changed throttle body coolant hoses, slight loss in fuel economy...?

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Old 22 Jan 2009, 12:13 pm   #1 (permalink)
mrdarrett@gmail.com
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Default changed throttle body coolant hoses, slight loss in fuel economy...?

Last night the wife and kids went to bed early, so I thought this
would be a good time to replace those slightly-leaky throttle body
coolant hoses in my '96 camry (I'd had the other heater core hoses
replaced by a mechanic a couple years back, but apparently he forgot
the throttle body coolant hoses).

3 1/2 hours later, I was done. Man, what a job. Remove the air
intake hose, air resonator, throttle body, distributor cap... those
metal fasteners securing the coolant hoses were the worst. I must
have spent an hour on compressing / twisting those fasteners alone. I
replaced the clips with the screw-tighten style hose fasteners.
Draining coolant from the throttle body hoses wasn't fun either.

I drove around, and apparently the system holds coolant better, but I
noticed a slight decrease in fuel economy. Or maybe it's my
imagination. It was 2/3 full when I left my house, then 1/2 full
after I drove about 30 miles to work (after dropping the kids off to
their schools).

Everything seems connected (man there were a lot of hoses and
electrical connectors, but nothing seemed loose when I was done).
Pretty sure everything goes where they're supposed to. I did not
loosen the distributor "adjustment" bolt - only the 2 small bolts
securing the distributor cap. And yes I used a new distributor cap
gasket.

Thoughts, anyone? I'll do a full fuel consumption study next time I
fill up the tank...

Thanks,

Michael
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Old 05 Feb 2009, 12:29 pm   #2 (permalink)
mrdarrett@gmail.com
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Default Re: changed throttle body coolant hoses, slight loss in fueleconomy...?

On Jan 22, 10:13*am, mrdarr...@gmail.com wrote:
> Last night the wife and kids went to bed early, so I thought this
> would be a good time to replace those slightly-leaky throttle body
> coolant hoses in my '96 camry (I'd had the other heater core hoses
> replaced by a mechanic a couple years back, but apparently he forgot
> the throttle body coolant hoses).
>
> 3 1/2 hours later, I was done. *Man, what a job. *Remove the air
> intake hose, air resonator, throttle body, distributor cap... those
> metal fasteners securing the coolant hoses were the worst. *I must
> have spent an hour on compressing / twisting those fasteners alone. *I
> replaced the clips with the screw-tighten style hose fasteners.
> Draining coolant from the throttle body hoses wasn't fun either.
>
> I drove around, and apparently the system holds coolant better, but I
> noticed a slight decrease in fuel economy. *Or maybe it's my
> imagination. *It was 2/3 full when I left my house, then 1/2 full
> after I drove about 30 miles to work (after dropping the kids off to
> their schools).
>
> Everything seems connected (man there were a lot of hoses and
> electrical connectors, but nothing seemed loose when I was done).
> Pretty sure everything goes where they're supposed to. *I did not
> loosen the distributor "adjustment" bolt - only the 2 small bolts
> securing the distributor cap. *And yes I used a new distributor cap
> gasket.
>
> Thoughts, anyone? *I'll do a full fuel consumption study next time I
> fill up the tank...
>
> Thanks,
>
> Michael



Looks like it was just my imagination. I calculated 26 mpg (mixed
city/highway) after filling up yesterday.

No coolant leaks found.

Michael
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