spark knock
Thread Starter
|
Senior User
Joined: Apr 2004
Posts: 106
Likes: 0
spark knock
Got a 94 f-150 with an inline 6 4.9. Yesterday I had 8 bags of 50lbs in the back. I noticed got a lil spark knock when it was in third and I tried to make it shift up. This motor is a replacement motor as my last one did the same thing. The only difference is my old motor was doing it really really bad. IT had a cracked head. I noticed this knocking in this motor only after getting the grain. I also filled up the tank the other day, could it just be a bad batch of gas? It still knocks faintly when warmed up even without towing or weight in the back. It only knocks when its really low rpms in third and when I give it gas. I dont have a cracked head or gasket and I have run fuel injector cleaner in the tank. help please!!
Senior User
Joined: Dec 2003
Posts: 354
Likes: 1
From: Memphis, TN USA
Try higher grade fuel.
When was the last time the coolant has been flushed? Radiator cap replaced? Make sure the radiator fan clutch is still good and radiator fan shroud is still in place. If the vehicle is missing the radiator fan shroud, the air flow direction to the radiator will loose as much as 50%.
Too much engine heat (due to more load) would cause it spark knock.
This knock you are hearing, could be it related to low oil pressure?
When was the last time the coolant has been flushed? Radiator cap replaced? Make sure the radiator fan clutch is still good and radiator fan shroud is still in place. If the vehicle is missing the radiator fan shroud, the air flow direction to the radiator will loose as much as 50%.
Too much engine heat (due to more load) would cause it spark knock.
This knock you are hearing, could be it related to low oil pressure?
Thread
Thread Starter
Forum
Replies
Last Post
89F20plowtruck
1987 - 1996 F150 & Larger F-Series Trucks
10
Apr 20, 2012 08:17 AM
CSchob
1999 - 2003 7.3L Power Stroke Diesel
12
Dec 2, 2011 12:54 PM
