351M pinging like crazy!
Posting Guru
Joined: Aug 2000
Posts: 2,416
Likes: 4
From: PacNW
351M pinging like crazy!
>I have a 79 F-150 with
>a 351M with an Edelbrock
>intake and 4 barrell.
>When she gets hot she
>pings like crazy. Anyone
>have this problem with this
>engine? Thanks
First thing I'd check is the timing. Second thing is to make sure the EGR system is functioning properly if it's still there. These engines were designed to function with EGR so taking it off can have a detrimental effect on the performance. You may have to retard the timing more and/or go to a higher octane fuel if you've pulled the EGR off.
>a 351M with an Edelbrock
>intake and 4 barrell.
>When she gets hot she
>pings like crazy. Anyone
>have this problem with this
>engine? Thanks
First thing I'd check is the timing. Second thing is to make sure the EGR system is functioning properly if it's still there. These engines were designed to function with EGR so taking it off can have a detrimental effect on the performance. You may have to retard the timing more and/or go to a higher octane fuel if you've pulled the EGR off.
Thread Starter
|
Posting Guru
Joined: Aug 2000
Posts: 1,127
Likes: 3
From: (near) Denver USA
351M pinging like crazy!
>make sure the EGR system
>is functioning properly if it's
>still there. These engines were
>designed to function with EGR
>so taking it off can
>have a detrimental effect on
>the performance. You may have
>to retard the timing more
>and/or go to a higher
>octane fuel if you've pulled
>the EGR off.
Or enrich the A/F mixture to compensate for the missing EGR. The purpose of EGR is to reduce NOx emissions produced by over-lean mixtures.
Check the base timing and also the vacuum advance. Ford vac advances are adjustable with a 1/8" Allen wrench in the vacuum nipple. To reduce vac advance sensitivity, turn the screw counter-clockwise. (Some aftermarket vac advances work the opposite way, though.)
BubbaF250
1980 F250 4x4 Custom, 351M/NP435/NP208/D44HD-TTB/D60-FF/3.55s 6750 GVW, Rust & White.
>is functioning properly if it's
>still there. These engines were
>designed to function with EGR
>so taking it off can
>have a detrimental effect on
>the performance. You may have
>to retard the timing more
>and/or go to a higher
>octane fuel if you've pulled
>the EGR off.
Or enrich the A/F mixture to compensate for the missing EGR. The purpose of EGR is to reduce NOx emissions produced by over-lean mixtures.
Check the base timing and also the vacuum advance. Ford vac advances are adjustable with a 1/8" Allen wrench in the vacuum nipple. To reduce vac advance sensitivity, turn the screw counter-clockwise. (Some aftermarket vac advances work the opposite way, though.)
BubbaF250
1980 F250 4x4 Custom, 351M/NP435/NP208/D44HD-TTB/D60-FF/3.55s 6750 GVW, Rust & White.
Posting Guru
Joined: Aug 2000
Posts: 2,416
Likes: 4
From: PacNW
351M pinging like crazy!
>Or enrich the A/F mixture to
>compensate for the missing EGR.
>The purpose of EGR is
>to reduce NOx emissions produced
>by over-lean mixtures.
Yep no question a lean mixture will cause a hot engine and increase the tendency to detonate.
>compensate for the missing EGR.
>The purpose of EGR is
>to reduce NOx emissions produced
>by over-lean mixtures.
Yep no question a lean mixture will cause a hot engine and increase the tendency to detonate.
Senior User
Joined: Aug 2000
Posts: 264
Likes: 0
351M pinging like crazy!
thanks all, I'll start with checking the timing. I'm not sure if the Edelbrock intake and carb retained the EGR, I'm thinking not.
Trending Topics
Post Fiend
Joined: Feb 2000
Posts: 11,496
Likes: 6
From: Kansas
351M pinging like crazy!
[font size="1" color="#FF0000"]LAST EDITED ON 27-Feb-01 AT 11:35 PM (EST)[/font][p]I had a 400 C that was bored out and did the same thing. Especially when the outside temp rose. Installed some splitfire plugs. Eliminated 99.9% of the problem. Only when it was 100+ outside, then I needed to run premium fuel. I messed with timing and had no effect. Nothing worked until the plugs were installed.
I did keep mine all stock except for the oversize pistons on a 2 barrel carb.
That's my experience with it.
98 F250LD 4X4
I did keep mine all stock except for the oversize pistons on a 2 barrel carb.
That's my experience with it.
98 F250LD 4X4
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 10 Fords at 2026 Carlisle Ford Nationals
Joe Kucinski
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Thread
Thread Starter
Forum
Replies
Last Post
