BHG or not?

supramacist

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The air could have came from not filling the coolant propperly and I have had the same problem. But your'e right. I may be wrong. If I am ......, don't tell my old lady.
 

JesseH

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Nov 12, 2005
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One thing you might want to check is the radiator hose that goes behind the sparkplug gallery. If its slightly loose then that could be the problem. Also if its leaking due to the location it could evaporate off the engine before it hits the ground hence no puddle. It sounds like your having the same problem that I did two summers ago.
 

Toyota h8r

Formerly KILLERMK3
Jan 24, 2006
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well its offical(sp?) I have a massive::bhg:: . The reason the comp test was good was two cyl's had coolant in them and equaled the compression.:cry: Also, how can coolant get into the tb w/o getting in the air intake?
 

Figit090

Fastest mk3 GT4 1/4 mile!
Jan 7, 2006
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how did you confirm the BHG? i'd like to know what exactly was done to test and who tested it....

sorry for the misfortune. its virtually a given with these silly engines. at least you didnt run it when it got hot and unless i missed something it didnt get a massive overheat. if you can fix it yourself you'll save a lot of $$...just so you know. i just got through with my BHG a few months ago.

into the block without getting in the intake? the headgasket is blown. lol. if you dont know your engines you might not realise that the head gasket is what seals the head and the block properly, one reason is so there is no compression leakage, the other reason is because there are water and oil passages that go from the block, to the head, and vice-versa, and without a seal, they would, and can, leak into eachother.

so, there are many possibilities of things this can cause, all are BHG's;

coolant gets in oil - evident by sludge/milkshake oil

oil gets in coolant - you might see it in the overflow resuvoir

exaust gasses get in oil and/or coolant - exaust pressure escaping into these systems causes pressures way to high...and its common for the overflow to...overflow. and your coolant hoses get very, very stiff. you might even blow a hose and instantly loose your cooling...screwing your engine more than before.

oil and/or coolant get in cylinder, and burn - you might see clouds of steam and or smoke... thats what gave mine away right after some coolant flush cleaned out whatever was clogging my BHG.
 

supramacist

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I agree with fig. But the down fall to doing it your self is finding the time and actually sticking with it. If it was my dd I would tow it and have toyota do it. Especially if money was no option.
 

starscream5000

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Aug 23, 2006
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supramacist said:
Dude, you want to get like a 160 degree t-stat.

A fan shroud is right at 125$ a toyota only part. I ran my na with no shroud for a day or so while working on it and I had the exact same symptoms. The car can't cool it self propperly without one. Mine was busted all to hell. When I bought it. Wired up on one side. I rigged it to last as long as I could but buying a new one is inevitable.

A stock Supra t-stat is suppost to be 190 degrees. If you're getting a new one when you do the new hg (might as well, just to be safe ;)) don't get anything lower than 180 degrees. The engine does need to be warm enough to run properly.
 

Figit090

Fastest mk3 GT4 1/4 mile!
Jan 7, 2006
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KILLERMK3 said:
What i was askin was, how can i have coolant in the tb w/o entering the afm or ducting?

the throttle body has coolant lines running to it. i believe this has been known to spring a leak, at least i've read about that before. i cant remember exactly but i think the coolant goes from one section of the body to the other, sealed with a single gasket for the air pipe and the small tubes for coolant, if that is bad, you'll get coolant in your tb.

how did you verify the BHG? if you have a coolant leak you might not have a BHG! if you are just going by steam production in the exaust that is. if you have any other symptoms or a verified fume test in the coolant then you have one.
 

supramacist

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I have buddies that drive z cars. I know these are not supras. But these cats are running 160 degree t-stats. I like the sound of especially sinse these cars over heat so easily. It's less heat wich reduces engine wear and viscosity breakdown. How is this theory not a win win. I'm not being an ass. I am just seeking truth.
 

supramacist

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starscream5000 said:
A stock Supra t-stat is suppost to be 190 degrees. If you're getting a new one when you do the new hg (might as well, just to be safe ;)) don't get anything lower than 180 degrees. The engine does need to be warm enough to run properly.


I'm redoing everything that could possibley create any further problems from the alternator, timing belt, starter, everything. I'm glad these things arent bad to work on. I can't really think of anything I have ever had that was as accessible as this car from every point but crawling under it.