Posts: 1530
From:Antelope, CA
Registered: Jun 99

posted 07-18-2000 08:59 PM               

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Well I have been working on my dads '88 5.0 w/ an AOD trying to figure out this annoying chirping sound. The car is 100% stock. When accelerating with any real amount of gas pedal you here this loud chirping which is directly related to rpm (higher the rpms the louder and more rapidlt it happens). It happens at lower rpms, louder and more often when starting off cold in the morning but still only when accelerating. When you let off the gas, it shuts up. It seems to be coming from the drivers side of the engine compartment. I can get it to do it in reverse, all forward gears, and in neutral and park when sitting still (does it ~3500 rpm when sitting). Since it does it when sitting still that rules out stuff like brakes. Tranny fluid is good, right level, not bubbley or burnt and it shifts great. There does not seem to be a loss in power (and no coders) but its very annoying and gets a lot of bad looks from other drivers. I have pulled the speedo gear to disable the speedometer and take the cable out of the equation, still makes the noise. I also pulled the belt off, still made the noise ruling out belt driven components.

The doing it more when cold has me thinking possibly a bad lifter. At first I was thinking a loud injector but it probably wouldnt matter how cold it was. No, it does not sound like detonation (plus it would be the opposite, would happen more when warm :>). Alrighty, give me suggestions and ideas guys :>). Thanks all.

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Tim
1965 Mustang coupe, 200 ci w/ a Holley 2300, Clifford header, and true duals w/ 26" Smithys
come.to/65mustang

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Posts: 2840
From:Monterey, CA Mustangsandmore Member #437
Registered: Apr 2000

posted 07-18-2000 09:21 PM               

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Uhhh, Tim, it sounds to me you covered everything I coulda thought of!

And since you said chirping, that would eliminate any type of bearing knock.

Since I have a 5speed, I couldn't comment on the AOD. I do know that my cats have recently started vibrating while cold, but that's far from a chirping sound.

Sorry man, I just don't have enough knowledge to help you, but I will email this to a friend who has a 1989 AOD 5.0

He knows a lot about 'stangs too, and I usually ask him when I have questions. Maybe he'll know something. I'll keep ya posted.

Stewart

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1990 Platinum GT
- Some mods, but not enough!

1996 Blue Crown Vic
- Suspension and exhaust mods, but nothing available for the engine!

Blue Oval Believer, thru and true

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Posts: 815
From:Lyons, ILL, USA
Registered: May 99

posted 07-19-2000 11:36 AM               

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Hey Tim,

Hmmmmmm. Chirping? Drivers side? Idle? No belt? Are you posetive it is on the drivers side? Look at the Emissions crossover tube at the back of the heads. Also, look at the 2 check valves. If 1 has gone bad, it might mame a noise. Do you notice if the speedo works ok All the time? The speedo cable might need to be lubed with graphite cable lube. Sometimes that will cause what you are describing. Of course without hearing it, its hard to say.

Tony.

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Posts: 1530
From:Antelope, CA
Registered: Jun 99

posted 07-19-2000 06:15 PM               

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It doesnt do it at idle Tony. I am not 100% positive that it is coming from the drivers side. What 2 check valves are you talking about? On the emissions tube? I had been thinking that a check valve letting go and catching could easily make this noise but couldnt think of any at the time :>). The speedo cable was my first thought and thats why I took the cable out of the tranny but it still made the noise (without speedo working) so its not anything speedo related.

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Tim
1965 Mustang coupe, 200 ci w/ a Holley 2300, Clifford header, and true duals w/ 26" Smithys
come.to/65mustang

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Posts: 815
From:Lyons, ILL, USA
Registered: May 99

posted 07-20-2000 11:06 AM               

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Ok, that Idea goes out the window! The check valves are on the passenger side. There are 2. 1 comes off the crossover tube, which runs from head to head in the rear and hooks around. The second valve is connected to the tube that runs to the Converters. You did say you thought it was coming from the drivers side though. That is kind of confusing since there really is nothing there to be making noise. Unless the Crossover tube is making noise. I am about to be working on a 90 GT for a tune up. I will look and see if I think of anything else to look at.

Dumb question too. Have you looked at the front pads at all?

Tony.

[This message has been edited by Capri (edited 07-20-2000).]

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Posts: 1530
From:Antelope, CA
Registered: Jun 99

posted 07-20-2000 08:20 PM               

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I will check those two valves out this weekend. It did it without moving without my foot on the brakes so its not the brakes. Plus I did look at them and they are in very good shape :>).

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Tim
1965 Mustang coupe, 200 ci w/ a Holley 2300, Clifford header, and true duals w/ 26" Smithys
come.to/65mustang

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Posts: 815
From:Lyons, ILL, USA
Registered: May 99

posted 07-20-2000 11:32 PM               

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Hmmmmmmmm. So lets see. It does it when it is running in gear and out of gear, moving or stopped, and sounds like its coming from the drivers side. Does it do it with the air on or off? How about when you are turning the wheel, or not turning the wheel? Do you notice it when you are in the car and under the hood? Does it sound as if it is from the fron or rear of under the hood, or like its from elsewhere?

Confused yet? lol

Tony.

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Posts: 1530
From:Antelope, CA
Registered: Jun 99

posted 07-21-2000 01:40 AM               

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Does it with the air on and off, with and without touching the steering wheel. It seems to be coming from anywhere but the front of the engine :>) but more towards the rear and I still am not 100% sure on the drivers side thing. The problem with hearing the noise when not driving and under the hood is all the other noises. Its hard to pinpoint where it is coming from (louder and more often when driving, like I said have to get it to about 3500 to hear it when parked). I need to find a way to record this stupid sound :>).

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Tim
1965 Mustang coupe, 200 ci w/ a Holley 2300, Clifford header, and true duals w/ 26" Smithys
come.to/65mustang

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Posts: 8709
From:Phoebus Virginia,USA 1968 Fastback & 1995 Vert MCA#39406 M&M #12
Registered: May 99

posted 07-21-2000 06:55 PM               

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Tim,
will your digital camera do MPEGs?
if make one
sam

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Posts: 1530
From:Antelope, CA
Registered: Jun 99

posted 07-21-2000 07:58 PM               

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I can capture sound with my dig camera, just dont know how good it will sound. Will try and try it out this weekend (I wish my laptop didnt crap out on me :>).

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Tim
1965 Mustang coupe, 200 ci w/ a Holley 2300, Clifford header, and true duals w/ 26" Smithys
come.to/65mustang

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Posts: 815
From:Lyons, ILL, USA
Registered: May 99

posted 07-23-2000 02:52 PM               

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Hey Tim,

Just bring it here so I can listen to it! lol

Tony.

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Posts: 157
From:n.y. n.y.
Registered: Jun 2000

posted 07-25-2000 10:49 AM            

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Is anything rubbing?Sounds weird but my friend had the weirdest cricket type chirping in the front of his 89 GT.It only did it in certain rpm's it was tough to figure out.We found the rear of the hood just barely rubbing on the cowl.Have you checked all of your vacum connections?How about the pcv valve those grommets tend to get brittle and leak with age.Good luck.

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Posts: 5491
From:Lyons, IL, USA
Registered: May 99

posted 07-25-2000 11:39 AM               

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It sounds like a loose torque converter or inspection plate converter rubbing noise to me. Jack the car up and remove the torque converter inspection cover. Check the clearance and bolt tighness. Alex

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Alex Denysenko Co-Administrator and Moderator
Fleet of FoMoCo's too long to list! http://superstockers.homestead.com/week.html

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Posts: 127
From:S.F., CA
Registered: May 2000

posted 07-31-2000 11:05 AM               

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Tim, just wondering if you found the problem? This might not be it but... I just has a similar problem on my 200. I found that my PVC hose was getting sucked closed at certain rpm's. Maybe you could check some of your vacuum hose's.

...Marco

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Posts: 1530
From:Antelope, CA
Registered: Jun 99

posted 07-31-2000 08:14 PM               

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The sounds I got didnt get the noise so that didnt work (need to fix my laptop then take that out) :>(. I pulled the inspection plate off and clearances are good and bolts are tight. I put the plate back on with some rtv in case it was that rattling but no dice. It does the sounds both moving and sitting still and with the hood up. I have checked all hoses. My brain is pointing me towards something in the engine :>(.

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Tim
1965 Mustang coupe, 200 ci w/ a Holley 2300, Clifford header, and true duals w/ 26" Smithys
come.to/65mustang
https://mustangsandmore.com/ubb/I65Stang.html

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Posts: 695
From:Sioux City, Iowa
Registered: Oct 99

posted 07-31-2000 10:30 PM               

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dry u-joints

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Joe
71 Coupe
302 w/2x4
and almost lame 3.00 gears

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Posts: 815
From:Lyons, ILL, USA
Registered: May 99

posted 08-13-2000 10:49 PM               

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Hey Tim,

This is stupid, but do you hear it with the top up or down? Does it matter? I sure wish I had a way of hearing this noise. I can think of a few things but they are hard to pinpoint over the net!

Tony.

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Posts: 1530
From:Antelope, CA
Registered: Jun 99

posted 08-13-2000 11:21 PM               

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You can hear it with both the top up and down. U-joints are going to be replaced next week as I havent had time to do them yet(one is on its way out, it clunks when you change gears [park to reverse, neutral to drive]). I have never heard a u-joint make this noise but if that solves the problem good :>). I am still trying to think of a way to capture the sound better.

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Tim
1965 Mustang coupe, 200 ci w/ a Holley 2300, Clifford header, and true duals w/ 26" Smithys
come.to/65mustang
https://mustangsandmore.com/ubb/I65Stang.html

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Posts: 1530
From:Antelope, CA
Registered: Jun 99

posted 09-03-2000 04:48 PM               

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Well here is an update. The u-joints were replaced yesterday. The sound is there but not as loud and my dad wont ever notice it (I only got it to do it when flooring it and even then it wasnt bad at all and not loud) :>). So, the u-joints seemed to cure it for the most part, perhaps something is a lil unbalanced or off so thats causing the left over. Thats strange, never would have thunk that was the noise :>). So the 5.0 is now very liveable and wont get stared at anymore except when loosing traction off the light (I had to have a lil fun while testing it :>). BTW, I should have my 5.0 project car within a month (I know I keep sayin that but its true this time :>). Gonna give my parents one last chance to sell me the vert and them get an economy car :>). Thanks all and I will be back if it come back :>).

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Tim
1965 Mustang coupe, 200 ci w/ a Holley 2300, Clifford header, and true duals w/ 26" Smithys
http://all.at/mustang
https://mustangsandmore.com/ubb/I65Stang.html

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Posts: 1530
From:Antelope, CA
Registered: Jun 99

posted 09-03-2000 08:21 PM               

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Update on the update, I just talked to my dad and it turns out it has been quiet for a lil while now before the u-joints were ever replaced so it is still a mystery. Would have been nice if he had told me this :>).

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Tim
1965 Mustang coupe, 200 ci w/ a Holley 2300, Clifford header, and true duals w/ 26" Smithys
http://all.at/mustang
https://mustangsandmore.com/ubb/I65Stang.html

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Posts: 815
From:Lyons, ILL, USA
Registered: May 99

posted 09-05-2000 07:21 PM               

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It figures, dont it? The mystery lives on!

Tony.

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