Loud knocking at start up, goes away and starts again at higher rpm

Reply Subscribe

Thread Tools

Search this Thread

01-12-2020, 05:26 AM

22marv

Registered User

Thread Starter

Join Date: Feb 2019

Location: The Mountains

Posts: 15

Likes: 2

Received 0 Likes on 0 Posts

Loud knocking at start up, goes away and starts again at higher rpm

My truck is knocking very badly at start up. After I give it a couple revs it’s mostly goes away, but returns at astound 2400 rpm. I played with the distributed and a timing light and it’s gets close to 5 btdc but with the distributer all the way retarded. Is the engine not timed correctly?

Reply Like

01-12-2020, 05:56 AM

SheepishLion89

Registered User

Join Date: Aug 2018

Posts: 116

Likes: 9

Received 15 Likes on 10 Posts

Have you checked if revs/timing adjusts when setting the debug/timing jumper wire? If there is no change, I would see if TPS is properly adjusted.

Reply Like

01-12-2020, 06:04 AM

22marv

Registered User

Thread Starter

Join Date: Feb 2019

Location: The Mountains

Posts: 15

Likes: 2

Received 0 Likes on 0 Posts

When I jump the wire I don’t get a drop in revs, but, I do get a check engine light. I will move on to the tps. Would the tps cause the knocking or just the timing issue?

Reply Like