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Thread: Just another boring LS swap into an E36 M3

  1. #501
    Join Date
    Apr 2012
    Location
    Florida
    Posts
    68
    My Cars
    2008 M5
    Got to be a great feeling when it moved under its own power...

    Can't help you much on the issue: obviously pressure at 70+ will make the engine run rich...fouled plugs? Did a wire come loose/chaff thru with a few miles on it?

  2. #502
    Join Date
    Sep 2015
    Location
    Brighton, MA
    Posts
    580
    My Cars
    1997 M3/LS1, 01 Prelude
    Quote Originally Posted by Tim Mc View Post
    Got to be a great feeling when it moved under its own power...

    Can't help you much on the issue: obviously pressure at 70+ will make the engine run rich...fouled plugs? Did a wire come loose/chaff thru with a few miles on it?
    I was pumped to drive it, a lot better than looking at it on jackstands for the past year plus. Couldn't beat on it too much with the fresh clutch, but it feels like it's going to be a ton of fun.

    I haven't pulled a plug yet, working on the side of the road in the city with a little pouch of tools at this point. Wire chafing somewhere in the harness is a distinct possibility, especially since it seems like it takes a few minutes for the car to start acting up, which would fall in line with a damaged wire heating up and creating resistance.
    Instergrams: @davemakepictar

  3. #503
    Join Date
    Mar 2004
    Location
    USA
    Posts
    3,080
    My Cars
    96 328is 6.0L
    Highly doubt you will get MAF code on bad fuel, plus it won't just randomly shut off. It would've ran like crap all the time.

    If you get code on MAF, try unplugging the MAF and drive around see if it repeats with MAF unplugged. Also, try connecting OBDII reader with live data to see if your MAP is still alive and shows reading after being connected to oil pressure switch. Both MAF and MAP are somewhat related and could be your issue.
    - 96 328is 6.0L. (LS1 to LS2 build thread: http://forums.bimmerforums.com/forum...ad.php?2098938)
    - 96 328is 5.7L. (LS1 build thread: http://forums.bimmerforums.com/forum....php?t=1289987)
    - 95 ///M3 6.0L. (LS2 build thread: http://forums.bimmerforums.com/forum....php?t=1619249)

    - 97 ///M3. (e46 Fender Flares/track car build thread: http://forums.bimmerforums.com/forum....php?t=1727098)
    - 96 328is (Dual Fuel Pump to Surge Tank thread: http://www.bimmerforums.com/forum/sh...ad.php?1964025)

  4. #504
    Join Date
    Sep 2015
    Location
    Brighton, MA
    Posts
    580
    My Cars
    1997 M3/LS1, 01 Prelude
    Quote Originally Posted by bimerok View Post
    Highly doubt you will get MAF code on bad fuel, plus it won't just randomly shut off. It would've ran like crap all the time.

    If you get code on MAF, try unplugging the MAF and drive around see if it repeats with MAF unplugged. Also, try connecting OBDII reader with live data to see if your MAP is still alive and shows reading after being connected to oil pressure switch. Both MAF and MAP are somewhat related and could be your issue.
    Car died after 10-15 seconds without the MAF the other day, but it was after it had started dying, not when it was cold.

    I went to the JY today and got a MAF off a known good engine. Symptoms didn't change, still started having issues after 10 or so minutes today when driving around in low gears.
    Instergrams: @davemakepictar

  5. #505
    Join Date
    Sep 2015
    Location
    Brighton, MA
    Posts
    580
    My Cars
    1997 M3/LS1, 01 Prelude
    The saga continues, cross posting this from LS1tech, sorry if this repeats some older info.

    Car appears to be running very rich to the point where it seems like the engine is flooding. It will run okay for a bit, then start to bog. Pulled the plug on cylinder 1 and it was very dark and slightly wet. Had a P1635 code, checked 5v reference at the MAP, oil pressure, and fuel tank pressure, and all checked out- I did not have A/C flashed out of the PCM when I got my base tune, and I'm guessing this code is lingering because I do not have the A/C nor the pressure sensor set up. I checked O2 sensors, and unplugging the sensors does not change how the car runs, nor does it trigger a CEL. Measuring the wires on the harness side with a voltmeter shows both the tan and purple wires putting out 4.6-4.9v. I unpinned one of the tan wires at the PCM and checked again with key on power, and the voltage disappeared.

    Any thoughts? Here's the plug.
    Last edited by squashman702; 06-21-2017 at 09:29 PM.
    Instergrams: @davemakepictar

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