Intermittent misfire cyl 1 07 Yaris 1.5 sedan - Toyota Yaris Forums

Toolaholic · 08-04-2019, 11:16 AM

Hi all, I have replaced plugs ,coils, pvc valve, O2 sensor MAF sensor plus Techron fuel cleaner. Sprayed intake with carb cleaner no change in idle. It’s intermittent. Daughter drove it 50 miles and I got a a misfire reading of 334. And yes I know it’s a algorithm. I replaced plug and swapped a coil in. I drove it hard 3 times and got 69,77 and wait for it 1. I will post pics of changing a plug out in another thread.

Toolaholic · 08-04-2019, 12:22 PM

It idles smooth with air off. So smooth the steering wheel doesn’t vibrate at all .

Toolaholic · 08-04-2019, 07:15 PM

Daughter got back after 50 mile trip home. Cylinder 1 had reading of 1. I got it to 100 twice to get to the 6,000 rpm full throttle shift from 2nd to 3rd. Reading was 2 on cylinder 1. Now at some time later in the week she’ll come home and it will read 80 or something high like that. Unless the Techron works and it’s fixed. Makes no sense sometimes you flog it and get a 1. Sometimes a 69 or 77. It can take being run hard every now and again . Mobil 1 5w30 and amsoil in transmission plus cooling system serviced twice. Well taken care of.

Toolaholic · 08-05-2019, 07:51 AM

She taking it on a 100 mile trip to the beach then 100 back . Fingers crossed. Hoping the Techron fixed it and it was a plugged injector.

Toolaholic · 08-11-2019, 09:50 AM

It’s at martins auto center. They do outstanding work. Replaced intake manifold gasket. Still no improvement. It drives great for 20 minutes then misfires and flashes engine light on clylinder 1. Pull over for 5-10 minted and it runs great again for 20 minutes

Toolaholic · 08-12-2019, 02:57 PM

Garage called fuel injector

Brighton · 08-12-2019, 03:37 PM

If it's fuel injectors, you could try BG44K cleaner, if it's a matter of them being clogged/sticky that will help.

Toolaholic · 08-12-2019, 08:19 PM

Quote:

Originally Posted by Brighton

If it's fuel injectors, you could try BG44K cleaner, if it's a matter of them being clogged/sticky that will help.

used Techron 3 times. It runs awesome for 30 minutes at a time then misfires heavily . Runs great again after 5 minute break. They tested injector said it tested bad. I’m assuming with a multi meter. I should of tested it but assumed it ran too good to be injector . I thought it was electrical problem somewhere. $350 labor / parts . I could of did it myself but it was $100 to diagnose it. So $250 more to fix. Oh well I put everything else on.

Brighton · 08-12-2019, 10:02 PM

Sometimes it's worth it to just get a fresh set of eyes on a problem. I'd see if you could swap the injector to another location and see if the misfire CEL changes cylinders.

thebarber · 08-15-2019, 03:32 PM

swap the injectors between cyl 1 and 2 and coil from 1 to 3 and see if the issue moves.

Toolaholic · 08-15-2019, 09:47 PM

$284. $144 labor and $124.95 for injector. It was the injector on cylinder 1. Got a denso injector for $45 (eBay) and a fel pro cylinder head cover gasket set for $9 ( amazon) to have in hand should this happen again.

thebarber · 08-16-2019, 11:55 AM

Glad you found the issue

mirageman · 08-25-2019, 07:29 PM

With all resepect, I'm not trying to be an ash hole, but I have no idea what algorithm you are referring to in the original post. I am sure most people here don't know, either. Can you explain what a misfire reading of 334 means? 69,77 and 1? I'm no ASE certified tech, but I feel like I just walked into a different country! Hehe...

08-04-2019, 11:16 AM	#1
Toolaholic Drives: Olive yaris,FRS, Dakota R/T Join Date: Aug 2013 Location: Pa Posts: 147	Intermittent misfire cyl 1 07 Yaris 1.5 sedan Hi all, I have replaced plugs ,coils, pvc valve, O2 sensor MAF sensor plus Techron fuel cleaner. Sprayed intake with carb cleaner no change in idle. It’s intermittent. Daughter drove it 50 miles and I got a a misfire reading of 334. And yes I know it’s a algorithm. I replaced plug and swapped a coil in. I drove it hard 3 times and got 69,77 and wait for it 1. I will post pics of changing a plug out in another thread.

08-15-2019, 03:32 PM	#10
thebarber daily driver View User's Garage Drives: the #wrecho Join Date: Jun 2006 Location: Grand Rapids, MI Posts: 5,877	swap the injectors between cyl 1 and 2 and coil from 1 to 3 and see if the issue moves. __________________

08-16-2019, 11:55 AM	#12
thebarber daily driver View User's Garage Drives: the #wrecho Join Date: Jun 2006 Location: Grand Rapids, MI Posts: 5,877	Glad you found the issue __________________

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
NEWS: TOYOTA REVEALS ALL-NEW YARIS SEDAN AT 2006 LOS ANGELES AUTO SHOW	VitzBoy	General Yaris / Vitz Discussion	7	09-20-2023 07:50 AM
06-10 Yaris Sedan cold air intake $40	kylevh21	Items for Sale by private party	2	04-01-2012 02:14 PM
Consumer Reports Is On Crack!!!	doublewam	General Yaris / Vitz Discussion	82	05-07-2011 11:03 AM
2007 Yaris Pricing Info !	YarisBueller	New YARIS Purchase Forum	104	06-24-2009 04:54 PM
yaris Advance Sedan	Rudeshady	Central and South America	14	06-25-2007 01:50 AM

08-04-2019, 12:22 PM	#2
Toolaholic Drives: Olive yaris,FRS, Dakota R/T Join Date: Aug 2013 Location: Pa Posts: 147	It idles smooth with air off. So smooth the steering wheel doesn’t vibrate at all .

08-04-2019, 07:15 PM	#3
Toolaholic Drives: Olive yaris,FRS, Dakota R/T Join Date: Aug 2013 Location: Pa Posts: 147	Daughter got back after 50 mile trip home. Cylinder 1 had reading of 1. I got it to 100 twice to get to the 6,000 rpm full throttle shift from 2nd to 3rd. Reading was 2 on cylinder 1. Now at some time later in the week she’ll come home and it will read 80 or something high like that. Unless the Techron works and it’s fixed. Makes no sense sometimes you flog it and get a 1. Sometimes a 69 or 77. It can take being run hard every now and again . Mobil 1 5w30 and amsoil in transmission plus cooling system serviced twice. Well taken care of.

08-05-2019, 07:51 AM	#4
Toolaholic Drives: Olive yaris,FRS, Dakota R/T Join Date: Aug 2013 Location: Pa Posts: 147	She taking it on a 100 mile trip to the beach then 100 back . Fingers crossed. Hoping the Techron fixed it and it was a plugged injector.

08-11-2019, 09:50 AM	#5
Toolaholic Drives: Olive yaris,FRS, Dakota R/T Join Date: Aug 2013 Location: Pa Posts: 147	It’s at martins auto center. They do outstanding work. Replaced intake manifold gasket. Still no improvement. It drives great for 20 minutes then misfires and flashes engine light on clylinder 1. Pull over for 5-10 minted and it runs great again for 20 minutes

08-12-2019, 02:57 PM	#6
Toolaholic Drives: Olive yaris,FRS, Dakota R/T Join Date: Aug 2013 Location: Pa Posts: 147	Garage called fuel injector

08-12-2019, 03:37 PM	#7
Brighton Knower of little Drives: None Join Date: Jul 2019 Location: NO Posts: 87	If it's fuel injectors, you could try BG44K cleaner, if it's a matter of them being clogged/sticky that will help.

08-12-2019, 10:02 PM	#9
Brighton Knower of little Drives: None Join Date: Jul 2019 Location: NO Posts: 87	Sometimes it's worth it to just get a fresh set of eyes on a problem. I'd see if you could swap the injector to another location and see if the misfire CEL changes cylinders.

08-15-2019, 09:47 PM	#11
Toolaholic Drives: Olive yaris,FRS, Dakota R/T Join Date: Aug 2013 Location: Pa Posts: 147	$284. $144 labor and $124.95 for injector. It was the injector on cylinder 1. Got a denso injector for $45 (eBay) and a fel pro cylinder head cover gasket set for $9 ( amazon) to have in hand should this happen again.

08-25-2019, 07:29 PM	#13
mirageman Drives: 2009 yaris Join Date: Feb 2016 Location: poughkeepsie ny Posts: 46	With all resepect, I'm not trying to be an ash hole, but I have no idea what algorithm you are referring to in the original post. I am sure most people here don't know, either. Can you explain what a misfire reading of 334 means? 69,77 and 1? I'm no ASE certified tech, but I feel like I just walked into a different country! Hehe...