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Old 12-30-2020, 12:56 AM #16
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Quote:
Originally Posted by 4x4runnerMT View Post
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!
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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Old 12-30-2020, 05:47 AM #17
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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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Old 12-30-2020, 09:47 AM #18
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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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Old 05-05-2022, 03:27 PM #19
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UPDATE

Itís 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 Iím at a stop and accelerate, it slips to around 2k RPMS and then finally catches.
More projects!
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Old 05-06-2022, 11:23 AM #20
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Quote:
Originally Posted by 4x4runnerMT View Post
UPDATE

Itís 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 Iím at a stop and accelerate, it slips to around 2k RPMS and then finally catches.
More projects!
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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Old 05-06-2022, 02:03 PM #21
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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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Old 05-11-2022, 03:30 PM #22
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Thanks! Iíll 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. Iíve had it about 3ish years and havenít done anything with it yet. Vehicle has about 230,000 miles currently. Picked it up with about 190,000 miles.
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Old 05-11-2022, 10:09 PM #23
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So one concern I have with replacing the transmission fluid is Iím not sure when it wouldíve been replaced last. Iíve owned the vehicle for about 30,000 miles and have never done it myself. The transmission fluid was topped off once, didnít take much and hope that wasnít a bad idea.
I have heard that replacing the fluid can sometimes cause problems?
I figured since I am already having problems it wouldnít hurt too much?


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Old 05-11-2022, 11:23 PM #24
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Hereís the original ad from when I bought it if that helps at all.


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Old 05-12-2022, 05:28 PM #25
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Our rigs have a drain plug in the trans pan. Itís super easy compared to other vehicles.

I dump the ATF every two to three years. And add 1 gallon. I donít even bother pulling the dipstick anymore.


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