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Knock Knock.......who's there? crappy running engine! thats who!

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by IDGMC, Mar 13, 2000.

  1. IDGMC

    IDGMC 1/2 ton status

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    Knock Knock.......who\'s there? crappy running engine! thats who!

    Well i think i have a lifter that is knocking....I've adjusted the valves thinking that was the problem but it didn't help so maybe a lifter that is gunked up??? When it's cold i get a knock that increase with RPM....but will go away after awhile. But it will also occure when the engine is warm....sometimes! I don't know the origin of the motor, but it is only suppost to have like 30,000 miles on it, i'm guessing one of those discount autoparts stores rebuilds that reuses old camshafts and stuff if there in spec (engine was in when i bought it) So my question is should i spend a couple of hundred and put a new cam and lifter and timing chain in and see if that fixes the problem or do you guys thing its something else? Thanks for the help
     
  2. OLDSTEEL

    OLDSTEEL 1/2 ton status

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    Re: Knock Knock.......who\'s there? crappy running engine! thats who!

    I would save the money(for now) and start by pulling the rocker arms and push rods and give them a good inspection, I've seen more than one push rod bent while someone was adjusting valves. Also take a look at the rocker studs. I think alittle time is better than alot of money.
     
  3. cocky

    cocky Registered Member

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    Re: Knock Knock.......who\'s there? crappy running engine! thats who!

    I heard if you add a quart of Automatic tranny fluid to your oil sometimes it will clean out a dirty lifter. Never done it but i don't think it will hurt your engine.
     
  4. 79Cheyenne

    79Cheyenne 1/2 ton status

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    Re: Knock Knock.......who\'s there? crappy running engine! thats who!

    This Automatic transmission fluid craze is out of hand. You guys will add this "miracle fluid" to anything. So what do you put in the transmission?

    or is this the secret ingredient in<font color=red> Marvelous Mistery Oil<font color=black>?

    <font color=orange>1979 BLAZER Cheyenne[​IMG]
     
  5. Catfish

    Catfish Newbie

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    Re: Knock Knock.......who\'s there? crappy running engine! thats who!

    yes you are right. if you add a some atf fluid to the oil it will clean out any stuff that may be building up in the motor. how ever you should only run in the motor for a few hours then drain it. the best time would be right befor you change your oil.
     
  6. IDGMC

    IDGMC 1/2 ton status

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    Re: Knock Knock.......who\'s there? crappy running engine! thats who!

    so when you say a few hours do you mean like a constinant 2 hours or just run around town for awhile and then change the oil?
     
  7. Kyle89K5

    Kyle89K5 1/2 ton status

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    Re: Knock Knock.......who\'s there? crappy running engine! thats who!

    Had the same noise on my 89. Stuck lifter. Stuck a bottle of motor honey in and it cleared it up. The ATF fluid thing is another good one. I had a buddy that did it on his old truck, stuck it in there, ran the thing for a couple of hours then drained the fluid. Took care of the problem. Be careful though about overfilling the thing. Get about a quart low then put it in there.

    Kyle
    89K5
     
  8. OLDSTEEL

    OLDSTEEL 1/2 ton status

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    Re: Knock Knock.......who\'s there? crappy running engine! thats who!

    9 out of 10 times these additives are a temparary cover-up for a more serious problem. Take the time to find the root of the problem before you end up spending big $$$.
     
  9. Can Can

    Can Can Pusher Man Staff Member Super Moderator

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    Re: Knock Knock.......who\'s there? crappy running engine! thats who!

    Are you sure it's an internal problem? I once had a real sneaky exhaust leak that sounded like a lifter. Sometimes things are not what they appear. The fact that it happens less when warm might point to exhaust.
     
  10. Kyle89K5

    Kyle89K5 1/2 ton status

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    Re: Knock Knock.......who\'s there? crappy running engine! thats who!

    I would prefer to spend $3 to see if that fixes the problem before dropping in $1500 on a rebuild. I used the additive about 15,000 miles ago... no problems. When the motor gives up, I'll fix it. Till then there is no point in rebuilding a motor or a topend for that matter when I can fix it with something else. If the additive hadn't worked then dang, I'm out $3 and now I'll pull it apart and fix it. I wasn't concerned about tearing anything up, the lifter has been ticking for a little while and if it was gonna break it already would have.

    Kyle
    89K5
     
  11. OLDSTEEL

    OLDSTEEL 1/2 ton status

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    Re: Knock Knock.......who\'s there? crappy running engine! thats who!

    If it breaks on the trail your in for a hell of a trip! Better safe than sorry, looking for the problem does not cost you anything.
     
  12. Kyle89K5

    Kyle89K5 1/2 ton status

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    Re: Knock Knock.......who\'s there? crappy running engine! thats who!

    Stuff breaking on the trail happens. If my motor has got problems, then I shouldn't have been out on the trail anyways. That, IMO, is disrespectful of others. If your truck may not complete the ride because of something you ALREADY knew was wrong. Then catch a ride with someone else and leave your rig at home. I looked for the problem, and after checking that seemed to be the best option for addressing it. If that hadn't of worked then I would have pulled the thing apart and gone that route. Like I said, 15,000 miles and still fixed. Tearing something down ain't always the best route.

    MY $0.02

    Kyle
     
  13. OLDSTEEL

    OLDSTEEL 1/2 ton status

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    Re: Knock Knock.......who\'s there? crappy running engine! thats who!

    I'm not saying you are wrong just trying to present a second school of thought. I do agree that if you know somthing is wrong you should leave it at home and catch a ride. I just wish everyone thought that way.
     

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