Oringinal 6000 mile 2001 SVT with engine knock out the exhaust only?

I bought this 01 SVT with 3000 miles on it 7 months ago. In the last month it has developed a knock that sounds like a rod knock out the right rear of the exhaust. There are no Knocks coming from the engine upper or lower. I have only occasionally come close to red line. I changed the oil for the second time and there is not any visible metal in the oil or filter. This knock is there cold or hot but seems to go away above 3500 rpm, and its out the end of exhaust only. I have read on older threads and post that there was a problem with rod bearing in this SVT engine. Does this sound like the same thing. What are the latest fixes for this problem------replace rod bearings, replace short block or replace engine? Has anyone experienced this knock only coming from the exhaust? The only modifications I have made are Magnaflow mufflers about 7 months ago-----and there are no exhaust parts loose or broken welds.

You'd hear a rod knock at the engine if it was one. These motors don't have a problem with bearings, they're sensitive to being low on oil. Put in 7 qts when you change the oil and keep an eye on it as they use some.

You sure it's not the exhaust hitting something making the noise?

Its not like its hitting something kind of a knock. it more of a light dull knock/pop. It reminds me of when there is a bad valve with misfire and you get that intermittent pop sound but there is a definite light knock to it. The engine runs and idles smooth but just a little bit of a rough idle when AC is on. Went on a 700 mile road trip last month and it used no oil (5/30 syn.) Ive read that people put in 6 1/2 quarts or install a 7 quart pan. Is Using 7 quarts with stock pan the thing most everyone here does, and it doesnt cause any problems?

So you only hear the knock from the tail pipe? If that's the case I'd start tapping on the mufflers and cats and see if anything rattles around.

You don't need a larger pan to run 7 quarts. There's plenty of room in the stock pan. Everyone should be running 6.5-7 quarts in these engines. It has to do with the slow drain back from the heads. I ran 7 quarts in my 01 and I run that much in my 04. It doesn't hit the crank and the reserve doesn't hurt.

My car does that at idle too. Just a really slight pop every now and then. Sounds like a boat at idle. Think it's a tiny bit of fuel burning off. Happens a little more with blower now too. Assume its from a tighter gap and colder plugs.

I bought my car new and have run 7 qts of oil in since the first change at 500 miles. The car has 60,000 something miles and runs perfect.

This is all the time and is very loud on start up, but only out the exhaust not from engine. Went to shop and they cant find any indications that it is coming from the engine, also they find no exhaust problem. Im starting to think it is a leaky exhaust exhaust valve

Can you post a video?

After 9 months since i posted this thread, here is what ive figured out so far. As it turns out I hear this pop pop burbling knock sound that is at the tail pipe only and mostly on the right side only----------Well I have noticed that I hear this on all modular fords with straight through exhaust, I have even heard it on a 2014 Shelby Cobra Mustang with the 5.4 supercharged. I even hear it out of my Ford F150 5.4 with single exhaust but not as noticeable. RX1Coabra above says he hears it from his all the time. So I know its not an engine knock but it drives me crazy because for me it ruins the sound of my Magnaflows at Idle and low speed. After alot of searching on this the best that I came up with is that the sound may be related to the E.G.R. valve, but I dont see how that could be. Anyways Im thinking about putting my stock mufflers back on to lessen that noise. I brought this to the attention of that Shelby Cobra Owner, he said he had never noticed it but now that I pointed out to him, he says it is driving him crazy also. LoL.

Any other ideas or thought on this??

you should try and post a video of it so the guys on here can better understand the sound you are referring to.

There's a 4V burble all the Cobras have. It's more noticeable with some exhausts. EGR isn't active at idle.

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2014 GT500 is a 5.8

His was a cobra and maybe it was a 14, he told me it was a 5.4 and it was supercharged.

Almost anybody with a modular engine and a straight through exhaust will hear this noise if they go to the back of the car, its like a separate noise from the rest of the exhuast note. hard to describe, a dull pop or ping or light knock. sometimes it fades in and out just a little but always there at idle and low rpm. Im sure most of you here have the same thing but havent noticed it.

The 14's were Shelbys as well. The 04 was the last "Cobra". In 07 it went back to Shelby GT500. But all the Shelbys are 4V as well.

Are you running an aftermarket MAF? I've noticed Cobras with aftermarket MAFs have a funky idle at times.

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slo984now said:

The 14's were Shelbys as well. The 04 was the last "Cobra". In 07 it went back to Shelby GT500. But all the Shelbys are 4V as well.

Are you running an aftermarket MAF? I've noticed Cobras with aftermarket MAFs have a funky idle at times.

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You are right it was a Shelby 500.----------- No problem with idle, just the noise

Same pop on my Cobra. I notice it’s louder at cold start too. I believe it’s extra fuel being burned off and popping in exhaust. I have single cat h pipe and Mac catbacK FWIW.

I have magnaflows on my gt500 but have never heard this... I'll go listen for it and see if I can tell.

Palacios289 said:

Same pop on my Cobra. I notice it’s louder at cold start too. I believe it’s extra fuel being burned off and popping in exhaust. I have single cat h pipe and Mac catbacK FWIW.

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I guess it could be fuel, but to me it doesnt sound like it,-- -the pop has a slight hollow ring to it.

My pop sound is the same with a hollow sound to it. Rod noise is unmistakeable as it's more or a clicking sound that gets louder with RPMS. Go on youtube and look up Cobra rod knock. The sound is very much different. Trust me. I drive me Cobra hard. If it was a rod or main, I would have blown this motor up a long time ago! Just keep 7 quarts in the oil pan and your gold to go

BTW, if it was a rod, you would definetly know it above 3500 RPMS where you say the noise goes away. A rod knock doesn't go away with RPM. It gets much louder.

Palacios289 said:

My pop sound is the same with a hollow sound to it. Rod noise is unmistakeable as it's more or a clicking sound that gets louder with RPMS. Go on youtube and look up Cobra rod knock. The sound is very much different. Trust me. I drive me Cobra hard. If it was a rod or main, I would have blown this motor up a long time ago! Just keep 7 quarts in the oil pan and your gold to go

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Yeah I have ruled out rod knock quite a while ago, Kind of going along with your extra fuel theory I think that could be tied in with a possibility that it could be the egr valve , maybe something inherent the way its works with the modular engines.---------I hate how the noise kind of ruins the magnaflow sound at idle and low rpm.