Intermittent knock from engine underneath car

JTGrant

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Feb 23, 2006

#1

• Feb 23, 2006

• #1

At first my car didn't have this problem. After I switched it to Mobil1 5w-20 it started this. At 5000 miles I changed to 5w-30 Syn. and it didn't do it has much. I switched it back to 5w-20 Mobil1. It sometimes does it, I don't think that it is the valve tsb. But it doesn't sound like a rod knock.

 

JTGrant

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Feb 26, 2006

#2

• Feb 26, 2006

• #2

It only does it sometimes, after the motor gets warm it does it less. If it was a main bearing or a rod knock then it would be there all the time and get louder as rpm increases. I'm not sure if it is the lash adjuster TSB or the VCT. Any advice woruld be great.

 

bigcat

start with the upper hole, and if more traction is

May 1, 2005

3,015

1

79

7200 feet

Feb 26, 2006

#3

• Feb 26, 2006

• #3

take it to the dealer and have them figure it out

 

JTGrant

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Feb 27, 2006

#4

• Feb 27, 2006

• #4

JTGrant said:

It only does it sometimes, after the motor gets warm it does it less. If it was a main bearing or a rod knock then it would be there all the time and get louder as rpm increases. I'm not sure if it is the lash adjuster TSB or the VCT. Any advice woruld be great.

Click to expand...

any ideas, I can't take it to the dealer right now. Time thing.

 

JTGrant

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Feb 28, 2006

#5

• Feb 28, 2006

• #5

should I return everything to stock before taking it for this?
C&L intake
LFP throttle body
sct tune

 

bigcat

start with the upper hole, and if more traction is

May 1, 2005

3,015

1

79

7200 feet

Feb 28, 2006

#6

• Feb 28, 2006

• #6

i would, it would only take about a short time. then you could see if it does it competely stock too.

 

JTGrant

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Feb 28, 2006

#7

• Feb 28, 2006

• #7

yeah i reset the computer back to stock and it did it then too, I checked everything today with a stethescope and found nothing. The noise is gone for now. I'll check it tomorrow and repost. The noise is intermittent then I'm no to concerned about it. I'm still going to take it to the dealer next week.

 

Mike97gt

it doe snot

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Jan 26, 1999

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Feb 28, 2006

#8

• Feb 28, 2006

• #8

i would not be that concerneed about it. a lower bearing noise is constant and is very loud. many engines give slight taping and knocking sounds

 

JTGrant

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Mar 1, 2006

#9

• Mar 1, 2006

• #9

svttech76 said:

i would not be that concerneed about it. a lower bearing noise is constant and is very loud. many engines give slight taping and knocking sounds

Click to expand...

yeah that is what I'm thinking, I am going to take it next week. Thanks

But at the same time I listen to another 2005 Mustang GT and it didn't do it. Only got to listen to it for a minute though.

 

JTGrant

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Mar 1, 2006

#10

• Mar 1, 2006

• #10

no knock at all today and I check everything with an auto stethescope.