Predetonation
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Junior User
Joined: Jun 1999
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From: Tempe USA
Predetonation
I just recently moved to southern Missouri from South Dakota and my 86 F-150 with a 351 HO with 68K miles started pinging when I am going up a hill. Never had this problem in the black hills of south dakota but these hills around here are causing alot of pinging. Other than the pinging the truck runs great. Any sugestions would be greatly appriciated.
Senior User
Joined: Jun 1999
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From: saramento usa
Predetonation
Where in MO did you move? I grew up in Eastern South Dakota, lived in the Black Hills for a number of years and lived in Southern MO for a couple (West Plains). Two things to try on the pinging, one: use a higher octane gas; It seems to me that different regions have different quality gas or at least the additive that they put in the gas or two: advance (? I think that's the correct word) your timing; You're probably running around 12 degrees BTDC and you may need to advance to 10 or even 8 degrees. I think the humidity must also play a big roll in determining your driving power. I put in an adjustable timing module from MSD so I can adjust my timing from the cab between 4-24 degrees BTDC.
Slik
Slik
Senior User
Joined: Jun 1999
Posts: 361
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Predetonation
Slik,
Going from 12 degress to 10 or 8 degrees would actualy be retarding the timing,but you have the right idea.the timing should be retarded in 2 degree increments until the pinging stops.It should be adressed quickly as pre detonation is very bad for an engine.
Jeff
Going from 12 degress to 10 or 8 degrees would actualy be retarding the timing,but you have the right idea.the timing should be retarded in 2 degree increments until the pinging stops.It should be adressed quickly as pre detonation is very bad for an engine.
Jeff
Mountain Pass
Joined: Aug 1999
Posts: 139
Likes: 12
From: Chicagoland
Predetonation
A non fuctioning EGR can cause part throttle pinging. The EGR dilutes the air fuel charge with exhaust gas. This lowers combustion temperature to control oxides of nitrogen and lessen the chance of pinging. Even if this is your problem, it may be easier to stop by retarding timing or buying higher octane fuel.
Senior User
Joined: Jun 1999
Posts: 366
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From: saramento usa
Predetonation
Yeah, I always get them mixed up. It's tough working on my engine when I don't know what I'm talking about!!
Slik
Slik
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Senior User
Joined: Jun 1999
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From: saramento usa
Predetonation
DG,
Congratulations, I used to live in Rapid. It's the most beautiful area I've ever lived, but I can't seem to ever make any money there.... Hey, the Black Hills area is fairly dry, not arid, but certainly less humid than the rest of the state, and your running at several thousand feet. If you're into the Hills at all, you'll be running a mile high most of the time. I believe you would want to run at 12-15 BTDC under those conditions. And (I still have relatives back there) maybe I'll see you next summer when I visit.
Slik
Congratulations, I used to live in Rapid. It's the most beautiful area I've ever lived, but I can't seem to ever make any money there.... Hey, the Black Hills area is fairly dry, not arid, but certainly less humid than the rest of the state, and your running at several thousand feet. If you're into the Hills at all, you'll be running a mile high most of the time. I believe you would want to run at 12-15 BTDC under those conditions. And (I still have relatives back there) maybe I'll see you next summer when I visit.
Slik
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