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SUBJECT: # 7574: Oil/Engine additive for GM piston slap

Submitted by shallowsporter (143.166.99.177) from TEXAS on 5/10/2002 10:45:00 AM

I seem to be in that GM piston slap group? 1999 Z71 with the 5.3 that "slaps" at the first start of the morning only. The slap will last about 5-10 seconds. Sounds more like a " ping " to me? I have read where Slick 50/Z-Max will take care of that ping/slap? What is your thought about that or am I dreaming. Truck is out of warranty 38k. Sorry for the long post, appreciate any info.


  1. 5/10/2002 2:05:00 PM Submitted by Chad (216.124.136.4) from ILLINOIS says Mine
    I have a 2000 Z71 that has never slapped. I use Mobil 1 and a mobil 1 filter. No knocks or anything. Its expensive but lasts twice as long. Try it....


  2. 5/11/2002 6:06:00 PM Submitted by Cutout (209.248.7.41) from ILLINOIS says Piston Slap
    Shallowsporter: I have heard this subject brought up on this board several times along with other items about the late model GM trucks. And GM knows about them, but what they will do about it I am not sure. I have a 2000 GMC with the 5.3 and the only thing that I have had problems with is the throttle sticking.I have 32000 miles on it and have been running Amsoil 0w-30 synthetic in it since 4000 miles.

    Will synthetic motor oil stop the slap at start up? It is worth a try. One thing that you don't want to do is put any additives in it such as Slick 50. This is nothing but 50 wt. oil with Teflon in it and does nothing but clog up your oil passages and cause more engine Damage.

    A lot of people like to run Mobil 1 which is a good oil. But why would pay 4.50 a qt. and run it 5 or 6 thousand miles.When you can buy Amsoil for 6.00 a qt.and run it 25000 miles or a year.Good luck with your slap and let us know if syn. helps.Brad


  3. 5/11/2002 6:52:00 PM Submitted by FishOn (216.54.253.129) from TEXAS says Don't Worry
    I have a 98 Ford with the 5.4 liter engine that suffers from the same piston slap problem. It began when I had a little over 10k miles and I now have 70k miles with no reliability problems and it doesn't use any more oil than when it was new. It sometimes can be a little annoying, but my suggestion is to practice normal maintance and your engine should be ok and I use mobil one oil.

    Also ford has known about their piston slap problem and nothing was down for me and I would expect GM to take the same position. Believe it or not, a lot of new engines of different makes suffer from this particular problem.


  4. 5/12/2002 1:32:00 AM Submitted by miker (68.56.169.44) from FLORIDA says hey cutout
    i had the same throttle sticking problem.they were replacing the throttle body on warranty per a tech service bulletin, then discovered the new ones had the same problem. dealer said best fix was to clean throttle bore with solvent and then use wd40,it worked like a charm.only had to do it once.


  5. 5/13/2002 4:23:00 AM Submitted by Firetiger (24.150.108.179) from Canada says Piston slap
    In response to FishOn's statement I don't know why you say that Ford won't do anything about it. I had the same problem on my 99 Expedition at 38K miles and Ford replaced the engine. The new engine now has about 20K miles and the slap hasn't come back.


  6. 5/13/2002 7:56:00 AM Submitted by Cutout (209.248.7.102) from ILLINOIS says Throttle Pedal Sticking
    Miker: I cleaned the plate a couple of weeks ago and it has helped a lot. I just wonder what will happen down the road at 80 or 100 k and it hangs and hurts me or someone else. You would think that GM would know how to build a throttle body that would not stick by now.I am going to take it in soon and see if they can help it or screw it up worse! For 32k I am going to be hard to get along with if this thing is not fixed right. Brad


  7. 5/13/2002 10:19:00 AM Submitted by Jeff_S (162.89.0.62) from TEXAS says Oil additive and sticking throttle....
    I cured my piston slap with Lucas oil additive. It has no teflon in it and it works really well. As far as a sticking throttle, my wifes 1998 Honda Accord has had this problem as well as my Z71 and my Ford f150 work truck. Carbon just gets built up.


  8. 5/13/2002 10:19:00 AM Submitted by Jeff_S (162.89.0.62) from TEXAS says # 7574: Oil/Engine additive for GM piston slap
    I cured my piston slap with Lucas oil additive. It has no teflon in it and it works really well. As far as a sticking throttle, my wifes 1998 Honda Accord has had this problem as well as my Z71 and my Ford f150 work truck. Carbon just gets built up.


  9. 5/14/2002 11:28:00 AM Submitted by Fastcast (63.155.202.207) from OHIO says It's a Mystery
    On your next oil change try 4 quarts of your regular oil and 1 quart of "Marvel Mystery Oil" and I bet the slap disappears.


  10. 5/28/2002 7:12:00 PM Submitted by Rodney (65.164.83.137) from . says 1999 GMC Sierra piston slap and throttle pedal sticking
    I have a 1999 GMC Sierra 4x4 Extended Cab that on initial start, you can here knocking for 5-10 seconds. It eventually goes away, but happens everytime nomatter what the temp is. I heard Marvels Mystery Oil works, but I have had it in for a week and has not made much difference. Also I am having trouble with the throttle pedal. When you push on it, it will not go down easy. You have to push hard on it, then it launches pretty good. I have tried to use a lubricant, but it did not work. The last thing is I have the burgandy color paint. This thing shows a tremendous amount of swirl marks. I have used a couple of good waxes, but had no luck at all. I have owned GM's all my life, but this one by far has the most problems!


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