5mge No Power

Results 1 to 8 of 8

Thread: 5mge No Power

  1. #1
    Junior Member
    Join Date
    Apr 2017
    Location
    Utah
    Posts
    3

    Unhappy 5mge No Power

    Im new to the forums! I have an 82 Supra. I put a lot of money into to get it running and it was running great but recently, it started knocking once it gets to the higher revs. it has no power what so ever but it idles fine. I suspected that I spun a bearing but i found no metal shavings in my oil filter(cut it open). I then suspected it might of slipped a tooth on the timing but i checked the timing and everything lines up and the belt is still nice and tensioned. I have no idea what it could be. Bad dizzy? any ideas guys?

  2. Remove Advertisements
    CelicaSupra.com
    Advertisements

  3. #2
    Junior Member SuprasEdge's Avatar
    Join Date
    Feb 2016
    Location
    Aurora, Co
    Posts
    23
    Quote Originally Posted by MK2Soup View Post
    Im new to the forums! I have an 82 Supra. I put a lot of money into to get it running and it was running great but recently, it started knocking once it gets to the higher revs. it has no power what so ever but it idles fine. I suspected that I spun a bearing but i found no metal shavings in my oil filter(cut it open). I then suspected it might of slipped a tooth on the timing but i checked the timing and everything lines up and the belt is still nice and tensioned. I have no idea what it could be. Bad dizzy? any ideas guys?
    It sounds like you've developed a rod knock. It sucks bud but it'll give you the chance to tear into her and get some machining done!

    Sent from my SM-N910P using Tapatalk

  4. #3
    Junior Member
    Join Date
    Apr 2017
    Location
    Utah
    Posts
    3
    But it doesn't knock at all rpms? Just at higher rpms

  5. Remove Advertisements
    CelicaSupra.com
    Advertisements

  6. #4
    Junior Member SuprasEdge's Avatar
    Join Date
    Feb 2016
    Location
    Aurora, Co
    Posts
    23
    Quote Originally Posted by MK2Soup View Post
    But it doesn't knock at all rpms? Just at higher rpms
    Ive seen motors do that also. Let me ask you a few questions. The sound, is it like a ticking? Or a low ended knock sound? Does it increase with engine speed? Does it get worse with a load rather than just revving in neutral?

    Sent from my SM-N910P using Tapatalk

  7. #5
    CelicaSupra.com Member ddd228's Avatar
    Join Date
    May 2005
    Location
    N. Seattle.
    Posts
    4,417
    Quote Originally Posted by SuprasEdge View Post
    Ive seen motors do that also. Let me ask you a few questions. The sound, is it like a ticking? Or a low ended knock sound? Does it increase with engine speed? Does it get worse with a load rather than just revving in neutral?

    Sent from my SM-N910P using Tapatalk
    What he said!^^^^^^^^^^^^^^^^^
    is it "pinging"?
    You said"Knock".
    The low power is in my opinion, a different symptom.
    There may be a bad bearing (in a rod or) a main journal bearing.

    I'll guess that it has a few miles on the engine.

    A band aid may be to go with a heavier weight of oil,like I did with my tired,leaky engine.
    I ran 20W-50,towards the end of it's life.
    This a 5-MGE?
    You have a (DUEL) vacuum advance distributor.
    They needs to be tested for both vacuum units, for decent power.
    They are getting quite rare,lately.
    Dave in Seattle. I keep LATE hours.Hidden Content
    '84 type "L" ,Auto ,daily driver. Dk blue.

  8. #6
    Junior Member
    Join Date
    Apr 2017
    Location
    Utah
    Posts
    3
    So when warming up, there is no knock or tick. Seems fine when driving while it's still cold. Still underpowered but not as much until it's warmed up. The more you drive, you start hearing a faint tick. Then it the louder and louder the knock gets. And yes it sounds like a knock when revving it. Oil pump? I don't have an oil pressure gauge. I'll check the compression as well

  9. #7
    CelicaSupra.com Member
    Join Date
    Aug 2011
    Location
    Arlington, WA
    Posts
    1,154
    I agree with Dave on both counts. Your power problem is most likely due to one of the vacuum diaphragms being bad. It's the inner one, strangely called the sub diaphragm, that's likely the culprit. It's used for all operating conditions. The other one is only used to supplement it under extremely cold conditions. Your MPG also drops into the toilet when the sub diaphragm is toast. Sound familiar?
    An easy way to test both diaphragms is to either attach a vacuum pump or even just a length of clean vacuum hose and suck on it. They should both hold vacuum. And with the distributor cap removed, you should see the plate that the ignition pickup mounts to move some with vacuum applied to either. It's a very common problem that unfortunately, has only two possible solutions. Find a good used one that a forum member would be willing to part with (not likely, but not impossible), or buying a remanufactured distributor assembly which isn't that expensive. IIRC, they're in the neighborhood of $150. I can assure you that no matter what you find on line, any replacement vacuum advance assemblies listed are not the correct ones. This application is one year, one model only. And there isn't any universal ones that would fit this distributor either, at least as far as I know.
    You might also have either a plugged fuel pickup sock in the gas tank, which is still available from Toyota and worth replacing anyway unless you know it recently has been. And / or you could and likely do have a plugged inline filter inside the inlet hose to your fuel pump. It's a very small cone shaped filter that's right at the fuel pump inlet and unfortunately NLA, so be very careful cleaning it. Don't even think about running without it unless you like being stranded unexpectedly and regularly and buying fuel pumps too. And they aren't cheap!
    And with the high mileage virtually all of these engines have accumulated by now, a bit thicker oil may take care of your noise. Wear is certainly a reasonable cause as is additional clearance and oil thinning that always happens to some extent as everything gets up to operating temps. It's certainly worth a try before assuming the worst.

  10. #8
    Junior Member
    Join Date
    Sep 2016
    Location
    Chester, Va
    Posts
    27
    ive got a great 5mge in richmond Va. will sell cheap if you pick up.

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

    Posting Permissions

    • You may not post new threads
    • You may not post replies
    • You may not post attachments
    • You may not edit your posts