murick
Well-Known Member
- Joined
- Jul 5, 2021
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- Location
- Prague, Czech Rep.
- First Name
- Richard
- Vehicle(s)
- 2021 Euro Mach 1
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- #1
I am looking for any comment or advice on my problem and/or my attempt to analyse it 
as I would explain below.
After passing the annual check at my Ford dealer, where they changed the engine oil and "adjusted" my shifter (more on that later), and then passing by another Ford shop for getting fixed the front right/passenger wheel fender liner, I noticed that my Mach 1 started to tick.
Just for the record I have an "Euro Mach 1" with Tremec, which comes with 1:3.55 LSD (i.e. not a Torsen as the US model), but apart from that, it is basically a non-HP US version, with all options included.
The first dealer was "adjusting" my shifter, because of my complain about a grinding noise in the 2nd gear (there is a thread in Mach 1 subforum on the topic, so it is not something unknown, but the definitive solution was not posted so far - apart from replacing the shifter with an aftermarket one - which I intend to do, but have not done yet). When I was asking what exactly they did to the shifter, the answer was that the technician "had adjusted it", which did not explain anything, but since I did not know at that time if the intervention helped at all, I let it be. Anyway, it is safe to assume he moved either the shifter mount, or might have touched even something else...
The guys fixing the fender liner should not come anywhere close to the drivetrain, they just remounted the engine bay deflector and redid the fender liner with pushpins.
So after those two repairs I noticed a new sound in the cabin. It only starts to appear when driving over 50-55 kph (would be 31-34 mph). I caught it first in the 4th gear, but then noticed it in the 3rd as well, and then realized it does not depend on the gear, but on the ground speed. I can hear it even when I put in neutral and/or push the clutch, so the engine is idling at 900 rpm. With a gear high enough to keep the engine quiet I can confirm it up to 70 kph (44 mph), after that I am not sure whether it fades out by itself, or just gets shadowed by the engine, or both. What is clear though is the lower limit. When driving slower I cannot hear that.
I tried to record it, but the recording turned out to be very subtle (it is much clearer in the real life) and difficult to use as a demonstration. However I was able to filter the recording to the point I could "measure" the frequency of the tick and it seems to be perfectly matching the rpms of the driveshaft (considering the ground speed and the diff ratio). The hypothesis that the problem is with the driveshaft also complements the other observations about being non dependent on the gears.
Now what I am wondering and hoping maybe someone might give some insights about is which part could fail to produce this behavior. I understand it should be related to the driveshaft, could be also the differential, but probably not the rear (or front) axle, since then the frequency of the tick will be different. The strange part is also how the manifestation depends on the speed the change from "not audible" to "clearly audible" is very well pronounced.
I am going to see my dealer ASAP, so any tips to what to ask them or tell them are also appreciated.
as I would explain below.After passing the annual check at my Ford dealer, where they changed the engine oil and "adjusted" my shifter (more on that later), and then passing by another Ford shop for getting fixed the front right/passenger wheel fender liner, I noticed that my Mach 1 started to tick.
Just for the record I have an "Euro Mach 1" with Tremec, which comes with 1:3.55 LSD (i.e. not a Torsen as the US model), but apart from that, it is basically a non-HP US version, with all options included.
The first dealer was "adjusting" my shifter, because of my complain about a grinding noise in the 2nd gear (there is a thread in Mach 1 subforum on the topic, so it is not something unknown, but the definitive solution was not posted so far - apart from replacing the shifter with an aftermarket one - which I intend to do, but have not done yet). When I was asking what exactly they did to the shifter, the answer was that the technician "had adjusted it", which did not explain anything, but since I did not know at that time if the intervention helped at all, I let it be. Anyway, it is safe to assume he moved either the shifter mount, or might have touched even something else...
The guys fixing the fender liner should not come anywhere close to the drivetrain, they just remounted the engine bay deflector and redid the fender liner with pushpins.
So after those two repairs I noticed a new sound in the cabin. It only starts to appear when driving over 50-55 kph (would be 31-34 mph). I caught it first in the 4th gear, but then noticed it in the 3rd as well, and then realized it does not depend on the gear, but on the ground speed. I can hear it even when I put in neutral and/or push the clutch, so the engine is idling at 900 rpm. With a gear high enough to keep the engine quiet I can confirm it up to 70 kph (44 mph), after that I am not sure whether it fades out by itself, or just gets shadowed by the engine, or both. What is clear though is the lower limit. When driving slower I cannot hear that.
I tried to record it, but the recording turned out to be very subtle (it is much clearer in the real life) and difficult to use as a demonstration. However I was able to filter the recording to the point I could "measure" the frequency of the tick and it seems to be perfectly matching the rpms of the driveshaft (considering the ground speed and the diff ratio). The hypothesis that the problem is with the driveshaft also complements the other observations about being non dependent on the gears.
Now what I am wondering and hoping maybe someone might give some insights about is which part could fail to produce this behavior. I understand it should be related to the driveshaft, could be also the differential, but probably not the rear (or front) axle, since then the frequency of the tick will be different. The strange part is also how the manifestation depends on the speed the change from "not audible" to "clearly audible" is very well pronounced.
I am going to see my dealer ASAP, so any tips to what to ask them or tell them are also appreciated.
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, nor the central bearing (actually I was not able to see it at all). The bearing seems to be right above the resonator, plus it is being separated by the heat shield. So without removing the resonator and shield it can only be accessed along the driveshaft from the front or the back and it is quite deep from both sides. I could not get my hand there not even touch it.
