Hi...my car idles smoothly when cold, then when it gets warmed up it idles very low and i also notice my fuel consumption in the mornings after cold start is much more than when i drive the same distance in the evening back home ...could this be the symptom of a stuck opened thermostat? 2005 toyota yaris 1.3 2nzfe. please help me out here someone

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have you had the shift interlock checked or adjusted ...it may just be its out of adjustment ... that will give you both symptoms

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I would suggest hat you replace the timing belt. The noise that you hear is the belt.

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have someone pump the pedal and hold it, then you work from the right rear, left rear, right front, left front, while the person pumps and holds several times at each wheel.

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change fuel filter, add a can of SEAFOAM to tank of PREMIUM this 1 time. you have EGS(ethanol gas syndrome), and sounds like its very bad in your car. The corn by-product in your fuel creates a goop and puts lots of water in every part of your systems. you egr valve and your engine valves are heavily carbonized right now and need help.<p>
Your injector spray is next to nothing. Your ECM controls the amount of fuel spray to your engine, and it the injectors are partially clogged, it tells the injectors to spray more to keep up;thus causing flooding.<p>
I know it's alot to take in; but trust me, it's not fatal.<p>
You may have to change your fuel filter again at 500 miles to get the last of it out, so if you do, you do.<p>
Add SF every 3-5000 miles after this, and it will keep everything clean,unclogged, and carbon clean. GOOD LUCK

Kelly

• 3740 Answers
• Posted on Feb 18, 2010

SOURCE: 1986 toyota corolla 2E engine high fuel consumption

A dirty air cleaner will cause an engine to use lots of fuel and still appear to run fine especally in cold weather. If you have not changed your air cleaner in sometime do so and note the difference.

Also a sticking EGR valve i.e stuck closed at highway speeds / passing / starts and stops can rob you of fuel economy.

If you know any half way good backyard auto mechanics they will know how to test an EGR valve with an external vacuum hose.

Thanks for using FixYa!

Kelly

Testimonial: "Thanks a lot. Already changed air filter but problem persists. Shall have to check the EGR valve by mechanics. Thanks again."