intermittent problem with 300
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Joined: Feb 2000
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intermittent problem with 300
I have an ’86 F-150 with a 300-6. It has a sort of on-off problem. Some days, it will run perfect – very smooth and lots of power. Other days it doesn’t feel near as smooth or powerful and is a lot louder when accelerating. There are no definite conditions I have found that will make it act up. I only have about 9000 miles on both the engine and the carb. Any ideas on what could be wrong? Thanks,
Gary
1986 F-150 4x4 300 I6 4 sp.
Gary
1986 F-150 4x4 300 I6 4 sp.
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From: Linwood, N.J. USA!
intermittent problem with 300
gary_p
I had the same truck years ago. I only have some suggestions that may be the cause of your prob. It first sounds to me that your cat-converter is starting to break up internally thus partially blocking the exhaust flow. Sometimes the broken pieces will block off the back of the cat, and sometimes they will not. I had this happen on my 86' f-150 and also my 92' f-250.
Second possibility could be the large vacuum line that goes to the break booster. This line was resting on the intake manifold and after time wore a hole in the underside of the line. I never noticed this because of the way the line was resting on the manifold. I had this happen on my 86' f-150 and also another 86' f-150 w/ automatic trans. I am not positive if these suggestions will help but at least it is a start. Good luck.
Jakegypsum.
Ford fleet......soup to nuts.
When the wind is just right you can hear them
Chevys rust................just listen.
I had the same truck years ago. I only have some suggestions that may be the cause of your prob. It first sounds to me that your cat-converter is starting to break up internally thus partially blocking the exhaust flow. Sometimes the broken pieces will block off the back of the cat, and sometimes they will not. I had this happen on my 86' f-150 and also my 92' f-250.
Second possibility could be the large vacuum line that goes to the break booster. This line was resting on the intake manifold and after time wore a hole in the underside of the line. I never noticed this because of the way the line was resting on the manifold. I had this happen on my 86' f-150 and also another 86' f-150 w/ automatic trans. I am not positive if these suggestions will help but at least it is a start. Good luck.
Jakegypsum.
Ford fleet......soup to nuts.
When the wind is just right you can hear them
Chevys rust................just listen.
Freshman User
Joined: Feb 2000
Posts: 28
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intermittent problem with 300
Can't be the cat, took it off a few months ago :-). Actually, I first noticed this problem (mostly the noise) after I took it off (truck was truly gutless before).
I will check the vacuum line, thanks for the suggestions.
Gary
1986 F-150 4x4 300 I6 4 sp.
I will check the vacuum line, thanks for the suggestions.
Gary
1986 F-150 4x4 300 I6 4 sp.
