Main IndexAuto Repair Home Search Posts SEARCH
POSTS
Who's Online WHO'S
ONLINE
Log in LOG
IN









pig or knock


Search for (search options)
 



Coloradomom
User

Jun 1, 2010, 9:43 AM

Post #1 of 22 (1787 views)
pig or knock Sign In

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


nickwarner
Veteran / Moderator
nickwarner profile image

Jun 1, 2010, 2:10 PM

Post #2 of 22 (1776 views)
Re: pig or knock Sign In

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.


Coloradomom
User

Jun 1, 2010, 4:58 PM

Post #3 of 22 (1767 views)
Re: pig or knock Sign In

I will try that.


nickwarner
Veteran / Moderator
nickwarner profile image

Jun 1, 2010, 5:23 PM

Post #4 of 22 (1762 views)
Re: pig or knock Sign In

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.


Coloradomom
User

Jun 1, 2010, 5:38 PM

Post #5 of 22 (1761 views)
Re: pig or knock Sign In

I am already looking at a few used motors,
In neutal i do not hear this sound


Coloradomom
User

Jun 2, 2010, 3:18 PM

Post #6 of 22 (1742 views)
Re: pig or knock Sign In

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


nickwarner
Veteran / Moderator
nickwarner profile image

Jun 2, 2010, 5:36 PM

Post #7 of 22 (1739 views)
Re: pig or knock Sign In

Thanks for posting the fix


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jun 2, 2010, 6:04 PM

Post #8 of 22 (1733 views)
Re: pig or knock Sign In

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.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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)


Coloradomom
User

Jun 2, 2010, 6:17 PM

Post #9 of 22 (1724 views)
Re: pig or knock Sign In

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.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jun 2, 2010, 6:20 PM

Post #10 of 22 (1720 views)
Re: pig or knock Sign In

That's true. we improvise like that all the time. A long screwdriver can tell you a lot too.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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.



Coloradomom
User

Jun 2, 2010, 6:21 PM

Post #11 of 22 (1717 views)
Re: pig or knock Sign In

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


Coloradomom
User

Jun 2, 2010, 6:26 PM

Post #12 of 22 (1716 views)
Re: pig or knock Sign In

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


nickwarner
Veteran / Moderator
nickwarner profile image

Jun 3, 2010, 1:01 PM

Post #13 of 22 (1704 views)
Re: pig or knock Sign In

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


Coloradomom
User

Jun 8, 2010, 7:23 PM

Post #14 of 22 (1673 views)
Re: pig or knock Sign In

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.


Coloradomom
User

Jun 8, 2010, 7:26 PM

Post #15 of 22 (1672 views)
Re: pig or knock Sign In

well i am back to square one .
Have a bad push rod . so i will try and replace it .


Coloradomom
User

Jun 10, 2010, 9:15 AM

Post #16 of 22 (1634 views)
Re: pig or knock Sign In

Valve covers removed .
Rockers move sightly.and still have a knock.


Sidom
Veteran / Moderator
Sidom profile image

Jun 10, 2010, 8:01 PM

Post #17 of 22 (1620 views)
Re: pig or knock Sign In

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


Coloradomom
User

Jun 10, 2010, 8:18 PM

Post #18 of 22 (1611 views)
Re: pig or knock Sign In

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.?


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jun 11, 2010, 2:37 AM

Post #19 of 22 (1604 views)
Re: pig or knock Sign In

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.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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.



Coloradomom
User

Jun 11, 2010, 6:45 AM

Post #20 of 22 (1593 views)
Re: pig or knock Sign In

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.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jun 11, 2010, 7:28 AM

Post #21 of 22 (1588 views)
Re: pig or knock Sign In

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.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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.



Coloradomom
User

Jun 11, 2010, 7:33 AM

Post #22 of 22 (1582 views)
Re: pig or knock Sign In

Ok
Thank you for your help.






 
 
 






Search for (options) Privacy Sitemap