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I'm not sure how common this failure is but I thought I would document my fix. While cleaning my throttle body I noticed some dry powder like coolant around an aluminum plug.

After some searching I only found a few people who have had this happen. Atleast one of which had the plug come completely out and spray coolant. The thought of this bothered me, the price of a oem throttle body bothered me even more.

I decided removing the pressed in plug and tapping for a 3/8 npt plug was my best option. After putting the plug in with a bit of Loctite 567 I pressurized the setup to 25psi and it's holding beautifully. Hopefully this helps someone. The first picture shows the plug leaking under pressure.
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Very interesting. I wonder if this is where my slight coolant leak is/was. I haven’t cleaned the throttle body yet to find out. Did the timing belt and water pump a while back though and found a minor leak near the thermostat housing from a botched job by whoever did the first timing belt swap and assumed that was it. I’ve been meaning to clean the throttle body lately, so I’ll find out soon. Truck is running rough, owned it for 70,000+ miles and never cleaned it. It’s time.

The truck emptied the overflow tank in about 60,000 miles, so when I say slight, I mean slight. Not enough that I worried about it in the slightest, considering how small our overflow tanks are


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