My problem with my car; help(gas econ) - Page 2 - Toyota Yaris Forums

Violin · 11-09-2006, 06:36 AM

When I asked at the dealership about the disappointing fuel economy on my car (30 mpg average since it was new), they said that if the check engine light hadn't come on, everything was operating normally. Is it possible that there are error codes that would not trigger that light?

I'm taking my car back to them for the 15,000 service soon. I'll probably ask them to check for codes and reset the ECU to see if that helps.

Lafiro · 11-09-2006, 07:30 AM

Quote:

Originally Posted by Violin

When I asked at the dealership about the disappointing fuel economy on my car (30 mpg average since it was new), they said that if the check engine light hadn't come on, everything was operating normally. Is it possible that there are error codes that would not trigger that light?

I'm taking my car back to them for the 15,000 service soon. I'll probably ask them to check for codes and reset the ECU to see if that helps.

Second that :(

Well it dropped to 30mpg from 32-36 after changing the rims and adding two 12" subs and an amp inside the trunk with dynomat.

Mine is at around 12000 as of right now.

ECHOKnight2000 · 11-09-2006, 01:34 PM

Quote:

Originally Posted by Lafiro

Well it dropped to 30mpg from 32-36 after changing the rims and adding two 12" subs and an amp inside the trunk with dynomat.

Not to burst your bubble but I guessing that has a huge contribution to the decrease in mpg. First bigger tires and different sizes other than stock can effect mileage maybe not as much if you went from 14" to 15" but if you have 17" or 18"s certainly. Also dynomat weighs the car down, okay if its just in one spot maybe not significantly but it adds up, 2-12" subs? Yep that's going to cost in some fuel decreasing, cause your lugging some extra weight...I'm not saying get rid of them just a heads up, its your car, do what ever you want!

Lafiro · 11-09-2006, 10:54 PM

Yup. And the subs/box's weigh a good amount, and no the diam. is pretty close, not off by more then 1-3%. And they are 205/40/17. And the entire trunk is dynomat'd.

Ok everyone, got the tank to flash on me and filled the car up with 93.

Went to the dealership this afternoon, and the master tech basically checked it all out and noticed the problem and another one aswell(starting up wierdly)

Well, he checked the ECU and nothing came up, so he took the fuel line and took out 3 cups worth of fuel and lets say that it had a light brown color to the fule, and smelled like shit. Well like all gasoline does, except it was a little different. The tech said it looked/smelled like diesel. He said that was the problem, bad gas. Never to go to BP for fuel again and to just fill the car with 93 and drive it till it runs out almost and then go back to 87. This way whatever is in there gets mixed up witht he 93 and then let the extra heat created from it to burn whatever it left behind in the engine.

I will let everyone know how it drives after tomorrow, when the new gas should get to the engine.(since I only drove 1 mile from the station to the house)

eTiMaGo · 11-10-2006, 04:49 AM

Hmmm I'm afraid I may have a similar problem happening...

When my car was at the garage for the second round of mods, they often kept the engine running, and it did run out of gas. They refilled to about a half tank, but since then I have not driven very often or a long distance, maybe 100km max, and the tank's almost empty...

Gonna go for a refill later today and see how this turns out...

07WYarisRS · 11-10-2006, 09:07 AM

Why would you run 93 octane?
That will just make things worse if you already have a problem with fuel.

A deisel pump nozel will not fit into your cars Gasoline tank opening. Deisel nozzels are larger to eliminate accidental fill ups.

If it was deisel your fuel would be bright red, not brown.

stuffy · 11-10-2006, 09:34 AM

Quote:

Why would you run 93 octane?
That will just make things worse if you already have a problem with fuel.

A deisel pump nozel will not fit into your cars Gasoline tank opening. Deisel nozzels are larger to eliminate accidental fill ups.

If it was deisel your fuel would be bright red, not brown

i think he was saying that the gas that he put in his car was mixed diesel/petrol from the pump that it came out of.

07WYarisRS · 11-10-2006, 09:52 AM

Still diesel is dark red, and if it was a mix of gasline and deisel it would be pink or bright red not brown

Lafiro · 11-11-2006, 01:12 AM

Ok, well it wasnt tested or anything ok? I was just told it looked/smelled funny. Either way he said he needs to make sure this tank gets 93 so it burns hotter I guess? So it burns out whatever it left there. Then to get back to 87, drive and if its not normal, take it back again.

Pars · 11-11-2006, 04:32 AM

I only gas up at those stations that are always busy, usually located off a busy intersection. Sometimes, the wait is annoying, but worthwhile since less chance of putting contaminated fuel into my car. Also, I've heard that it's best not to fuel up while the fuel-truck is in the process of loading up the resuvoir...but not sure why.

Violin · 11-11-2006, 08:20 AM

Because the refilling stirs up sediments that have settled to the bottom of the tanks. The newer systems are pretty well filtered now so I would think that's less of a concern these days.

Snake · 11-11-2006, 12:31 PM

unplug the negative terminal on your battery
go in the car push your break three times
reconnect the battery
and pour in a bottle of silver STP complete fuel system cleaner with your next gas fill up
this should solve all your problems
by the way do not run 93 in this car, your computer is not meant to use it unless your running an aftermarket turbo system at that time you should have a piggy back with advanced timing for 93 octane

swng · 11-11-2006, 02:02 PM

Forgive my ignorance, but should'nt the ECU show up a code as and when it notices that unsuitable fuel is being used ?

Lafiro · 11-11-2006, 05:13 PM

Quote:

Originally Posted by swng

Forgive my ignorance, but should'nt the ECU show up a code as and when it notices that unsuitable fuel is being used ?

Not sure, actually he didnt tell me anything about any codes. He just told me nothing was wrong with the ECU.

Snake · 11-11-2006, 10:08 PM

no a code will not be thrown with poor gas in the tank
the car will just run like crap and clog up your fuel system
it will throw a code with a bad fuel pump

swng · 11-12-2006, 01:02 AM

Quote:

Originally Posted by Snake

no a code will not be thrown with poor gas in the tank
the car will just run like crap and clog up your fuel system
it will throw a code with a bad fuel pump

In other words, bad fuel per se may not cause the ECU to show a code, but when the use of bad fuel finally causes damages to the fuel system or, I presume, the engine or any other important part of the car, a code may be shown.
Thank you for enlightening

!

To Lafiro - Best wishes for an early solution!

Lafiro · 11-12-2006, 11:04 AM

Thank you swng. I really hope this tank resolves anything that might have happened. As of right now, its still using a lot of fuel. I cant say how much, as I didnt reset the odo. until I was like 20-30miles into the tank. But for now I will keep on driving and hope for the best.

Snake · 11-12-2006, 11:06 AM

dont forget the fuel system cleaner otherwise the resetting the engine wont do anything for u

11-10-2006, 04:49 AM	#23
eTiMaGo vroom vroom View User's Garage Drives: lil red 5-door Join Date: Sep 2006 Location: Bangkok, Thailand Posts: 7,744	Hmmm I'm afraid I may have a similar problem happening... When my car was at the garage for the second round of mods, they often kept the engine running, and it did run out of gas. They refilled to about a half tank, but since then I have not driven very often or a long distance, maybe 100km max, and the tank's almost empty... Gonna go for a refill later today and see how this turns out... __________________ The price of freedom of religion, or of speech, or of the press, is that we must put up with a good deal of rubbish. - Robert Jackson Bye bye 1NZ...

11-10-2006, 09:07 AM	#24
07WYarisRS HardlyDangerous Drives: 09 Yaris LE, H/B, auto Join Date: Jul 2006 Location: Ridgeway Ontario Posts: 573	Why would you run 93 octane? That will just make things worse if you already have a problem with fuel. A deisel pump nozel will not fit into your cars Gasoline tank opening. Deisel nozzels are larger to eliminate accidental fill ups. If it was deisel your fuel would be bright red, not brown. __________________ The early bird gets the worm, but the second mouse gets the cheese.

11-10-2006, 09:52 AM	#26
07WYarisRS HardlyDangerous Drives: 09 Yaris LE, H/B, auto Join Date: Jul 2006 Location: Ridgeway Ontario Posts: 573	Still diesel is dark red, and if it was a mix of gasline and deisel it would be pink or bright red not brown __________________ The early bird gets the worm, but the second mouse gets the cheese.

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11-09-2006, 06:36 AM	#19
Violin View User's Garage Drives: 2007 Yaris LB Auto Join Date: Jul 2006 Location: New Jersey Posts: 1,592	When I asked at the dealership about the disappointing fuel economy on my car (30 mpg average since it was new), they said that if the check engine light hadn't come on, everything was operating normally. Is it possible that there are error codes that would not trigger that light? I'm taking my car back to them for the 15,000 service soon. I'll probably ask them to check for codes and reset the ECU to see if that helps.

11-09-2006, 10:54 PM	#22
Lafiro Drives: 06 Yaris Sedan Join Date: Jun 2006 Location: NYC Posts: 694	Yup. And the subs/box's weigh a good amount, and no the diam. is pretty close, not off by more then 1-3%. And they are 205/40/17. And the entire trunk is dynomat'd. Ok everyone, got the tank to flash on me and filled the car up with 93. Went to the dealership this afternoon, and the master tech basically checked it all out and noticed the problem and another one aswell(starting up wierdly) Well, he checked the ECU and nothing came up, so he took the fuel line and took out 3 cups worth of fuel and lets say that it had a light brown color to the fule, and smelled like shit. Well like all gasoline does, except it was a little different. The tech said it looked/smelled like diesel. He said that was the problem, bad gas. Never to go to BP for fuel again and to just fill the car with 93 and drive it till it runs out almost and then go back to 87. This way whatever is in there gets mixed up witht he 93 and then let the extra heat created from it to burn whatever it left behind in the engine. I will let everyone know how it drives after tomorrow, when the new gas should get to the engine.(since I only drove 1 mile from the station to the house)

11-11-2006, 01:12 AM	#27
Lafiro Drives: 06 Yaris Sedan Join Date: Jun 2006 Location: NYC Posts: 694	Ok, well it wasnt tested or anything ok? I was just told it looked/smelled funny. Either way he said he needs to make sure this tank gets 93 so it burns hotter I guess? So it burns out whatever it left there. Then to get back to 87, drive and if its not normal, take it back again.

11-11-2006, 04:32 AM	#28
Pars Drives: 07 Yaris Liftback Join Date: Aug 2006 Location: Toronto Posts: 418	I only gas up at those stations that are always busy, usually located off a busy intersection. Sometimes, the wait is annoying, but worthwhile since less chance of putting contaminated fuel into my car. Also, I've heard that it's best not to fuel up while the fuel-truck is in the process of loading up the resuvoir...but not sure why.

11-11-2006, 08:20 AM	#29
Violin View User's Garage Drives: 2007 Yaris LB Auto Join Date: Jul 2006 Location: New Jersey Posts: 1,592	Because the refilling stirs up sediments that have settled to the bottom of the tanks. The newer systems are pretty well filtered now so I would think that's less of a concern these days.

11-11-2006, 12:31 PM	#30
Snake Drives: 2007 Yaris Liftback Join Date: Mar 2006 Location: New York Posts: 127	unplug the negative terminal on your battery go in the car push your break three times reconnect the battery and pour in a bottle of silver STP complete fuel system cleaner with your next gas fill up this should solve all your problems by the way do not run 93 in this car, your computer is not meant to use it unless your running an aftermarket turbo system at that time you should have a piggy back with advanced timing for 93 octane

11-11-2006, 02:02 PM	#31
swng Drives: 06 3-dr auto RS Join Date: Jan 2006 Location: BC Posts: 1,051	Forgive my ignorance, but should'nt the ECU show up a code as and when it notices that unsuitable fuel is being used ?

11-11-2006, 10:08 PM	#33
Snake Drives: 2007 Yaris Liftback Join Date: Mar 2006 Location: New York Posts: 127	no a code will not be thrown with poor gas in the tank the car will just run like crap and clog up your fuel system it will throw a code with a bad fuel pump

11-12-2006, 11:04 AM	#35
Lafiro Drives: 06 Yaris Sedan Join Date: Jun 2006 Location: NYC Posts: 694	Thank you swng. I really hope this tank resolves anything that might have happened. As of right now, its still using a lot of fuel. I cant say how much, as I didnt reset the odo. until I was like 20-30miles into the tank. But for now I will keep on driving and hope for the best.

11-12-2006, 11:06 AM	#36
Snake Drives: 2007 Yaris Liftback Join Date: Mar 2006 Location: New York Posts: 127	dont forget the fuel system cleaner otherwise the resetting the engine wont do anything for u