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Joined: Feb 2010
Posts: 16,076
Campfire Ranger
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OP
Campfire Ranger
Joined: Feb 2010
Posts: 16,076 |
Son’s 4 cylinder Tacoma started missing last night. My scanner showed a misfire on cylinder # 2 and a bad O2 sensor. To try and narrow down the problem, I swapped plugs and coils from cyls 1 and 2. I thought that if the injector was bad, I’d still get a misfire on number two. If it was the coil or plug, I’d get a misfire on #1, right?
Now it shows a misfire on both 1 and 2.
What are the odds the injector and coil on the same cylinder go tits up at the same time? Do you think I have a bigger problem?
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Joined: Feb 2010
Posts: 16,076
Campfire Ranger
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OP
Campfire Ranger
Joined: Feb 2010
Posts: 16,076 |
If that ain’t enough, I get in my truck to go to the parts house, and damned if it’s not missing. Looks like it has a bad injector as well! LOL
Last edited by gregintenn; 07/21/21.
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Joined: Dec 2019
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Campfire Tracker
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Campfire Tracker
Joined: Dec 2019
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Joined: May 2016
Posts: 60,440 Likes: 13
Campfire Kahuna
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Campfire Kahuna
Joined: May 2016
Posts: 60,440 Likes: 13 |
Gawd...I chased a missfire for months.
Cracked plug.
I am MAGA.
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Joined: Jun 2008
Posts: 6,078 Likes: 1
Campfire Tracker
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Campfire Tracker
Joined: Jun 2008
Posts: 6,078 Likes: 1 |
A Toyota??? Impossible. They all go for 350k miles, trouble free.
Any chance you got rodents chewing on your vehicles’ wiring??
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Joined: Mar 2005
Posts: 17,527
Campfire Ranger
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Campfire Ranger
Joined: Mar 2005
Posts: 17,527 |
Did you try new spark plugs? I'd think sparkplug before coil, and ejector last.
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Joined: Oct 2003
Posts: 12,664
Campfire Outfitter
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Campfire Outfitter
Joined: Oct 2003
Posts: 12,664 |
I'd change plugs, plug wires, and dump two small bottles of Lucas Fuel System cleaner in the tank and fill it up with non-ethanol fuel if it's available.
The Karma bus always has an empty seat when it comes around.- High Brass
There's battle lines being drawn Nobody's right if everybody's wrong
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Joined: Feb 2010
Posts: 16,076
Campfire Ranger
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OP
Campfire Ranger
Joined: Feb 2010
Posts: 16,076 |
That’s what I’m afraid of. It’ll go to a mechanic if what I’ve ordered don’t fix it.
Last edited by gregintenn; 07/21/21.
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Joined: Sep 2011
Posts: 976
Campfire Regular
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Campfire Regular
Joined: Sep 2011
Posts: 976 |
And also check rotor, could be burnt up. I would change plus and wires first thing. Use a good fuel injector cleaner every oil change to kep running good. Good luck
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Joined: Jan 2012
Posts: 67,130 Likes: 30
Campfire Kahuna
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Campfire Kahuna
Joined: Jan 2012
Posts: 67,130 Likes: 30 |
SEAFOAM
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Joined: Oct 2003
Posts: 3,859
Campfire Tracker
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Campfire Tracker
Joined: Oct 2003
Posts: 3,859 |
And also check rotor, could be burnt up. I would change plus and wires first thing. Use a good fuel injector cleaner every oil change to kep running good. Good luck Which rotor should he check?
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Joined: Feb 2010
Posts: 16,076
Campfire Ranger
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OP
Campfire Ranger
Joined: Feb 2010
Posts: 16,076 |
And also check rotor, could be burnt up. I would change plus and wires first thing. Use a good fuel injector cleaner every oil change to kep running good. Good luck Which rotor should he check? Brake rotors are in good shape.
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Joined: Feb 2010
Posts: 16,076
Campfire Ranger
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OP
Campfire Ranger
Joined: Feb 2010
Posts: 16,076 |
SEAFOAM I drink a bottle of that chit every week. Should live forever.
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Joined: Mar 2005
Posts: 17,527
Campfire Ranger
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Campfire Ranger
Joined: Mar 2005
Posts: 17,527 |
How many miles on engine? Takes really low compression for misfire. I wouldn't think compression... possible coilpacks are bad, they usually die close together like headlights...
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Joined: Dec 2019
Posts: 17,194 Likes: 12
Campfire Ranger
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Campfire Ranger
Joined: Dec 2019
Posts: 17,194 Likes: 12 |
buy some new plugs. try them. might as well pick up wires to to save a second trip... you can laws s return them if you don't use them.
-OMotS
"If memory serves fails me..." Quote: ( unnamed) "been prtty deep in the cooler todaay " Television and radio are most effective when people question little and think even less.
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Joined: Feb 2006
Posts: 6,883
Campfire Tracker
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Campfire Tracker
Joined: Feb 2006
Posts: 6,883 |
. Not sure about Toyotas if each cylinder has a coilpack remotely for each cylinder and a wire running to each.
Plugs are give me, replace them. I dropped number #3 coil on my f150. Within a week I dropped 2 more.
Last edited by Joel/AK; 07/21/21.
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Joined: Dec 2003
Posts: 86,230 Likes: 24
Campfire Oracle
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Campfire Oracle
Joined: Dec 2003
Posts: 86,230 Likes: 24 |
OBDII
Any codes?
Last edited by ironbender; 07/21/21.
If you take the time it takes, it takes less time. --Pat Parelli
American by birth; Alaskan by choice. --ironbender
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Joined: Jan 2016
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Campfire Outfitter
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Campfire Outfitter
Joined: Jan 2016
Posts: 12,032 Likes: 2 |
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Joined: Feb 2007
Posts: 61
Campfire Greenhorn
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Campfire Greenhorn
Joined: Feb 2007
Posts: 61 |
Check compression first to rule out a mechanical problem. It might have a bad coil that burned out the driver in the ECM, I’ve had it happen. To check to see if the driver is working, unplug the coil and check for flashing 12v across the terminals of the coil.
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Joined: Jul 2011
Posts: 1,792
Campfire Regular
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Campfire Regular
Joined: Jul 2011
Posts: 1,792 |
First what year is the 4 cylinder Tacoma? I,m assuming it is 96 or newer. Anyway. Besides putting it on a Scan tool and checking for codes
Did you replace the O2 sensor. Next you can check the compression. Toyotas get tight exhaust valves. caused by valve recession, that means the exhaust valve has pounded into the head
Causing a miss fire and High HC. First you try to adjust the valves then if it still misses you have to grind the valves and put in new valve seats.
I would take the truck to someone who has a smog machine and see how high the HC,s are. You also want to test to see if the truck is running to lean. Like a plugged
fuel filter. I usually drilled a small test whole ahead of the Cat to see what the actual Air Fuel ratio is before the Cat. How many miles on truck. You could also have
partially plugged furl injectors. You should be able to tell by switching them around.
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