4x4 problems
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4x4 problems
hello dere!
I've been having an issue that started a few days after I installed new coil packs in my truck. I have a mostly stock 07 xlt supercab, 4wd, 4.7L.
1)At speeds upwards of 65-70 with the accelerator in the sweet spot between acceleration and compression, the 4-low would start to flash, quickly and without rhythm. I would experience a slight and momentary power loss, and the speedometer needle(but not the tach) would gyrate wildly from 15mph-just below current speed. If I dropped below 65mph the problem would mostly abate.
2)With the trans engaged in reverse, upon applying a small bit of gas pedal, 4-low light flashes quickly without rhythm, also experiencing some power loss that abates with gas pedal pushed considerably. (I regularly have to back up my gravel driveway, and can't idle backwards and up like I used to. There are now burnout spots I'll have to get the grader out to fix because of this. Will wait till the problem is solved before I bother fixing the driveway.)
Problem 1 has steadily gotten worse, and has started to happen at any speed, unexpectedly, and can last for a 1/4 mile or so before abating. Also, have noticed, with window down, a quick metal on metal sound that occaisionally, not always, accompanies the issue. The problem has also now started to happen while under acceleration and compression, not just when coasting.
A couple suggestions were suggested by various people who have some mechanical aptitude.
-my mechanic says there are no vacuum issues, and that he doesn't know what's wrong, and to take it to a 4x4 specialist
-another guy said to replace the sensor on the trans or the transfer case. i have tried both.
Not sure which way to move now. I need to be able to use my truck, but can't afford 8 hours of fiddling at $120/hour at a 4x4 shop right now. My mechanic will tell me when he can't fix something and not charge me, whereas I don't know the 4wd shop guys and expect a full ticket from their work.
I had an 01 with a 5.4L before this that was damn near bulletproof, got better gas mileage, and would pull anything I hitched to it. This new thing is a gutless gas hog so far. Been kicking myself ever since trading my old truck for it. It is a damn good lookin truck, though.
So, anyone got a clue on this? Sure would appreciate some direction.
I've been having an issue that started a few days after I installed new coil packs in my truck. I have a mostly stock 07 xlt supercab, 4wd, 4.7L.
1)At speeds upwards of 65-70 with the accelerator in the sweet spot between acceleration and compression, the 4-low would start to flash, quickly and without rhythm. I would experience a slight and momentary power loss, and the speedometer needle(but not the tach) would gyrate wildly from 15mph-just below current speed. If I dropped below 65mph the problem would mostly abate.
2)With the trans engaged in reverse, upon applying a small bit of gas pedal, 4-low light flashes quickly without rhythm, also experiencing some power loss that abates with gas pedal pushed considerably. (I regularly have to back up my gravel driveway, and can't idle backwards and up like I used to. There are now burnout spots I'll have to get the grader out to fix because of this. Will wait till the problem is solved before I bother fixing the driveway.)
Problem 1 has steadily gotten worse, and has started to happen at any speed, unexpectedly, and can last for a 1/4 mile or so before abating. Also, have noticed, with window down, a quick metal on metal sound that occaisionally, not always, accompanies the issue. The problem has also now started to happen while under acceleration and compression, not just when coasting.
A couple suggestions were suggested by various people who have some mechanical aptitude.
-my mechanic says there are no vacuum issues, and that he doesn't know what's wrong, and to take it to a 4x4 specialist
-another guy said to replace the sensor on the trans or the transfer case. i have tried both.
Not sure which way to move now. I need to be able to use my truck, but can't afford 8 hours of fiddling at $120/hour at a 4x4 shop right now. My mechanic will tell me when he can't fix something and not charge me, whereas I don't know the 4wd shop guys and expect a full ticket from their work.
I had an 01 with a 5.4L before this that was damn near bulletproof, got better gas mileage, and would pull anything I hitched to it. This new thing is a gutless gas hog so far. Been kicking myself ever since trading my old truck for it. It is a damn good lookin truck, though.
So, anyone got a clue on this? Sure would appreciate some direction.
Fleet Mechanic
Joined: Jul 2010
Posts: 1,354
Likes: 31
From: Winnipeg
It may be something you've disturbed when changing your coils. Go back and look at the areas where you worked looking for loose, broken connectors, parts you removed for access. Check all your vacuum lines for irregular bends, possible cracked elbows where they plug into actuators, sensors or switches. Concentrate near right firewall. Lots of connections there.
Thread Starter
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New User
Joined: Jul 2020
Posts: 3
Likes: 0
It may be something you've disturbed when changing your coils. Go back and look at the areas where you worked looking for loose, broken connectors, parts you removed for access. Check all your vacuum lines for irregular bends, possible cracked elbows where they plug into actuators, sensors or switches. Concentrate near right firewall. Lots of connections there.
Good answers here. The only answers ive gotten so far on the f150 forum were pretty much either antagonistic or "replace random expensive parts".
Technician: "The computer says to replace this thingymajiggawomble."
Mechanic: "Tap that with a wrench and see if it starts working.
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PlatinumPete
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