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Old 07-15-2017, 02:34 PM   #1
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Default 03 Cobra - Rattling noise from front of engine

Just recently my 03 Cobra engine has developed a slight noise seemingly coming from the front of the engine. Itís difficult to describe, but it basically sounds like a brief rattling noise which occurs twice per second at 750 RPM (idle). If I raise the RPMís, the frequency of the noise changes with the RPM, so if I rev up to 1500 RPM, the noise will occur four times every second. If I rev high enough, it seems to go away.

At first I thought it was the belt since it sounded exactly like the belt making two revolutions per second, but the belt seems fine. The only other thing I can think of is that it has something to do with the timing chain, maybe a bad guide, tensioner or chain.

Also, I seem to get a slight whiff of burnt oil shortly after I start the car when itís cold. Itís almost undetectable, but Iíve noticed it now twice. I checked for oil leaks and found none. Not sure if itís related, but it started at the same time the noise started. Are the timing chain tensioners on this engine hydraulic, filled with oil and maybe leaking?

The car runs perfectly fine and performs normally otherwise. Not sure if this is a clue, but I donít drive the car much, so it sits in the garage for sometimes two weeks or more at a time. In winter it sits even more and is only taken out on nice days.

Anybody have any ideas? Are there any known issues with 03, 04 Cobra timing chains or related hardware? Not sure where to even start here.
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Old 07-15-2017, 03:39 PM   #2
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Could be a pulley issue, which these cars are notorious for having problems with the stock ones. You don't have the billetflow upgraded pulleys do you? Even if the belt looks fine too it could still be that, as it expands over time and it will not create enough tension on those picky pulleys.

Just out of curiosity, how many miles are on the car, and have you ever changed the supercharger oil? If you haven't and it has some decent miles on it, that could be the issue. it could be all drying up and thick like molasses and not lubricating the inside of the supercharger.
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Old 07-15-2017, 04:07 PM   #3
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I have billetflow pulleys all around and changed the supercharger oil about 10K miles ago. The car has 45K miles.

I don't think it's a pulley since the noise wouldn't be as methodically repetitive as it is. Tension on the belt is good.
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Old 07-15-2017, 04:10 PM   #4
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hmmmm, try uploading a cellphone video later when you get a chance. Would probably help a lot in determining what it is if people can hear it.
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Old 07-15-2017, 06:44 PM   #5
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Broken rocker arm? I think this was also common on our cars
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Old 07-15-2017, 07:29 PM   #6
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I had a couple spark plugs work loose in my Cobra. Check them before the threads are destroyed or you will need to add inserts. Thanks to John (forget his screen name but he was popular and prolific on CSVT) for helping me with the inserts. He's a good guy.
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Old 07-16-2017, 10:30 AM   #7
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Ok, here is a short video of the noise where you can clearly hear the knocking. Also, I don't know why there seems to be a loud whirring noise in this video. The whirring noise isn't nearly that loud when you're standing in front of the car. I think it's an anomaly of the phone camera mic.

Also, I checked all the plugs and they're snug.

https://sabercathost.com/4X9z/Engine_Noise.mkv
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Old 07-16-2017, 01:53 PM   #8
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I'm not going to download anything from Sabercat. Can you host it on youtube?

I was hoping it would be the plugs because that's a simple repair.
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Old 07-16-2017, 01:56 PM   #9
 
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Take your car to someone like Hans at Deans Performance. He's an expert with the 03/04 Cobra
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Old 07-16-2017, 04:41 PM   #10
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Deans is pretty far from me. Know of any good shops near the north suburbs?
Wasn't there a decent place near the Schamburg / Palatine area at one time? Are they still there?
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Old 07-16-2017, 04:54 PM   #11
 
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Not sure. Speed Inc. maybe.
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Old 07-16-2017, 04:56 PM   #12
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Quote:
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Deans is pretty far from me. Know of any good shops near the north suburbs?
Wasn't there a decent place near the Schamburg / Palatine area at one time? Are they still there?
Drew at DMarkPerformance DMP – Performance/tuning

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Old 07-16-2017, 05:05 PM   #13
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Yes, Speed Inc. is what I was thinking of, but I checked and they only do GM stuff now.

DMP looks good and is a LOT closer. Thanks for the info Venomous.
I'll give Drew a call tomorrow.

This whole situation is making me sick. I love the car and have always gone out of my way to take very good care of it. This is the first "real" problem I've had with the car in 14 years.

Not sure what could have happened. I drive like a granny and the engine rarely ever sees anything over 3000 RPM.
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Old 07-16-2017, 05:27 PM   #14
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It could be a multitude of simple things. If it's still running fine, i wouldn't get too worked up about it. Drew will check it out and take good care of you.
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Old 07-30-2017, 10:12 PM   #15
 
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Any updates?
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Old 07-31-2017, 05:54 AM   #16
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Update: It was the water pump.

I wouldn't think a water pump would make that kind of noise, especially at those intervals, so I didn't check it at first, especially since it's no fun to get to.

New water pump and noise gone. I guess I got all worried for nothing.

I still gotta bring the car to Drew at Dmarkperformance for the transmission issue. I can't seem to figure that one out.
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Old 07-31-2017, 07:17 AM   #17
 
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Quote:
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Update: It was the water pump.

I wouldn't think a water pump would make that kind of noise, especially at those intervals, so I didn't check it at first, especially since it's no fun to get to.

New water pump and noise gone. I guess I got all worried for nothing.

I still gotta bring the car to Drew at Dmarkperformance for the transmission issue. I can't seem to figure that one out.
See how my car is coming along when you're there.
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Old 07-31-2017, 03:07 PM   #18
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See how my car is coming along when you're there.
its parked outside with the chevys
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Old 07-31-2017, 04:09 PM   #19
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See how my car is coming along when you're there.
dirty mike and the boys took it over.

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Old 07-31-2017, 07:43 PM   #20
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It's probably your water pump.
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Old 07-31-2017, 08:32 PM   #21
 
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dirty mike and the boys took it over.

It's cool, the interior is getting replaced anyway.
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Old 07-31-2017, 08:33 PM   #22
 
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its parked outside with the chevys
Will you take a 93 Cobra roller in on trade? Cant have a Cobra that's been hanging out with Chevys.
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Old 07-31-2017, 08:37 PM   #23
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Quote:
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It's probably your water pump.
See post 16. But I was going to say the same thing.
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