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Discussion Starter · #1 ·
I noticed an odd noise coming from the front of my engine around the serpentine belt setup, so I figured it was a failed tensioner bearing, or AC compressor bearing, or something along those lines. It wasn't affecting the car in any noticeable way, so I put off bringing the car in until yesterday. The dealer looked into the noise, which they described as "marbles," or "metal on metal, that sounds almost like a vacuum leak," and came to the same conclusion I did. They first checked for vacuum or boost leaks, and found nothing. Then took off the pulley system, and the noise was still present... Next they brought out their stethoscope & bore scope, and couldn't pinpoint what or where this noise is coming from. After that they put the car on the dyno and there was no measurable loss of power or any codes whatsoever...

So I'm going to be without my ST for a week+ while they try and figure out what is going on. But on the upside, the dealer gave me a '16 F150 XLT, ecoboost, 4WD, crew cab to drive. While it's no ST, and the interior is a far cry from my leather Recaor's, it is a very nice truck. And it's kinda fun to be sitting so high up.

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Discussion Starter · #2 ·
I got a call from the dealer Friday. They finally found the problem. The noise was coming from the oil pump. Still waiting to hear back if there was any other damage, or if the oil pump was not working, or just making noise... But while I wait, has anyone else ever had this issue?
 

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Does it sound like this? I'm not talking about the constant engine noise but rather the marble/metallic clacking that does not go in rhythm with the engine

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That's a video of my engine way back when it was just a baby. It's at 46k now and no issues ever came up from that sound.

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That sounds totally normal to me. It is a strange sound. I've always wondered what causes it. Had the same sound on a previous car that was also a turbo 4 cylinder.
 

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Does it sound like this? I'm not talking about the constant engine noise but rather the marble/metallic clacking that does not go in rhythm with the engine

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Ey Sullyman, got a normal focus 1.5, not an ST, and my car sounds similar to yours, but only when fully warmed. Here it goes the video, you can hear it from 4:00.


Does it sound like yours??
 

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Ey Sullyman, got a normal focus 1.5, not an ST, and my car sounds similar to yours, but only when fully warmed. Here it goes the video, you can hear it from 4:00.


Does it sound like yours??
That doesn't sound like mine. You have the usual engine noise but yours also has a noise that goes with the engine rotation. The noise on mine is random and sounds more like somebody shaking a jar of marbles out of sync with the engine.
Your noise could be totally normal I'm not really sure. You could bring it into Ford but you know how that goes. They wont hear it. If it were me I would drive it and see if the sound gets worse.

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Discussion Starter · #8 ·
Does it sound like this? I'm not talking about the constant engine noise but rather the marble/metallic clacking that does not go in rhythm with the engine
Yes. Same sound I heard. And as yours, it was much louder when I put my ear near the wheel, as opposed to near the top end. I just picked it up from the dealer, and they replaced the oil pump. After finding the sound was coming from the oil pump, and inspecting the unit, one of the oil pump bearings was "too tight" and had failed causing the sound. All covered under warranty. Now it sounds like a normal turbo four cylinder with the normal high pressure fuel pump clacking.
 

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Discussion Starter · #9 ·
That sounds totally normal to me. It is a strange sound. I've always wondered what causes it. Had the same sound on a previous car that was also a turbo 4 cylinder.
I believe your referring to the high pressure fuel pump noise. It's like a valve tick or clacking. The first car I had with this system was my 2010 VW GTI, and it was called FSI and later TFSI. It was a lobe on the camshaft that triggers the fuel pump, and that's the noise your hearing. We are referring to a scratching, or marbles like sound underneath that clacking.
 

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I believe your referring to the high pressure fuel pump noise. It's like a valve tick or clacking. The first car I had with this system was my 2010 VW GTI, and it was called FSI and later TFSI. It was a lobe on the camshaft that triggers the fuel pump, and that's the noise your hearing. We are referring to a scratching, or marbles like sound underneath that clacking.
I am aware of the hpfp sound, and it isn't what I'm referring to either. It sounds like you stuck your hand into a bag of marbles, or almost like those gimmick giant funnels that you roll quarters into for charity. My past car that made the same sound was a b6 A4 with a 1.8t. This engine, as you're probably well aware, was pre-direct injection, so no fuel pump sound there. It never turned out to be an issue in 20,000 miles, even after big turbo and beating the car daily.
 

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Discussion Starter · #11 ·
I am aware of the hpfp sound, and it isn't what I'm referring to either. It sounds like you stuck your hand into a bag of marbles, or almost like those gimmick giant funnels that you roll quarters into for charity. My past car that made the same sound was a b6 A4 with a 1.8t. This engine, as you're probably well aware, was pre-direct injection, so no fuel pump sound there. It never turned out to be an issue in 20,000 miles, even after big turbo and beating the car daily.
Thank you! I couldn't remember what it was called.
And yes, we are talking about the same sound then. My apologies. Mine turned out to be a defective bearing in the oil pump. I do know the 1.8t (while not a fan of the engine personally) as my mother had a 1.8t Passat, and my friends had various Audi's and Mk4 VW's with that engine. If you were hearing this same noise in that engine, chances are it was a failed tensioner pulley bearing, or the idler pulley bearing.
 

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Thank you! I couldn't remember what it was called.
And yes, we are talking about the same sound then. My apologies. Mine turned out to be a defective bearing in the oil pump. I do know the 1.8t (while not a fan of the engine personally) as my mother had a 1.8t Passat, and my friends had various Audi's and Mk4 VW's with that engine. If you were hearing this same noise in that engine, chances are it was a failed tensioner pulley bearing, or the idler pulley bearing.
Interesting to know! I don't doubt it one bit. I probably traded it in just before it failed :sorry: By today's standards, the old 1.8t is an archaic design. It's pretty astonishing to see the amount of power we are getting with our 2.0 compared to the old port injection engines. Even with the bigger turbo (Frankenturbo k04 hybrid) I was only making 240 whp. Of course there was more drivetrain loss too (it was quattro), but this engine makes substantially more power, even with a smaller turbo.
 
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