exhaust leak or engine knock

Reply Subscribe

Thread Tools

Search this Thread

04-12-2007, 09:43 PM

#11

sfi

3rd Gear Member

Join Date: Apr 2004

Location: Temperance,MI

Posts: 653

RE: exhaust leak or engine knock

I've had that noise for years, and every mech told me it was ok. Though no one can explain what it is ?? I just had my car tuned again professionally and it's stil there(so I know it's not a timing issue, I run 93 octance also???)I havn't tightned my MAC LT since the've been on. How the heck did you tightnen your bolts. IM all ears. I can't get a socket in there for the life of me. My noise comes form the drivers side and sounds like it's inside the engine on the bottom half. It almost sounds mechanical.

04-12-2007, 09:59 PM

#12

JimboGT01

3rd Gear Member

Thread Starter

Join Date: Jun 2006

Location: Houston

Posts: 683

RE: exhaust leak or engine knock

i have a tubular k member so it makes it a little easier but my noise also sounds mechanical

04-12-2007, 10:20 PM

#13

95xbird

Join Date: Aug 2006

Location:

Posts: 49

RE: exhaust leak or engine knock

I say it's an exhaust leak.

When I had my exhaust leak after I installed my headers I thought I was able to get in there to tighten the bolts.The leverage just wasn't there.I tried to tighten them about 10 times before I pulled the motor.Every time I tightend them I got about 5 turns out of them until I felt that they were tight.In all reality I had no leverage and they were still very loose.Just on the pasenger side though.And leaked only until the engine got hot and the gaskets would expand.It was a nasty ticking noise.

When I pulled the engine I realized that the most rear bolt had vibarated all the way out and the others were still loose.I installed and torqued the headers onto the new motor and installed the new motor with the Headers already on and I have no leaks what so ever.

04-12-2007, 10:23 PM

#14

PWORLDSTANG

4th Gear Member

Join Date: Jul 2006

Location: Pittsburg, CA (BAY AREA!)

Posts: 1,399

RE: exhaust leak or engine knock

Quote:

ORIGINAL: rbstang

Quote:

ORIGINAL: PWORLDSTANG

^^ +1 on what they said. I have an exhaust leak. It sounds a lot like a car pinging.

Knock sounds different. Knock sounds literally like metal knocking hard against something else that's metal. It's a horrible sound.

Fortunately for you, and exhaust leak can be fixed. They are somewhat common with long tubes though. And sometimes they do come back after you fix it. But just make sure you replace the gasket and retighten everything.

pinging doesnt really sound like an exhaust leak.... if your car sounds like its pinging.. you might be running way to lean and i would have that checked out... my car was pinging on the dyno and then later i had an exhaust leak the 2 sounded nothing a like....
and exhaust leak sounds like paper flapping in the wind.. pinging.. i cant really explain what that sounds like...

They do sound alike. Or atleast mine does.My exhaust leak sounds almost 100% identical pinging. I've had pinging from to much fuel, and knock from too little fuel/too much timing. When my car was pinging, it sounded EXACTLY like marbles being rolled around in a tin can. And my exhaust leak sounds A LOT like that. Maybe your leak is in a different location, or does just sounds different all together??... But my exhaust leak sounds a lot like pinging.

04-14-2007, 07:24 PM

#15

JimboGT01

3rd Gear Member

Thread Starter

Join Date: Jun 2006

Location: Houston

Posts: 683

RE: exhaust leak or engine knock

okay my and a friend have completely decided that the sound is not an exhaust leak,......now what else could it be? could it possiblly be a bad coil? the sound is coming from the inside of the engine.....