Bad rattle on cold start
#1
Bad rattle on cold start
So my car makes this unpleasant noise on cold start:
It's essentially inaudible if the bonnet is shut, and I haven't heard it in-cabin, so I'm not sure how long it's been there.
It does sound an awful lot like this:
However, that's a 4.0 car, and I was under the impression that 4.2 cars should have any tensioner issues?
It's essentially inaudible if the bonnet is shut, and I haven't heard it in-cabin, so I'm not sure how long it's been there.
It does sound an awful lot like this:
However, that's a 4.0 car, and I was under the impression that 4.2 cars should have any tensioner issues?
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Yeah, 4.2's and 3.9's like what was in my LS. Sometimes they were quiet, sometimes pretty obnoxious. The N/A 3.9 valve train sounded like a sewing machine when wound past 6k. Sometimes my //R does at high RPM and sometimes not. Often wonder if it's the blower making noise or the valve train.
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The following 2 users liked this post by Cambo:
Aonsaithya (12-29-2018),
Queen and Country (12-28-2018)
#12
Thank you all. Just as I wrote earlier, the sound has yet to reappear, and I've opened the bonnet & listened on practically every start since then.
There are no fault codes, either. A moment ago I started the engine with the bonnet open, camera on tripod pointed at the engine to record any sounds, while I read codes with my i930; no codes, no weird sounds.
Cambo, I appreciate the diagnosis, but if it were the VVT carrier, wouldn't it make noise on every start, if not all the time?
There are no fault codes, either. A moment ago I started the engine with the bonnet open, camera on tripod pointed at the engine to record any sounds, while I read codes with my i930; no codes, no weird sounds.
Cambo, I appreciate the diagnosis, but if it were the VVT carrier, wouldn't it make noise on every start, if not all the time?
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"Liqui Moly Special TEC F 5W-30" it would seem, last changed 6 months ago.
The sound reappeared on the day before yesterday, when it was again sub-zero outside. It was very faint, but I noticed it when driving at a low speed, and only when on throttle even slightly. I stopped to listen about 5 minutes after startup, and it was audible just as it was before. I drove to work and the sound still remained as I parked, so engine warming up does not appear to affect it.
I park in an underground garage (15°C/59°F), and as I somewhat already expected, the sound was gone when I started the car as I was leaving work. It hasn't appeared again, but temperature dropped rapidly today so I fully expect to hear it tomorrow morning.
I've also paid more attention to the hiss Q&C pointed out; it's very audible, but I'm no mechanic so I'm trying to book a time for it to get looked at...
The sound reappeared on the day before yesterday, when it was again sub-zero outside. It was very faint, but I noticed it when driving at a low speed, and only when on throttle even slightly. I stopped to listen about 5 minutes after startup, and it was audible just as it was before. I drove to work and the sound still remained as I parked, so engine warming up does not appear to affect it.
I park in an underground garage (15°C/59°F), and as I somewhat already expected, the sound was gone when I started the car as I was leaving work. It hasn't appeared again, but temperature dropped rapidly today so I fully expect to hear it tomorrow morning.
I've also paid more attention to the hiss Q&C pointed out; it's very audible, but I'm no mechanic so I'm trying to book a time for it to get looked at...
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In other words eliminate the fluke. Because sometimes mechanics do more than necessary because customer gave them incorrect clues.
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I would recreate this situation again before going to the mechanic so that you can give him some concrete evidence as to under what conditions the noise happens.
In other words eliminate the fluke. Because sometimes mechanics do more than necessary because customer gave them incorrect clues.
In other words eliminate the fluke. Because sometimes mechanics do more than necessary because customer gave them incorrect clues.
I guess the best course of action would indeed be to look at the forecasts and take the car in to get checked on a cold morning.
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Well, the noise reappeared on a few cold enough days, but on the days I had the time to take the car to get looked at, it wasn't as cold.
The hissing was checked out however, but in the end they concluded that they could find no leaks. They also had a 4.2 X350 in, and said they started it up and it made the same hissing noise. Thus, I'll just accept that it's normal.
I'm too paranoid for this stuff, maybe I should just always listen to music while driving.
The hissing was checked out however, but in the end they concluded that they could find no leaks. They also had a 4.2 X350 in, and said they started it up and it made the same hissing noise. Thus, I'll just accept that it's normal.
I'm too paranoid for this stuff, maybe I should just always listen to music while driving.
The following users liked this post:
Queen and Country (01-11-2019)
#19
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Aonsaithya (01-11-2019)
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