No check engine codes
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Junior User
Joined: Jul 2005
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From: moonshine va
No check engine codes
Cleaned egr sensor and idle air sensor and still truck is stumbling say after i slow down or stop and start to accerate it will stumble not back fire.
I have a fuel tank issue that going to be fixed soon back tank has a hole in top ( going to replace tank and sending unit with pump and strainer ), front tank pump is bad going to replace that one when i pull the bed too .New fuel filter is on now and going to replace again when i replace tanks and all
Now what would cause engine or trans to stumble is the problem i cant figure out plus fuel mileage suckkkkkkkkkks big time and no check engine light ?
1988 f150
302 efi aod trans 4x4
133,000 miles
I have a fuel tank issue that going to be fixed soon back tank has a hole in top ( going to replace tank and sending unit with pump and strainer ), front tank pump is bad going to replace that one when i pull the bed too .New fuel filter is on now and going to replace again when i replace tanks and all
Now what would cause engine or trans to stumble is the problem i cant figure out plus fuel mileage suckkkkkkkkkks big time and no check engine light ?
1988 f150
302 efi aod trans 4x4
133,000 miles
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
Vacuum leaks are the common cause of an off idle stumble, and on an old truck the prime suspct is the juice can(vacuum resovoir) on the passenger inner fender. I suggest you take it off and inspect the bottom.. it often rusts out there, and if it does have holes in it replace with a plastic resovoir from a newer truck. The next big culprit are the vacuum lines themselves, it should be obvious if they are broken but sometimes they split too, and last of all is the brake booster, sometimes they leak but not in a way that affects the brakes... just the vacuum signal.
i ain't rite
Joined: Mar 2005
Posts: 65,422
Likes: 5,506
From: Marlboro Mental Hospital.
another common problem is if someone put those fancy platinum spark plugs in the engine.
these engines will not run on them.
just because they cost more does not mean they are better.
you need good old cheap motorcraft or autolite copper core spark plugs.
these engines will not run on them.
just because they cost more does not mean they are better.
you need good old cheap motorcraft or autolite copper core spark plugs.
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Junior User
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From: moonshine va
Ive got the cheap autolite coppercore thanks
Thread Starter
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Junior User
Joined: Jul 2005
Posts: 58
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From: moonshine va
Vacuum leaks are the common cause of an off idle stumble, and on an old truck the prime suspct is the juice can(vacuum resovoir) on the passenger inner fender. I suggest you take it off and inspect the bottom.. it often rusts out there, and if it does have holes in it replace with a plastic resovoir from a newer truck. The next big culprit are the vacuum lines themselves, it should be obvious if they are broken but sometimes they split too, and last of all is the brake booster, sometimes they leak but not in a way that affects the brakes... just the vacuum signal.
Thread Starter
|
Junior User
Joined: Jul 2005
Posts: 58
Likes: 0
From: moonshine va
Vacuum leaks are the common cause of an off idle stumble, and on an old truck the prime suspct is the juice can(vacuum resovoir) on the passenger inner fender. I suggest you take it off and inspect the bottom.. it often rusts out there, and if it does have holes in it replace with a plastic resovoir from a newer truck. The next big culprit are the vacuum lines themselves, it should be obvious if they are broken but sometimes they split too, and last of all is the brake booster, sometimes they leak but not in a way that affects the brakes... just the vacuum signal.
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