95 F150 Mystery Knock (with Video)
11-23-2013, 04:52 PM
#1
95 F150 Mystery Knock (with Video)
1995 F150
Straight Six
M5R2 5 Speed
4x4
For some time now my F150 has developed a mysterious knock. It really is only audible past half throttle (maybe closer to 1/3 thottle). It is most noticeable under load, for instance when climbing a hill, or directly after shifting. For instance right after shifting from 3rd to 4th it'll be very loud and then once you get up to cruising speed and let off the gas it'll quiet down.
I've noticed a pretty decent loss of power since it's started happening.
No check engine light. Tried Seafoaming, then new plugs and wires. No change.
Video One:
For this video I put my phone down by the shifter boot, so it picked up some other noise from the transmission. Try contrasting the sound to video 2.
Brief Summary of times when you can really hear the knock:
1:44 Slight Hill
2:20 Slight Hill in O/D
3:04 Hill in 3rd
3:18 Early Shift into 4th
4:07 Take Off
Video Two: You can barely hear it, if at all in this video.
Straight Six
M5R2 5 Speed
4x4
For some time now my F150 has developed a mysterious knock. It really is only audible past half throttle (maybe closer to 1/3 thottle). It is most noticeable under load, for instance when climbing a hill, or directly after shifting. For instance right after shifting from 3rd to 4th it'll be very loud and then once you get up to cruising speed and let off the gas it'll quiet down.
I've noticed a pretty decent loss of power since it's started happening.
No check engine light. Tried Seafoaming, then new plugs and wires. No change.
Video One:
For this video I put my phone down by the shifter boot, so it picked up some other noise from the transmission. Try contrasting the sound to video 2.
Brief Summary of times when you can really hear the knock:
1:44 Slight Hill
2:20 Slight Hill in O/D
3:04 Hill in 3rd
3:18 Early Shift into 4th
4:07 Take Off
Video Two: You can barely hear it, if at all in this video.
Last edited by 412aaron; 11-23-2013 at 05:17 PM.
11-23-2013, 05:31 PM
#4
member
Well you have to have a timing light to check the timing ! If u don't have one it be a good to take it some were to have it checked . You really can't hear much on the vedio you posted .
11-23-2013, 07:15 PM
#6
Yeah its kinda hard to hear the knock, but from what I heard it almost sounds like an exhaust leak. To me it was more a tick than a knock. Hence the reason why you hear it past half throttle because its pushing more air through the exhaust, making more leak out, hence the knock/tick.
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11-24-2013, 06:18 PM
#8
Seafoam was pulled into the intake via brake booster vacuum line, and then the rest I dumped in the gas. That was about a month or so ago. I waited a couple tanks of gas and then did the plugs. They were Motorcrafts gapped at .044, as per the sticker under the hood, which called for .042-.046.
11-24-2013, 06:21 PM
#9
Yeah its kinda hard to hear the knock, but from what I heard it almost sounds like an exhaust leak. To me it was more a tick than a knock. Hence the reason why you hear it past half throttle because its pushing more air through the exhaust, making more leak out, hence the knock/tick.
11-24-2013, 07:14 PM
#10
Yes that is what an exhaust leak will do. It does it then because your probably giving it more gas to accelerate. Unless its super bad, it will do it whenever you are on it, giving it gas.