Knocking 302

Reply Subscribe

Thread Tools

Search this Thread

Nov 8, 2006 | 05:30 AM

mrl390

Thread Starter

Elder User

Joined: Mar 2006

Posts: 590

Likes: 1

From: Venetia, PA

Knocking 302

I have a 1993 F150 with a 302 that has a knock. It doesnt sound like a thrown rod because it doesnt get louder when I accelerate. The knock is always there whether its cold or warm. Does anyone know what this could be?

Nov 8, 2006 | 09:43 AM

Kemicalburns

Hotshot

Joined: Jul 2002

Posts: 14,285

Likes: 12

From: Bend,OR

whats your oil pressure at? how many miles on the motor. have you changed to a different oil recently? are you using a fram oil filter?

Nov 8, 2006 | 11:18 AM

crash12884

Junior User

Joined: Jan 2005

Posts: 61

Likes: 0

an easy way to stop the knock lol .... bardhol oil addant ... i had an engine going out and added it to it and it reduced the blowby and got rid of my knock but if its something major thats a diff story

Nov 8, 2006 | 02:31 PM

Sport45

Cargo Master

Joined: Apr 2003

Posts: 2,059

Likes: 426

From: Too close to Houston

Put a timing light on it and see if your harmonic balancer has slipped. A bad HB can give a knock like you describe.

Nov 8, 2006 | 03:04 PM

Kemicalburns

Hotshot

Joined: Jul 2002

Posts: 14,285

Likes: 12

From: Bend,OR

so can a cracked manifold but we need more info from this guy

Nov 8, 2006 | 05:24 PM

mrl390

Thread Starter

Elder User

Joined: Mar 2006

Posts: 590

Likes: 1

From: Venetia, PA

Sorry I didnt leave more info but I typed up a long explanation and it didnt post so I got fed up and posted a shorter one. So here's the deal. Like i said its a 302. It has 161,000 miles on it. I changed the oil about 2000 miles ago and used 10w-30 and a fram oil filter. Oil pressure is fine, right in the middle of the gauge. If you mean a cracked intake manifold then I know for a fact that the manifold is fine because I had it off recently and both upper and lower look fine. And yes it did knock before I removed the manifold. Any more help would be appriciated. Thanks

Nov 9, 2006 | 09:58 AM

Kemicalburns

Hotshot

Joined: Jul 2002

Posts: 14,285

Likes: 12

From: Bend,OR

no i meant exhaust manifold, these are prone to cracking. remove the fram filter and put anything else on Purolator,wix, motorcraft to name a few. Fram is known for this very issue. and dont trust the stock gauge, its nothing more then an idiot light that moves, install a mechanical oil pressure gauge and tell us what you really are running.