startup knock

Reply Subscribe

Thread Tools

Search this Thread

Mar 2, 2008 | 02:04 AM

'86_150

Thread Starter

Junior User

Joined: Jan 2007

Posts: 99

Likes: 0

From: Rochester Wa

startup knock

ok just yesterday my truck developed a knock. it only happens at startup for about 5 seconds then stops what could that be? thanks

Mar 2, 2008 | 04:55 AM

ozstang65

Senior User

Joined: May 2007

Posts: 274

Likes: 0

Hydraulic lifter before it pumps up

Mar 2, 2008 | 06:04 AM

srercrcr

Postmaster

Joined: May 2004

Posts: 2,854

Likes: 0

I wouldn't characterize lifters as a knock, more of a loud clicking.
A knock could be engine bearings or perhaps piston pin. Try a lighter weight of oil, it should increase the flow a little, a needy bearing might appreciate it.

Mar 2, 2008 | 01:08 PM

'86_150

Thread Starter

Junior User

Joined: Jan 2007

Posts: 99

Likes: 0

From: Rochester Wa

im running 10-40 so do think 5-30 would work?

Mar 2, 2008 | 01:43 PM

mhg

Fleet Mechanic

Joined: Sep 2003

Posts: 1,279

Likes: 1

From: savannah,ga

what kind of oil filter are you using
frams are known for this

Mar 2, 2008 | 04:41 PM

srercrcr

Postmaster

Joined: May 2004

Posts: 2,854

Likes: 0

5 30 would be fine, especially at your latitude.

Mar 2, 2008 | 04:45 PM

Franklin2

Moderator

Joined: Jan 2001

Posts: 56,997

Likes: 2,744

From: Virginia

Quote:

Originally Posted by mhg

what kind of oil filter are you using
frams are known for this

I would also change the oil filter. The anti-drain back valve inside may be leaking.

This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level

Verdad Gallardo

Top 10 Fords at 2026 Carlisle Ford Nationals

Joe Kucinski

3 Best / 3 Worst Parts of Modern Ford Ownership

Brett Foote

10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches

Pouria Savadkouei

Every 2026 Ford Engine Explained

Brett Foote

10 Ugly Ford Trucks That We Still Kinda Love

Joe Kucinski

10 Things Every Truck Owner NEEDS (2026 Edition)

Michael S. Palmer

Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath

Verdad Gallardo

Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer

Joe Kucinski

2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)

Brett Foote

Mar 3, 2008 | 07:30 AM

F3Beam

Senior User

Joined: Jul 2004

Posts: 191

Likes: 0

I had a "Knock" on startup with my F100 one time. I do think it lasted a little more than 5 seconds though, increasing the rev increased the speed of the knock, and then it would go away. It was the main bearings.

Mar 3, 2008 | 08:42 AM

#10

ri_truck_guy

Posting Guru

Joined: Jun 2002

Posts: 2,091

Likes: 3

From: Suffolk, VA USA

I had a similar problem with one of my old 300s. I kep the same weight oil, but switched to a synthetic blend. The knock went away and never came back.