Hammer time? What was that noise under the hood?!

They may not have used OEM glass. Some of the aftermarket ones don't come with the filament lines in the lower part for the heated windshield wipers.
 
BFE
Northern MN

Same thing...

I have the lines in the windshield. I just think they aren't connected to anything. Not sure what it takes to makes the connection but I get ice build up on the wipers. Then again, maybe that's not the idea.
 
ya when you posted the pic, i was like DAMN that must be MN or the artic circle, the BFE led me to belive it was the latter of the two

sneaky little ninja editer
 
luttersj said:
please excuse the noob question: is "rod knock" a bad thing? (I'm afraid to Google it) I know it sure doesn't sound good!

I was all prepared to make an audio recording of the noise this morning but, of course, nothing happened. I'll probably still call the mechanic to see what he thinks but it'll be pretty hard to diagnose without hearing it I would assume.
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well i could explane it better but you dont wanna know..................really! basicaly when it makes that noise consistantally its time for a new engine.

i agree that it cant be fully diagnosed without at least a audio clip, so keep trying to record it. i would first check your oil level, if its ok go back to dealer that changed oil tell them whats happening and ask for your oil and filter to be changed again, you still might have to pay, depends if they are "ok" but think of it as cheep insurance if you do (ive seen filters fail before) and see if the knock continues
 
I think I've heard the same noise a few times, but only when it's "ass-bitin' cold" out there (as a friend of mine used to say). I heard it Monday evening when I left work; it sounds kind of like "thu-thu-thu-thu-thunk" repeated several times, at progressively shorter intervals until it goes away. At first, I thought it was the pump pressurizing the ABS system, or something like that, but after hearing it Monday, I think it's the idler/tensioner arm on the serpentine belt. To me, it sounds like the pulley on the tensioner isn't spinning freely, like the grease may be nearly solidified, so the belt is pulling it out of position, then the pulley slips a bit, then finally releases, and the big "thunk" at the end is the tensioner arm hitting the stop. Then the pulley sticks again, and the belt pulls the arm out of position, starting the cycle over again.

If it's not bitter freaking cold, it is manifested as a RPM-dependent squeak; I think the "extra" cold just makes the underlying problem worse.

The aggravating thing is that Lincoln replaced the idler arm and serpentine belt on my LS last spring for this very reason...
 
I was thinking collapsed lifter, but AFAIK the 3.9 doesn't have lifters. (we are talking about the 3.9 right?) :shifty:
Could be a sticking valve.
 
chickenviii said:
well i could explane it better but you dont wanna know..................really! basicaly when it makes that noise consistantally its time for a new engine.

i agree that it cant be fully diagnosed without at least a audio clip, so keep trying to record it. i would first check your oil level, if its ok go back to dealer that changed oil tell them whats happening and ask for your oil and filter to be changed again, you still might have to pay, depends if they are "ok" but think of it as cheep insurance if you do (ive seen filters fail before) and see if the knock continues
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Yeah...I figured rod knock couldn't be good.

I called and talked to my usual service guy (never a good sign when you have a usual service guy) and we talked about it. I told him this knocking noise has happened twice in the last week along with a strange starting problem (see: different thread). He offered to give me a loaner and let the car sit all night so he could hear it in person. But I decided to give it some time to see what happens. Like a week or so. I want to be able to hear it once more so I can explain it better to him and maybe record it. But he stressed that I get it in before the warranty runs out and get it documented that something is going on. I just hope I can get it to do that again. And it might be related to the cold weather. But this morning was the coldest day yet (-15F) and nothing happened. yesterday was -5F and it did it. The first time, in the evening, it was above zero. So I don't know....I guess I just keep trying to record it.
 
97stscaddy said:
I was thinking collapsed lifter, but AFAIK the 3.9 doesn't have lifters. (we are talking about the 3.9 right?) :shifty:
Click to expand...
No lifters, but it does have tappets (technically, DAMBs--Direct Acting Mechanical Buckets). Hoo-ray for mechanical valvetrains! :D
 
CrackerJack said:
Pek, looks like we found a 5th member to the MN gang? haha
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luttersj has been around for a while. By the looks of it, it might be just me and him going to Brainerd to the road course. It's going to be a blast!
 
Dont feel bad i've experenced this too, only when its below 40 outside though, went to every ford engineer I could find when I still worked for them and they had absolutely NO idea for certain, one of them told me that on systems with gen 3 and gen 4 deatc climate control it pulses the ac compressor on and off extremely quickly because the refridgerant and oil settle, when cold they are quite noisy, another told me that he thought for some reason it may be pulsing the throttle plate due to it sounding like it was originating from the intake mani, or upper part of the engine
 
Follow up: I just got the car back from the dealership yesterday. I had them check into the knocking sound. They didn't hear the noise (of course) but they found a TSB that talked about an idler pully in the serpentine belt system malfunctioning. It would allow the belt to begin to walk off the edge of the pulley. It would get to a certain point and then snap back into place causing the knocking noise. apparently they use a pulley from Jaguar for the fix.

I was satisfied with this answer because I had just gotten a new serp belt the last time it was in. It was after that visit that I heard the knocking. So hopefully that problem is all taken care of.
 
T_Man said he recently replaced the idler pulley on his serpentine belt, and it had a revised part number. That indicates that there is a revised design for the pulley, which jives with what your dealer said--hopefully that'll fix it. One of these days, I'll have to take mine in and get it fixed, too...
 
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