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Thread: Problem with engine

  1. #1
    Join Date
    Aug 2004
    Location
    West Chester, PA
    Posts
    38

    Default Problem with engine

    Hi all,
    I have engine related issues with my 95 525i. Engine is shaking as if something is seized. I used Peake to get the codes, which gave me 45 and 46, knock sensors. Stomp test did not give me anything. I changed both knock sensors and while I was doing that I also cleaned the ICV. I changed the spark plugs, oil, and fuel filter. Air filter is relatively new and looks clean. Coolant was changed 6 months ago and looks good and coolant hoses were changed then. The car never overheats, and temp stays at the same spot as it always was. Belts look good, but I am going to take them off and see something is wrong with pulleys, which does not seem likely. All the hoses look fine. Now there is no code on Peake or stop test.
    I am not sure it did anything, but I used Seafaom in the engine, 1 and 1/2 oz for each quart of oil as directed on the can, and I put the remaining in the gas tank (everything was okay until the gas was almost gone). Since then I am not sure what is going on, but I am having this issue.
    It seems to be worse when the engine gets hot. The water pump is 2 and half years old (it has metal, not plastic).
    What do you guys think the problem could be. The engine never shook like that before, when I tried to accelerate, I feel that something is seizing, as if something is prevented to turn in the engine. But after that, it is similar problem while it is idling too. Upper coolant hose is hot and gets hard. Lower coolant hose also hard and I could not squeeze it when I tried a few minutes ago; is the lower hose supposed to be like that?
    I appreciate if you could help me solve this problem.

  2. #2
    Join Date
    Feb 2004
    Posts
    4,894

    Default

    Change the oil right away... flush out that Seafoam... I don't believe you are meant to drive the car with it in there....

    Fill up the fuel tank to dilute the Seafoam.

  3. #3
    Join Date
    Aug 2004
    Location
    West Chester, PA
    Posts
    38

    Default

    Quote Originally Posted by Tiger View Post
    Change the oil right away... flush out that Seafoam... I don't believe you are meant to drive the car with it in there....

    Fill up the fuel tank to dilute the Seafoam.
    Thanks, I've changed the oil (the oil with the seamfoam has been drained out). The fuel tank has been filled with fresh gas. But the problem did not go away.

  4. #4
    Join Date
    Nov 2006
    Location
    Germany
    Posts
    475

    Default

    Did you stir something up via running the tank almost empty? Doing so does tend to pick up any trash in the tank and either clog the fuel pump strainer and/or the fuel filter.

    The filter is a cheap and easy replacement, especially if you haven't done it in a few years. The pump strainer is more work but may prove equally valuable as you will get to see into the tank and verify it's good to go or not.

    When you did the spark plugs, how'd they look? Were the rubber leads from the coil packs good to go?

  5. #5
    Join Date
    Feb 2004
    Posts
    4,894

    Default

    I'd probably change the fuel filter first. Then I would suspect fuel pump or CPS.

  6. #6
    Join Date
    Aug 2004
    Location
    West Chester, PA
    Posts
    38

    Default

    Quote Originally Posted by bsell View Post
    Did you stir something up via running the tank almost empty? Doing so does tend to pick up any trash in the tank and either clog the fuel pump strainer and/or the fuel filter.

    The filter is a cheap and easy replacement, especially if you haven't done it in a few years. The pump strainer is more work but may prove equally valuable as you will get to see into the tank and verify it's good to go or not.

    When you did the spark plugs, how'd they look? Were the rubber leads from the coil packs good to go?
    Thank you guys. The tank was almost empty when the problem started and I immediately filled it. At a time I thought the problem must be related to fuel since the seafoam was in the tank and the tank was almost empty. Two days ago, I changed the fuel filter. Last summer a new fuel pump was put since the original one died. Do I need to take the fuel pump to get to the strainer?

  7. #7
    Join Date
    Nov 2006
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    Germany
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    475

    Default

    Yes.

  8. #8
    Join Date
    Jul 2006
    Location
    O.C.
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    Default

    Check fuel pressure at the rail-This will ensure fuel pressure is present at the injectors. While in park and engine running rev the engine to 2-4k. Fuel pres. should increase a bit.

    Coolant hoses become hard when the system is hot and under pressure(15 psi)

    Since you added seafoam to the engine oil and fuel system you should attack those systems...Dont both with cooling system, belts, tires, blinkers. You know what you added, look in those areas.

    Do you still have knock sensor codes?? If so you have a misfire most likely. Fuel starvation/Fuel injector leaking/ Spark plug misfire, coil inop, many possibilities. Start eliminating some.
    Last edited by aston_jag_tech; 05-08-2010 at 12:41 PM.

  9. #9
    Join Date
    Aug 2004
    Location
    West Chester, PA
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    Default

    Quote Originally Posted by aston_jag_tech View Post
    Check fuel pressure at the rail-This will ensure fuel pressure is present at the injectors. While in park and engine running rev the engine to 2-4k. Fuel pres. should increase a bit.

    Coolant hoses become hard when the system is hot and under pressure(15 psi)

    Since you added seafoam to the engine oil and fuel system you should attack those systems...Dont both with cooling system, belts, tires, blinkers. You know what you added, look in those areas.

    Do you still have knock sensor codes?? If so you have a misfire most likely. Fuel starvation/Fuel injector leaking/ Spark plug misfire, coil inop, many possibilities. Start eliminating some.
    Thanks. I haven't gotten any knock sensor code since I changed them. Today, I checked the pulleys, which looked okay, but I changed idler pulley, tensioneer pulley, AC pulley and tensioneer, and power steering pulley. I disconnected the battery cables and by connecting them and turning the key to II position, I tried to reboot the car. After starting shaky again, it became smoother and drove about 30 miles, which was good until I was coming home, stopping at lights made the shake come back. Still there is no codes with stomp test and Peake.
    Spark plugs looked fine when I took them off, coils were okay, plug boots looked okay. So it must be fuel related. I tried to rev the engine, it seems it accelerates okay, which I assumed the fuel pressure was okay. Do I need a special tool to check the fuel pressure to know the pressure is increasing?

  10. #10
    Join Date
    Jul 2006
    Location
    O.C.
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    463

    Default

    The new spark plugs look fine? How do you know coils are ok? Did you do a cyl drop out test?(running engine and disconnecting 1 coil at a time to see if the engine changed in roughness or not), You need a fuel pressure gauge(analog). If you have a test port on the fuel rail youll need an adapter to thread onto the test port. Never assume until you know youre actual specs. GL.

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