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Old 03-15-2006, 10:11 PM   #31
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Toyota Engine Protection

I rented a Toyota Matrix (Pontiac Vibe) on a few occasions and found that from a cold start, under heavy throttle, the ECU won't let the RPMs go higher than around 3000 RPM until the coolant temp is high enough -- perhaps an engine saving or emissions feature. I think the ECU is pretty complicated and un-traditional and may apply to the Scion line (similar engine probably). Maybe the computer doesn't react to closed throttle as expected.

I need to get a ScanGuage...injection pulsation is good info to have.

RH77
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Old 03-16-2006, 03:23 AM   #32
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not official

Not official just a guess - any way you could check the exhost for fuel use - oxy sensor feedback? to see if gas is being injected?? Heat rise of a cold engine may idicate something also. Fuel pump current?

Just thought of another test - climbing hills - going fast and going slow should yield the same mpg unless the engine has a sweet spot. Maybe a great way to test power levels without going too fast to eliminate air drag factors. Going up hill with a cold engine really gets the engine temp up quickly - keep rpm low to increase heat absorbsion inside the cylinders.

Coasting in/out of gear - if you have to time a light then slowing down sooner will preserve more speed when getting to the light green. Also stopping on a down hill with a light - better to stop higher up on the hill if you can and use the hill to speed up when the light turns green. Stop signs don't work with this technique.
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Old 03-16-2006, 05:15 AM   #33
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Re: Toyota Engine Protection

Quote:
Originally Posted by rh77
I need to get a ScanGuage...injection pulsation is good info to have.
it actually doesn't show that directly (though it must USE that info for the instant/avg MPG calcs). it doesn't show fuel trim either.
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Old 03-16-2006, 07:56 AM   #34
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Re: Toyota Engine Protection

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it actually doesn't show that directly (though it must USE that info for the instant/avg MPG calcs). it doesn't show fuel trim either.
I wonder if it's possible to get a "Y" OBD-II splitter, so I can use my data logger to get fuel trim, etc. and plug the ScanGuage into the other port.

RH77
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Old 03-16-2006, 08:11 AM   #35
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Re: Toyota Engine Protection

Quote:
Originally Posted by rh77
Quote:
Originally Posted by MetroMPG
it actually doesn't show that directly (though it must USE that info for the instant/avg MPG calcs). it doesn't show fuel trim either.
I wonder if it's possible to get a "Y" OBD-II splitter, so I can use my data logger to get fuel trim, etc. and plug the ScanGuage into the other port.

RH77
I bet that you could make one really easily. I also bet that you could contact the guys at www.rywire.com to get one made for you.
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Old 03-16-2006, 08:33 AM   #36
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Quote:I rented a Toyota

Quote:
I rented a Toyota Matrix (Pontiac Vibe) on a few occasions and found that from a cold start, under heavy throttle, the ECU won't let the RPMs go higher than around 3000 RPM until the coolant temp is high enough -- perhaps an engine saving or emissions feature. I think the ECU is pretty complicated and un-traditional and may apply to the Scion line (similar engine probably). Maybe the computer doesn't react to closed throttle as expected.
Similarly, my friend's 01 civic sets a rev limit based on certain factors. For example, I can't rev it up in park, or with the brake on, so there's no possibility to peeling out unless I neutral bomb the thing, but I'd feel bad doing that to someone else cars,
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