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| Cold idle not working (Page 1/1) |
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Kitskaboodle
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DEC 25, 01:36 AM
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My 86 GT cold idle has never worked.
When it’s dead cold and you first start it, it idles around 850-950 rpms and stays there. It never goes in to a fast idle like my 85 GT. Strangely, it warms up fine at this rpm. My 85 GT behaves completely the opposite! In fact, it will go immediately to about 1400 rpm and it will take a good 2.5 -3:00 minutes to go back down to about 1050 rpm.
What is causing my 86 GT to not go in to a fast idle when cold? Cold start injector plugged? Electrical issue? Throttle body issue? Lastly, my 86 is an auto. Thanks, Kit
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Patrick
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DEC 25, 02:08 AM
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Are the Coolant Temperature Sensor (CTS) and Manifold Air Temperature (MAT) sensor reporting the correct temperatures to the ECU? Is the Idle Air Control (IAC) valve functional? Is the IAC air passage clear?
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olejoedad
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DEC 25, 11:35 AM
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85 and 86 use different ECUs, perhaps it is a difference in programming between the two.
If it isnt affecting warm up, I wouldnt worry about it.....
And how cold does it get in San Jose anyway?[This message has been edited by olejoedad (edited 12-25-2019).]
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cvxjet
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DEC 25, 12:02 PM
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I wanted to chime in here.....I am having the same situation with my 85- It has no cold idle- this may have started with me swapping in an 88 computer- But I don't remember having this problem a year ago when I swapped the computer.......( It has had a 3.4 F-body long block for 20 years....)
I may try to swap the computer back......By the way, which sensor actually tells the 'puter that the engine is "Cold"..?
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Gall757
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DEC 25, 01:21 PM
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| quote | Originally posted by cvxjet:
......By the way, which sensor actually tells the 'puter that the engine is "Cold"..? |
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The Coolant Temp Sensor, (CTS).
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