Pinging
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Pinging
I got to thinking about a pinging problem with my 300-6 in a 86 F250 4x4. (Question 1)Pinging is, in fact, spark knock, right? It sounds to me more like a quick, metallic rattling sound. I know that when I first installed the rebuilt motor it spark-knocked until I retarded the timing to about 4 degrees (motor is no-emissions). It runs great until I put the plow on. It doesn't ping (or spark knock) while plowing, but when I take it on the road, it spark knocks constantly regardless of speed or gear. I know the heavier load has something to do with it but (Question 2) what can I do?? I've hauled heavy loads (gravel, stone, etc) over 1000lbs or so with no knocking. One other thing: I had a problem with carb icing that, when iced-up, the choke would close and the motor would run rich (poorly) and when climbing a hill or at high speed, it would make the same noise as spark knocking (or pinging if its the same thing). (Question 3)And why is it called pinging, anyway? It doesn't even sound like a pinging sound. Humor me, please. Thank you.
Skippy
Skippy
Fleet Mechanic
Joined: Aug 2000
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From: Texas
Pinging
If it's pinging, what grade of fuel are you using. My father had the smae exact problem with his 82 F-150 with a 300. Until I finally convinced him to quit using the cheap stuff (3 years ago gas was still cheap compared to prices now.)
I think he was using the lowest octane rated gas he could find, I convinced him to go up one grade in gas and it quit. It ran better and quit pinging.
Hopefully this helps.
Kyle
[link:www.geocities.com/hotrodford_88/|Hotrodford_88's Webpage]
[link:www.geocities.com/westlake_vfd/Westlake.html|Westlake VFD Website]
I think he was using the lowest octane rated gas he could find, I convinced him to go up one grade in gas and it quit. It ran better and quit pinging.
Hopefully this helps.
Kyle
[link:www.geocities.com/hotrodford_88/|Hotrodford_88's Webpage]
[link:www.geocities.com/westlake_vfd/Westlake.html|Westlake VFD Website]
Thread Starter
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Pinging
I've been using regular low octane thinking that this new motor (4K) ought to be able to process the lower octane. An older high mileage motor might need the higher octane, right? I may have to use 92 octane if no other alternative exists. Thanks.
Skippy
Skippy
Fleet Mechanic
Joined: Aug 2000
Posts: 1,504
Likes: 1
From: Texas
Pinging
Try the midgrade gasoline, instead of the high octane stuff.
I run the high octane in mine, because I have alot of fire going through the plugs. I think my dad used 89 octane. I don't know what mid-grade is anymore, I know that high octane is 92.
[link:www.geocities.com/hotrodford_88/|Hotrodford_88's Webpage]
[link:www.geocities.com/westlake_vfd/Westlake.html|Westlake VFD Website]
I run the high octane in mine, because I have alot of fire going through the plugs. I think my dad used 89 octane. I don't know what mid-grade is anymore, I know that high octane is 92.
[link:www.geocities.com/hotrodford_88/|Hotrodford_88's Webpage]
[link:www.geocities.com/westlake_vfd/Westlake.html|Westlake VFD Website]
