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Old 01-09-2020, 01:15 PM #1
4runnerfever67 4runnerfever67 is offline
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Spark plug replacement check engine light?

Sorry this is long i just dont want to leave out details. have a 2000 4runner limited with 3.4L v6 5vzfe engine. Came home from school yesterday and decided to change my spark plugs. I started on the right side opposite of the air intake and replaced all 3 plugs easily. When i got to the left side the first plug i tried pulling closest to the power steering was seized and so i tried to get it free by spraying some penetrating oil down in the well to break it loose. After a little bit i still cant get it to budge and its getting dark out so i decided to just put it all back together and finish the rest tomorrow. I start the car and its idling rough with engine light which freaked me out. Next i decided to take out the new plugs i just installed on the right side of engine and put the old ones back in. When i did this it ran fine with no light. I let the car be and this morning i come out to start it and the light comes back on and i hear a noise coming from the same seized plug closest to the power steering pump. Im not an expert and im really confused what i did wrong? I thought spark plugs were a pretty straight forward easy job that was hard to mess up so i thought i would try it. If you know anything please let me know. I will be try things to fix it all day today until i figure it out. I have a video on youtube of the problem. Thank you!

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Old 01-09-2020, 02:33 PM #2
VernySanders VernySanders is offline
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Quote:
Originally Posted by 4runnerfever67 View Post
Sorry this is long i just dont want to leave out details. have a 2000 4runner limited with 3.4L v6 5vzfe engine. Came home from school yesterday and decided to change my spark plugs. I started on the right side opposite of the air intake and replaced all 3 plugs easily. When i got to the left side the first plug i tried pulling closest to the power steering was seized and so i tried to get it free by spraying some penetrating oil down in the well to break it loose. After a little bit i still cant get it to budge and its getting dark out so i decided to just put it all back together and finish the rest tomorrow. I start the car and its idling rough with engine light which freaked me out. Next i decided to take out the new plugs i just installed on the right side of engine and put the old ones back in. When i did this it ran fine with no light. I let the car be and this morning i come out to start it and the light comes back on and i hear a noise coming from the same seized plug closest to the power steering pump. Im not an expert and im really confused what i did wrong? I thought spark plugs were a pretty straight forward easy job that was hard to mess up so i thought i would try it. If you know anything please let me know. I will be try things to fix it all day today until i figure it out. I have a video on youtube of the problem. Thank you!

YouTube
The spark plug could have broken depending on how you handled it or maybe some oil is in the actual electrical connection between the plug and the wire the latter is unlikely to be causing your issue. I'd say the plug is broken. It shouldn't be that seized. Put a long extension on the plug with the proper socket and dont be afraid to put a little force behind it as long as your turning it the right way and its loosening. Get a nice sized 1/2" drive ratchet to give you the proper leverage while you turn it out. With the new plugs you install put some anti seize grease on the threads. Also ensure that you have dual electrode plugs and not standard single electrode. As this is what our 5vz engines use. Let me know if that helps, hope a little brute strength gets the job done for ya.
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Old 01-09-2020, 11:37 PM #3
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Do you have the correct plugs for the engine? As these engines use the double electrode plugs.

The driver side is the coil pack side so mostly the plug cylinders are kept fairly clean from dirt and debris. The passenger side mostly keeps fairly clean as well.

How much force are we talking here trying to remove this seized plug.

You using a 1/4 drive, 3/8 drive or 1/2 drive?

As long as you have the proper socket on the plug with 3/8 drive breaker bar it really should just come out.

Were this plugs ever changed before? As my one rig had the original spark plugs in at 215k miles. I actually had an electrode break off and get sucked in the engine with a piece still in the piston from the PO. Mine though never changed prior to me came out and I put anti seize on the new plugs when they went in.





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1997 4X4 V6 5 Speed Sr5 4 Runner (97 5 speed )
1997 4X4 V6 Red limited 4 Runner (97 Limited)
1998 4X4 V6 Sr5 Red 4 Runner (98 Tetanus1 )
1998 4X4 V6 Sr5 Silver 4 Runner (98 Tetanus2)
2001 4X4 V6 Sport Green 4 Runner (01 Green Sport)
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Old 01-10-2020, 11:01 AM #4
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Quote:
Originally Posted by brillo_76 View Post

Were this plugs ever changed before? As my one rig had the original spark plugs in at 215k miles. I actually had an electrode break off and get sucked in the engine with a piece still in the piston from the PO. Mine though never changed prior to me came out and I put anti seize on the new plugs when they went in.

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With plugs being so cheap I change mine out frequently to prevent this ever happening. Usually swap them every 4th oil change or before putting the 4runner to sleep for the winter if storing it. I just got a set from the dealer for under $2 each.
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Old 01-10-2020, 03:44 PM #5
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Do the four cylinder engines also use the dual electrode plugs? Was just about to go shopping for plugs, oil, filters...haven't yanked the old ones yet, just bought the truck...
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Old 01-10-2020, 07:57 PM #6
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Quote:
Originally Posted by brillo_76 View Post
Do you have the correct plugs for the engine? As these engines use the double electrode plugs.

The driver side is the coil pack side so mostly the plug cylinders are kept fairly clean from dirt and debris. The passenger side mostly keeps fairly clean as well.

How much force are we talking here trying to remove this seized plug.

You using a 1/4 drive, 3/8 drive or 1/2 drive?

As long as you have the proper socket on the plug with 3/8 drive breaker bar it really should just come out.

Were this plugs ever changed before? As my one rig had the original spark plugs in at 215k miles. I actually had an electrode break off and get sucked in the engine with a piece still in the piston from the PO. Mine though never changed prior to me came out and I put anti seize on the new plugs when they went in.





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That's a funny story!! The pintle cap on my fuel injector broke in half and fell into the engine because an o ring simply refused to leave its place while I pulled the injectors out to swap them with new ones, debated on tearing the engine down to get to it and then I said screw it it's got almost 260k and it's a toyota I'll be fine, after trying to use compressed air amongst other methods to get it out. Never gave me an issue, still floating around in there somewhere. (Probably melted to the top of the piston lol)
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Old 01-11-2020, 02:11 PM #7
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Ok so yesterday i managed to get the seized plug out and i reinstalled with all brand new ngk BKR5EKB-11 spark plugs. I also replaced the coil spark plug boots to ensure a good fit. I still have stock spark plug wires though. After reinstalling eveything i turned the car over and it started and then immediately died. Im really confused what i did wrong. Are my spark plugs installed to tight. I hand tightened each one and then using a torque wrench put them down to 15ft-lbs.
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Old 01-11-2020, 02:14 PM #8
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[QUOTE=brillo_76;3421720]Do you have the correct plugs for the engine? As these engines use the double electrode plugs.

The driver side is the coil pack side so mostly the plug cylinders are kept fairly clean from dirt and debris. The passenger side mostly keeps fairly clean as well.

How much force are we talking here trying to remove this seized plug.

You using a 1/4 drive, 3/8 drive or 1/2 drive?

As long as you have the proper socket on the plug with 3/8 drive breaker bar it really should just come out.

Were this plugs ever changed before? As my one rig had the original spark plugs in at 215k miles. I actually had an electrode break off and get sucked in the engine with a piece still in the piston from the PO. Mine though never changed prior to me came out and I put anti seize on the new plugs when they went in.



I got the seized plug out finally. Im using double electrode plugs ngk BKR5EKB-11 i installed all 6 at 15 ft-lbs. I also installed new coil spark plug boots. Now the car starts and dies immediately.
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Old 01-11-2020, 08:29 PM #9
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Quote:
Originally Posted by 4runnerfever67 View Post
Ok so yesterday i managed to get the seized plug out and i reinstalled with all brand new ngk BKR5EKB-11 spark plugs. I also replaced the coil spark plug boots to ensure a good fit. I still have stock spark plug wires though. After reinstalling eveything i turned the car over and it started and then immediately died. Im really confused what i did wrong. Are my spark plugs installed to tight. I hand tightened each one and then using a torque wrench put them down to 15ft-lbs.
If the MAF sensor's plug isn't inserted, isn't fully inserted, or has a broken wire you'll get that starts-then-stops behavior.
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Old 01-12-2020, 10:38 AM #10
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Did you swap out the plug wires? When changing the plugs, did you put the wires back in the correct location? If not, you may have jumped the timing.
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Old 01-12-2020, 12:15 PM #11
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Originally Posted by 4Tuitous View Post
Do the four cylinder engines also use the dual electrode plugs? Was just about to go shopping for plugs, oil, filters...haven't yanked the old ones yet, just bought the truck...
No they don't. Just a standard old plug. I just get them at the dealer for around $2 each. It is a very easy job on the 3rz. Love the engine for maintenance.

I've tried fancier more expensive plugs in the past and seen no improvement so now I stick to the OEMs.
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Old 01-12-2020, 12:20 PM #12
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Originally Posted by 4runnerfever67 View Post
Ok so yesterday i managed to get the seized plug out and i reinstalled with all brand new ngk BKR5EKB-11 spark plugs. I also replaced the coil spark plug boots to ensure a good fit. I still have stock spark plug wires though. After reinstalling eveything i turned the car over and it started and then immediately died. Im really confused what i did wrong. Are my spark plugs installed to tight. I hand tightened each one and then using a torque wrench put them down to 15ft-lbs.
Do you have to remove any connectors or vacuum hoses to change plugs on the V6? Sounds like you unhooked something and forgot to put it back. New plugs shouldn't cause any problems.
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Old 01-12-2020, 02:23 PM #13
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Spark plug replacement check engine light?

Did you disconnect the battery during the process.

Mine will occasionally stumble and die after being reset.

If not then check for loose or unpluged connections


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