scent of a motor

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Old 25 Mar 2005, 08:15 am   #1 (permalink)
badgolferman
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Default scent of a motor

97 Camry 4, 104K miles.

With the heater on and fan running there is a faint odor of exhaust
when sitting still. This odor is unnoticeable when moving. I have
suspected vehicles in front of me emitting fumes that are sucked in by
the fresh air cowling, but it makes no difference whether I am behind
someone or completely alone.

On Monday I had the car at the dealer for annual safety inspection and
mentioned the odor. The mechanic said I had no exhaust leaks since it
would be heard rather than smelled.

I have not noticed any leaks or radiator fluid loss. There is no smoke
emitted from the engine compartment. Is there anything else to check
other than my head?

--
No matter what happens, someone will find a way to take it too
seriously.
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Old 25 Mar 2005, 09:53 am   #2 (permalink)
davidj92
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Default Re: scent of a motor

badgolferman wrote:
> 97 Camry 4, 104K miles.
>
> With the heater on and fan running there is a faint odor of exhaust
> when sitting still. This odor is unnoticeable when moving. I have
> suspected vehicles in front of me emitting fumes that are sucked in by
> the fresh air cowling, but it makes no difference whether I am behind
> someone or completely alone.
>
> On Monday I had the car at the dealer for annual safety inspection and
> mentioned the odor. The mechanic said I had no exhaust leaks since it
> would be heard rather than smelled.
>
> I have not noticed any leaks or radiator fluid loss. There is no
> smoke emitted from the engine compartment. Is there anything else to
> check other than my head?


The mechanic is wrong. Some exhaust leaks cannot be heard due to position of
leak, strength of leak, insulation, engine noise and etc. If it is migrating
into the cabin this can be lethal if breathed for a prolonged period. With
engine running have someone put a rag over the end of the exhaust while you
listen along the length of the vehicle. On a lift is best if you have access
to one. Many undetectable leaks will make a loud enough sound due to the
increased exhaust pressure to be heard.
HTH, davidj92


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Old 25 Mar 2005, 11:40 am   #3 (permalink)
m Ransley
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Default Re: scent of a motor

Do you have a home Co detector with digital display and battery backup,
put it in the car. Or plug it in and let the car idle. It may not be
high enough to alarm but will register and record any Co level if it is
digital display with Peak Co memory. Then you will know. Nighthawk apx
35$ But some models alarm without 120vac even thought they operate.

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Old 25 Mar 2005, 02:56 pm   #4 (permalink)
Jason James
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Default Re: scent of a motor


"badgolferman" <REMOVETHISbadgolferman@gmail.com> wrote in message
news:xn0e062gb0000000@news.individual.net...
> 97 Camry 4, 104K miles.
>
> With the heater on and fan running there is a faint odor of exhaust
> when sitting still. This odor is unnoticeable when moving. I have
> suspected vehicles in front of me emitting fumes that are sucked in by
> the fresh air cowling, but it makes no difference whether I am behind
> someone or completely alone.
>
> On Monday I had the car at the dealer for annual safety inspection and
> mentioned the odor. The mechanic said I had no exhaust leaks since it
> would be heard rather than smelled.
>
> I have not noticed any leaks or radiator fluid loss. There is no smoke
> emitted from the engine compartment. Is there anything else to check
> other than my head?


Apart from straight exhaust smells, there is another type and cause which
occurs in engines which are generating too much blow-by due compression-ring
wear. The PCV system usually causes blow-by fumes to be reburned by sucking
them back into the inlet.
If the BB is getting out and is being sucked into the car's AC air intake,
the smell has a distinctly 'fuel' type odor.

Jason


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Old 25 Mar 2005, 04:38 pm   #5 (permalink)
Philip
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Default Re: scent of a motor

Jason James wrote:
> "badgolferman" <REMOVETHISbadgolferman@gmail.com> wrote in message
> news:xn0e062gb0000000@news.individual.net...
>> 97 Camry 4, 104K miles.
>>
>> With the heater on and fan running there is a faint odor of exhaust
>> when sitting still. This odor is unnoticeable when moving. I have
>> suspected vehicles in front of me emitting fumes that are sucked in
>> by
>> the fresh air cowling, but it makes no difference whether I am behind
>> someone or completely alone.
>>
>> On Monday I had the car at the dealer for annual safety inspection
>> and mentioned the odor. The mechanic said I had no exhaust leaks
>> since it would be heard rather than smelled.
>>
>> I have not noticed any leaks or radiator fluid loss. There is no
>> smoke emitted from the engine compartment. Is there anything else
>> to check other than my head?

>
> Apart from straight exhaust smells, there is another type and cause
> which occurs in engines which are generating too much blow-by due
> compression-ring wear. The PCV system usually causes blow-by fumes to
> be reburned by sucking them back into the inlet.
> If the BB is getting out and is being sucked into the car's AC air
> intake, the smell has a distinctly 'fuel' type odor.
>
> Jason


Two part test Question: A) In a "closed type" ventilation system, if the
PCV's flow is less than the volume of vapor escaping the crankcase, the
excess vapor goes .... where? B) From the breather pipe juntion (located
between the air filter and the throttle body), how can this excess crankcase
vapor excape into the air for you to smell?

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- Philip




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Old 25 Mar 2005, 09:26 pm   #6 (permalink)
Art
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Default Re: scent of a motor

How about distributor O ring failure and a light miss of oil being thrown up
and burnt and smell being sucked into the ventilation. Look at the
underside of the hood for oil residue.


"badgolferman" <REMOVETHISbadgolferman@gmail.com> wrote in message
news:xn0e062gb0000000@news.individual.net...
> 97 Camry 4, 104K miles.
>
> With the heater on and fan running there is a faint odor of exhaust
> when sitting still. This odor is unnoticeable when moving. I have
> suspected vehicles in front of me emitting fumes that are sucked in by
> the fresh air cowling, but it makes no difference whether I am behind
> someone or completely alone.
>
> On Monday I had the car at the dealer for annual safety inspection and
> mentioned the odor. The mechanic said I had no exhaust leaks since it
> would be heard rather than smelled.
>
> I have not noticed any leaks or radiator fluid loss. There is no smoke
> emitted from the engine compartment. Is there anything else to check
> other than my head?
>
> --
> No matter what happens, someone will find a way to take it too
> seriously.



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Old 25 Mar 2005, 09:53 pm   #7 (permalink)
badgolferman
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Default Re: scent of a motor

Art wrote:

> How about distributor O ring failure and a light miss of oil being
> thrown up and burnt and smell being sucked into the ventilation.
> Look at the underside of the hood for oil residue.
>


I may be wrong, but I don't think this vehicle has a distributor. Is
that possible?

--
No matter what happens someone will find a way to take it too seriously.
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Old 25 Mar 2005, 09:56 pm   #8 (permalink)
badgolferman
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Default Re: scent of a motor

Jason James wrote:

> Apart from straight exhaust smells, there is another type and cause
> which occurs in engines which are generating too much blow-by due
> compression-ring wear. The PCV system usually causes blow-by fumes to
> be reburned by sucking them back into the inlet.
> If the BB is getting out and is being sucked into the car's AC air
> intake, the smell has a distinctly 'fuel' type odor.
>
> Jason


I doubt the PCV valve has ever been replaced. Do you think this may be
the culprit?

When you say compression-ring, is that the piston rings? This car had
an engine overhaul around 60K miles and that was one of the things
replaced.

--
No matter what happens someone will find a way to take it too seriously.
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Old 25 Mar 2005, 11:08 pm   #9 (permalink)
Jason James
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Default Re: scent of a motor


"badgolferman" <REMOVETHISbadgolferman@gmail.com> wrote in message
news:xn0e06o0zfru2au001@news.individual.net...
> Jason James wrote:
>
> > Apart from straight exhaust smells, there is another type and cause
> > which occurs in engines which are generating too much blow-by due
> > compression-ring wear. The PCV system usually causes blow-by fumes to
> > be reburned by sucking them back into the inlet.
> > If the BB is getting out and is being sucked into the car's AC air
> > intake, the smell has a distinctly 'fuel' type odor.
> >
> > Jason

>
> I doubt the PCV valve has ever been replaced. Do you think this may be
> the culprit?


Only if the engine is also fuming excessively.

> When you say compression-ring, is that the piston rings?


Yep.

This car had
> an engine overhaul around 60K miles and that was one of the things
> replaced.


If the engine was overhauled, then BB is not likely to be the cause.

Jason


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Old 25 Mar 2005, 11:13 pm   #10 (permalink)
Jason James
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Default Re: scent of a motor


"Philip" <1chip-state1@earthlink.n0t> wrote in message
news:up01e.3875$z.1987@newsread2.news.atl.earthlin k.net...
> Jason James wrote:
> > "badgolferman" <REMOVETHISbadgolferman@gmail.com> wrote in message
> > news:xn0e062gb0000000@news.individual.net...
> >> 97 Camry 4, 104K miles.
> >>
> >> With the heater on and fan running there is a faint odor of exhaust
> >> when sitting still. This odor is unnoticeable when moving. I have
> >> suspected vehicles in front of me emitting fumes that are sucked in
> >> by
> >> the fresh air cowling, but it makes no difference whether I am behind
> >> someone or completely alone.
> >>
> >> On Monday I had the car at the dealer for annual safety inspection
> >> and mentioned the odor. The mechanic said I had no exhaust leaks
> >> since it would be heard rather than smelled.
> >>
> >> I have not noticed any leaks or radiator fluid loss. There is no
> >> smoke emitted from the engine compartment. Is there anything else
> >> to check other than my head?

> >
> > Apart from straight exhaust smells, there is another type and cause
> > which occurs in engines which are generating too much blow-by due
> > compression-ring wear. The PCV system usually causes blow-by fumes to
> > be reburned by sucking them back into the inlet.
> > If the BB is getting out and is being sucked into the car's AC air
> > intake, the smell has a distinctly 'fuel' type odor.
> >
> > Jason

>
> Two part test Question: A) In a "closed type" ventilation system, if the
> PCV's flow is less than the volume of vapor escaping the crankcase, the
> excess vapor goes .... where? B) From the breather pipe juntion (located
> between the air filter and the throttle body), how can this excess

crankcase
> vapor excape into the air for you to smell?


Yes Phil,.....but I said, "if the BB (excessive fumes due wear) is getting
out"

Have you seen the inside of an engine bay with a badly fuming motor with an
enclosed PCV system, after its been cruising at motorway speed? What did you
observe?

Jason


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