hammer
Bronco Guru
- Joined
- Nov 13, 2006
- Messages
- 1,359
Hey guys,
Ford maf efi 5.0l. Explorer block, mustang heads and intakes.
Been having an issue of bogging under load. I needed a new coil last August due to weak spark. During that time I screwed around with the distributer. Reset the timing to 10 btdc. Went for a drive, bogging under load. Try 12 degrees. Same thing. Try 14 degrees. Worse. Put it back to 10.
I chalked it up to it being really hot out and my intake pulls air from the engine compartment. Just on a whim I decide to try higher octane fuel, see what happens. Bronco runs much better. Still not gonna a win a drag race but it's driveable again. So I run 91 the rest of summer.
Go to fill up for the first time this fall and put 89 in it. Figured the hot outside temp won't be a factor anymore. Bronco falls on its face. Bogging worse than ever all through 3rd and 4th. On my way home I squeeze 1/3rd of a tank of 91 in and buy a bottle of octane booster. Truck runs mint.
Engine compression is 150 on all holes. Fuel pressure is good at the rail.
Where's my problem?
Ford maf efi 5.0l. Explorer block, mustang heads and intakes.
Been having an issue of bogging under load. I needed a new coil last August due to weak spark. During that time I screwed around with the distributer. Reset the timing to 10 btdc. Went for a drive, bogging under load. Try 12 degrees. Same thing. Try 14 degrees. Worse. Put it back to 10.
I chalked it up to it being really hot out and my intake pulls air from the engine compartment. Just on a whim I decide to try higher octane fuel, see what happens. Bronco runs much better. Still not gonna a win a drag race but it's driveable again. So I run 91 the rest of summer.
Go to fill up for the first time this fall and put 89 in it. Figured the hot outside temp won't be a factor anymore. Bronco falls on its face. Bogging worse than ever all through 3rd and 4th. On my way home I squeeze 1/3rd of a tank of 91 in and buy a bottle of octane booster. Truck runs mint.
Engine compression is 150 on all holes. Fuel pressure is good at the rail.
Where's my problem?