I bought a 01 Super cab F150 7700 that has the 5.4, automatic trans. Upon starting when really cold it sorta squeals I was thinking maybe time for a new serpintine belt but hadn't got the time to get it in and get it done then when I was going to pick up my girlfriend I was driving and started to hear what sounds like a bird chirping. It doesn't get faster with higher RPMs but you can't hear it (in the cab) until it hits roughly 1500 RPM then at that point it stays there until RPMs drop. I got home and poped the hood and can hear it when it is ideling very quietly not much but enough to notice when listening for it. Since it never speeds up with the more RPMs I was thinking that it probally isn't a belt or valvetrain or other internals and definatly not any bushings or wheel bearings since it does it while sitting in park but I just don't know what to think. Any ideas on a fix (serpintine belt new pulleys fan clutch?) Sorry it is so long. thanks in advance James

 

go to autozone and get stp "fanbelt dressings" it will stop the chirping. just reapply it if it comes back. good luck.

 

>go to autozone and get stp "fanbelt dressings" it will stop
>the chirping. just reapply it if it comes back. good luck.


Just spray it on the serpintine belt? Would a new serpintine belt help also (it isn't dry rotted or cracking so the belt still looks ok) thanks James

 

Sounds like two seperate problems to me a starting and engine problem and a potential engine vacuum noise.

The fact it started out as a cold start item would tell me that something in the system was getting stuck as it got colder, some bearings will seat themselves into grooves as the truck cools down. I doubt that problem is the belt (if it's not cracked or worn), although it may end up as part of it. Chirping noises from an older vehicle without the serpentine belt system may indicate a belt problem. In your case it's more likely the bearings in one of the drive components or too much armor-all spray in an engine dress up. The serpentine has a tension idler in the loop so it's as tight as it'll be. The spray on belt dressing is there to add stick'em power for a while and but it also wears the belt faster, as it causes the rubber to shrink a bit, which creates more friction(= wear). If it is the belt, when the spray dries out and the stick is gone it makes the chirp worse and may cause it to squeal.

The second problem sounds like the passenger compartment fan or a change in engine vacuum. What has me puzzled is you can't hear it until 1500 rpm in the truck cab and it doesn't speed up. While in the cab does the chirp go away when you put it into park? If so could this problem be unrelated to the engine chirp. To me it sounds like you've simply changed the amount of vacuum the engine is supplying.

Help me out here, tell me I've lost it, please

-Kerry

 

Okay it has started to get worse and I can't get ahold of the dealer I bought it from (newyears and christmas the salesman I bought it from has been gone and I want to make sure I get a deascent loaner vehicle) but will tommorow it is a little faster with more RPMs now and has got louder on start up and you can hear it from idel up inside the cab now (really annoying) and squeals for almost 30 seconds after a cold start. I am going to have them take a look at it. The noise is there with the heater on and off. The noise appears to be comming form the front of the engine assecory area hopefully they will beable to fix it quickly. Thanks for all ideas and hope that this clears up the possible cause (hoping just a serpintine belt will fix it). Thanks again James

 

Took the truck into the dealer today and it was squealing. They took it into the garage after I dropped it off. The mechanic said he didn't hear it so he checked for play on all accesories and ideler arm and couldn't find any. Put the belt on and called me I went down and the noise is gone! Same belt and everything sure does make me question what was causing it the best explenation they could give was maybe there was dirt on one of the pulleys. Sounds awfully funny to me. Anyone every heard of this?

 

Dirt, oil, grease, water, or antifreeze can all cause belt noises.

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I am just going to do a new one myself 5 minutes and 25.00 and hopefully it will go away. If not I am going to go insane! thnanks guys James

 

Mine did that right after i bought it, i think whatever the dealer used under the hood to make everything look nice made the belt slip. It sounds exactly like what youre describing. I took the belt off and cleaned it, since it appeared to be recently replaced. It solved my problem completely.

Tony Warren
Nebraska

 

In the Garage and Workshop forum there is a topic that gives a cleaning method to resurface your pulleys in case they get glazed and slip.


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