Will somebody offer an explanation to my start-up noise?
#1
Will somebody offer an explanation to my start-up noise?
I have been reluctant to ask my question here for far too long. it brings me shame that I can only ever ask for help and not offer any.
where I live there are no jaguar dealers or specialists and I get the feeling at every auto shop that I visit that they want nothing to do with my car, which makes asking them specified questions exhausting and without point. that isn't the case in a forum where everyone shares advice for the sake of helping
my 97 xj6 runs fine. when the engine has been off for approximately 4-9 hours or so, it starts up as it should.
when I shut her off to refuel on petrol and then start it up - still uneventful. however, when I park at the grocery store for 30 minutes and come to start it, an awful grinding noise can be heard coming from under the bonnet it seems.
this has been present for about as long as I've had the car since last November. I'm going to be living in my car for a while so I can't afford to have something major malfunction on me while out there. any suggestions appreciated as always.
where I live there are no jaguar dealers or specialists and I get the feeling at every auto shop that I visit that they want nothing to do with my car, which makes asking them specified questions exhausting and without point. that isn't the case in a forum where everyone shares advice for the sake of helping
my 97 xj6 runs fine. when the engine has been off for approximately 4-9 hours or so, it starts up as it should.
when I shut her off to refuel on petrol and then start it up - still uneventful. however, when I park at the grocery store for 30 minutes and come to start it, an awful grinding noise can be heard coming from under the bonnet it seems.
this has been present for about as long as I've had the car since last November. I'm going to be living in my car for a while so I can't afford to have something major malfunction on me while out there. any suggestions appreciated as always.
Last edited by GGG; 10-09-2015 at 02:38 AM. Reason: reduce font size
#2
Without actually hearing the grinding noise, two immediate thoughts come to mind:
1. loose Starter Motor securing bolts (lower one arrowed in blue)
2. worn Bendix (arrowed in red) and or damaged starter ring on the flywheel
When the ignition key is turned, the starter motor rotates and the Bendix which is engaged with a toothed ring on the flywheel rotates the engine (apologies if that explanation is unnecessarily basic for you!).
Graham
1. loose Starter Motor securing bolts (lower one arrowed in blue)
2. worn Bendix (arrowed in red) and or damaged starter ring on the flywheel
When the ignition key is turned, the starter motor rotates and the Bendix which is engaged with a toothed ring on the flywheel rotates the engine (apologies if that explanation is unnecessarily basic for you!).
Graham
Last edited by GGG; 10-09-2015 at 02:52 AM.
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stupid (10-09-2015)
#3
I agree with Graham, and add the following:
The top timing chain tensioner gives an unholy rattle/gind/clatter when it has its moments. It is a very common failure item. It will NOT destroy the engine, it just is a "Non-Jaguar" sound that scares the hell out of the unaware onwer.
There are heaps of write ups on this in this section.
Maybe even a "stickie" at the top?.
The top timing chain tensioner gives an unholy rattle/gind/clatter when it has its moments. It is a very common failure item. It will NOT destroy the engine, it just is a "Non-Jaguar" sound that scares the hell out of the unaware onwer.
There are heaps of write ups on this in this section.
Maybe even a "stickie" at the top?.
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stupid (10-09-2015)
#4
I wondered about the timing chain tensioner too, but from the description that it didn't make a noise on start up from cold, discarded that idea. I have the timing chain start up issue, but it only does it on the first start of the day from cold. All starts thereafter are fine until it is left for several hours and gets fully cold again.
Does the grinding noise last for long, or is it just a few seconds?
Does the grinding noise last for long, or is it just a few seconds?
The following 2 users liked this post by countyjag:
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stupid (10-09-2015)
#5
I appreciate everyone's input. countyjag, the grinding noise that I mention only happens for a second. on start-up the engine will roar to life as usual and the grinding noise follows almost simultaneously. I should really record the sound. it sounds as if I'm trying to start an engine that's already running
#6
I appreciate everyone's input. countyjag, the grinding noise that I mention only happens for a second. on start-up the engine will roar to life as usual and the grinding noise follows almost simultaneously. I should really record the sound. it sounds as if I'm trying to start an engine that's already running
#7
I wondered about the timing chain tensioner too, but from the description that it didn't make a noise on start up from cold, discarded that idea. I have the timing chain start up issue, but it only does it on the first start of the day from cold. All starts thereafter are fine until it is left for several hours and gets fully cold again.
Does the grinding noise last for long, or is it just a few seconds?
Does the grinding noise last for long, or is it just a few seconds?
Then remember that Jags are female, nuff said.
My 3.2 did the exact same, and the noise was not there at cold very often, but that hot restart after a few minutes, sometimes seconds, gave that horror.
I finally deducted that it really depended where the engine stopped in its 360deg rotation, and the "backload" of the cam lobes on the chain, that was the real cause of the tensioner and blade rattle.
Mine had the uograde unit, but a new one shut it up 100%, BUT, 140000kms later I hear it again, oops.
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#8
I appreciate everyone's input. countyjag, the grinding noise that I mention only happens for a second. on start-up the engine will roar to life as usual and the grinding noise follows almost simultaneously. I should really record the sound. it sounds as if I'm trying to start an engine that's already running
#9
#10
Haha!
It's pretty rare that I get the noise, happens maybe a few times a month. I do this every time I start the car now, just for good measure. A few times it almost sounded like the engine was about to flood, though, definitely scared me--happened in the same scenarios, car was off for about 30 minutes. Guess it's pick your poison. Maybe my injectors could use cleaning at almost 260,000 km...
It's pretty rare that I get the noise, happens maybe a few times a month. I do this every time I start the car now, just for good measure. A few times it almost sounded like the engine was about to flood, though, definitely scared me--happened in the same scenarios, car was off for about 30 minutes. Guess it's pick your poison. Maybe my injectors could use cleaning at almost 260,000 km...
#11
#12
I truly appreciate everybody's input. I've had a hunch it could be the starter running on as JTsmks said. I should also mention that a much quieter but still audible grinding can be heard when I'm accelerating from zero to about 30mph, after that it's gone. it sounds like it could be associated with the grind I hear on start up.
I asked a mechanic about this but he said if it were the starter than it would be constantly grinding, not stop at certain speeds
I asked a mechanic about this but he said if it were the starter than it would be constantly grinding, not stop at certain speeds
#13
I truly appreciate everybody's input. I've had a hunch it could be the starter running on as JTsmks said. I should also mention that a much quieter but still audible grinding can be heard when I'm accelerating from zero to about 30mph, after that it's gone. it sounds like it could be associated with the grind I hear on start up. I asked a mechanic about this but he said if it were the starter than it would be constantly grinding, not stop at certain speeds
#14
I've decided that some on start is timing with the starter adding to it. The driving from zero to about 1800 RPM is timing. Mine was doing it at 30k so my thought is I go through all the trouble of changing everything for it to just do it again. Mine has 92k on it now and has always done it since I got it at 30k, like I said, no worse for wear. I just live with it, use quality oil at regular intervals and throw in a can of STP between changes. To lessen it at start leaving the key on for 5 to 10 seconds before start seems to help.
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stupid (10-10-2015)
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