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Coloradomom
User
Jun 1, 2010, 9:43 AM
Post #1 of 22
(1767 views)
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1993 GMC suburban ,5.7 liter motor .
At 30/35 per hour a ping or knock .
In drive with one foot on brake and on gas ,same sound .
At idle no noise is heard.
Plugs check /plug wires check Good
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nickwarner
Veteran
/ Moderator
Jun 1, 2010, 2:10 PM
Post #2 of 22
(1756 views)
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Try taking off your serpentine belt and see if the noise goes away. If it does, the trouble is a belt driven accessory. If not, I would drop the oil pan and check the rod and main bearings for damage. Be advised that to do so will require someone with knowledge and experience to put it back together properly and to properly evaluate the bearings themselves.
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Coloradomom
User
Jun 1, 2010, 4:58 PM
Post #3 of 22
(1747 views)
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I will try that.
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nickwarner
Veteran
/ Moderator
Jun 1, 2010, 5:23 PM
Post #4 of 22
(1742 views)
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Bear in mind if you do have a bad bottom end the motor will need to be pulled out and overhauled. If thats not to your liking with the age of the vehicle a used motor might be a decent route. Just make sure there is some guarantee that the one you get isn't a million mile wonder on its last legs. Most salvage yards have gotten good about listing the exact condition upfront of what they have. Good luck to you.
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Coloradomom
User
Jun 1, 2010, 5:38 PM
Post #5 of 22
(1741 views)
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I am already looking at a few used motors,
In neutal i do not hear this sound
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Coloradomom
User
Jun 2, 2010, 3:18 PM
Post #6 of 22
(1722 views)
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I have learned something today.
Before you look for a motor .Look at every thing in your motor and sounds.
I thought i had a bad motor ,,but it come back to a crack in my fly wheel ,that was making my knock.
Thanks every one
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nickwarner
Veteran
/ Moderator
Jun 2, 2010, 5:36 PM
Post #7 of 22
(1719 views)
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Thanks for posting the fix
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Hammer Time
Ultimate Carjunky
/ Moderator
Jun 2, 2010, 6:04 PM
Post #8 of 22
(1713 views)
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Yep, that's the down side to these forums. We don't get to actually hear the noise and in your case it probably would have made it pretty easy to identify what the really problem was.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
(This post was edited by Hammer Time on Jun 2, 2010, 6:04 PM)
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Coloradomom
User
Jun 2, 2010, 6:17 PM
Post #9 of 22
(1704 views)
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Yes it is,
I was prepared to get an other 5.7 ,but i was in the right place and right time.
You would be surprised on what a garden hose will do or wooding stick.They carry a tick or sound real nice.
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Hammer Time
Ultimate Carjunky
/ Moderator
Jun 2, 2010, 6:20 PM
Post #10 of 22
(1700 views)
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That's true. we improvise like that all the time. A long screwdriver can tell you a lot too.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Coloradomom
User
Jun 2, 2010, 6:21 PM
Post #11 of 22
(1697 views)
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I just got lucky,and was in the right place at the right time.
A 32" garden hose or shovel stick work perfect and carry a sound or tick.
Thanks again
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Coloradomom
User
Jun 2, 2010, 6:26 PM
Post #12 of 22
(1696 views)
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In do time i will get an other motor.
Some people think your nuts when you get a garden hose to listen for sound.
It works great on the top of the motor or bottom.
Thanks a lot
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nickwarner
Veteran
/ Moderator
Jun 3, 2010, 1:01 PM
Post #13 of 22
(1684 views)
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If your motor is still running right, I wouldn't just change it out. Glad it was only a flexplate. Takes a bit of labor but cheaper than an engine for sure. Thanks for posting the fix. Don't think you're nuts. I used to think I was but the voices in my head convinced me I was fine
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Coloradomom
User
Jun 8, 2010, 7:23 PM
Post #14 of 22
(1653 views)
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Well i am back to square one .
Pulled plugs And And 6/8 plug are dis colored and knocking again,
So my next step is to pull the cover and check 6/8 .and if the push rod is bad i will replace them .and see what happens.
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Coloradomom
User
Jun 8, 2010, 7:26 PM
Post #15 of 22
(1652 views)
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well i am back to square one .
Have a bad push rod . so i will try and replace it .
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Coloradomom
User
Jun 10, 2010, 9:15 AM
Post #16 of 22
(1614 views)
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Valve covers removed .
Rockers move sightly.and still have a knock.
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Sidom
Veteran
/ Moderator
Jun 10, 2010, 8:01 PM
Post #17 of 22
(1600 views)
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As it was mentioned before it real tough diag'ing a noise online. You can't hear the speed, pitch, area, etc......
Slower knocks are usually bottom end, so of course the faster ones would be top end. You can try disabling the suspected cyl and if the makes a big differenc in how loud the knock is you are probably looking at a lower end problem.........
Good luck
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Coloradomom
User
Jun 10, 2010, 8:18 PM
Post #18 of 22
(1591 views)
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It sounds like the upper right of the motor .
I have the valve covers off.Some of the push rods are loose and some not.
A few of the rockers are loose and some are not.
I am at top dead center .
I am considering on replacing the push rods,but of course i do not know how tight the need to be.?
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Hammer Time
Ultimate Carjunky
/ Moderator
Jun 11, 2010, 2:37 AM
Post #19 of 22
(1584 views)
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I believe your barking up the wrong tree with the push rod idea. Of course the tension would vary as some valves are open and some are not.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Coloradomom
User
Jun 11, 2010, 6:45 AM
Post #20 of 22
(1573 views)
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OK
Then were do i go from here?
I could put the valve covers back on,And put a Qt of ATF in the motor and let it run for a hour .And change out the oil and see what happens .
I CAN SAY ALL ROCKERS/PUSH RODS ARE RECEIVING OIL.
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Hammer Time
Ultimate Carjunky
/ Moderator
Jun 11, 2010, 7:28 AM
Post #21 of 22
(1568 views)
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I have no idea what your noise is and no one else will be able to identify a noise over the Internet. It's just not possible to identify something you can't hear.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Coloradomom
User
Jun 11, 2010, 7:33 AM
Post #22 of 22
(1562 views)
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Ok
Thank you for your help.
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