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420A Brian crower cams p0300

Posted by ShonDope, Oct 27, 2019

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  1. ShonDope

    ShonDope Proven Member

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    Has anyone had any issues with a p0300 code after installing the Brian crower stage 2 cams? I’ve replaced everything but the ECM and it just won’t go away. I also have an issue with my car stalling when I go to a stop. It’s not all the time, but it’s almost like it chokes but I’ve replaced the IAC. I’ve reset my timing and replaced the components 3 times already so I know it’s not a timing problem. Please help me! 99 eclipse rs
     
  2. BLACK'98DSM

    BLACK'98DSM Proven Member

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    Usually when doing cam work you will need a tuning solution. Since you replaced both cams with stage 2's I wouldn't expect the car to run perfectly until you tune it.

    I have only an exhaust cam and my engine has its little problems since I haven't tuned it.

    You say you haven't replaced the ecu, do you have Megasquirt? Or have you played with the OBDII at all?


    Oh, and how's your timing? Do you have adjustable cam gears? Stock ones?
     

    Road Race Build 3K  10  25

    1998 Mitsubishi Eclipse N/T
    fwd · manual · 2G DSM

    127  3

    2008 Tomberlin Crossfire 150R
    rwd · manual · Misc Vehicles

    167  6

    2008 Tomberlin Crossfire (325 swapped)
    rwd · manual · Misc Vehicles
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  3. ShonDope

    ShonDope Proven Member

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    I have stock cam gears and a stock ecu. I was hoping I wouldn’t have to buy a mega squirt just for the cams. How do I play with the OBDII?
     
  4. BLACK'98DSM

    BLACK'98DSM Proven Member

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    Dyno tuning.

    Due to the nature of the stock ecu and stock parts, you can't do much tuning with it. You might be able to make the car run ok, but I would plan for a Megasquirt in the future. Especially if you want to do any more internal mods.
     

    Road Race Build 3K  10  25

    1998 Mitsubishi Eclipse N/T
    fwd · manual · 2G DSM

    127  3

    2008 Tomberlin Crossfire 150R
    rwd · manual · Misc Vehicles

    167  6

    2008 Tomberlin Crossfire (325 swapped)
    rwd · manual · Misc Vehicles
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  5. BLACK'98DSM

    BLACK'98DSM Proven Member

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    Also I recommend a wideband 02 and gauge. It will help with your tuning.
     

    Road Race Build 3K  10  25

    1998 Mitsubishi Eclipse N/T
    fwd · manual · 2G DSM

    127  3

    2008 Tomberlin Crossfire 150R
    rwd · manual · Misc Vehicles

    167  6

    2008 Tomberlin Crossfire (325 swapped)
    rwd · manual · Misc Vehicles
    Loading...
  6. ShonDope

    ShonDope Proven Member

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    I thought you couldn’t tune the stock ecu at all?
     
  7. BLACK'98DSM

    BLACK'98DSM Proven Member

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    Probably not enough for cams.

    What you can really do is view the live data and figure out what needs adjusting.
     

    Road Race Build 3K  10  25

    1998 Mitsubishi Eclipse N/T
    fwd · manual · 2G DSM

    127  3

    2008 Tomberlin Crossfire 150R
    rwd · manual · Misc Vehicles

    167  6

    2008 Tomberlin Crossfire (325 swapped)
    rwd · manual · Misc Vehicles
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  8. BLACK'98DSM

    BLACK'98DSM Proven Member

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    Are cams the only modification you've done to the engine?
     

    Road Race Build 3K  10  25

    1998 Mitsubishi Eclipse N/T
    fwd · manual · 2G DSM

    127  3

    2008 Tomberlin Crossfire 150R
    rwd · manual · Misc Vehicles

    167  6

    2008 Tomberlin Crossfire (325 swapped)
    rwd · manual · Misc Vehicles
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  9. ShonDope

    ShonDope Proven Member

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    Ya I replaced the cams and the springs but the pistons and everything are stock
     
  10. silvreclips

    silvreclips Proven Member

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    You can't reflash the stock ECU, but you can tweak the fueling some with a piggyback system. Something like a SAFC. It just tricks the ECU into adding or subtracting fuel. You would have to look at fuel trims to see what the ECU is trying to do with your fueling to know if you need to make changes.

    But honestly, I don't think that's your problem. Cams alone shouldn't cause stalling problems. Some do experience misfire codes with large cams but the stalling seems strange to me.
     

    Autocross Build 559  1

    1998 Mitsubishi Eclipse N/T
    fwd · manual · 2G DSM
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    BLACK'98DSM likes this.
  11. ShonDope

    ShonDope Proven Member

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    I know my ecu is trying to cut fuel. It’s been running at around -20 for my long term fuel trim at idle and my spark advance switches between advancing and retarding. It doesn’t retard much but every 15 seconds or so it’ll go about -1.8g
     
  12. BLACK'98DSM

    BLACK'98DSM Proven Member

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    Have you read through the causes and symptoms list of this code? That'd be the first place to start.

    This is the reason why everyone who plans to actually buid their 420a needs Megasquirt.

    Here is some info. Courtesy of dsmtalk.com
    Screenshot 2019-10-28 at 10.49.26 AM.png
     

    Road Race Build 3K  10  25

    1998 Mitsubishi Eclipse N/T
    fwd · manual · 2G DSM

    127  3

    2008 Tomberlin Crossfire 150R
    rwd · manual · Misc Vehicles

    167  6

    2008 Tomberlin Crossfire (325 swapped)
    rwd · manual · Misc Vehicles
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  13. ShonDope

    ShonDope Proven Member

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    I’ve replaced everything on the list except for my ecu
     
  14. BLACK'98DSM

    BLACK'98DSM Proven Member

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    Somebody else's input would be nice on what I think: Maybe these cams are not working well with your camshaft position sensor?
     

    Road Race Build 3K  10  25

    1998 Mitsubishi Eclipse N/T
    fwd · manual · 2G DSM

    127  3

    2008 Tomberlin Crossfire 150R
    rwd · manual · Misc Vehicles

    167  6

    2008 Tomberlin Crossfire (325 swapped)
    rwd · manual · Misc Vehicles
    Loading...
  15. ShonDope

    ShonDope Proven Member

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    I just don’t understand why though. These are the most popular cams for these cars and I’ve even replaced the camshaft sensor. Although I did notice oil in between the sensor and the pickup. Is that normal?
     
    BLACK'98DSM likes this.
  16. BLACK'98DSM

    BLACK'98DSM Proven Member

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    There's oil in mine too. And I'm not throwing a code.

    I guarantee you the problem here is very simple. You just have to narrow down the options to find exactly what it is. If you feel like you've done everything, do it again. You are missing something here.

    Just curious, have you ever done a compression test on this engine before?
     

    Road Race Build 3K  10  25

    1998 Mitsubishi Eclipse N/T
    fwd · manual · 2G DSM

    127  3

    2008 Tomberlin Crossfire 150R
    rwd · manual · Misc Vehicles

    167  6

    2008 Tomberlin Crossfire (325 swapped)
    rwd · manual · Misc Vehicles
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  17. ShonDope

    ShonDope Proven Member

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    No I haven’t done a compression test yet
     
  18. BLACK'98DSM

    BLACK'98DSM Proven Member

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    I'm doubtful compression is the problem, but It will not hurt to check.
     

    Road Race Build 3K  10  25

    1998 Mitsubishi Eclipse N/T
    fwd · manual · 2G DSM

    127  3

    2008 Tomberlin Crossfire 150R
    rwd · manual · Misc Vehicles

    167  6

    2008 Tomberlin Crossfire (325 swapped)
    rwd · manual · Misc Vehicles
    Loading...
  19. BLACK'98DSM

    BLACK'98DSM Proven Member

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    You said you've replaced everything? So that includes:
    - plugs
    - plug wires
    - coil pack
    - 02 sensors
    - fuel injectors
    - camshaft position sensor

    Is this correct?
     

    Road Race Build 3K  10  25

    1998 Mitsubishi Eclipse N/T
    fwd · manual · 2G DSM

    127  3

    2008 Tomberlin Crossfire 150R
    rwd · manual · Misc Vehicles

    167  6

    2008 Tomberlin Crossfire (325 swapped)
    rwd · manual · Misc Vehicles
    Loading...
  20. ShonDope

    ShonDope Proven Member

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    Ya I’ve also replaced the fuel filter, fuel pressure regulator and the crankshaft sensor
     
  21. BLACK'98DSM

    BLACK'98DSM Proven Member

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    You mean the crank angle sensor?
     

    Road Race Build 3K  10  25

    1998 Mitsubishi Eclipse N/T
    fwd · manual · 2G DSM

    127  3

    2008 Tomberlin Crossfire 150R
    rwd · manual · Misc Vehicles

    167  6

    2008 Tomberlin Crossfire (325 swapped)
    rwd · manual · Misc Vehicles
    Loading...
  22. ShonDope

    ShonDope Proven Member

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    Ya the crankshaft position sensor
     
  23. BLACK'98DSM

    BLACK'98DSM Proven Member

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    Sounds like you are just replacing a bunch of parts instead of actually diagnosing the problem. This happens too often, everyone seems to do it. This pretty much never works, and puts people out more money than they have to spend.

    Try resetting the code. Pull both the battery cables and let it sit for 10 minutes this way everything can reset. Drive it, and see if it comes back on.

    The three causes of misfire are:
    - no fuel in cylinder
    - fuel not igniting
    - improper timing

    For an engine to run correctly you need:
    - fuel
    - spark
    - compression


    Once you have verified everything here then you should have found your problem. If not, report back with some news.

    - Solomon
     

    Road Race Build 3K  10  25

    1998 Mitsubishi Eclipse N/T
    fwd · manual · 2G DSM

    127  3

    2008 Tomberlin Crossfire 150R
    rwd · manual · Misc Vehicles

    167  6

    2008 Tomberlin Crossfire (325 swapped)
    rwd · manual · Misc Vehicles
    Loading...
  24. ShonDope

    ShonDope Proven Member

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    Most of the parts were old and worn out anyway so I replaced them. I’ve reset the code and pulled the battery cable already. I even replaced the battery terminals to make sure there was a strong connection. I can post some pictures tomorrow of my live data
     
  25. ShonDope

    ShonDope Proven Member

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    Also I just tested the resistance of my brand new coil pack. It’s at 4.4 ohms for the primary coils. Isn’t it supposed to be less than 1 ohm?
     

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