Whats this sound like to you? 3 year old fuel and oil... - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1987-1991 Parley with regards to your 1987 to 1991 Bonneville, Olds 88 or Buick Le Sabre Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

Reply
 
 
 
Thread Tools Search this Thread
Old 01-11-2008, 10:01 PM   #1
Senior Member
Posts like a Turbo
Thread Starter
 
Join Date: Jul 2007
Location: Joplin, Missouri
Posts: 354
Thanks: 0
Thanked 0 Times in 0 Posts
Alibi is on a distinguished road
Default Whats this sound like to you? 3 year old fuel and oil...

1988 LeSabre T Type vin C motor, 163k miles

http://www.youtube.com/watch?v=HCqs9SAjuVw

It has old oil and old fuel with some fresh fuel mixed in. No stabilizer. Asked previous owner before the current owner if it had a knock when he got it and he said no. It was a daily driver until the PO bought it as a parts car and then decided it was in too good of shape to pull apart.

The knocking makes me think its the old oil not getting up to the top end like it should and its causing one of the valves to stick or something. Guy who has it now says he put in about a half quart of fresh oil and the knocking got less.

Second opinions?
Alibi is offline   Reply With Quote
Old 01-11-2008, 10:05 PM   #2
Junior Member
 
Join Date: Apr 2006
Location: Purgatory
Posts: 0
Thanks: 0
Thanked 0 Times in 0 Posts
Bonneville92V688 is on a distinguished road
Default

Sounds like a rod knock to me. COULD be a bad harmonic balancer though. Does it have good oil pressure?
Bonneville92V688 is offline   Reply With Quote
Old 01-12-2008, 12:14 AM   #3
Senior Member
True Car Nut
 
Join Date: Apr 2004
Location: Three Oaks, Michigan
Posts: 4,879
Thanks: 0
Thanked 0 Times in 0 Posts
opensourceguy is on a distinguished road
Default

What about changing the oil and filter altogether? go buy some SAE30w oil w/o detergent for 1.15 just about any good cheap oil source... Dollar General for me lol. That and a generic filter for $3 and you have a 4.5qt motor, so that'* a $9 oil change. Can't get any better than that.

Try also pulling the valve covers to see if the valvetrain is alright. The front one comes off in a jiffy, so if that one looks good, the rear probably will too. If it'* all sludged up or the metal looks all warped and degraded [bad oil] then uhh your f'd. Or check if the rockers are loose, if they aren't horribly loose and the bolts aren't finger tight it isn't going to be making any noise or at least any loud noise.

If you do have an oil pressure gauge [probably don't tho eh?], if that takes a long time to rise up, that'* a sign of clogged crap oil, and if it'* crap psi to begin with, then she'* done anyways. A quick check with just a dummy light, is timing how long it takes for the light to go off after a dry filter prime. Mine [a 40psi solid motor], takes about a full second with a primed filter for the pressure to start building.

Bad harmonic balancer is an easy check by grabbing the alt fins and trying to rotate the pulley to turn the belt. If it'* all loose and rotates the belt a bit and has an audible hit to it when it grabs, that'* a bad one. If it'* tight so that all your strength can't move it just a bit and it'* more just alt pulley grabbing the belt, she good.

EDIT: now that I've seen the video, man that sure does sound like the HB being ****. Test that belt thing out, and see what happens... you'll know. If not, change the oil with some straight 30w, and maybe a qt of lucas if you want to drive the car. I saw all the gauges rise up real quick, and i saw two, so one had to be volts and oil so i'm gonna assume that'* good, but may be thinned oil, mixed with caustic bad gas.
opensourceguy is offline   Reply With Quote
Old 01-12-2008, 12:28 AM   #4
Senior Member
Posts like a Northstar
 
bastard's Avatar
 
Join Date: Nov 2005
Location: Arkansas
Posts: 694
Thanks: 0
Thanked 0 Times in 0 Posts
bastard is on a distinguished road
Default

Sounds like a little bit of everything going wrong.
Cold day
old oil
tired engine
and possibly a bad HB. Try rolling the belt on the alternator pulley and see if you have play. Since the sounds kind of lets up after you goose the throttle, I'm betting that the HB is bad. But there could still be other stuff wrong too.
bastard is offline   Reply With Quote
Old 01-12-2008, 03:20 AM   #5
Senior Member
Posts like a Turbo
Thread Starter
 
Join Date: Jul 2007
Location: Joplin, Missouri
Posts: 354
Thanks: 0
Thanked 0 Times in 0 Posts
Alibi is on a distinguished road
Default

The car in the vid is actually 300 miles away but I've been asking the present owner to look over some things for me. I'll have him change the oil and check out the balancer. If anything, I'm going to go over the car once I get it and fix it. Worse case scenario I have to put a new motor in but for as cheap as I'm getting the car I won't cry over it.
Alibi is offline   Reply With Quote
Old 01-12-2008, 06:31 PM   #6
BANNED
 
Join Date: Aug 2002
Posts: 0
Thanks: 0
Thanked 0 Times in 0 Posts
banned3800 is on a distinguished road
Default

It sounds a lot like a bad rod bearing or a bearing with a bit too much clearance..... Could be a bad lifter as well.. But i heard more than I liked when he reved it up..

Now if the oil was old and fouled a bit with fuel its really easy at that point to destroy the bearings in it... So anything at this point is possible..

__________________
Best Car Insurance | Auto Protection Today | FREE Trade-In Quote
banned3800 is offline   Reply With Quote
Old 01-12-2008, 06:50 PM   #7
Senior Member
True Car Nut
 
Join Date: Mar 2004
Location: Ames, Iowa
Posts: 3,066
Thanks: 0
Thanked 1 Time in 1 Post
bill buttermore is on a distinguished road
Default

Does it knock after it is fully warmed up? That could be bad bearings as others have suggested. Or does the noise go away? If the noise goes away, it is not the HB. Could be piston slap from worn pins.

Consider that it is possible to make a bad deal even if someone gives you a car for free.
bill buttermore is offline   Reply With Quote
Old 01-12-2008, 07:18 PM   #8
Senior Member
Posts like a Turbo
Thread Starter
 
Join Date: Jul 2007
Location: Joplin, Missouri
Posts: 354
Thanks: 0
Thanked 0 Times in 0 Posts
Alibi is on a distinguished road
Default

I think the noise gets less as it goes, but its hard to tell just from the vid.

If its got slop on a piston or whatever, would it still make a 300 mile trip? Once I get it back to Joplin I could put another motor into it pretty easily. Zero rust, perfect front spoiler, and composite fenders really makes me want to get this car, even if the motor craps out on me in a few thousand miles.
Alibi is offline   Reply With Quote
Old 01-12-2008, 07:21 PM   #9
Senior Member
Certified GM nut
 
Join Date: Oct 2006
Location: burb of detroit. 2 miles north of 8 mile Rd.
Posts: 2,028
Thanks: 0
Thanked 0 Times in 0 Posts
samueljackson is on a distinguished road
Default

did you change the oil? or did you check the level, bc i used to have an old 2.8 that burned oil baddd (1 qt a week) and when low, it would sound similar to ur vid. not as drastic, but similar.
samueljackson is offline   Reply With Quote
Old 01-12-2008, 07:27 PM   #10
Senior Member
Posts like a Turbo
Thread Starter
 
Join Date: Jul 2007
Location: Joplin, Missouri
Posts: 354
Thanks: 0
Thanked 0 Times in 0 Posts
Alibi is on a distinguished road
Default

Car is 300 miles away. The guy that has it said he put in about a 1/3 of a bottle and the noise seemed like it got better, so that sounds promising. Hes going to change the oil before I get the car but he'* going back to school tomorrow so I won't know till later...
Alibi is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Bet your 5 Year Old can drive this better than You GXP Venom Lounge 7 04-13-2010 01:13 AM
does this sound like a scam to you? Bonnevillan General GM Chat 8 04-16-2008 10:34 AM
Does this sound like rod knock to you? repinS Lounge 3 08-17-2007 01:07 PM
Are you smarter than a 12 year old? MOS95B Lounge 25 03-22-2004 12:06 AM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 06:23 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.