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98 ES300 Poor gas mileage?

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Old 06-21-09, 04:55 PM   #1
gmacrae
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Default 98 ES300 Poor gas mileage?

Hi guys. I'm usually found in the LS forums, but am here to help my Dad get his gas mileage better with his 98 ES300

The car does run well and has been well maintained, 150,000kms roughly.

It gets around 20mpg with gentle highway driving which makes it more thirsty than my LS400. Other than the poor gas mileage, the only thing the car does wrong is a high idle when its cold, higher than what i consider a normal cold idle, it's over 2000rpm. I would expect around 1200-1500 to be normal on cold start.

Any ideas? I'm thinking something along the lines of coolant temp sensor, maybe o2 sensors? Is there a common fault i should be looking for?

Thanks for any input guys

Gene
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Old 06-21-09, 06:31 PM   #2
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Throttle body cleaning, MAF cleaning, change filter, and Fuel injector cleaner will help.. Start with the basics first... GL..
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Old 06-21-09, 11:36 PM   #3
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On top of ^, I'd also do the Seafoam through the brake booster line. But the best thing to do right off the bat is clean the throttle body like ^ said.
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Old 06-30-09, 01:52 AM   #4
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dirty throttle body could affect gas mileage? Really?

What do you guys think about the coolant temp sensor? We'll probably do this anyway but can it make a difference in the ES's like the LS's?

Cheers

Gene
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