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5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

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Old 04-20-2014, 11:56 AM   #1
bardo
 
Join Date: Apr 2014
Vehicle: 1989, Mustang 5.0 LX
Location: NY
Posts: 8
Default 1989 idle problem when hot

I have an 89 5.0 stock. Car runs good cold, however once it heats up it will sputter/die when idle, such as a red light. It's driving me crazy and I keep throwing money I don't have at it. This is what I've done so far and still continues to give idle problems hot
New: plugs, cap, rotor, coil, tfi, coolant temp sensor.
I cleaned and checked pcv, salt n pepper connections, iac (oem original).
I'm reading codes for o2's and grounds look good, could that really cause bad hot idle? Any help here would be greatly appreciated before I go insane.
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Old 04-20-2014, 01:00 PM   #2
mjr46
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perform base idle reset.....does car start right back up after it dies??
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Old 04-21-2014, 08:38 AM   #3
bardo
 
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Vehicle: 1989, Mustang 5.0 LX
Location: NY
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I've reset idle, it always re starts without a problem, just constantly wants to die when I've got foot off gas and it's a normal operating temp. also changed fuel filter.
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Old 04-21-2014, 09:25 AM   #4
dawson1112
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Vehicle: 1990 lx hatch 5.0
Location: ohio
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What do you have your base Idle set to? IE when hot where does it like to idle at and where does it die? Maybe you just don't have the thing set to idle high enough. Mine likes 750-850 rpm at idle.
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Old 04-21-2014, 11:42 AM   #5
bardo
 
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Location: NY
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It normally idles around 800, once hot and not moving it's starts dropping, putters around 600-800, then falls even more and stalls
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Old 04-23-2014, 08:55 AM   #6
bardo
 
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Vehicle: 1989, Mustang 5.0 LX
Location: NY
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Any ideas out there, it's really driving me crazy, as far as I can tell all vac lines look good too, anyone line in particular I should look at?
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Old 04-23-2014, 08:55 AM
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