2k-2.8k rpm "Glasspack" Sound from motor?

88GTStreetRod

Member

Jan 5, 2004

376

1

18

76

USA

Nov 11, 2006

#1

• Nov 11, 2006

• #1

When driving my car between 2k and 2.8k rpms (in any gear) I hear what sounds like an exhaust leak or the valves "clapping" really hard. I have tried to replicate the sound in the driveway out of gear and I can not replicate. I would think if I had an exhaust leak, I would hear it all of the time, same with the valves. Once I pass 3k or below 2k, I do not hear it.

Any idea what this might be??

 

Darkwriter77

Resident Ranting Negative Nancy

5 Year Member

Jul 1, 2005

314

281

134

Apache Junction, AZ

Nov 11, 2006

#2

• Nov 11, 2006

• #2

Pinging? Mine sounds a little bit like that when I'm experiencing ping, and it's only while under a load. What's your timing/octane?

 

88GTStreetRod

Member

Jan 5, 2004

376

1

18

76

USA

Nov 11, 2006

#3

• Nov 11, 2006

• #3

I also thought that... I am running 15 degrees timing and 93 octane.

 

HISSIN50

"How long does it take to get help in here?

15 Year Member

Nov 29, 1999

31,179

34

129

Nov 11, 2006

#4

• Nov 11, 2006

• #4

I'd double check for an exhaust leak.

Good luck.

 

88GTStreetRod

Member

Jan 5, 2004

376

1

18

76

USA

Nov 12, 2006

#5

• Nov 12, 2006

• #5

HISSIN50 said:

I'd double check for an exhaust leak.

Good luck.

Click to expand...

would'nt you think you would hear and exhaust leak all of the time?? But I guess if the engine is "twisting" under torque it could happen.

 

HISSIN50

"How long does it take to get help in here?

15 Year Member

Nov 29, 1999

31,179

34

129

Nov 12, 2006

#6

• Nov 12, 2006

• #6

I've had a few small leaks that were heard only under certain situations, like WOT from 2-3K RPM.

 

88GTStreetRod

Member

Jan 5, 2004

376

1

18

76

USA

Nov 12, 2006

#7

• Nov 12, 2006

• #7

HISSIN50 said:

I've had a few small leaks that were heard only under certain situations, like WOT from 2-3K RPM.

Click to expand...

I can not find any noticable leaks, I guess I will have the remove the headers and re-install. Thanks for the tip.

Any other ideas incase the headers are not the cause?