Idle Fluctuation due to aftermarket intake? - Page 2 - Toyota Yaris Forums

Galavoxx · 12-22-2006, 12:31 PM

Quote:

Originally Posted by El Jefe

the problem the original poster is having is the a/c compressor kicking on and off, it seems like the computer is over/under compensating for the load change. i've noticed this on mine

the only way to fix this will be a reflash of the ecu to smooth the change out. toyota has no released this as yet and i highly doubt they will. it may be annoying but it causes no ill effect to the car as long as it's not stalling out or anything like that.

But I live in San Francisco, I've never even used the a/c. I'm just satisfied knowing that this is a problem with more than just my car. I do agree with you though, I doubt Toyota will ever do a recall to fix the problem.

Galavoxx · 12-18-2006, 04:41 PM

I have no idea...

foxtrot685 · 12-21-2006, 10:31 PM

i have a scion xA and it used to do teh same thing when i first got it. im thinking its common with the 1NZ-FE. give it some time and miles and it should go away... mine did

Tamago · 12-22-2006, 07:46 AM

clean your MAF

problem solved

Galavoxx · 12-22-2006, 12:33 PM

Quote:

Originally Posted by Tamago

clean your MAF

problem solved

Are you saying it came from the factory with a dirty MAF? I doubt it. I'll take a look though.

Tamago · 12-22-2006, 05:43 PM

if you've installed an aftermarket intake, the filters come oiled.. oil gets on the MAF and dirt sticks..

it's something to clean when you change your oil

Galavoxx · 12-22-2006, 05:57 PM

I can see how this would be a issue, though I've never had it happen on any other gauze/oil equipped car I've had. In my case however, I got the Weapon Research Foam non-oiled filter. Plus, this problem has occurred with other cars running a stock airbox.

Tamago · 12-22-2006, 05:59 PM

and any of those times did you check to see if the MAF was dirty?

jcove · 12-22-2006, 07:50 PM

Quote:

Originally Posted by Tamago

and any of those times did you check to see if the MAF was dirty?

I don't have an aftermarket intake, and my car has done this from day one. It's not the MAF. I don't think it's the A/C compressor either, as I can't remember when my car didn't do this and I don't use defrost or the A/C 100% of the time. I think someone else stated this is something common to the 1NZ engine. It's not a problem as I have mine serviced at the dealer all the time. I've talked to them about a few things of interest, this included and I was told this was nothing to worry about and it's not a problem.

Galavoxx · 12-22-2006, 07:53 PM

Good to know.

skc · 12-23-2006, 03:54 AM

i have exact same problem. glad i'm not the only one.
at idle (when engine is warm) rpm drops to around 500 rpm from 700~1000 rpm.
I'm thinking it might be the header that cause this Idle Fluctuation (not 100% sure) due to change in oxygen content in the exhaust gases.
o2 sensor monitors the amount of oxygen in the engine's exhaust gas and send feedback to ECU if the car is running rich or lean.
i might be wrong but idle fluctuation started after installing MR header & gounding kit.
does anyone else with MR header have this problem?

FlintS · 12-26-2006, 09:43 AM

It is due to the low idle on these cars. Toyota figured if they lower the idle, then we will save more gas. When a fan engages the idle will spudder and change. Nothing to be worried about. I am sure in about four years we will all have to move up our idle....

jcove · 12-26-2006, 11:33 AM

Quote:

Originally Posted by FlintS

It is due to the low idle on these cars. Toyota figured if they lower the idle, then we will save more gas. When a fan engages the idle will spudder and change. Nothing to be worried about. I am sure in about four years we will all have to move up our idle....

That's what one of the techs at the garage told me as well. Finally I remembered what he said. It was just a little while after I got the car so I couldn't remember what he said, just that it wasn't a problem. Thanks, that's been bugging me that I couldn't remember it!

Slummy · 12-28-2006, 02:56 PM

i just has my 1st service, and mentioned this issue, the tech said everything was "with in spec". idle was around 600.

FlintS · 12-29-2006, 06:46 PM

If you want it stop then move up your idle to about 750 or so. That way it only drops to 600 when the fan engages. You will lose slight fuel mileage though...

Captain Slow · 12-08-2011, 10:29 AM

I hate to bring up a super old topic, but I noticed this on the way to work this morning. First time it's ever done this, of course it's also the first time I've driven the car in sub-40 degree temperatures.

hoping it's only because it was so cold outside. it's pretty annoying to have your new car's idle dip and momentarily feel the engine shake and sputter.

if it doesn't stop I'll clean the MAF and report back here. if that still doesn't fix it I'll dig a little further into the problem and see if there is truly a solution other than raising your idle.

cali yaris · 12-08-2011, 01:43 PM

It's called rev hunting. Mine did that from day 1. It doesn't affect the car at all.

Captain Slow · 12-08-2011, 01:48 PM

except that it's annoying on a nice new(ish) car.

I took it out for lunch and noticed it doing the same thing, but this time it didn't get really low and vibrate the cabin. must have been the really cold weather this morning.

12-08-2011, 10:29 AM	#16
Captain Slow My Face Is Ridiculous View User's Garage Drives: 2010 Toyota Yaris 3dr LB Join Date: Dec 2011 Location: Scott, LA Posts: 456	I hate to bring up a super old topic, but I noticed this on the way to work this morning. First time it's ever done this, of course it's also the first time I've driven the car in sub-40 degree temperatures. hoping it's only because it was so cold outside. it's pretty annoying to have your new car's idle dip and momentarily feel the engine shake and sputter. if it doesn't stop I'll clean the MAF and report back here. if that still doesn't fix it I'll dig a little further into the problem and see if there is truly a solution other than raising your idle. __________________ {Buy my book - It Came From Tomorrow}

12-08-2011, 01:43 PM	#17
cali yaris ULTIMATE View User's Garage Drives: 07 Yaris Turbo Join Date: May 2007 Location: Canoga Park, CA Posts: 14,859	It's called rev hunting. Mine did that from day 1. It doesn't affect the car at all. __________________ Micro Image forums, online store and shop are now closed. It was a great eight year run, but it was time to focus on other things. I'm still selling parts on eBay under micro*image seller ID and customers can still make requests for anything specific.

12-08-2011, 01:48 PM	#18
Captain Slow My Face Is Ridiculous View User's Garage Drives: 2010 Toyota Yaris 3dr LB Join Date: Dec 2011 Location: Scott, LA Posts: 456	except that it's annoying on a nice new(ish) car. I took it out for lunch and noticed it doing the same thing, but this time it didn't get really low and vibrate the cabin. must have been the really cold weather this morning. __________________ {Buy my book - It Came From Tomorrow}

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Galavoxx View User's Garage Drives: Yaris Hatch Join Date: Oct 2006 Location: San Francisco Posts: 397	I can see how this would be a issue, though I've never had it happen on any other gauze/oil equipped car I've had. In my case however, I got the Weapon Research Foam non-oiled filter. Plus, this problem has occurred with other cars running a stock airbox.

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Tamago Start another Oil Thread! View User's Garage Drives: ZZW30 Join Date: Dec 2006 Location: South FL Posts: 4,890	and any of those times did you check to see if the MAF was dirty?

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Galavoxx View User's Garage Drives: Yaris Hatch Join Date: Oct 2006 Location: San Francisco Posts: 397	Good to know.

12-23-2006, 03:54 AM	#11
skc View User's Garage Drives: White5drRS Join Date: Oct 2006 Location: Surrey, B.C. Posts: 67	i have exact same problem. glad i'm not the only one. at idle (when engine is warm) rpm drops to around 500 rpm from 700~1000 rpm. I'm thinking it might be the header that cause this Idle Fluctuation (not 100% sure) due to change in oxygen content in the exhaust gases. o2 sensor monitors the amount of oxygen in the engine's exhaust gas and send feedback to ECU if the car is running rich or lean. i might be wrong but idle fluctuation started after installing MR header & gounding kit. does anyone else with MR header have this problem?

12-26-2006, 09:43 AM	#12
FlintS Drives: 2007 Yaris S Sedan Join Date: Jul 2006 Location: Mission Viejo Posts: 60	It is due to the low idle on these cars. Toyota figured if they lower the idle, then we will save more gas. When a fan engages the idle will spudder and change. Nothing to be worried about. I am sure in about four years we will all have to move up our idle....

12-28-2006, 02:56 PM	#14
Slummy View User's Garage Drives: Black LB Join Date: Aug 2006 Location: D.C. Posts: 249	i just has my 1st service, and mentioned this issue, the tech said everything was "with in spec". idle was around 600.

12-29-2006, 06:46 PM	#15
FlintS Drives: 2007 Yaris S Sedan Join Date: Jul 2006 Location: Mission Viejo Posts: 60	If you want it stop then move up your idle to about 750 or so. That way it only drops to 600 when the fan engages. You will lose slight fuel mileage though...