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Old 12-02-2018, 11:22 PM #1
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Coolant residue on intake manifold

Have a 2000 4runner with 3.4 v6. Today I noticed that there's coolant residue on the intake manifold, front of motor passenger side near the temp coolant sensor. I was wondering if the intake gasket is going bad or other. Appreciate any suggestions. Attached a picture, apologize if it is too big etc. First time posting with pics.

Thanks

Mike M
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Old 12-02-2018, 11:28 PM #2
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If it's the front and there's no leakage from the coolant hose that goes through the bottom of the throttle body, then yes, that's most likely the issues. Could also see if the coolant temperature sensor somehow came loose, it's the sensor in the middle between the injectors.
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Old 12-02-2018, 11:35 PM #3
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Thanks for the quick reply. yes at front and no not the tb coolant lines. I was hoping it might be the temp coolant sensor, but looking closely at it, that doesn't appear to be the culprit. To me it almost looks like the intake manifold bolt shown in the picture. Do you know if it's possible to be leaking from that bolt? According to my shop manual, it doesn't mention adding thread sealant to the bolt or if the washers are crush washers.

Thanks

Mm
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Old 12-02-2018, 11:53 PM #4
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Originally Posted by mike_m View Post
Thanks for the quick reply. yes at front and no not the tb coolant lines. I was hoping it might be the temp coolant sensor, but looking closely at it, that doesn't appear to be the culprit. To me it almost looks like the intake manifold bolt shown in the picture. Do you know if it's possible to be leaking from that bolt? According to my shop manual, it doesn't mention adding thread sealant to the bolt or if the washers are crush washers.

Thanks

Mm
That is right where the ECT sensor is located but if that is not leaking?

The lower intake manifold might be cracked?

What about the main water outlet that goes to the radiator, there is a gasket Where it connects to the lower intake manifold.

If Its coming up From below it’s the water bypass, and that would suck. Your going to have to pull the lower intake to fix it. Might as well do knock sensor wire harness while your down that far.
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Old 12-03-2018, 12:11 AM #5
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Pretty sure it's not the ECT sensor as it looks to me most of the coolant is around that intake bolt. I suppose it could be the main water intake gasket. I'll remove the timing cover and do some more investigating.. The truck has 246k and I've never replaced any of those gaskets. If I have to remove the manifold besides possibly replacing the knock sensors and wire harness, would it be a good idea to replace the gaskets on water bypass even if they are not leaking? Leak is pretty small. I lose about a 1 cup of fluid every 3k or so. Slow leak. thanks for the feedback. Also realize that it's one of those jobs where once I get into it, I might want to replace the original vacuum hoses, heater hoses, valve cover gaskets etc. and I'll get pricy pretty quick.
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Old 12-03-2018, 12:52 AM #6
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The bolt location is just coincidence. You could try replacing the front water pipe outlet gasket, all you have to do is take off the timing belt cover a bit and should be able to get to the 10 mm nuts.

But yeah, if it's the intake manifold that's not a small job.
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Old 12-03-2018, 02:50 AM #7
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Hi all I'm new to the forums and to working on 4runners/cars in general, so I'd like to ask this question for my own information: doesn't the intake manifold gasket prevent air from leaking out of the engine block vs coolant? I figured that the head gasket handled the fuel/coolant. Do I have the wrong idea?

Asking cause around a year ago I had an issue with my head gasket leaking coolant into one of the cylinders, which was a major pain because until I had the chance/money to take in to a shop, I had to periodically take the spark plug out of that chamber and stick a rag in to soak up the coolant, to prevent that cylinder from misfiring.
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Old 12-03-2018, 09:00 AM #8
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Quote:
Originally Posted by medusa3000 View Post
Hi all I'm new to the forums and to working on 4runners/cars in general, so I'd like to ask this question for my own information: doesn't the intake manifold gasket prevent air from leaking out of the engine block vs coolant? I figured that the head gasket handled the fuel/coolant. Do I have the wrong idea?

Asking cause around a year ago I had an issue with my head gasket leaking coolant into one of the cylinders, which was a major pain because until I had the chance/money to take in to a shop, I had to periodically take the spark plug out of that chamber and stick a rag in to soak up the coolant, to prevent that cylinder from misfiring.
the 5VZ engine has what toyota calls

Air Intake Chamber Assembly -> Intake Air Connector Assembly -> Intake Manifold Assembly

what we are talking about here is the Intake Manifold Assembly ( lower intake manifold )

it has coolant passages in it for sensors and cooling, it also connects the cylinder block to the radiator via the outlet on the Intake Manifold Assembly.

see diagram here


What your talking about is Cylinder Head gasket shown here in this image. totally different gasket but yes they are both connected to the cylinder block, but not the same coolant passages.
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Old 12-03-2018, 09:27 AM #9
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There is also a couple of smaller coolant lines that run in and out of the Idle Air Control. Check to make sure those are not leaking
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Old 12-03-2018, 09:52 AM #10
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I have seen intake manifold bolts leak when 20 yrs old it happens . I pulled the bolt out put permatex thread sealant and leak stopped.

small coolant leak leaves small stains .verify wash it down and then check that it is the bolt .
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Old 12-03-2018, 10:34 AM #11
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If you clean it off as catrains said and then rent/borrow a cooling system pressure tester that might help figure out where it's coming from.
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Old 11-06-2019, 02:08 AM #12
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Im curious to know if you discovered the origin of the leak? and how you resolved it.

i have the same issue, im doing my timing belt and i noticed a similar coolant leak on the intake manifold
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Old 11-06-2019, 08:22 AM #13
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Originally Posted by willywebster View Post
Im curious to know if you discovered the origin of the leak? and how you resolved it.

i have the same issue, im doing my timing belt and i noticed a similar coolant leak on the intake manifold
Just fixed the same issue, your intake manifold gaskets are leaking. Replace the gaskets and the knock sensor harness while you're in there.
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Old 11-06-2019, 06:06 PM #14
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That coolant looks fresh, looks like either the leak just started or is getting worse. Intake manifold gasket is the primary cause. The rubber seals around the coolant passageways corrode over time and fail.
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Old 11-07-2019, 02:44 AM #15
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thanks for the responses guys!! i pulled timing covers off and the water pump was leaking and i have a sizeable coolant deposit just below the cam seal (i attached a few pics) any chance that the water pump leaked coolant onto the timing belt kicking coolant up and dumping on the intake manifold? or am i reaching?(im not real stoked about doing the intake manifold gasket)

im going to begin removing the plenum,i was going to do the valve cover gaskets any way so ill get a better look at things . if i do end up having to change out the intake manifold gasket is there anything other than the knock sensor wiring harness a guy should replace? like fuel injectors ect
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