1998 Avalon, noise ~2 seconds after startup

Hi all:
About 2 seconds or so (not precisely measured) after starting my '98
Avalon, there is a "ka-chunk" noise, like something locking into place
or starting up. It's not terribly loud, but it is audible inside the
car. It's not related to shifting into Reverse or Drive (it happens
before I even think about shifting). It's been happening for about 6
months now, and doesn't seem to be getting worse. I'm thinking it
might be a pump or part of the A/C heating system.

Any ideas?

If someone had a strong feeling that it was my water pump, I might
consider moving up my timing belt / water pump change. The car has 98k
on it, with the original timing belt, and there doesn't appear to be
any visible damage to the belt to my untrained eye, so I was going to
gamble for a while longer before getting the belt replaced.

Thoughts appreciated.
-Dan

"Danny L." <dan.lundberg@gmail.com> wrote in message
news:1134191751.806945.172150@z14g2000cwz.googlegroups.com...[color=blue]
> Hi all:
> About 2 seconds or so (not precisely measured) after starting my '98
> Avalon, there is a "ka-chunk" noise, like something locking into place
> or starting up. It's not terribly loud, but it is audible inside the
> car. It's not related to shifting into Reverse or Drive (it happens
> before I even think about shifting). It's been happening for about 6
> months now, and doesn't seem to be getting worse. I'm thinking it
> might be a pump or part of the A/C heating system.
>
> Any ideas?[/color]

"ka chunk" is difficult to diagnose without hearing it. A whining/grinding
noise is probably the ABS system doing a self-check. It may be the AC
compressor engaging. To check, turn off the AC compressor before turning
off the engine and then re-start to see if the noise goes away. Check your
transmisison fluid to see if it is bright red in color. If it is brown or
smells burnt, have it changed.
[color=blue]
>
> If someone had a strong feeling that it was my water pump, I might
> consider moving up my timing belt / water pump change. The car has 98k
> on it, with the original timing belt, and there doesn't appear to be
> any visible damage to the belt to my untrained eye, so I was going to
> gamble for a while longer before getting the belt replaced.
>
> Thoughts appreciated.
> -Dan[/color]

Water pumps generally do not make clunking noises or noises that go away.
More often, they leak before they make noise.

If you have 98k miles on the timing belt, you should have it changed. While
you're at it, you should consider changing the water pump because most of
the labor is redundant so you would only have to pay for the pump, gasket
material, and an extra half hour or so of labor. You cannot visually check
the timing belt without removing the timing belt cover. Are you talking
about the accessory drive (fan) belts? If so, you should also get them
changed while you're doing the timing belt.
--
Ray O
correct the return address punctuation to reply

Ray O wrote:[color=blue]
> If you have 98k miles on the timing belt, you should have it changed.
> While you're at it, you should consider changing the water pump
> because most of the labor is redundant so you would only have to pay
> for the pump, gasket material, and an extra half hour or so of labor.[/color]

You should make sure that your shop agrees to charge only for the
incremental labor. My Toyota dealer won't discount their 'flat rate'
schedule for combined repairs. That is one reason I no longer go there
for maintenance.

I agree with RayO about suspecting the air conditioning compressor. If you
have the defrost selected, it would engage the A/C. Besides turning it off
before starting, you could test this by having someone start the car and you
watch with the hood open. The clutch of the A/C would free wheel, then
engage with a "chunk". Watch those fingers!

G
"Danny L." <dan.lundberg@gmail.com> wrote in message
news:1134191751.806945.172150@z14g2000cwz.googlegroups.com...[color=blue]
> Hi all:
> About 2 seconds or so (not precisely measured) after starting my '98
> Avalon, there is a "ka-chunk" noise, like something locking into place
> or starting up. It's not terribly loud, but it is audible inside the
> car. It's not related to shifting into Reverse or Drive (it happens
> before I even think about shifting). It's been happening for about 6
> months now, and doesn't seem to be getting worse. I'm thinking it
> might be a pump or part of the A/C heating system.
>
> Any ideas?
>
> If someone had a strong feeling that it was my water pump, I might
> consider moving up my timing belt / water pump change. The car has 98k
> on it, with the original timing belt, and there doesn't appear to be
> any visible damage to the belt to my untrained eye, so I was going to
> gamble for a while longer before getting the belt replaced.
>
> Thoughts appreciated.
> -Dan
>[/color]

Thanks for the ideas everyone.
Transmission fluid was changed recently, and is still a good red. I
think you're right about the noise coming from the A/C compressor.

I guess I'll call around between the two toyota dealers and the more
reputable independent shops that do import work and see about getting
my timing belt and water pump replaced.

Total bill for that (parts and labor) should be around $300? Anything
else I should have them do while they're that deep into the engine
compartment?

Danny L. wrote:[color=blue]
> I guess I'll call around between the two toyota dealers and the more
> reputable independent shops that do import work and see about getting
> my timing belt and water pump replaced.[/color]

Hey Danny - it would be interesting to know which of the shops will
combine the labor charges, and which ones work strictly 'by the book'.
Please post back and let us know what you find.

Danny L. wrote:[color=blue]
> If someone had a strong feeling that it was my water pump, I might
> consider moving up my timing belt / water pump change. The car has
> 98k on it, with the original timing belt, and there doesn't appear to
> be any visible damage to the belt to my untrained eye, so I was going
> to gamble for a while longer before getting the belt replaced.[/color]

Just out of curiousity, how did you inspect the belt?

I didn't. I mistook the lower fan belt for the timing belt. In my
ignorance, I thought "well, I can see two belts. I know the upper one
isn't the timing belt, so the lower one must be the timing belt..."

Ah well, you win some, you lose some.

Danny L. wrote:[color=blue]
> I didn't. I mistook the lower fan belt for the timing belt. In my
> ignorance, I thought "well, I can see two belts. I know the upper one
> isn't the timing belt, so the lower one must be the timing belt..."[/color]

98K miles is the practical life limit for a Avalon belt. Time to
schedule the replacement.

"Travis Jordan" <no.one@no.net> wrote in message
news:8lHmf.577$Lc2.8@fe09.news.easynews.com...[color=blue]
> Danny L. wrote:[color=green]
>> I guess I'll call around between the two toyota dealers and the more
>> reputable independent shops that do import work and see about getting
>> my timing belt and water pump replaced.[/color]
>
> Hey Danny - it would be interesting to know which of the shops will
> combine the labor charges, and which ones work strictly 'by the book'.
> Please post back and let us know what you find.
>[/color]

When calculating flat rate times, you are supposed to use the labor for the
deepest operation, which would be for the water pump. The timing belt
should be charged only for the belt itself because the labor would be
covered under the water pump R&R.
--
Ray O
correct the return address punctuation to reply

Ray O wrote:[color=blue]
> When calculating flat rate times, you are supposed to use the labor
> for the deepest operation, which would be for the water pump. The
> timing belt should be charged only for the belt itself because the
> labor would be covered under the water pump R&R.[/color]

Maybe that is how you do it, or your garage does it, but my Toyota
dealer wouldn't do it that way.

In article <P3Ymf.4515$6T2.4098@fe01.news.easynews.com>, Travis Jordan
<no.one@no.net> wrote:
[color=blue]
> Ray O wrote:[color=green]
> > When calculating flat rate times, you are supposed to use the labor
> > for the deepest operation, which would be for the water pump. The
> > timing belt should be charged only for the belt itself because the
> > labor would be covered under the water pump R&R.[/color]
>
> Maybe that is how you do it, or your garage does it, but my Toyota
> dealer wouldn't do it that way.[/color]

Hello Travis...

Is that based on your personal experience? I can't imagine why there'd
be different practices among authorized Toyota stores.

Brent

Brent Secombe wrote:[color=blue]
> Is that based on your personal experience? I can't imagine why there'd
> be different practices among authorized Toyota stores.[/color]

Yes, it is. I had a timing belt done on a Camry and wanted the water
pump replaced at the same time; the service writer wouldn't cut me a
break on the labor costs -- he said they charged "by the job to be done
and not by the hour".

So I don't use that dealer any more. I don't know if other dealers
would handle it differently.

Travis Jordan wrote:[color=blue]
> Brent Secombe wrote:[color=green]
> > Is that based on your personal experience? I can't imagine why
> > there'd be different practices among authorized Toyota stores.[/color]
>
> Yes, it is. I had a timing belt done on a Camry and wanted the water
> pump replaced at the same time; the service writer wouldn't cut me a
> break on the labor costs -- he said they charged "by the job to be
> done and not by the hour".
>
> So I don't use that dealer any more. I don't know if other dealers
> would handle it differently.[/color]

I should have noted that was an Autoway Toyota dealer in central
Florida.

In article <2Y%mf.10860$1q6.5026@fe02.news.easynews.com>, Travis Jordan
<no.one@no.net> wrote:
[color=blue]
> Brent Secombe wrote:[color=green]
> > Is that based on your personal experience? I can't imagine why there'd
> > be different practices among authorized Toyota stores.[/color]
>
> Yes, it is. I had a timing belt done on a Camry and wanted the water
> pump replaced at the same time; the service writer wouldn't cut me a
> break on the labor costs -- he said they charged "by the job to be done
> and not by the hour".[/color]

Thank you, Travis. That's instructive. It changes my view of things.

Brent