12-30-2020, 12:56 AM
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#16
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Senior Member
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Join Date: Apr 2020
Location: Monroe, WA
Posts: 2,205
Real Name: Devan
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Senior Member
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Location: Monroe, WA
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Real Name: Devan
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Quote:
Originally Posted by 4x4runnerMT
Do you guys think I would be better off taking the time to diagnose where the coolant is going? Or do you think it would be worth it to just do the head gasket now?
Like I said, the coolant was almost completely gone out of the reservoir when the spark plug blew.
Thanks!
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Do we think you'd be better off diagnosing a problem or take a $1500 shotgun approach? Hmmm, tough call..
Have you ever done your intake manifold gaskets? The coolant port on them tends to become corroded with age, maybe some material has worn away and some is making it's way through to the nearest valve. Remember, the coolant isn't doing anything particularly magical or crazy in the head - it's merely following a passage. There's not really anywhere for it to hide, especially without you noticing
Could always have something inconspicuous too like a cracked rad
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12-30-2020, 05:47 AM
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#17
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Join Date: May 2004
Location: Mideast
Posts: 979
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OP, where did you check the coolant? radiator or the plastic reservoir to the left of the radiator?
If you were looking at the radiator that you checked, then yes, you should be looking at another problem that's causing the loss of coolant.
If you were looking at the plastic reservoir, was the engine hot or cold? If the engine is hot, then there should be coolant in there. If the engine was cold, then there should be less coolant in there because the coolant goes back into the radiator.
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12-30-2020, 09:47 AM
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#18
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Senior Member
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Join Date: Feb 2019
Location: Hot Springs, AR
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Real Name: Patrick
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I would definitely try to diagnose before replacing anything. You should still be able to do compression and leak down testing on the other 5 cylinders as well as pressure testing the cooling system.
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05-05-2022, 03:27 PM
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#19
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Junior Member
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Join Date: Dec 2020
Location: Montana
Posts: 24
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Location: Montana
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UPDATE
It’s running again!
I realized I was a dummy and was looking at just the coolant overflow reservoir and not in the radiator. Radiator had plenty of coolant. I bought the time sert kit for spark plugs. It was super easy and worth every penny.
After retaping the spark plug holes and putting a new plug and coils in, it fired right up. Flushed coolant system, changed engine oil, etc. and it has been running great.
Now, however, it seems as if the transmission is slipping. Vehicle sat for about 1.5 years, never had any issues of slipping. Now when I’m at a stop and accelerate, it slips to around 2k RPMS and then finally catches.
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05-06-2022, 11:23 AM
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#20
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Join Date: Jul 2013
Location: NOVA
Posts: 1,466
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Quote:
Originally Posted by 4x4runnerMT
UPDATE
It’s running again!
I realized I was a dummy and was looking at just the coolant overflow reservoir and not in the radiator. Radiator had plenty of coolant. I bought the time sert kit for spark plugs. It was super easy and worth every penny.
After retaping the spark plug holes and putting a new plug and coils in, it fired right up. Flushed coolant system, changed engine oil, etc. and it has been running great.
Now, however, it seems as if the transmission is slipping. Vehicle sat for about 1.5 years, never had any issues of slipping. Now when I’m at a stop and accelerate, it slips to around 2k RPMS and then finally catches.
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Definitely would recommend starting with a simple drain and fill of the tranny. If that doesn't solve anything, I'm not entirely sure how to proceed at that point...
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05-06-2022, 02:03 PM
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#21
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Elite Member
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Join Date: Feb 2011
Location: Bend, OR
Posts: 9,902
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I would pull the transmission pan, inspect and clean the intake screen, inspect and clean the magnets, reinstall the pan, and do a good transmission fluid flush.
I didn't catch what year your 4Runner was, so while you're doing that it wouldn't hurt to double check your connections and if your vehicle is a bit on the earlier side of the 3rd gen spectrum make sure the throttle cable to the transmission is set-up properly.
That'd be where I'd start first given what you said about it sitting and other stuff you've done so far. After than you'll probably have to narrow down on things if the issue is still there.
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05-11-2022, 03:30 PM
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#22
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Junior Member
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Join Date: Dec 2020
Location: Montana
Posts: 24
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Junior Member
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Location: Montana
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Thanks! I’ll start with that and see if that helps at all.
The 4Runner is a 1997. Not sure when the transmission fluid would have been flushed last. I’ve had it about 3ish years and haven’t done anything with it yet. Vehicle has about 230,000 miles currently. Picked it up with about 190,000 miles.
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05-11-2022, 10:09 PM
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#23
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Junior Member
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Join Date: Dec 2020
Location: Montana
Posts: 24
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Junior Member
Join Date: Dec 2020
Location: Montana
Posts: 24
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So one concern I have with replacing the transmission fluid is I’m not sure when it would’ve been replaced last. I’ve owned the vehicle for about 30,000 miles and have never done it myself. The transmission fluid was topped off once, didn’t take much and hope that wasn’t a bad idea.
I have heard that replacing the fluid can sometimes cause problems?
I figured since I am already having problems it wouldn’t hurt too much?
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05-11-2022, 11:23 PM
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#24
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Junior Member
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Join Date: Dec 2020
Location: Montana
Posts: 24
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Junior Member
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Location: Montana
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Here’s the original ad from when I bought it if that helps at all.
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05-12-2022, 05:28 PM
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#25
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Elite Member
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Join Date: Aug 2013
Location: Stouchsburg PA
Posts: 5,344
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Our rigs have a drain plug in the trans pan. It’s super easy compared to other vehicles.
I dump the ATF every two to three years. And add 1 gallon. I don’t even bother pulling the dipstick anymore.
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07-03-2023, 07:32 PM
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#26
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Member
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Join Date: Apr 2012
Location: Vernon, BC, Canada
Posts: 879
Real Name: Doug
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Join Date: Apr 2012
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Just had this happen too...
So I did a forum search "helicoil" and this post popped up. Interesting, exactly the same thing happened to me and same cylinder. I bought a bore scope and sucked out the pieces that were left in the cylinder but unfortunately the spark plug wouldn't torque, and just spun. I will try a helicoil... I know you had a bit more going on with the coolant, what was the outcome and if you used a helicoil is it still in place?
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1998 SR5 3.4L V6 Auto... Pretty much bone stock...aside from the Tundra brakes, OME880 and OME906's in back all with Rancho 9000XL adjustable shocks ... "Livin' the dream in the Canadian Okanagan!"
Electronics/Telecommunications Engineering Technologist
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07-03-2023, 08:33 PM
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#27
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Join Date: Sep 2017
Posts: 80
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Quote:
Originally Posted by poleclimber63
So I did a forum search "helicoil" and this post popped up. Interesting, exactly the same thing happened to me and same cylinder. I bought a bore scope and sucked out the pieces that were left in the cylinder but unfortunately the spark plug wouldn't torque, and just spun. I will try a helicoil... I know you had a bit more going on with the coolant, what was the outcome and if you used a helicoil is it still in place?
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You're going to run into this a lot. That guy hasn't been on in over a year. Over half the old threads I want to ask people questions on I check and theyre no longer around.
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07-04-2023, 09:45 PM
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#28
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Member
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Join Date: Sep 2018
Location: Berwick, Maine USA
Posts: 374
Real Name: Mike
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Join Date: Sep 2018
Location: Berwick, Maine USA
Posts: 374
Real Name: Mike
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If the reservoir was empty but the radiator was full after 15,000 miles on an older vehicle with high miles that is absolutely nothing to worry about. Put a thread insert in there and be done with it. I have to top off the coolant on much newer vehicles at every oil change all the time. And no, there is absolutely no way the piston can contact the plug. Most likely it was not tightened enough or the threads were already damaged when you replaced the plug. ***VERY COMMON***
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07-04-2023, 10:04 PM
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#29
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Member
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Join Date: Apr 2012
Location: Vernon, BC, Canada
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Real Name: Doug
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Join Date: Apr 2012
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Quote:
Originally Posted by poisedforflight
You're going to run into this a lot. That guy hasn't been on in over a year. Over half the old threads I want to ask people questions on I check and theyre no longer around.
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You maybe right. These forums are definitely not as frequented as they used to be when I first joined, back in 12'. Social media has had a huge impact, unfortunately, you encounter alot of a$$hole comments, and every arm chair mechanic jumps into the mix. I do miss the informed, constructive forum feedback from the mid to late 2010's... luckily, due to the past brisk activity of t4r.org, there is still a ton of really great info when you search for it.
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1998 SR5 3.4L V6 Auto... Pretty much bone stock...aside from the Tundra brakes, OME880 and OME906's in back all with Rancho 9000XL adjustable shocks ... "Livin' the dream in the Canadian Okanagan!"
Electronics/Telecommunications Engineering Technologist
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