Results 1 to 6 of 6

Thread: 1977 280z w/ MSII, rough idle, sneezes, and wont accelerate

  1. #1
    Registered User
    Member ID
    CZCC-30328
    Join Date
    Apr 2014
    Location
    Ridgefield, WA
    Age
    25
    Posts
    5

    Exclamation 1977 280z w/ MSII, rough idle, sneezes, and wont accelerate

    Hello, my baby is having trouble idling and accelerating. I just recently installed MS2 in her so I could surpass the issues I was having with the electrics. However, the problems I was having before are almost the same as the problems now. A very rough idle and no acceleration in the rpm.
    I have replaced the coil, distributor, plugs, plug wires, fuel filter, ECU (to MS2), and the fuel regulator. I hooked the distributor up to my laptop and the board and spun it around with a drill and got rpm on the screen, so I think that works. The coil is working too because cranking it over unhooked give plenty of spark. I did a check on the fuel pressure after the fuel filter and got 37psi with the ignition on (the pump wont shut off when the car is on on, not start.. Maybe some feedback with this too please? I know it needs to be linked to the MSII board) while cranking it over I received 34-35psi so I ruled fuel pressure out... I know the plugs get spark because after the initial cranking the car will run for 30 seconds perfectly (from the CSV) then start to idle rough then die. That is, IF the car starts. Sometimes it just cranks over and doesn't start.. instead what happens is a big sneeze and puff of white smoke pours from the intake, along with some oil from the PCV system.
    Another thing that isn't up to shape is the tach, which doesn't work anymore... which I think should be hooked up to the negative side of the coil but has decided that it doesn't like the new coil or the new EFI system...
    I have many issues... Maybe an enthusiast who knows their way around these systems can lend a helpful hand! Thanks!
    1977 Datsun 280z
    1950 Chevy Pickup Hotrod

  2. #2
    Registered User madkaw's Avatar
    Member ID
    CZCC-7622
    Join Date
    Dec 2004
    Location
    bloomington IN
    Age
    58
    Posts
    2,288

    Default

    I have MS3 on my Z. Don't have time right now to help- if I can, but you should be posting on Hybridz if you haven't already
    Steve
    71 240z,bw-5sp 2.4-40 over,balanced,e-88,big valves,ported&polished, stage2,header, triple Mikuni's 40's
    3.90 Subaru STI LSD

  3. #3
    Low Budget/High Value
    Member ID
    CZCC-20342
    Join Date
    Oct 2009
    Location
    Washington County, OR
    Posts
    3,629

    Default

    I notice that you haven't mentioned your fuel map at all. Makes me think that you may not understand exactly how Megasquirt works. It doesn't adjust itself, you have to give it the right starting point, then tune it from there. It takes quite a bit of work to get it tuned right.

    Have you been on the DIY site? Spend some time here - https://www.diyautotune.com/faq/faq.htm
    1976 280Z, with some minor modifications

  4. #4
    Registered User siteunseen's Avatar
    Member ID
    CZCC-24724
    Join Date
    Jul 2011
    Location
    Alabama
    Posts
    1,967

    Default

    The MS II didn't fix the problems you had in the beginning? You've replaced a lot of stuff and it hasn't helped, I did that too.
    For mine the biggest thing was a huge rotted hole under the intake at the back, windshield, where the EGR is. Get a mirror and look under there.
    The 2nd thing was putting a potentiometer in the coolant temp sensor circuit.
    http://atlanticz.ca/zclub/techtips/t...pot/index.html
    1972 240Z #918 New Sight Orange
    1977 280Z #305 Light Blue Metallic
    1972 240Z #110 Persimmons Red

  5. #5
    Registered User
    Member ID
    CZCC-30328
    Join Date
    Apr 2014
    Location
    Ridgefield, WA
    Age
    25
    Posts
    5

    Default

    Ive adjusted my VE, Spark Advance and my AFR tables. I know the basics but I ain't no expert haha. Ive been through TunerStudio top to bottom and then researched everywhere. Twice. I'll keep tuning though! Thanks!
    1977 Datsun 280z
    1950 Chevy Pickup Hotrod

  6. #6
    Registered User
    Member ID
    CZCC-30328
    Join Date
    Apr 2014
    Location
    Ridgefield, WA
    Age
    25
    Posts
    5

    Default

    Yeah, I really just wanted to get rid of the old EFI system. I was hoping the new system would help get rid of the original problems I was having... but that clearly worked out well. Another thing to mention is most of those parts were bought and installed before I installed MS2. So I got no where with the old system. But thank you for the input! I will check for holes near the EGR and Ill check the Coolant Temp Sensor with my potentiometer.
    1977 Datsun 280z
    1950 Chevy Pickup Hotrod

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. 1977 280z with MSII no voltage at coil
    By ZDrummerGuy in forum Electrical (S30)
    Replies: 1
    Last Post: 08-29-2014, 03:42 AM
  2. Rough idle in a 76 280z automatic
    By saridout in forum Engine and Drivetrain (S30)
    Replies: 39
    Last Post: 03-11-2009, 03:43 PM
  3. 78 280z Rough Idle When Hot!
    By Bored_Rice in forum Help Me !!
    Replies: 18
    Last Post: 03-05-2009, 02:29 AM
  4. 1977 Z Rough idle and more!
    By martym in forum Help Me !!
    Replies: 7
    Last Post: 09-12-2006, 12:16 AM
  5. 75 280z rough idle
    By jtros in forum Help Me !!
    Replies: 2
    Last Post: 09-30-2002, 04:08 PM

Tags for this Thread

Bookmarks

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •