idling issues
#1
idling issues
Have a 2002 ford f-150 rwd with a 5.4 triton.
every time I take it to the garage it stops. Here is the issue
On really hot days even if I don't run the AC in when i have to sit and idle it will start dropping to a low idle and even if I put my foot on the brake it will try to lurch forward in self drive but If I am right behind someone and I can't take the foot off the brake at all it might stall all together or take off but have no power then a few seconds later the gas will work again. Because of it not doing it all the time though I have not been able to pinpoint the exact issue I thought it was a faulty gas cap and maybe rain got in the gas but I put a new cap on and it was fine after that until today. I also noticed every now and then I need to unhook my battery cables so the gas cap light will go off in the dashboard if not it will stay on. I am not a mechanic so it really is hard for me to explain the issues but maybe with more interaction I can narrow it done more.
every time I take it to the garage it stops. Here is the issue
On really hot days even if I don't run the AC in when i have to sit and idle it will start dropping to a low idle and even if I put my foot on the brake it will try to lurch forward in self drive but If I am right behind someone and I can't take the foot off the brake at all it might stall all together or take off but have no power then a few seconds later the gas will work again. Because of it not doing it all the time though I have not been able to pinpoint the exact issue I thought it was a faulty gas cap and maybe rain got in the gas but I put a new cap on and it was fine after that until today. I also noticed every now and then I need to unhook my battery cables so the gas cap light will go off in the dashboard if not it will stay on. I am not a mechanic so it really is hard for me to explain the issues but maybe with more interaction I can narrow it done more.
#2
Have a 2002 ford f-150 rwd with a 5.4 triton.
every time I take it to the garage it stops. Here is the issue
On really hot days even if I don't run the AC in when i have to sit and idle it will start dropping to a low idle and even if I put my foot on the brake it will try to lurch forward in self drive but If I am right behind someone and I can't take the foot off the brake at all it might stall all together or take off but have no power then a few seconds later the gas will work again. Because of it not doing it all the time though I have not been able to pinpoint the exact issue I thought it was a faulty gas cap and maybe rain got in the gas but I put a new cap on and it was fine after that until today. I also noticed every now and then I need to unhook my battery cables so the gas cap light will go off in the dashboard if not it will stay on. I am not a mechanic so it really is hard for me to explain the issues but maybe with more interaction I can narrow it done more.
every time I take it to the garage it stops. Here is the issue
On really hot days even if I don't run the AC in when i have to sit and idle it will start dropping to a low idle and even if I put my foot on the brake it will try to lurch forward in self drive but If I am right behind someone and I can't take the foot off the brake at all it might stall all together or take off but have no power then a few seconds later the gas will work again. Because of it not doing it all the time though I have not been able to pinpoint the exact issue I thought it was a faulty gas cap and maybe rain got in the gas but I put a new cap on and it was fine after that until today. I also noticed every now and then I need to unhook my battery cables so the gas cap light will go off in the dashboard if not it will stay on. I am not a mechanic so it really is hard for me to explain the issues but maybe with more interaction I can narrow it done more.
Off hand , I'd 1st scan for codes and post what comes up.
Then , if this hasn't been done already, I'd change fuel filter and clean and or replace the IAC
#3
If you don't put a Scanner on and see what code you have , you can't effect a fix.
From the description you give, my guess is you have a vacuum leak.
This has shifted the long term fuel tables 'RICH' and makes the motor run rich at near idle causing stalling.
This causes you to add throttle against the brake to keep from stalling.
Pulling the battery cable off reboots the computer shifting the tables back to a no shift point.
This temporarily clears the problem but it will go right back to the previous condition again.
Do it right.
Good luck.
From the description you give, my guess is you have a vacuum leak.
This has shifted the long term fuel tables 'RICH' and makes the motor run rich at near idle causing stalling.
This causes you to add throttle against the brake to keep from stalling.
Pulling the battery cable off reboots the computer shifting the tables back to a no shift point.
This temporarily clears the problem but it will go right back to the previous condition again.
Do it right.
Good luck.
Last edited by Bluegrass; 07-12-2017 at 10:41 PM.
#4
Ironically everytime I have taken it to the garage it stops and runs normal so they can never get a scan on it when it is idling bad.
#5
If you don't put a Scanner on and see what code you have , you can't effect a fix.
From the description you give, my guess is you have a vacuum leak.
This has shifted the long term fuel tables 'RICH' and makes the motor run rich at near idle causing stalling.
This causes you to add throttle against the brake to keep from stalling.
Pulling the battery cable off reboots the computer shifting the tables back to a no shift point.
This temporarily clears the problem but it will go right back to the previous condition again.
Do it right.
Good luck.
From the description you give, my guess is you have a vacuum leak.
This has shifted the long term fuel tables 'RICH' and makes the motor run rich at near idle causing stalling.
This causes you to add throttle against the brake to keep from stalling.
Pulling the battery cable off reboots the computer shifting the tables back to a no shift point.
This temporarily clears the problem but it will go right back to the previous condition again.
Do it right.
Good luck.
#7
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#8
With stopped traffic and lack of air flow under the hood something may offer a leak.
Another thing maybe good to do is flush your radiator so it is cooling as well as it can. Also check the heater core hoses that might weep on the COPS during these "low air flow" times too. You might not notice coolant leaves dropping but just a little bit....but remain level during cooler times of the year. Installing a Fresh T stat might not be bad thought either, unless its been done recently?
#9
Look closely at the connections for the vacuum lines. Something that might seem a little softer then the rest.
With stopped traffic and lack of air flow under the hood something may offer a leak.
Another thing maybe good to do is flush your radiator so it is cooling as well as it can. Also check the heater core hoses that might weep on the COPS during these "low air flow" times too. You might not notice coolant leaves dropping but just a little bit....but remain level during cooler times of the year. Installing a Fresh T stat might not be bad thought either, unless its been done recently?
With stopped traffic and lack of air flow under the hood something may offer a leak.
Another thing maybe good to do is flush your radiator so it is cooling as well as it can. Also check the heater core hoses that might weep on the COPS during these "low air flow" times too. You might not notice coolant leaves dropping but just a little bit....but remain level during cooler times of the year. Installing a Fresh T stat might not be bad thought either, unless its been done recently?
#10
#11
It can be several things....to weak fuel pump, or torque convertor, or shift solenoid, or something simple like vacuum leak or low transmission fluid. It does sound like more than 1 thing is playing into this.