New noise issue

Reply Subscribe

Thread Tools

Search this Thread

Apr 23, 2008 | 09:02 PM

reifwj

Thread Starter

Senior User

Joined: Mar 2008

Posts: 171

Likes: 0

From: Idaho

New noise issue

Ok, now when i hammer on it, i have a knock. It sounds like my chevy did when i shifted to soon. I will have to check the timing again. It seems a little sluggish. could i have the carb set to lean and be causing a spark knock because of not enough fuel. It's not constant, only at certain times during acceleration. Could the timing be off cause this. I finally got the dang valve train noise figured out, now it's onto the next issue. Help me please.

Apr 24, 2008 | 09:40 AM

Freightrain

Lead Driver

Joined: Jan 2003

Posts: 9,893

Likes: 12

From: Ohio

You mentioned a knock when you started it after getting oil problem solved. Same noise?

Could be a timing/knock issue, but could be more severe too.

Apr 24, 2008 | 10:13 AM

reifwj

Thread Starter

Senior User

Joined: Mar 2008

Posts: 171

Likes: 0

From: Idaho

No, it's not the same. The knock before is now gone. I'm guessing it just took some time to get oil to the entire engine. It's almost like a dead spot in the throttle and once i get through it, I don't hear it anymore.

Apr 24, 2008 | 12:32 PM

Freightrain

Lead Driver

Joined: Jan 2003

Posts: 9,893

Likes: 12

From: Ohio

Can you make it just rev'n the throttle? or does it have to be under load?

Apr 24, 2008 | 12:46 PM

reifwj

Thread Starter

Senior User

Joined: Mar 2008

Posts: 171

Likes: 0

From: Idaho

Has to have a load. It sounds like a manual tranny that was shifted to soon. My inexperience tells me either the kickdown is not engaging, or the motor is not getting enough fuel.

Apr 24, 2008 | 07:29 PM

reifwj

Thread Starter

Senior User

Joined: Mar 2008

Posts: 171

Likes: 0

From: Idaho

OK, it is knocking when i put it and drive and power brake it. It starts knocking just barely into the throttle. I can hear it a little bit. I'm going to check for bent push rods tonight. I'm going to put the original push rods back in. Any other ideas?

Apr 24, 2008 | 08:30 PM

Freightrain

Lead Driver

Joined: Jan 2003

Posts: 9,893

Likes: 12

From: Ohio

Strange that it's knocking so easily...that is leading me to believe it's more serious then a detonation issue(timing).
If you can narrow the noise down, you can pull a spark plug at each cylinder and see if knock goes away. This unloads the rod bearing(since it's not firing) and will usually eliminate the knock. This will pinpoint a more serious issue.

If it was pushrods...it would be lighter tick(like you heard before), not a knock.

Top 10 Ford Truck Tragedies

Joe Kucinski

AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make

Brett Foote

Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!

Michael S. Palmer

Ford's 2001 Explorer Sportsman Concept Looks For a New Home

Verdad Gallardo

10 Best Ford Truck Engines We Miss the Most!

Joe Kucinski

2026 Shelby F-150 Off-Road: Better Than a Raptor R?

Brett Foote

2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!

Michael S. Palmer

10 Most Surprising 2026 Ford Truck Features!

Joe Kucinski

Top 10 Ford Trucks Coming to Mecum Indy 2026

Brett Foote

5 Best / 5 Worst Ford Truck Wheels of All Time

Joe Kucinski

Apr 25, 2008 | 07:52 AM

Freightrain

Lead Driver

Joined: Jan 2003

Posts: 9,893

Likes: 12

From: Ohio

Advanced timing gives you knock, as it fires too soon-detonation. Retarded takes away power, making it lazy since it's firing so late in the cycle.

Apr 25, 2008 | 08:07 AM

#10

reifwj

Thread Starter

Senior User

Joined: Mar 2008

Posts: 171

Likes: 0

From: Idaho

I retarded the timing and most of it has gone away. I now feel safe to drive it to the base to use a timing light. It is possible the remainder is an exhaust leak. Have to work hard to hear it.