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Username Post: 8.1 has a squeek        (Topic#367524)
ranman 
"2nd Year" Silver Supporting Member
Posts: 10875
ranman
Loc: The cold wet and windy O...
Reg: 03-10-01
01-23-22 01:14 PM - Post#2835101    

I have a friend that has a 2002 Chevy 2500 pick up with a 8.1 liter engine.

It's making a sort of chirping sound or squeaking sound similar to a what a pulley or belt might do.
The sound though appears as it's coming from the center of the intake manifold. And I'm wondering if there's anything inside or possibly an injector that can make any kind of weird noises.
He said the PCV valve is down inside there somewhere on these engines.
The squeaky sound is not loud and it doesn't matter which side of the manifold you listen on.
Not serious enough he's about to pull it apart it's just a sound that didn't used to be there.
Any thoughts?


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If plants ruled the world, would they regulate oxygen?


 


grumpyvette 
Senior Chevytalk Moderator -- Performance Subject Matter Expert --
Posts: 17733
grumpyvette
Age: 74
Loc: farmersville texas USA
Reg: 03-16-01
01-23-22 01:36 PM - Post#2835103    
    In response to ranman

Id temporarily remove the fan belt as a quick test to see if its related to a belt driven accessory/pulley/ water pump. etc.Id look for loose vacume lines

IF YOU CAN,T SMOKE THE TIRES AT WILL,FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK!!"!
IF YOU CAN , YOU NEED BETTER TIRES AND YOUR SUSPENSION NEEDS MORE WORK!!


Edited by grumpyvette on 01-23-22 01:37 PM. Reason for edit: No reason given.

 
ranman 
"2nd Year" Silver Supporting Member
Posts: 10875
ranman
Loc: The cold wet and windy O...
Reg: 03-10-01
01-23-22 03:18 PM - Post#2835111    
    In response to grumpyvette

He said they used a stethoscope and the sound was coming from the sides of the intake manifold.
I listened to the sound and that's what it sounded like to me too.
I'm not positive because I didn't check it out I just listened to it.



~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~
If plants ruled the world, would they regulate oxygen?


 
wagonman100 
Site Ambassador
Posts: 15586

Loc: Baltimore, MD
Reg: 11-27-04
01-23-22 09:23 PM - Post#2835139    
    In response to ranman

I would still run it without the belt(s).

Jay
Friends don’t let friends drive Fords.

1999 Silverado Z71 4X4 extra-cab short bed
1983 Malibu Fauxmad - tubbed
1978 El Camino Kustomized
1972 Monte Carlo
1957 210 handyman wagon
1957 Nomad sport wagon
1957 Cameo Carrier


 
ranman 
"2nd Year" Silver Supporting Member
Posts: 10875
ranman
Loc: The cold wet and windy O...
Reg: 03-10-01
01-23-22 09:49 PM - Post#2835140    
    In response to wagonman100

I don't disagree one bit.
Last Friday I stopped to pick up some materials for a flooring installation that I'm working on and this is the warehouse guy that I talked to.
Don't take the term warehouse guy lightly. He's not your average Joe Schmo.
So basically I was at the warehouse and he brought up this subject and we discussed it briefly then he started the engine so I could listen to it. I had to get on with work and get down to my job so I know very little about this.
My knowledge is he told me that his friend had a stethoscope and the sound was coming from the center portion of the intake manifold.
That is literally all that I know and I have not checked out anything on it.
One thing I've done in the past is simply get the serpentine belt wet with something. Usually a squirt of water on the belt is enough to feed you some information.
I told him I would ask here because you guys are smarter than the average Joe times 10....
......ok x1000. ????
I just figured that if this engine had anything specific to it that might cause the weird noise, you guys might already be aware of it.
The sign is hard to describe. I don't know if it could be pushrod guides or if there are lifter guides that could possibly make a squeaky weird sound.
There is a hose right next to where he parks at the warehouse.
I have to stop down at the warehouse tomorrow and I'll have him mist the belts and the pulleys as an initial step.
He's had this truck for a number of years now so he notices a difference in the sound.
If I heard the same sound and just bought the truck yesterday I assume it was a pulley, alternator, water pump, if you just like you guys are mentioning.
It's not allowed sound and it's hard to describe. It just has something that could resemble the tensioner pulley or alternator. It also is sort of a squeaky sound like a vacuum pulse or something like that.
I don't have a clue.
Tell me that injectors cannot make a clicking, squeaking, sound.
I suggested to him too, one at a time, unplugged one injector and see if the sound disappears.
Can injectors make weird noises?
Anyway, I'll talk to him in the morning.
Thanks guys I always appreciate the info you guys provide. Chevytalk is my very first internet experience and I've never looked back. I think CT had a few thousand members back then. It's been a while I'm thinking 1970s? ????


~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~
If plants ruled the world, would they regulate oxygen?


 
Shepherd 
Valued Contributor
Posts: 2552

Loc: Lake George, NY
Reg: 11-11-15
01-24-22 08:57 AM - Post#2835153    
    In response to ranman

A stretch here but if it has a plastic manifold there may be a hairline crack somewhere. Usually that would set a cel as the engine would run lean.



 
Tony1963 
Frequent Contributor
Posts: 1281

Loc: Orlando Florida
Reg: 07-09-18
01-24-22 06:36 PM - Post#2835181    
    In response to Shepherd

Actually, it wouldn't run lean, it would show large positive fuel trim to keep it from running lean.

Fuel trim tells a lot about an engine.



 
Shepherd 
Valued Contributor
Posts: 2552

Loc: Lake George, NY
Reg: 11-11-15
01-24-22 06:54 PM - Post#2835182    
    In response to Tony1963

Yes, but once it reached the maximum fuel trim, now the code, fun isn't this. Lol



Edited by Shepherd on 01-24-22 06:54 PM. Reason for edit: No reason given.

 
ranman 
"2nd Year" Silver Supporting Member
Posts: 10875
ranman
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01-24-22 11:43 PM - Post#2835192    
    In response to Shepherd

Gee, why do I love carburetors??? ????????????
I talked to the fella again this morning and he said they did wet the belts and listen to the pulleys and water pump.
He told me they checked with the stethoscope on the sides of the manifold and that's where this strange noise was most noticeable.
He also ran water around the entire manifold to check for vacuum leaks.
It's a quiet, but sound that makes you wonder why it's there.
I don't know if pushrod guides or something else could make noises or as he seems to be thinking the PCV valve. You said that Chevy put the PCV of down under the intake manifold. Is that true on an 8.1 Liter?

~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~
If plants ruled the world, would they regulate oxygen?


Edited by ranman on 01-24-22 11:48 PM. Reason for edit: No reason given.

 
ranman 
"2nd Year" Silver Supporting Member
Posts: 10875
ranman
Loc: The cold wet and windy O...
Reg: 03-10-01
01-25-22 12:03 AM - Post#2835193    
    In response to Shepherd

I didn't pay super close attention but I'm very sure it's aluminum. Had it been funky looking plastic I think that would have caught my eye.
Thanks for bringing that up, I didn't know they made plastic manifolds.
....yes, I'm way behind the times. ????

~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~
If plants ruled the world, would they regulate oxygen?


 
someotherguy 
Senior Moderator
Posts: 29573
someotherguy
Loc: Texas
Reg: 08-01-03
01-25-22 09:49 AM - Post#2835215    
    In response to ranman

The 8.1 has a PCV in the bottom of the intake. It's not the check ball style, it's the fixed orifice style some of the other newer engines use. If you had the intake off and flipped it over to see, it just looks like a large vacuum port sticking out.



It's possible the orifice can get gunked up with carbon...

I've got vague-ish memory of a discussion on the now-defunct 3500hd.com forum where a member owned several 8.1-equipped trucks and had rebuilt a few of those engines. He noticed on some early models that seemed to use oil more than the newer ones. After tearing a few down he noticed the newer engines had the PCV at an angle, and the older ones aimed straight down towards the lifter valley. He drew the conclusion that the older design was more prone to sucking up oil.

Richard

06 Silverado ISS / 06 Silverado SS / 06 300C SRT8


 
ranman 
"2nd Year" Silver Supporting Member
Posts: 10875
ranman
Loc: The cold wet and windy O...
Reg: 03-10-01
01-25-22 11:15 AM - Post#2835220    
    In response to someotherguy

Thank you that's super information. ????
So basically there's nothing in there that could make a ticking sound because they wouldn't be a check ball?

~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~
If plants ruled the world, would they regulate oxygen?


 
someotherguy 
Senior Moderator
Posts: 29573
someotherguy
Loc: Texas
Reg: 08-01-03
01-25-22 04:41 PM - Post#2835229    
    In response to ranman

  • ranman Said:
Thank you that's super information. ????
So basically there's nothing in there that could make a ticking sound because they wouldn't be a check ball?


Correct, no check ball.

However, I can imagine (again, just a guess though) that if the orifice is carboned/gunked up, that *could* be a source of the squeaking noise.

Other possibilities he will like less. Such as: bad lifter

Richard

06 Silverado ISS / 06 Silverado SS / 06 300C SRT8


 
Tony1963 
Frequent Contributor
Posts: 1281

Loc: Orlando Florida
Reg: 07-09-18
01-25-22 04:53 PM - Post#2835231    
    In response to someotherguy

I know that on Volvo and Volkswagen a malfunctioning crankcase vent system will make the noise that you are describing.



 
ranman 
"2nd Year" Silver Supporting Member
Posts: 10875
ranman
Loc: The cold wet and windy O...
Reg: 03-10-01
01-25-22 08:23 PM - Post#2835236    
    In response to Tony1963

Is there any way to clean out that orifice or would one actually have to remove the manifold?


~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~
If plants ruled the world, would they regulate oxygen?


Edited by ranman on 01-26-22 08:56 PM. Reason for edit: No reason given.

 
Wedgee 
Newbie
Posts: 2

Reg: 10-24-14
02-08-22 09:12 PM - Post#2835918    
    In response to ranman

I have experienced intake manifold not matching up correctly, so took off and had it machined for better alignment, it slowed down oil consumption once i had this done, and another issue i have experienced is (not on same engine) one with about 150 miles on it had a noticeable loud squeaking & it was on right front of engine, still under warranty! Turned out a valve lifer (HYD) did not have a hole drilled in it for oil to pass up to rockers. Just my Experiences
.



 
ranman 
"2nd Year" Silver Supporting Member
Posts: 10875
ranman
Loc: The cold wet and windy O...
Reg: 03-10-01
02-09-22 02:13 PM - Post#2835952    
    In response to Wedgee

It's been awhile since I stopped at the warehouse to talk to the warehouse guy that has the problem with his truck.
He took it to the local Chevy dealership and mechanic listened to it. He said it sounded like a cam bearing going out.
...then the mechanic estimated the cost of doing the repairs to it.
....he then proceeded to tell the guy that if he wanted to sell the truck, he'd make him an offer on it
My buddy bought his own stethoscope and listened to the engine for himself.
He said he could hear it at the base of the manifold and he could hear it ticking at the injectors themselves which, was probably just the injectors.
He just noticed that he was having problems with his starter it was occasionally not starting and sometimes you would have to make several attempts.
He decided to replace the starter and when doing so notice that the Bendix arm was bent or tweaked a little bit. After replacing the starter the squeaking/ticking sound went away.
It seems that something in the bendix, maybe the gear would slide close enough to the ring gear and just barely touch it, enough to make this strange noise that is hard to describe.
He's happy to pay 160 bucks for a starter instead of believing what the mechanic at the dealership said.
One of my Buddy's friends had listened to the sound and ask him how long has it been making the sound. He said a few weeks. His friend told him if it was a cam bearing making that noise your truck wouldn't be running right now. That's when he did a slow simmer after going to the dealership and being told it was probably a cam bearing.
Our dealerships getting more shady because they don't have any cars on the lot? A good mechanic could have listened to that noise and known quite easily it wasn't a cam bearing. He didn't check the dipstick for metallic particles in the oil either. There weren't any and you'd think that a mechanic concerned about a cam issue might check for metallic particles before blurting out is probably a cam bearing.
Oh well guys next time you hear a ticking sound it might be your starter.
I appreciate your advice, it means a lot.
If I would have had the time to investigate I would have spent some more time listening to his noise than I did.

~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~
If plants ruled the world, would they regulate oxygen?


Edited by ranman on 02-09-22 02:19 PM. Reason for edit: No reason given.

 
someotherguy 
Senior Moderator
Posts: 29573
someotherguy
Loc: Texas
Reg: 08-01-03
02-10-22 12:15 PM - Post#2836004    
    In response to ranman

That was a lucky break to discover the source of the noise in a faulty starter. Sure makes sense that a bad bendix might be kissing the flexplate and making a racket.

Semi-related story, friend of mine bought an excellent condition school bus decades ago because the seller thought the engine was locked up. Friend figured no big deal, easy enough to swap an engine later when he was ready. Bus sat for years in the back of his shop until one day he decided to rob the starter from it for another project. When he pulled the starter the bendix shot backwards out of the extended position. The starter was bad. The engine was fine. I myself put a replacement starter on it, soaked the cylinders down with MMO, and turned it over by hand a few times before firing it up and it running just fine. Just one of my many tasks as a teenaged shop gofer/mechanic's assistant.

As far as the dealership mechanic that tried to convince your friend that a cam bearing was toast, you could look at it 50/50; either the guy was just legitimately wrong - or he was being dishonest. The latter seeming more likely since he was so interested in buying the vehicle. Either way, I don't think I would return to that dealer for anything whatsoever. I've got very little tolerance for cheats and liars. You get a lot more respect out of me for being honest, and that respect gets repaid with further business and recommendations to others.

Richard

06 Silverado ISS / 06 Silverado SS / 06 300C SRT8


 
ranman 
"2nd Year" Silver Supporting Member
Posts: 10875
ranman
Loc: The cold wet and windy O...
Reg: 03-10-01
02-10-22 10:13 PM - Post#2836046    
    In response to someotherguy

A few hours later, I was asked to measure up new flooring at the dealers home........ WOW, boggles the mind
Dealer an his wife are super cool people, so I'm not gonna knock the dealership because of a second hand story of events.
If I was a mechanic, my guts would tell me not to even mention an interest in buying the truck. It just wouldn't feel right.

~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~
If plants ruled the world, would they regulate oxygen?


 


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