Idle issue nightmare again
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Cross-Country
Joined: Sep 2018
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Idle issue nightmare again
most recent posts have been 87 f 150 wont crank -have been cranking it by jumping solenoid to hot post - But until the engine warms up ,it wont idle & have to give it gas so it will , but after it warms up the idle is good ??? Any idea of why it wont idle when cold --TBI --not a carb,
Lead Driver
Joined: Oct 2016
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From: Houston/Sugar Land
I think I remember you posting something like this before. If so, it is more beneficial to you and others to stick with the same thread to avoid repetitive questions and answers. I don't know if you have run codes or not but that would be a good idea to maybe get you in the right direction. As far as just the description you have posted, my first thought is your ECT is bad. If it is failing, my understanding is the ECT signals can cause the PCM not to add enough fuel because more is needed on cold start. That should be the reason you do idle when warm because your fuel is then ok. Because of the faulty signals the truck is also probably not running very good would be my guess. Sandy
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Cross-Country
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I think I remember you posting something like this before. If so, it is more beneficial to you and others to stick with the same thread to avoid repetitive questions and answers. I don't know if you have run codes or not but that would be a good idea to maybe get you in the right direction. As far as just the description you have posted, my first thought is your ECT is bad. If it is failing, my understanding is the ECT signals can cause the PCM not to add enough fuel because more is needed on cold start. That should be the reason you do idle when warm because your fuel is then ok. Because of the faulty signals the truck is also probably not running very good would be my guess. Sandy
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Cross-Country
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yea ect is what I meant -- Think I replaced that already ? --Isnt that next to the thermostat --Thank you !
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Cross-Country
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Yes Ive tried & tried ;with an OBD1 METER & another method as well ( Iforgot but it was a way to do it without using a meter)
Could not get any codes at all -kept saying I wasnt connected correctly or something like that
Could not get any codes at all -kept saying I wasnt connected correctly or something like that
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Fleet Owner
Joined: Oct 2005
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From: Kentucky
Try cleaning the pins on the data link connector. Many times there is a build up of corrosion. Contact cleaner or even better use a small finger nail file to polish the contacts then try running the KOEO tests and Stored Code display.
If that does not work you most likely have a bad computer. Very common for the capacitor(s) inside the computer to spill out the electrolyte then damage the board. Given all of your engine running issues it's highly suggested to remove the computer for an inspection regardless of the code results.
If that does not work you most likely have a bad computer. Very common for the capacitor(s) inside the computer to spill out the electrolyte then damage the board. Given all of your engine running issues it's highly suggested to remove the computer for an inspection regardless of the code results.
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Cross-Country
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Try cleaning the pins on the data link connector. Many times there is a build up of corrosion. Contact cleaner or even better use a small finger nail file to polish the contacts then try running the KOEO tests and Stored Code display.
If that does not work you most likely have a bad computer. Very common for the capacitor(s) inside the computer to spill out the electrolyte then damage the board. Given all of your engine running issues it's highly suggested to remove the computer for an inspection regardless of the code results.
If that does not work you most likely have a bad computer. Very common for the capacitor(s) inside the computer to spill out the electrolyte then damage the board. Given all of your engine running issues it's highly suggested to remove the computer for an inspection regardless of the code results.
Mountain Pass
Joined: Dec 2018
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Also be careful when you are changing out the ECT sensor.... don't confuse it with the gauge sender.
They are two different things. Quick way to know which is which is the gauge sender only has ONE wire connected to it.
They are two different things. Quick way to know which is which is the gauge sender only has ONE wire connected to it.
Last edited by stonesg; Nov 15, 2019 at 11:18 AM. Reason: misspelling
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GOOD INFO THANK YOU
Fleet Owner
Joined: Oct 2005
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From: Kentucky
I would not bother with changing any sensor until you can get the computer to talk to you. At the very least you should get System Pass Code 11 for the KOEO tests and Stored Codes if the all of the tests passed and there are no stored codes. No reason to run the KOER tests until you do get Code 11 System pass for KOEO and CM/Stored Codes.
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