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Thread: New Engine M30

  1. #1
    Join Date
    Aug 2004
    Location
    Dubai
    Posts
    834

    Default New Engine M30

    Hi all, I just got my car with a new engine, the old one was really old moreover it seems to have a crack that makes it a waste of time saving it.
    the new engine is a 91 model latest M30 and maybe the last. it's really clean and it runs silently. the thing that bothers me that it lacks power. the old engine had way better performance with average compression around 8lbs. I still didn't check the new engines compression and I have 7 other days to test it before the warranty is over.

    any idea what's going on? would it be valve adj. or bad injectors? I need quick advice before I decide on keeping this engine.

    P.S. this is a second hand engine from a trashed car imported from Japan.

  2. #2
    Join Date
    Dec 2004
    Posts
    130

    Default

    I can relate to that problem , my 1991 535i feels weaker than my 1989 535i, I don't know why, plus I have a ticking problem that I can't figure out what it is.

  3. #3
    Join Date
    Nov 2005
    Location
    Blackpool
    Posts
    79

    Default

    Quote Originally Posted by Dan-ny-m398
    I can relate to that problem , my 1991 535i feels weaker than my 1989 535i, I don't know why, plus I have a ticking problem that I can't figure out what it is.
    a problem i had was a hole in the exhaust gasket, made a very annoying ticking sound

  4. #4
    Join Date
    Dec 2004
    Posts
    130

    Default

    Quote Originally Posted by cschollum
    a problem i had was a hole in the exhaust gasket, made a very annoying ticking sound
    THat could be my problem too, since I adjusted the valves about 4 times, changed all the excentrics, switched to fully sintetic oil and the ticking is still there.

  5. #5
    Join Date
    Nov 2005
    Location
    Sarasota, FL
    Posts
    160

    Default

    The injectors can tick quite a bit as well, especially if they are the originals.
    91 535iA M30 Auto
    Born in 3/91 (The Bimmer, not me )

    120,000 Miles
    Pics soon--she is a work in progress

  6. #6
    Join Date
    Dec 2003
    Location
    Eastern Tennessee USi
    Posts
    14,839

    Default

    what is the horse power between the 2 engine years?
    95 E34 530I V2.37
    ===========
    Those who make peaceful revolution impossible will make violent revolution inevitable.

    John F. Kennedy

  7. #7
    Join Date
    Dec 2003
    Location
    Wellington,New Zealand
    Posts
    3,868

    Default

    you sure it doesnt just "feel" slower cos its quiet and smooth?
    Gone but not forgotten

  8. #8
    Join Date
    Dec 2004
    Location
    Sydney, Australia
    Posts
    4,374

    Default

    Definately check the compression, then after that leaks in the intake and as you well know, that damned AFM... also; adjustment of the throttle cable makes a car feel remarkably different- are you getting to WOT?

    Join the Aussie
    540i LE yahoo forum

    08/88 535i e34 M30+miller MAF, 'stiens, tints & teeth!

  9. #9
    Join Date
    Feb 2006
    Location
    tempe
    Posts
    293

    Default

    what about secondary stuff plugs wires cap rotor. also it could be the timing is off. hopefully your compression is good that would be a bad day if you had leaks. how many miles are on the engine? it could be ring valves hopefully not, good luck though.

  10. #10
    Join Date
    Mar 2005
    Location
    Hockinson, Washington
    Posts
    2,499

    Default

    Quote Originally Posted by 632 Regal
    what is the horse power between the 2 engine years?
    It didnt change.
    Lowered with blue h&r(?) springs, Bilsteins, tint, 19# design 3 injectors, Dual Magnaflow
    southwest WA

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