95 Camry 4 Cyl Distributor Timing Adjustment

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Old 14 Nov 2004, 04:10 pm   #1 (permalink)
Mark
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Default 95 Camry 4 Cyl Distributor Timing Adjustment

I wanted to adjust the timing on my 95 Camry with the 4 Cyl engine. I
loosened the one distributor hold down bolt that was obviously visable
but I could not turn the distributor.

Is there another hold down bolt below where I can't see it?

Is there only the one hold down bolt and I just need to use more
muscle?

Is the timing adjustable on this car?

The car is running fine. I usually advance the timing on my cars till
it pings then back it off a bit.

Please reply here in the NG, I don't check this e-mail address.
thanks

Mark
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Old 14 Nov 2004, 05:00 pm   #2 (permalink)
m Ransley
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Default Re: 95 Camry 4 Cyl Distributor Timing Adjustment

Use a timing light , light pinging cant be heard but will damage a
motor, you also run cilinders hotter the more you advance, unless you
then pull the plugs you wont know if you need colder plugs. Try 1 degree
from set point if you must, but factory specs are for milage, power and
gas considerations.

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Old 14 Nov 2004, 05:29 pm   #3 (permalink)
camry-keeper
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Default Re: 95 Camry 4 Cyl Distributor Timing Adjustment

There is a second bolt directly underneath the distributor. A 6 inch socket
extension works fine. Removing the air cleaner assembly helps for access,
and isn't too difficult...also gives access to fuel filter. I just
replaced the distributor O-ring ($4.50) since it was leaking badly on my
1995 I4.

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Old 14 Nov 2004, 06:34 pm   #4 (permalink)
William W. Plummer
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Default Re: 95 Camry 4 Cyl Distributor Timing Adjustment

Mark wrote:

> I wanted to adjust the timing on my 95 Camry with the 4 Cyl engine. I
> loosened the one distributor hold down bolt that was obviously visable
> but I could not turn the distributor.
>
> Is there another hold down bolt below where I can't see it?
>
> Is there only the one hold down bolt and I just need to use more
> muscle?
>
> Is the timing adjustable on this car?
>
> The car is running fine. I usually advance the timing on my cars till
> it pings then back it off a bit.
>
> Please reply here in the NG, I don't check this e-mail address.
> thanks
>
> Mark

Why do you want to adjust the timing? The computer takes care of it
all. It's not like the old days when you had to adjust timing after
replacing the points.
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Old 14 Nov 2004, 07:18 pm   #5 (permalink)
m Ransley
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Default Re: 95 Camry 4 Cyl Distributor Timing Adjustment

Wrong William the distributor must be set as on all cars with
distributors, early cars with points used mechanical systems, as your
timing belt stretches-gets old timing is retarded and you loose power.
There is a timing indicator on the engine and a timing light must be
used, read a manual.

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Old 15 Nov 2004, 08:45 am   #6 (permalink)
Jason James
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Default Re: 95 Camry 4 Cyl Distributor Timing Adjustment


"William W. Plummer" <William.Plummer-NOSPAM-@alum.mit.edu> wrote in message
news:IQSld.406610$D%.167136@attbi_s51...
> Mark wrote:
>
> > I wanted to adjust the timing on my 95 Camry with the 4 Cyl engine. I
> > loosened the one distributor hold down bolt that was obviously visable
> > but I could not turn the distributor.
> >
> > Is there another hold down bolt below where I can't see it?
> >
> > Is there only the one hold down bolt and I just need to use more
> > muscle?
> >
> > Is the timing adjustable on this car?
> >
> > The car is running fine. I usually advance the timing on my cars till
> > it pings then back it off a bit.
> >
> > Please reply here in the NG, I don't check this e-mail address.
> > thanks
> >
> > Mark

> Why do you want to adjust the timing? The computer takes care of it
> all. It's not like the old days when you had to adjust timing after
> replacing the points.


Unfortunately the *base-idle* advance is adjusted by physically rotating the
dizzy a la old style. The computer still adjusts the timing as manifold
vacuum, revs change, but it know way of knowing what the reference or idle
advance figure is.

I like the flywheel pickup design for electronic ignition,..less room for
screw-ups there.

The knock-sensor is the wildcard here tho. You could have a base-idle adv
figure too far advanced but still enjoy the protection the knock sensor
provides ie if the engine pings or knocks due too much adv,..the computer
rips off adv until the knocking stops. Not sure how accurate it does this
tho,....Suffice to say, if you have access to fuel which falls within the
normal range of octane variation,..then setting the base-idle adv correctly
is the best policy.

If your fuel supply was grossly different in octane to normal,..some minor
adjustment may produce results (talking a couple of degrees only here).

Jason


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Old 15 Nov 2004, 11:36 am   #7 (permalink)
Daniel M. Dreifus
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Default Re: 95 Camry 4 Cyl Distributor Timing Adjustment

makolber@yahoo.com (Mark) wrote in message news:<3367f36e.0411141410.6ceab24a@posting.google. com>...
>
> Is the timing adjustable on this car?
>
> The car is running fine. I usually advance the timing on my cars till
> it pings then back it off a bit.


IMHO that would be a mistake.
The electronic timing control and feedback circuits in your Camry are
fairly sophisticated. I remember reading the factory repair manual
about troubleshooting the igniter, and they described how the ECM
checks for spark on each engine revolution, then adjusting for engine
speed, temperature, and other parameters I've forgotten, establishes
the advance saturation time for the igniter for the next engine
revolution, and confirms when the spark has fired.
The ignition timing is set with a jumper across two pins at the under
hood diagnostic port to disable initial advance. The engine light on
the dash will flash constantly when the pins are jumpered.
Personally, I found it easier to work on the distributor with the air
cleaner removed, and a shop light illuminating the area.
The nice part about the Toyota engine management system you have, is
that there's an air gap and an inductive pick up, so there should be
very little mechanical wear. Nothing like ignition points with rubbing
block wear that needs to be compensated periodically.
If you replace the timing belt, the timing should be right at the
factory setting.
Again, my personal preference, I'd just make sure the timing belt is
pre tensioned properly when you install it, and not worry about
adjusting ignition timing to compensate for belt stretch, because
you'll be setting it back every time you replace the belt.
When I installed the timing belt, I exerted a lot of extra force on
the tensioner pulley to pull out all possible slack and initial
stretch, then let a new tensioning spring retain the correct tension
when tightening it down. Since I also replaced both idlers, and the
water pump, hopefully there's zero play in the bearings where the
timing belt turns. (the two idlers were noisy when turned by hand)
Wound up setting the ignition timing because I removed the distributor
to change the distributor O-ring (hard and brittle, broke in pieces
when removed, had been seeping slightly).
Apart from that, I'm just glad timing rarely if ever requires
adjustment. Was trying to avoid adjusting at all, but seems my marks
weren't as precise as I would have liked, so it was a few degrees off.
On the old 1967 VW bug, I used to use a cellophane cigarette wrapper
to set ignition timing, or a static timing light (a bulb with two
wires and alligator clips). There, perhaps you could make a better
case for timing by ear - advancing until it pings and then backing off
a bit. There was a mechanical advance with small weights and springs
that could lose tension, but with the all electronic systems in the
Camry, especially if it is running well, leave well enough alone.
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Old 15 Nov 2004, 05:47 pm   #8 (permalink)
Mark
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Default Re: 95 Camry 4 Cyl Distributor Timing Adjustment

"Jason James" <vellicet@bigpond.com> wrote in message news:<2vrtm2F2pdjhpU1@uni-berlin.de>...
> "William W. Plummer" <William.Plummer-NOSPAM-@alum.mit.edu> wrote in message
> news:IQSld.406610$D%.167136@attbi_s51...
> > Mark wrote:
> >
> > > I wanted to adjust the timing on my 95 Camry with the 4 Cyl engine. I
> > > loosened the one distributor hold down bolt that was obviously visable
> > > but I could not turn the distributor.
> > >
> > > Is there another hold down bolt below where I can't see it?
> > >
> > > Is there only the one hold down bolt and I just need to use more
> > > muscle?
> > >
> > > Is the timing adjustable on this car?
> > >
> > > The car is running fine. I usually advance the timing on my cars till
> > > it pings then back it off a bit.
> > >
> > > Please reply here in the NG, I don't check this e-mail address.
> > > thanks
> > >
> > > Mark

> > Why do you want to adjust the timing? The computer takes care of it
> > all. It's not like the old days when you had to adjust timing after
> > replacing the points.

>
> Unfortunately the *base-idle* advance is adjusted by physically rotating the
> dizzy a la old style. The computer still adjusts the timing as manifold
> vacuum, revs change, but it know way of knowing what the reference or idle
> advance figure is.
>
> I like the flywheel pickup design for electronic ignition,..less room for
> screw-ups there.
>
> The knock-sensor is the wildcard here tho. You could have a base-idle adv
> figure too far advanced but still enjoy the protection the knock sensor
> provides ie if the engine pings or knocks due too much adv,..the computer
> rips off adv until the knocking stops. Not sure how accurate it does this
> tho,....Suffice to say, if you have access to fuel which falls within the
> normal range of octane variation,..then setting the base-idle adv correctly
> is the best policy.
>
> If your fuel supply was grossly different in octane to normal,..some minor
> adjustment may produce results (talking a couple of degrees only here).
>
> Jason



OK thanks, I 'll look for that second bolt that the other poster
mentioned.

Does this car (95 Camry 4 cyl) have a knock sensor? I didn't think
that it did.

Yes I understand that the distributor must set the base timing info
sent to the computer and the computer will adjust the retard/advance
from there in a open loop manner based on the vacum and throttle pos
sensor etc and pre set program. It can also adjust in a closed loop
manner only if there is a knock sensor.

Does this car have a knock sensor?

tanks

Mark
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Old 15 Nov 2004, 07:21 pm   #9 (permalink)
HachiRoku
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Default Re: 95 Camry 4 Cyl Distributor Timing Adjustment

On Sun, 14 Nov 2004 14:10:41 -0800, Mark wrote:

> I wanted to adjust the timing on my 95 Camry with the 4 Cyl engine. I
> loosened the one distributor hold down bolt that was obviously visable
> but I could not turn the distributor.
>
> Is there another hold down bolt below where I can't see it?
>
> Is there only the one hold down bolt and I just need to use more
> muscle?
>
> Is the timing adjustable on this car?
>
> The car is running fine. I usually advance the timing on my cars till
> it pings then back it off a bit.
>
> Please reply here in the NG, I don't check this e-mail address.
> thanks
>
> Mark



WHY? Is the car running OK? Generally on the newer Toys, you reaslly don't
want to mess with the timing. The ECU will generally compensate for it.
You may also need some special equip, like the right tach (notice, right
tach. Some will blow the electronics!)

If you're trying to squeeze some performance/gas mileage out of it, don't.
It ain't like the Goodle days when you jumpered a plug and had at with a
timing light!
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Old 15 Nov 2004, 08:47 pm   #10 (permalink)
m Ransley
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Default Re: 95 Camry 4 Cyl Distributor Timing Adjustment

You can get a major performance boost by going back to specs on a old
stretched belt. My factory belt stretched out 4 degrees in 50000m
Putting it back in speck was a big power and milage booster. 8 cil
engines were not so sensitive. So if your belt is old a 15$ timing light
is a good investment

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