misfire on no 1 cylinder - Toyota Yaris Forums

beemer dave · 05-22-2009, 05:28 AM

Since I bought this 1.0 01 car, the engine management light has been on.
Diagnosed on basic machine as misfire on no 1 cylinder. Checked coil which is fine. New plugs fitted and currently trying injector cleaner in fuel.
Wonder if its a sticky valve. Idle is rough and doesn't pull away cleanly. Its fine and smooth above around 1500 rpm. I'm a bit lost as to what to do next apart from expensive trip to main dealer!

jambo101 · 05-22-2009, 06:35 AM

If its got a check engine light on then it should be throwing a code to the OBD11 computer ,plug in a code reader and see what code is showing up.
not sure how you know its the No.1 cyl giving problems but if you've changed Coil,plug wire and plug it may not be the problem,a bad valve would either show some smoke blowby through the exhaust or oil contamination of the plug or it would be making some kind of noise.

IllusionX · 05-22-2009, 09:11 AM

missfire code can also mean it's not firing at all. Upon a cylinder not working, IDLE will be rough, car will lack power and gas consumption will raise.

that's all i can tell.. i guess..

cleong · 05-22-2009, 10:37 AM

Isn't the 1 litre a 3 cylinder engine? If it is, you're running on two cylinders...

jambo101 · 05-22-2009, 11:39 AM

Quote:

Originally Posted by cleong

Isn't the 1 litre a 3 cylinder engine? If it is, you're running on two cylinders...

Your math is 100% correct

IllusionX · 05-22-2009, 11:52 AM

looks like the 1SZ-FE is a 4cyl engine!

cleong · 05-22-2009, 12:39 PM

Yes you're right, its a 4 cylinder - I got it mixed up with the 1 litre the Toyota Aygo has!

severous01 · 05-22-2009, 10:58 PM

hey, how about checking your valve and lifter lash....it's on the hood. you need a feeler gauge.

TheSilkySmooth · 05-23-2009, 09:30 AM

Do a compression test first. Also, The coil may look OK and have the specified impedance but still be bad due to dielectric breakdown. Luck on this one, mate.

drifto · 05-25-2009, 08:13 PM

map sensor output would be a good place to get a better idea of whats causing a misfire. if only one cyl. is misfiring... fuel psi/ clogged injectors and egr port clogging are unlikely but not impossible, however ignition side issues (coil pack/plug) or vacuum (bent valves) issue could be a more likely cause. there must be a diag troubleshooting chart for misfire on cylinder 1 in the service repair manual. if not check injectors, swap cyl 1 with cyl 2 and see if the misfire switches cylinders as well. do the same with the coil packs and spark plugs. those are some simple quick checks. then try a leakdown test on the misfireing cylinder see if its out of spec. good luck!

05-22-2009, 05:28 AM	#1
beemer dave Drives: 1.0 vvti 2001 Join Date: May 2009 Location: huddersfield Posts: 3	misfire on no 1 cylinder Since I bought this 1.0 01 car, the engine management light has been on. Diagnosed on basic machine as misfire on no 1 cylinder. Checked coil which is fine. New plugs fitted and currently trying injector cleaner in fuel. Wonder if its a sticky valve. Idle is rough and doesn't pull away cleanly. Its fine and smooth above around 1500 rpm. I'm a bit lost as to what to do next apart from expensive trip to main dealer!

05-22-2009, 10:37 AM	#4
cleong Parallel Parking Pro View User's Garage Drives: Yaris 1.5 Manual Join Date: Dec 2006 Location: Singapore Posts: 590	Isn't the 1 litre a 3 cylinder engine? If it is, you're running on two cylinders... __________________ Leong's NCP91 Toyota Yaris E Hankook V12 Evo 195/55/15 on Buddy Club P1 replicas 15x7 ET +38 Stebel horns, Philips Silvervision turn indicator bulbs TTE Lowering Springs, Camber bolts TRD Blue brake pads Fujitsubo Super Wagolis axleback exhaust DC Sports header

05-22-2009, 12:39 PM	#7
cleong Parallel Parking Pro View User's Garage Drives: Yaris 1.5 Manual Join Date: Dec 2006 Location: Singapore Posts: 590	Yes you're right, its a 4 cylinder - I got it mixed up with the 1 litre the Toyota Aygo has! __________________ Leong's NCP91 Toyota Yaris E Hankook V12 Evo 195/55/15 on Buddy Club P1 replicas 15x7 ET +38 Stebel horns, Philips Silvervision turn indicator bulbs TTE Lowering Springs, Camber bolts TRD Blue brake pads Fujitsubo Super Wagolis axleback exhaust DC Sports header

05-25-2009, 08:13 PM	#10
drifto View User's Garage Drives: 07 5spd Yaris LB Join Date: Apr 2007 Location: NY/NJ Posts: 251	map sensor output would be a good place to get a better idea of whats causing a misfire. if only one cyl. is misfiring... fuel psi/ clogged injectors and egr port clogging are unlikely but not impossible, however ignition side issues (coil pack/plug) or vacuum (bent valves) issue could be a more likely cause. there must be a diag troubleshooting chart for misfire on cylinder 1 in the service repair manual. if not check injectors, swap cyl 1 with cyl 2 and see if the misfire switches cylinders as well. do the same with the coil packs and spark plugs. those are some simple quick checks. then try a leakdown test on the misfireing cylinder see if its out of spec. good luck! __________________ Going from drift to grip... 07 Yaris LB 5spd AE86 Corolla GTS 5spd http://microimage.ning.com/ http://www.microimageonline.com/store.html

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05-22-2009, 06:35 AM	#2
jambo101 Drives: yaris 08 sedan Join Date: Oct 2008 Location: Montreal Canada Posts: 1,286	If its got a check engine light on then it should be throwing a code to the OBD11 computer ,plug in a code reader and see what code is showing up. not sure how you know its the No.1 cyl giving problems but if you've changed Coil,plug wire and plug it may not be the problem,a bad valve would either show some smoke blowby through the exhaust or oil contamination of the plug or it would be making some kind of noise.

05-22-2009, 09:11 AM	#3
IllusionX It's the illusion you see View User's Garage Drives: 07 Yaris Sedan Aero Join Date: Oct 2006 Location: Brossard, QC Posts: 3,888	missfire code can also mean it's not firing at all. Upon a cylinder not working, IDLE will be rough, car will lack power and gas consumption will raise. that's all i can tell.. i guess..

05-22-2009, 11:52 AM	#6
IllusionX It's the illusion you see View User's Garage Drives: 07 Yaris Sedan Aero Join Date: Oct 2006 Location: Brossard, QC Posts: 3,888	looks like the 1SZ-FE is a 4cyl engine!

05-22-2009, 10:58 PM	#8
severous01 Drives: 2008 yaris, stripped, red Join Date: Jan 2009 Location: SE Texas Posts: 977	hey, how about checking your valve and lifter lash....it's on the hood. you need a feeler gauge.

05-23-2009, 09:30 AM	#9
TheSilkySmooth Drives: 08 3DR 5M Bayou Blue; 09 Fos Join Date: Oct 2008 Location: New Hampshire Posts: 622	Do a compression test first. Also, The coil may look OK and have the specified impedance but still be bad due to dielectric breakdown. Luck on this one, mate.