Jump to content
SAU Community

RB20DET: Misfiring Problem

tN^

By tN^,
in General Maintenance

 Share

Recommended Posts

tN^ Enthusiast

tN^

Posted
Posted

ok, when my car starts in the morning, it runs on all six cyclinder and she goes sweet but as I drive it around and warm it up and it begins to misfire and runs on 5 cyc. It sounds horrible like a combi van. It does this everytime in the morning, and its a on and off thing. Now i've changed the spark plugs, and fiddle around with the coilpact. I suspect one of the coilpack has gone kaput. Any opinions on this problem would be apprieciated. I've performed a diagnostic test and the ecu said there's nothing malfunctiong (trust the ecu:mad:)

Link to comment
https://www.sau.com.au/forums/topic/17906-rb20det-misfiring-problem/
Share on other sites
blind_elk Grand Master

blind_elk

Posted
Posted

A quick test:

once the engine is warm and misfiring, whip out the ignition module and stick it in the freezer for a few minutes. Then re-connect it. If the engine doesn't misfire, then its probable the module is faulty. (they only get the fault when hot)

46n2 Mentor

46n2

Posted
Posted

It could be a number of things...I went through a long and painful test process with my 32's misfire. I ended up taking it to a mechanic who had the software to Datastream the ECU, and then they could tell me exactly what was wrong. Try contacting Nissan Service - word of mouth tells me that only Nissan, and very few workshops have this software, but for the pain you'll save - it's worth it. It only cost me about $100 to datastream my 32.

Michael

Guest ameddick

Guest ameddick

Posted
Posted

I rekon the ignition module is the problem. I had the exact same issue. Fixed it only last week. Works fine now. Best way to test is if you can grab one of your friend’s modules.

Where is it? It is on top of the motor, right at the back near (the windscreen end). It is black or silver (depending on the way it is mounted). It has two plugs on it and 4 screws. Take them off and it comes straight out. Easy!!! Makes a good paperweight!!!

BTW can anyone tell me the proper way to mount the ignition module? Is it black side up or silver side up? We have 4 32s in our group each mounted differently.

\\\Wiktor Enthusiast

\\\Wiktor

Posted
Posted
Originally posted by tN^

Ok guys, I just came back from doing the freeze test. The result is no difference: it still misfiring. This is when its already misfiring when I drove it around. Could be coilpack you would say?

Yes it´s the only thing you have left if you havent blown your headgasket between two cyl's. or an extremly bad ign. plug.

Wiktor

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • f00stx
      Quieter performance exhausts (or muffler add-on options)

      By f00stx · Posted

      So, I've had my V36 for about a month now and have already copped an "excessive exhaust noise" notification from QLD TMR, reported by someone in my local area. It's a twin as per the original, and can have a bit of a throaty note to it when idling cold 😄 and if I do get up it a bit, it can be noisy, but it did pass a roadworthy inspection before sale, so.... ... but in the interest of being a good neighbour, I do want to quieten it down a bit. Is anyone here running a quiet aftermarket cat-back on their V36 or 370Z? And the big, bold question: does an aftermarket cat-back really make much of a performance difference on these cars?
    • GTSBoy
      New kid on the block

      By GTSBoy · Posted

      The wiring diagram for the R33 RB25 is freely available, and is essentially the same same as most other RBs (just with differences as to which pin # does which job). To get the ECU to power up, you just need to provide power to the ECCS relay, and have the other power feeds that come in from the top left of the wiring diagram (wrt the ECU) that give perma power to the fuel pump relay, the ECU itself, etc etc, all connected. When you put power on all these it will just come to life. It's pretty clear from the diagram what needs to happen. Just follow the lines from the 12V + supply stuff in the top left over towards the ECU. I've even posted snips of such diagrams (not for vanilla 25, I think for Neo and 26) to various threads here in the last few months, talking about what it takes to get the fuel pump and FPCM up and going. Search these up and they will help get you started on doing the same with the vanilla 25 diagram. Hell, for all I know, I've done the same with that one in years past and have forgotten.
    • Duncan
      New kid on the block

      By Duncan · Posted

      Yep...so unless someone posts up the answer you will need to probe from the ECU connector to the dash plug with a multi meter in continuity mode to trace the wires.  Note the ECU has multiple - and + (and across different key settings - Battery, IGN and Start) and most likely the power is fed from the connector(s) that is normally near the left hand headlight.
    • Songo
      New kid on the block

      By Songo · Posted

      Thanks Duncan, I am actually just trying to get the Rb turning and running with the RB25DET S2 original loom itself  I am just trying to get it going outside the body and not thinking about the S15 or trying to match anything to the S15 loom at all I am only trying to see if anyone has done this and what pin they found to be the ignition trigger and ECU+/- on the dash connector, that's about it. Thanks  
    • iain_ST44GA
      M35 VQ25DET starter motor

      By iain_ST44GA · Posted

      Hi Guys, Does anyone know any aftermarket part numbers for a starter motor to suit the VQ25DET? I can find lots of alternative part number for the VQ35DE, which I assume would fit, but there is a lot of conflicting information out there. Thanks..
×
×
  • Create New...