idk how that ecu would work that you borrowed me. but it does sound like a CAS problem.

and next time i come out to mad town ill have to bring ya a bottle lol Last time i came out i wasnt 21 yet lol

[l0nestar]

S1 and S2 CAS's are different. On my S1 CAS, the black Mitsubishi dot in the center does _not_ move.

Do any of you guys (Evan, lilskyline, Nissan) have a consult cable?

[240z4u]

You can use a S2 ecu on an S1 motor.

No consult cable here, power fc!

Evan

[240z4u]

[QUOTE=lilskyline240]

and next time i come out to mad town ill have to bring ya a bottle lol Last time i came out i wasnt 21 yet lol[/QUOTE

Don't worry about it I was just busting your balls!

[Nissan2367]

I dont have a cable but i saw one on ebay like a day ago for like 25-30 bucks! Not a bad deal! And about the bottle... with all the help you have given me i am thinking i owe you a case or more! I always have beer in the fridge!I am hoping the CAS is bad if not i am out of ideas and i will assue the harness is bad ( I would hope not since Wiring Specialties made it)

[240z4u]

Well if they did... well I suppose everyone is human. It happens.

That cas doesn't feel right to me man. Ill get it tested this weekend.

Evan

[pawpaw18_00]

Well if you have flames barking up the intake and backfiring like crazy...i will suggest taking the front cover off and checking the cam timing the belt may be on but if one cam is off tooth car will not idle...i dont want you to spend anymore $$ but go buy an ignition/spark plug checker...plug it in to your coil one at a time and have someone crank the engine...check for spark...my experience with ign miss fires is that it does it more the higher the rpm...Coolant temp sensor will have a certain resistance at a given temp...check out race bread site...they have downloadable FSM...

[240z4u]

Paw Paw, I know he checked that a couple times but who knows at this point.

The CAS is fine, my car runs well with it in. It is very difficult to turn so I do suspect it needs replacement anyway though.

I am also wondering about your MAF sensor wiring itself, it sounds like your car was running like mine was two days ago when my tire ate through the ECU ground reference wire.

Evan

Keith, I don't have time this coming weekend but maybe next I can come over and take a look. During the week might work too.

[l0nestar]

I stand corrected about the CAS / ECU's.

You are such a nice guy, Evan.

[Nissan2367]

Yeah Evan has saved my *** a couple times! But i have checked the belt timing about 5-6 time and pulled the belt and re-set it each time! Its dead nuts perfect (HKS belt has marks to line up with the timing marks)I am really starting to think its a wiring issue, i have ether replaced or checked everyother sensor and it has done nothing. The only one i have not done anything with is the 02

[240z4u]

I am totally confident that I can make that hooptie of yours run next week. Unless its -billion degrees again.

You supply the beer, Ill supply the drunken ramblings.

Evan

[Nissan2367]

All I need to know is what kind and a day and I am in! If its just i missed a plug or screwed something small up i am going to be so pissed and happy all in one!

[pawpaw18_00]

I'd come over too...for the beer but i need a DD...to drive me back to Michigan...haha

[Carl H]

did the driving dog on the exh cam break off and cause missalignment of the cas?

[240z4u]

did the driving dog on the exh cam break off and cause missalignment of the cas?

Carl, he said that is still intact. Ill check tonight!

[lilskyline240]

need an extra set of hands and another RB motor to compare stuff to? cuz im always game to get another RB running