Tooter manifold / Corolla TB / DC Header / etc....

[3cyltrbo]

Originally Posted by CTScott

Based on Jason's expertise, I would do the thermostat first. As a quick and dirty test today, drive it and see if the green coolant light goes off. If it stays on and green, then you are in "cold start" mode. If it goes out, then the thermostat is likely not the issue.

Green coolant light???

um????

I think I have a blue???? light when the engine is cold, but it goes out almost instantly in the summer, and only stays on briefly in the fall and spring.

I actually know the exact water temps because I've been driving around staring at my Scan Guage. ............................???

[CTScott]

Originally Posted by 3cyltrbo

Green coolant light???

um????

I think I have a blue???? light when the engine is cold, but it goes out almost instantly in the summer, and only stays on briefly in the fall and spring.

I actually know the exact water temps because I've been driving around staring at my Scan Guage. ............................???

OK. On the Canadian clusters it must be different. On the US ones we have a little green indicator. Mine takes about 1/2 mile from my house to go out.

What are you seeing for temps? Normally the Yaris will sit in the low to mid 180's F when cruising.

[3cyltrbo]

Originally Posted by CTScott

OK. On the Canadian clusters it must be different. On the US ones we have a little green indicator. Mine takes about 1/2 mile from my house to go out.

What are you seeing for temps? Normally the Yaris will sit in the low to mid 180's F when cruising.

I'll take my toy (The Yaris) for a drive tonight and pay attention to both the color of the light (when the car starts) and the water temp (in deg F)

Will

[Kaotic Lazagna]

Originally Posted by 3cyltrbo

I'll take my toy (The Yaris) for a drive tonight and pay attention to both the color of the light (when the car starts) and the water temp (in deg F)

Will

For my car on the freeway, my coolant runs between 179-184*. City driving goes from 180-190's. Parking lot goes up to 202, or around there where the fan kicks in. lol

[Bluevitz-rs]

Originally Posted by Kaotic Lazagna

For my car on the freeway, my coolant runs between 179-184*. City driving goes from 180-190's. Parking lot goes up to 202, or around there where the fan kicks in. lol

x2

[3cyltrbo]

Originally Posted by CTScott

OK. On the Canadian clusters it must be different. On the US ones we have a little green indicator. Mine takes about 1/2 mile from my house to go out.

You were RIGHT (sorry my bad) the light IS GREEN, but at this time of year it is almost never ever on when I first start the car (even after its been sitting for days which is usually the case)

Originally Posted by CTScott

What are you seeing for temps? Normally the Yaris will sit in the low to mid 180's F when cruising.

I drove it briefly yesterday and I was seeing temps in the 140 - 175 range when cruising (outside temperature was approx 91)

[tooter]

Originally Posted by 3cyltrbo

I drove it briefly yesterday and I was seeing temps in the 140 - 175 range when cruising (outside temperature was approx 91)

Those temps are in engine warm up territory so the ECU will still be supplying a rich fuel mix. I'm not certain, but there's a chance that the timing parameters during the warm up cycle might also be different.

Be sure to let me know what happens, because if you're not satisfied, you get your money back.

Greg

[CTScott]

Originally Posted by tooter

Those temps are in engine warm up territory so the ECU will still be supplying a rich fuel mix. I'm not certain, but there's a chance that the timing parameters during the warm up cycle might also be different.

Be sure to let me know what happens, because if you're not satisfied, you get your money back.

Greg

167F to 212F is considered normal (post warm-up) operating temperature to the ECM. Below that is the "cold start mode"

Once the engine gets past the cold start range, the coolant temperature is still used for camshaft timing control:

"Camshaft timing control is performed according to engine operating conditions such as the intake air volume, throttle valve position and engine coolant temperature."

So, I still think that Jason's take on the performance thermostat being the culprit has merit.