Skip to main content ↑ ↓
Topic: Tapping sound while idling after the oil change... (Read 2352 times) previous topic - next topic

Tapping sound while idling after the oil change...

Reply #15 –
Quote from: Thunder Chicken
When the oil was changed there would have been a brief moment when the car was first started that there would have been no oil pressure, and this may have caused a lifter to collapse.

Guess I'm not optimistic lately and thinking about the wrost. I'll have more free time now, so I better like to fix my car even if it's something serious. Is there another similar possibility that when there have been no oil pressure in the system for a short while one of the bearings that was slightly damaged before has polished the crank and the misterious sound got worse?
I'll take the serpentine belt off today to run the engine without the fan and will try to record this sound. With the fan running it's impossible to record it well.
Talk again soon!

Tapping sound while idling after the oil change...

Reply #16 –
The berrings usally get worse with higher rpm's. I doubt its that.
Quote from: jcassity
I honestly dont think you could exceed the cost of a new car buy installing new *stock* parts everywhere in your coug our tbird. Its just plain impossible. You could revamp the entire drivetrain/engine/suspenstion and still come out ahead.
Hooligans! 
1988 Crown Vic wagon. 120K California car. Wifes grocery getter. (junked)
1987 Ford Thunderbird LX. 5.0. s.o., sn-95 t-5 and an f-150 clutch. Driven daily and going strong.
1986 cougar.
lilsammywasapunkrocker@yahoo.com

Tapping sound while idling after the oil change...

Reply #17 –
Finally I've taken the belt off and recorded a short video. I used "lifters additive" and the sound got worse!
Please let me know what you think. It sounds like trouble to me! I dunno what to do and noone knows for sure of what it actually is!
http://www.americangranada.com/pics/engine_sound.wmv

Tapping sound while idling after the oil change...

Reply #18 –
Do you have any ideas after watching the video?
I'm looking for some good drawings of the pre 1987 V6. Is there anyone in our group who has a 1986/87 Ford Shop Manual and could scan V6 part for me?
Thanks in advance!

Tapping sound while idling after the oil change...

Reply #19 –
Well it's hard to tell from a recording, but it sounds like a tinny kind of tapping noise which usually indicates valve train... And at any rate sounds like more than one to me. I used to have a 3.8 Buick V6 that did that when it was really hot because of low oil pressure...

Since the noise started after a oil change, I'd suspect the oil filter... It could be restricting flow, causing low pressure.

Has the oil pressure been checked???

BTW a good idea when changing oil, is to fill the filter before installing it. That prevents the engine from being oil starved(no oil pressure) while the pump fills the filter.

Tapping sound while idling after the oil change...

Reply #20 –
If you are talking about the knock after you let off the gas, it sounds like a connecting rod to me. Hope I am wrong.

Tapping sound while idling after the oil change...

Reply #21 –
Quote from: softtouch
If you are talking about the knock after you let off the gas, it sounds like a connecting rod to me. Hope I am wrong.

Connecting rod bearing? Is it possible to replace them in 3.8 V6 without taking the engine out?

Tapping sound while idling after the oil change...

Reply #22 –
I haven't heard the sound as I can't download the file (curse this dialup hell), but if it is a rod bearing you're pretty much looking at a lower end rebuild, and this means the engine has gotta come out. It may be possible to do it in the car, but I sure wouldn't wanna try it. If the rod bearing is bad it almost certainly would damage the crankshaft. The crank would have to come out and be turned undersize in at least that one journal (provided it isn't worn below the undersize limit). Chances are you'd have to have the rod's big end redone as well.
2015 Mustang GT Premium - 5.0, 6-speed, Guard Green - too much awesome for one car

1988 5.0 Thunderbird :birdsmily: SOLD SEPT 11 2010: TC front clip/hood ♣ Body & paint completed Oct 2007 ♣ 3.55 TC rear end and front brakes ♣ TC interior ♣ CHE rear control arms (adjustable lowers) ♣ 2001 Bullitt springs ♣ Energy suspension poly busings ♣ Kenne Brown subframe connectors ♣ CWE engine mounts ♣ Thundercat sequential turn signals ♣ Explorer overhead console (temp/compass display) ♣ 2.25" off-road dual exhaust ♣ T-5 transmission swap completed Jan 2009 ♣

Tapping sound while idling after the oil change...

Reply #23 –
Quote from: Thunder Chicken
I haven't heard the sound as I can't download the file (curse this dialup hell)


Would anyone else that has heard the file say it sounds sort of like a diesel engine?
"lol.. because not too many people care for that style of car"
[size=-2]Click on paw print \/[/size]

Tapping sound while idling after the oil change...

Reply #24 –
Actually, curiosity got the better of me and I downloaded it. It only took 45 minutes :D

It's very hard to hear, but if I'm hearing what I think I'm hearing I'm gonna have to agree with softtouch - that sounds like bottom end noise. And it does not sound healthy :(
2015 Mustang GT Premium - 5.0, 6-speed, Guard Green - too much awesome for one car

1988 5.0 Thunderbird :birdsmily: SOLD SEPT 11 2010: TC front clip/hood ♣ Body & paint completed Oct 2007 ♣ 3.55 TC rear end and front brakes ♣ TC interior ♣ CHE rear control arms (adjustable lowers) ♣ 2001 Bullitt springs ♣ Energy suspension poly busings ♣ Kenne Brown subframe connectors ♣ CWE engine mounts ♣ Thundercat sequential turn signals ♣ Explorer overhead console (temp/compass display) ♣ 2.25" off-road dual exhaust ♣ T-5 transmission swap completed Jan 2009 ♣

Tapping sound while idling after the oil change...

Reply #25 –
I'm going to have to guess connecting rod bearing. It sounds like marbels in a tin can to me. Not a good thing:yuck:
88 Thunderbird LX: 306, Edelbrock Performer heads, Comp 266HR cam, Edelbrock Performer RPM intake, bunch of other stuff.

Tapping sound while idling after the oil change...

Reply #26 –
The sound is kinda exaggerated becouse of codecs I used to change file size. Why this sound is gone if I change engine rpm from 600 to 650/700rmp? And why it's almost gone with gear engaged? The sound is also gone with the A/C on, becouse it's idling higher.
Can I check if it's a bearing using a stethoscope? Where would it be the most audible?

Tapping sound while idling after the oil change...

Reply #27 –
I have one more question. Is the 3.8 V6 using metric bolts?

Tapping sound while idling after the oil change...

Reply #28 –
Place your stechoscope on the oil pan - it should be most audible there.
 
The noise may go away at different RPM"s because the oil pressure comes up enough to cushion the knock.
 
Most of the bolts on a 3.8 are metric
2015 Mustang GT Premium - 5.0, 6-speed, Guard Green - too much awesome for one car

1988 5.0 Thunderbird :birdsmily: SOLD SEPT 11 2010: TC front clip/hood ♣ Body & paint completed Oct 2007 ♣ 3.55 TC rear end and front brakes ♣ TC interior ♣ CHE rear control arms (adjustable lowers) ♣ 2001 Bullitt springs ♣ Energy suspension poly busings ♣ Kenne Brown subframe connectors ♣ CWE engine mounts ♣ Thundercat sequential turn signals ♣ Explorer overhead console (temp/compass display) ♣ 2.25" off-road dual exhaust ♣ T-5 transmission swap completed Jan 2009 ♣