- Sep 2, 2012
- 468
Searching threads has not helped, partly because people's descriptions of the same problem varies, and partly because none seem to be similar to mine. I'm also getting more and more pressured for time as Fall progresses to winter, but my maintenance/repair list seems to keep growing (P0128 hit me again tonite, ECT and T-stat gotta be done, driveline/brake/coolant/power steering fluids on the list, stepper motors arrived yesterday). {off topic but related to time pressure, I just bought myself a new Nikon D7000 and I have two weeks to excercise it and decide whether to keep or return it. And I'm still working 6 nights a week...Sunday is gonna be busy!}
So I gotta throw a pile of symptoms out there and hope for some feedback that points me in the right direction(s) with the right priorities, just be aware that I believe I have 2 or more issues, so these observations may or not be related to each other.
First, several weeks back I did a couple 0-90mph video runs to post in another thread. At the end of the run, I heard a low speed squeak from the rear up to about 10mph. Truck was in 2Hi, squeaky noise was proportional to tire rotational speed. Application of the e-brake altered and or eliminated the noise depending on pressure applied. Application of the brake pedal did not seem to have the same effect. This same noise occurs rarely under most circumstances, yet very consistently appears as I drive up a slight ramp into the parking lot where I work. I would say that it happens at that spot 30% of the times (may be more, sometimes windows are closed or stereo is cranked). I do have this recorded, will post video later.
At the time of first occurrence I mentally chalked it up as a pad/rotor/ebrake isssue to be looked into further when I could replicate the problem more consistently.
Second, in the 9000km I have driven this truck since July, I have noticed possibly a dozen occurrences of a mild clunking when I transition from a state of coasting/deceleration, to some mid range acceleration (eg approaching a light which then turns green). Some thread searching seemed to turn up a few descriptions of gear lash issues, and thrust bearing something or other that I can't recall ATM, however it didn't really fit my perceptions closely, and my own gut was leading me to think u-joints.
Third, about 2 weeks ago, while cruising on the highway at 94kmh (always the speed I drive in 80km/h limit zones). I noticed a slight intermittent vibration creeping up through the floor pan under my feet. Could be felt through accelerator pedal but not through steering wheel. It was newly paved road, and I recall thinking/feeling like my front left tire had hit a short sticky patch of tar or something. Ever so much the slightest feel of resistance. For a mental image imagine driving with only your left front tire hitting the rumble strips on the side of some roads, except much smaller than normal. I tried to pay attention to what happened as I varied my speed +/- 10km/h from there. Seemed not to make a difference. Winds were gusting from right to left, and I thought I was picking up a pattern where if the gust came stronger I would feel this vibration. Trip ended, couldn't conclude anything, but had thoughts of a possible loose heat shield or backing plate catching wind and vibrating, but decided that can't account for the very mild feeling of resistance from the front left. Started thinking wheel bearing, but until the last few days, I had no other evidence supporting that.
Then a few days ago, some stupid kid rode his bike right in front of me and I had to brake heavily. At some slow speed just before full stop (say 10mph and less) I heard and felt grinding that was similar to what I'd had with a bad bearing on my Toronado many years ago. Gut feel again was front left. I was able to replicate that once or twice in the parking lot, but not since. It also had a similar feel to what completely worn out pads feel like when grinding on the rotor, but without the accompanying noise or brake pedal feedback. Front rotors and pads had been done by selling dealer just before my purchase, and although I haven't closely inspected the pads, it's clear from a distance that the rotors are not gouged/marked etc.
As a last comment on this vibe thru floorpan issue, I have done a lot more highway driving lately, and I feel like I'm noticing it pretty consistently at most normal highway speeds, but during a recent 160 km return trip out of town, I was clipping along anywhere between 120 and 140 and didn't seem to pick it up...
And finally, during the last few days I began to notice what I would describe as singing from my rotors under light brake pedal application at low speed. Same sound as running a finger along the rim of a crystal glass, definitely differently pitched from normal cheapo brake pad squeal.
So there ya go. I'm chasing my tail in circles trying to figure out some of these things
, have little time to get bogged down exhaustively searching threads and want to get this stuff dealt with before winter.
Throw out your thoughts/experience/WAGS
Thx
So I gotta throw a pile of symptoms out there and hope for some feedback that points me in the right direction(s) with the right priorities, just be aware that I believe I have 2 or more issues, so these observations may or not be related to each other.
First, several weeks back I did a couple 0-90mph video runs to post in another thread. At the end of the run, I heard a low speed squeak from the rear up to about 10mph. Truck was in 2Hi, squeaky noise was proportional to tire rotational speed. Application of the e-brake altered and or eliminated the noise depending on pressure applied. Application of the brake pedal did not seem to have the same effect. This same noise occurs rarely under most circumstances, yet very consistently appears as I drive up a slight ramp into the parking lot where I work. I would say that it happens at that spot 30% of the times (may be more, sometimes windows are closed or stereo is cranked). I do have this recorded, will post video later.
At the time of first occurrence I mentally chalked it up as a pad/rotor/ebrake isssue to be looked into further when I could replicate the problem more consistently.
Second, in the 9000km I have driven this truck since July, I have noticed possibly a dozen occurrences of a mild clunking when I transition from a state of coasting/deceleration, to some mid range acceleration (eg approaching a light which then turns green). Some thread searching seemed to turn up a few descriptions of gear lash issues, and thrust bearing something or other that I can't recall ATM, however it didn't really fit my perceptions closely, and my own gut was leading me to think u-joints.
Third, about 2 weeks ago, while cruising on the highway at 94kmh (always the speed I drive in 80km/h limit zones). I noticed a slight intermittent vibration creeping up through the floor pan under my feet. Could be felt through accelerator pedal but not through steering wheel. It was newly paved road, and I recall thinking/feeling like my front left tire had hit a short sticky patch of tar or something. Ever so much the slightest feel of resistance. For a mental image imagine driving with only your left front tire hitting the rumble strips on the side of some roads, except much smaller than normal. I tried to pay attention to what happened as I varied my speed +/- 10km/h from there. Seemed not to make a difference. Winds were gusting from right to left, and I thought I was picking up a pattern where if the gust came stronger I would feel this vibration. Trip ended, couldn't conclude anything, but had thoughts of a possible loose heat shield or backing plate catching wind and vibrating, but decided that can't account for the very mild feeling of resistance from the front left. Started thinking wheel bearing, but until the last few days, I had no other evidence supporting that.
Then a few days ago, some stupid kid rode his bike right in front of me and I had to brake heavily. At some slow speed just before full stop (say 10mph and less) I heard and felt grinding that was similar to what I'd had with a bad bearing on my Toronado many years ago. Gut feel again was front left. I was able to replicate that once or twice in the parking lot, but not since. It also had a similar feel to what completely worn out pads feel like when grinding on the rotor, but without the accompanying noise or brake pedal feedback. Front rotors and pads had been done by selling dealer just before my purchase, and although I haven't closely inspected the pads, it's clear from a distance that the rotors are not gouged/marked etc.
As a last comment on this vibe thru floorpan issue, I have done a lot more highway driving lately, and I feel like I'm noticing it pretty consistently at most normal highway speeds, but during a recent 160 km return trip out of town, I was clipping along anywhere between 120 and 140 and didn't seem to pick it up...
And finally, during the last few days I began to notice what I would describe as singing from my rotors under light brake pedal application at low speed. Same sound as running a finger along the rim of a crystal glass, definitely differently pitched from normal cheapo brake pad squeal.
So there ya go. I'm chasing my tail in circles trying to figure out some of these things
, have little time to get bogged down exhaustively searching threads and want to get this stuff dealt with before winter.Throw out your thoughts/experience/WAGS
Thx
