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Location:
Perth
Registered:
April 2003
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1JZ inlet manifold heat problem...
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Sun, 28 March 2004 05:54
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Hi all, my 1JZ's inlet manifold has one hot spot when the rest is cold.. is this normal?
In the spot marked "source of heat" theres a line that can be seen running into it, which runs down into the side of the block, but this doesn't appear to be coolant, as the coolant line coming from the top of the radiator around the front of the engine is cold also....
THis happens after the engine has only been running for say.. 1 minute on idle... is this normal?
Can someone else test this on their 1JZ for me?
Thanks..
Jim
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Location:
Rocky Mountains, Canada
Registered:
May 2002
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Re: 1JZ inlet manifold heat problem...
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Sun, 28 March 2004 06:50
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The majority of inlet manifolds are heated to stop the throttle plate freezing shut in cold weather.
While i dont know the 1JZ, that is probably a coolant line that bypasses the thermostat, so it heats up very early.
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Location:
Canberra
Registered:
May 2002
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Re: 1JZ inlet manifold heat problem...
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Sun, 28 March 2004 11:41
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Yep, thats how its supposed to work. Redirect/Bypass that hot coolant if you are worried about it. Lotsa guys think it helps to keep the charge air a little cooler. Might not be such a great idea in the frozen back blocks of Canada.
regards Chuck.
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Registered:
August 2002
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Location:
usa
Registered:
October 2003
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Re: 1JZ inlet manifold heat problem...
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Tue, 30 March 2004 03:22
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isn't that for the cold start as well? the reason it idles high until its up to temp
jeremy
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Location:
Brisbane
Registered:
May 2002
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Re: 1JZ inlet manifold heat problem...
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Tue, 30 March 2004 03:46
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It has nothing to do with cold start; when the engine is cold the coolant is cold as well, so what good would it do?
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Location:
Newcastle NSW
Registered:
June 2002
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Re: 1JZ inlet manifold heat problem...
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Wed, 31 March 2004 13:12
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some engines use that small amount of coolant to help control the cold idle. like the thermostat in your radiator, but when its cold it opens to bypass some air to lift the idle and after it heats up closes the valve and drops the idle down again. quite a simple setup with the aditional benefit of icy weather being the freezing issue
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Location:
perth WA
Registered:
January 2003
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Re: 1JZ inlet manifold heat problem...
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Thu, 01 April 2004 09:14
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yep all that is said is true .. i have got rid of mine .. no need for cooling TB . esp in perth .. we dont even get snow ..
get rid of it .. hey whats the dodgy thing down bott of pic .. zip ties and lock wire ?? holding god knows what ..
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