Announcement

Collapse
No announcement yet.

Buzzing main relay?

Collapse
X
Collapse
 
  • Page of 1
  • Filter
  • Time
  • Show
Clear All
new posts
Previous template Next
    #1

    Buzzing main relay?

    Okay so I'm new here. I have and 85 325e, I think I've posted once before not much happened in response but still got good feedback. So I got an e30 that wasn't running that fusible link was blown and in tank fuel pump was bad. So I replaced both still got nothing after weeks of frustration I took it to a shop the main fuel pump was bad so got that replaced as well as the main relay. The shop couldn't really figure it out either they were throwing parts at it

    So as of then new parts in car
    Battery
    Fusible link
    Fuel pump relay
    Main relay
    In tank fuel pump
    External fuel pump
    The cps and speed sensor


    Okay so I get it running decent enough well the shop does 😁. I have it running decently for a few weeks so I was like hmmmm suspension and brakes so I replaced pads and rotors and after seeing how bad my suspension looked doing that I ordered coil overs finally got those in, replaced both control arms, control arm bushings, outer tie rods. All said and done just over $1000 in suspension and more than enough else where.
    So the day after I get the suspension on I have to drive it to work and halfway there it poops out. And won't start again. So I tow it home and just because I had a fuel filter for it laying around so I replaced it that was a really PITA.
    I am getting spark I shocked myself to find out 😂. So I pulled the fuel line off right before the fuel pressure damper and had a buddy crank it and fuel was shooting everywhere so I bypassed the damper thing with some high pressure fuel line and it isn't even coming out of that hose now.
    Oh and the main relay is buzzing? I know the icv is supposed to buzz but it's the main relay, if you touch it it vibrates from buzzing. Is this normal?
    Oh and I tried a different dme as well

    So my trouble shooting thus far is
    Both fuel pumps work I ran 12V directly to them.
    New fuel filter
    Bypassed the fuel pressure damper
    I do have spark
    Different dme
    Charged battery
    New alternator(happened because battery wasn't holding a charge not because of this needs a new belt though)
    It is cranking and it wants to start but no fuel...
    Also yes there is power to the in tank fuel pump
    Fusible link =👍
    Different fuel pump relay

    So questions are
    Can I jump my main relay to start by running wires between pins 30, 87, 87a or b?
    Why would it give fuel one day by cranking but not the next unless it is a kinked line?
    I have another car I just want this thing to be running well😭
    Tags: None
    #2
    did you figure it out.

    Comment

      #3
      Originally posted by SecludedPlayer2 View Post
      did you figure it out.
      Ummmm no still a hovercraft....

      Both fuel pumps working my fuel pulse damper (I think it's called) was clogged it's not necessary so I removed it. Put fuel injection hose in its place and then I wasn't getting fuel to that point which before I was....

      Soooooo my thoughts are my pump is buzzing so it works but fuel isn't getting there apparently I'm soooo confused

      But as to the relay I replaced with k3 and it stopped so probably a bad relay which I just had replaced at a shop so it should be under warranty.

      Any one have any ideas?

      Comment

        #4
        can you unhook the fuel line before it goes into the fuel rail and then just jump the fuel pump relay.

        Comment

          #5
          Originally posted by SecludedPlayer2 View Post
          can you unhook the fuel line before it goes into the fuel rail and then just jump the fuel pump relay.

          Yeah I did directly after the external fuel pump after I removed the damper thingy and it was then I bypassed the damper and it wasn't. So I was thinking possibly pinched line but I checked an drew nope.

          And now when crank and then go to on I can hear the fuel pumps running and feel the gas enter the filter... due to the pressure it kinda vibrates

          Comment

            #6
            If fuel pumps have power and no lines are pinched and fuel is in the tank and still no fuel really only explanation is:
            reversed polarity
            impellors for fuel pump broken
            something stopping impellors for fuel pump
            something is clogging the lines/pump
            fuel lines hooked up wrong
            fuel pump seized

            I would suggest retracing your steps to include disconnect and reinstall, hope it helps.

            Comment

              #7
              Originally posted by SecludedPlayer2 View Post
              If fuel pumps have power and no lines are pinched and fuel is in the tank and still no fuel really only explanation is:
              reversed polarity
              impellors for fuel pump broken
              something stopping impellors for fuel pump
              something is clogging the lines/pump
              fuel lines hooked up wrong
              fuel pump seized

              I would suggest retracing your steps to include disconnect and reinstall, hope it helps.
              That's the plan this weekend, I pulled the upper timing cover off checked the timing belt which was in decent condition and obviously I'm getting timing data because the fuel pumps are running when I crank. I changed spark plugs all the ignition components are new now. And it's definitely getting spark. Sooooo fuel it was running lean before and had a hard start issue but my in tank pump did burn up on the highway

              So this far the problems I've fixed for this go round is
              Filter
              Bypassed damper
              Replaced intank fuel pump with extra I had laying around so it's probably broken... knowing my luck
              Replaced main relay with k3
              Replaced fuel relay

              So next step pull the lines to the external fuel pump see if fuel is getting that far
              If not it's the in tank
              If it is see if it's getting passed the external if not there's the problem

              But here's my biggest concern I've found nothing on it and I search everyday...
              the fuel filter the line going filter -> engine goes to the rear side of the fuel rail... which I'm used to being the return side especially with the FPR being mounted on the front so any advice there? Hopefully it's just swapped lines or something

              Comment

                #8
                I've replaced fuel pumps in the past and had the wires come loose after installing it just to spend countless hours figuring out I didn't hook them up securely. Stuff happens, hope you the best of luck tracing down your problem. Not saying you did anything wrong just thought I would throw that out there.

                Comment

                  #9
                  Okay so now I've checked:

                  Injectors had them cleaned
                  Removed intake manifold
                  Spark plugs new
                  Cap and rotor new
                  Battery new
                  Alternator new
                  Different ecu
                  Different relays have some more to try tomorrow

                  Troubleshooting got me this far now
                  The fuel pumps were running with one relay now they aren't unless I jump it.
                  However still won't crank with fuel pump relay jumped
                  Starts briefly with starter fluid


                  Any ideas I'm completely lost.....

                  Comment

                    #10
                    Put everything to stock as it should be, no jumping things.

                    1. Verify (again) that you have spark while cranking.
                    2. Pull the fuel line going to the rail (not the return off the fuel pressure regulator) and crank, see if it's shooting fuel. (put the hose into a bottle.)
                    3. If no fuel, go to pumps and crank, see if they're running. If they are, going forward in your lines until you find what the issue is.
                    4. If the fuel pumps aren't running, go forward with the electrical (use a multimeter).

                    Does anyone know what pin(s) control fuel off the DME?
                    AWD > RWD

                    Comment

                      #11
                      Originally posted by Kershaw View Post
                      Put everything to stock as it should be, no jumping things.

                      1. Verify (again) that you have spark while cranking.
                      2. Pull the fuel line going to the rail (not the return off the fuel pressure regulator) and crank, see if it's shooting fuel. (put the hose into a bottle.)
                      3. If no fuel, go to pumps and crank, see if they're running. If they are, going forward in your lines until you find what the issue is.
                      4. If the fuel pumps aren't running, go forward with the electrical (use a multimeter).

                      Does anyone know what pin(s) control fuel off the DME?

                      1. I will have to do that today as well as a compression test maybe tomorrow I have lots of things going on at the moment.
                      2. I do have fuel if I jump the relay they were running without that before. So I have a new fuel pump relay and main relay.
                      I was trying to test for continuity between DME connector and injector connectors but my multimeter doesn't do continuity apparently. To check the harness but when I did test for power at the injectors I had 10V on one and 11V on another
                      Using a diode tester nothing happened I swapped the DME and got the faintest of light.
                      I honestly believe the harness is bad but I can't really test that without a continuity tester.

                      Comment

                        #12
                        Okay so compressions test reveals
                        110 on cylinders 1 and 5
                        120 on the rest
                        And a spark test reveals no spark... again...

                        I just paid $1000 dollars to get this thing running and I get 50 miles on it
                        So if no spark and no fuel then the cps is bad but it's literally brand new I'm gonna call the shop and tell them hopefully it has a warranty

                        Comment

                          #13
                          Got it started!!!!!!!!!!!

                          It was relays I think I put a new battery in since mine was dead probably because it hasn't been able to charge in a month and half except off jumper cables sooooooooo i ordered new fuel pump and main relays put them in and checked for spark and got nothing so I was like eh I'll try it anyway it turned over slowly
                          Like 1 rotation per second it then caught started turning over quick and started right up.
                          I ran it for like 10seconda since the cooling system is out but when I went to crank it again a few minutes later it didn't start but after about 2 more minutes it turned over extremely slowly again and then fired right up. But had a rough idle
                          Any ideas about what that could be
                          About starting the idle I'm not to concerned about right now.

                          Comment

                          Previous template Next
                          Working...
                          X