HELP! I think my yaris is dying *VID inside*

[Mr.Tmosh]

Hey guys I'm new here.

I have a 2007 Yaris sedan and I thing It might be dying. Idle is very erratic and it drops to 300 or something like that.
I've tried everything:

Changed Sparkplugs
Cleaned the throttle body MAF and IAC valve
New ignition coils
Checked Alternator
Couldn't find Vacuum leaks
Motor mounts are still OK


But the idle is still rough after a while, and it makes it undriveable under heavy traffic.
The engine shakes violently and that's why I think it might be dying.

See, here is a video:
http://www.youtube.com/watch?v=R2S8mYL4p-k


Sorry for the quality but my cell phone is crap.

Any ideas of what could be the cause?:iono:
I don't know what else to do. Please help me. :cry:


:help:

[Betrivent]

First of all.. that;'s an awful video for diagnosing.. has it ever thrown any CEls?

[A-Dingo-Ate-My-Baby]

clean your MAF

I bet it starts to run mint again

EDIT: give me the dunce cap

[Betrivent]

Hey guys I'm new here.

I have a 2007 Yaris sedan and I thing It might be dying. Idle is very erratic and it drops to 300 or something like that.
I've tried everything:

Changed Sparkplugs
Cleaned the throttle body MAF and IAC valve
New ignition coils
Checked Alternator
Couldn't find Vacuum leaks
Motor mounts are still OK


But the idle is still rough after a while, and it makes it undriveable under heavy traffic.
The engine shakes violently and that's why I think it might be dying.

See, here is a video:
http://www.youtube.com/watch?v=R2S8mYL4p-k


Sorry for the quality but my cell phone is crap.

Any ideas of what could be the cause?:iono:
I don't know what else to do. Please help me. :cry:


:help:

:wink:

[Mr.Tmosh]

First of all.. that;'s an awful video for diagnosing.. has it ever thrown any CEls?

Nope :iono: The engine even shuts off and It doesn't throw a Check Engine light.

I even scanned the car to see if there was an error, but nothing...

I' ll upload a better video next time :redface:

[Betrivent]

Does it do this in neutral?

[Mr.Tmosh]

Does it do this in neutral?

Yes, it has manual transmission.
Thanks for the reply :thumbsup:

[A-Dingo-Ate-My-Baby]

reading is not my strong suit today

[Betrivent]

I wonder if it's something belt driven that's failing and sapping all the power?

[Mr.Tmosh]

I wonder if it's something belt driven that's failing and sapping all the power?

Hmmm interesting, didn't think about that, I'm going to check. Thanks :thumbsup:

[Betrivent]

Just brainstormin :D

[Lil Abner]

Some more brainstorming ideas:

- Did you check the air filter?
- Does it seem like you have enough exhaust gases coming out the tail pipe? So someone didn't shove something, like a potato, in there?
- Ever have issues with water in your gas? It wouldn't hurt to get a fuel additive to clean the fuel injectors that ALSO takes care of possible water in the gas. I'd do this as it is a benefit across the board.
- Maybe try cleaning the MAFS again? Double check the o-ring around the MAFS is flexible, and there are no leaks around it?
- Check the grounds on the motor? Make sure you don't have a bad ground somewhere?
- Clean the terminals on the battery with a wire brush.
- Does the engine run rough even when you keep the clutch pedal pushed in? It's a long-shot..

That's all I got right now. With no codes, it could be so many different things. Check the things above, and hopefully something fixes it.

[Stove]

Does it run normally and seem to have normal power when you are driving and it only does it at idle? Or does it seem to be underpowered all the time?

[Bluevitz-rs]

Does it run normally and seem to have normal power when you are driving and it only does it at idle? Or does it seem to be underpowered all the time?

X2

[goliath1812]

make sure vacuum hoses are hooked up. this is what happened to mine after i was messing around under the hood, and forgot to hook up the pcv valve hose back up.

[Mr.Tmosh]

Does it run normally and seem to have normal power when you are driving and it only does it at idle? Or does it seem to be underpowered all the time?

Hello, thanks for your reply.

It's normal most of the time. It doesn't seem underpowered. While idling, the revs keep between 1000 and 500, suddenly they drop to 400 ~ 300 and that's the problem, even if I press the gas pedal it's hard to get them up.

[Mr.Tmosh]

make sure vacuum hoses are hooked up. this is what happened to mine after i was messing around under the hood, and forgot to hook up the pcv valve hose back up.

Checked it and it seems fine :iono:

:thumbsup:

[Mr.Tmosh]

Some more brainstorming ideas:

- Did you check the air filter? New
- Does it seem like you have enough exhaust gases coming out the tail pipe? I think so So someone didn't shove something, like a potato, in there? No lol
- Ever have issues with water in your gas? It wouldn't hurt to get a fuel additive to clean the fuel injectors that ALSO takes care of possible water in the gas. I'd do this as it is a benefit across the board. :iono:
- Maybe try cleaning the MAFS again? Double check the o-ring around the MAFS is flexible, and there are no leaks around it? thanks,I'll check again
- Check the grounds on the motor? Make sure you don't have a bad ground somewhere? Checking
- Clean the terminals on the battery with a wire brush. The battery terminals are clean
- Does the engine run rough even when you keep the clutch pedal pushed in? Yes :(
It's a long-shot..

That's all I got right now. With no codes, it could be so many different things. Check the things above, and hopefully something fixes it.


:thumbsup:

Thanks

[Stove]

My money is on a bad TPS (throttle position sensor), but thats a bit of a shot in the dark with the limited info.

[Vinceb]

O2 sensors on the exhaust, but they should throw a code.
I agree with Stove, TPS
Ground loop from some added after market components (stereo, Amp, Cap, alarm, remote start).
Have you kept up with maintenance ? oil changes ?

You said you changed the coil and the plugs - so they're properly gaped ? it's not one of those wierd BOSCH 4 tip things is it ? what brand did you put in ?
did you test or change the plug wires ? could be a faulty wire but again, should set a misfire code.

Fuel filter clogged ? - how many miles or KM are on the car ?
Is there a fuel rail pressure regulator on the Yaris ? - I've replaced this on a cavalier before.
loose wires connected to the ECM in the engine, or is the ECM damaged.
You could try disconnecting the battery and leaving the car to sit for a few hours, then reconnect and drive around for a bit, that will reset the computer, and it's worth a try.

Keep us posted.

[Mr.Tmosh]

O2 sensors on the exhaust, but they should throw a code.
I agree with Stove, TPS
Ground loop from some added after market components (stereo, Amp, Cap, alarm, remote start).
Have you kept up with maintenance ? oil changes ?

You said you changed the coil and the plugs - so they're properly gaped ? it's not one of those wierd BOSCH 4 tip things is it ? what brand did you put in ?
did you test or change the plug wires ? could be a faulty wire but again, should set a misfire code.

Fuel filter clogged ? - how many miles or KM are on the car ?
Is there a fuel rail pressure regulator on the Yaris ? - I've replaced this on a cavalier before.
loose wires connected to the ECM in the engine, or is the ECM damaged.
You could try disconnecting the battery and leaving the car to sit for a few hours, then reconnect and drive around for a bit, that will reset the computer, and it's worth a try.

Keep us posted.



Hello guys, I´m taking the car to the shop this weekend to check everything you´ve said. Grounds, TPS, fuel filter, etc.

The car is 57,xxx KM, the plugs I used are Autolite platinum , I already disconnected the battery to reset the computer, when on "RELEARN" mode I noticed that the revs went up to 3 or a bit higher , and would stay there for about 20 minutes droping and climbing like crazy. Later the car was normal.

Idling the car, revs stay between 1000 and 500 but after 5~7 min the revs drop almost instantly and that´s when the rattling and shaking begins. Even if I press on the gas pedal it struggles to climb the revs.

OK thanks guys, I´ll keep you posted.

:thumbsup:

[Betrivent]

before anybody says anything, I run Bosch Platinum plugs and I've got no problems.

Sounds liek an electrical sensor issue for sure.. mechanically it's obviously running fine

[Ratz]

Let as know what the culprit is.
*

[Astroman]

Mine was acting weird and shutting off in park (got the slushbox) and it was some wires coming over the intake maniforld were crushed and corroded, and the back of my alternator was crushed (had been hit, body shop missed these things and I discovered them a year later when problems started).

Also check the throttle body... Idle screw might have come loose (even though it should be locked in there with epoxy.

Hope the shop helps you, please keep us posted!

[Black_griffin6]

Question...did you recently get a new battery, do any kind of maintenance, or change any kind of part prior to this happening?

My mum has a 2002 4cyl Camry and the same thing was happening to her car after she got a new battery. The RPM's slowly dropped until the car eventually would stall.
As soon as she put the old battery back in, it was fine.

The solution? Leave the new battery in and drive the hell out of it until the engine's computer realizes it has a new battery.

[sm2by]

I had this problem too.
After Cleaning the MAF Sensor and Throttle body didn't fix the rough idle and stalling.
I didn't get any CELs and had the car scanned for trouble codes; none were found.
The techs just swapped my O2 sensor from another sedan and just test drove it for a day, no rough idle or stalling happened.
So I got the O2 sensor replaced under warranty. (Mine was an '08 sedan M/T)