Something kicks in when warmed up

Nov 8, 2018
12
1
3
38
Atlanta
#1
Hello I have a kind of weird problem here. The car will start fine and idle fine when cold but once warmed up if I turn it off it will restart but will not hold the idle unless I hold the pedal down for a few minutes until something kicks in and then the RPMs raise up nice and smoothly, I let my foot off the pedal and it will hold the idle and drive fine. I have installed new distributor coil wires plugs Etc TPS adjusted properly timing has been verified compression checked put the smoke machine on it no leaks new map sensor, vacuum steady at 18. when warm it will not start and hold an idle unless I hold the pedal down and something kicks in then it Smooths out idles fine let my foot off the pedal it would drive fine hold idle at stop lights and everything, slight hiccup here and there but never close to cutting off until I turn it off and then it starts all over again. struggling to try and figure out what that is that's kicking in and making it smooth out
 
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KZGUNS

Active Member
Jul 23, 2018
101
11
28
42
chardon, Ohio
#2
Hello I have a kind of weird problem here. The car will start fine and idle fine when cold but once warmed up if I turn it off it will restart but will not hold the idle unless I hold the pedal down for a few minutes until something kicks in and then the RPMs raise up nice and smoothly, I let my foot off the pedal and it will hold the idle and drive fine. I have installed new distributor coil wires plugs Etc TPS adjusted properly timing has been verified compression checked put the smoke machine on it no leaks new map sensor, vacuum steady at 18. when warm it will not start and hold an idle unless I hold the pedal down and something kicks in then it Smooths out idles fine let my foot off the pedal it would drive fine hold idle at stop lights and everything, slight hiccup here and there but never close to cutting off until I turn it off and then it starts all over again. struggling to try and figure out what that is that's kicking in and making it smooth out
Mine did this and was finally fixed after i put a motorcraft IAC on it. This may or may not fix your problem. You should read through the surging idle checklist on this forum.
 
Nov 6, 2016
107
23
28
46
#3
What's "kicking in" is most likely the ECU going into a different mode. I'm not one of the experts on here, so I don't know the technical terms. I'm sure someone will chime in.
 
Nov 8, 2018
12
1
3
38
Atlanta
#5
Mine did this and was finally fixed after i put a motorcraft IAC on it. This may or may not fix your problem. You should read through the surging idle checklist on this forum.
Thanks I did think of that since I had that issue before on an explorer
 
Nov 8, 2018
12
1
3
38
Atlanta
#6
Before buying any more parts,pull computer codes,use checklist as suggested ,then post results.
All parts were old as dirt so I don't mind that, I've been over the checklist several times. Only codes I get are smog related. I'll pull them again and post back. Thanks
 

General karthief

wonder how much it would cost to ship you a pair
Mod Dude
Aug 25, 2016
9,507
3,025
193
polk county florida
#12
Reset the computer. Unhook the battery, turn on the head lights for 15 minutes or so, turn off lights and hook up the battery. Drive it around for a while. Check for codes again.
 
Nov 8, 2018
12
1
3
38
Atlanta
#14
I unplugged thermactor and whatever else that is down there in the passenger corner and it is restarting and idling on it's own. Now though it's going up and down slowly if iac is plugged in. I'll go back over surging checklist again. Can I just delete them solenoids?
 

General karthief

wonder how much it would cost to ship you a pair
Mod Dude
Aug 25, 2016
9,507
3,025
193
polk county florida
#16
I unplugged thermactor and whatever else that is down there in the passenger corner and it is restarting and idling on it's own. Now though it's going up and down slowly if iac is plugged in. I'll go back over surging checklist again. Can I just delete them solenoids?
You'll be going backwards, plug all that stuff back in and do the computer reset, let us know what you find for codes then we can go from there.
 
Nov 8, 2018
12
1
3
38
Atlanta
#18
You'll be going backwards, plug all that stuff back in and do the computer reset, let us know what you find for codes then we can go from there.
Did that, while I was hooking everything back up I pulled up vacuum diagram and sorted out all the messed up lines. No codes only 11, it starts and holds idle now. Gonna readjust tps and timing cause there's still a skip just off of idle. What's best timing and idle for these with no mods. I'm a Chevy guy just helping a friend out at my shop. Thanks a million man
 

General karthief

wonder how much it would cost to ship you a pair
Mod Dude
Aug 25, 2016
9,507
3,025
193
polk county florida
#19
12-13* with spout removed, about 750 idle. If you go to the surging idle checklist in the technical/how to thread it shows you the proper way to set timing and idle.
 
Nov 8, 2018
12
1
3
38
Atlanta
#20
12-13* with spout removed, about 750 idle. If you go to the surging idle checklist in the technical/how to thread it shows you the proper way to set timing and idle.
everything is good with the idle now thanks a lot but do you think you can give me some tips and pointers. I got a low speed Skip that seems like a ignition miss and it does it every now and then when you're stopped in gear and very rarely it will cut off. Starts right back up and Acceleration is skip free. I've seen a lot of different suggestions on what the tps should be set at, what do you say?