'86 Cougar 5.0 V8 - Rough idle after starting (only when motor is warm)... April 18, 2015, 11:44:13 PM Hey everyone!I'm having a problem that I'm scratching my head trying to figure out. I had posted a month or so that I had changed my spark plugs as they were the original spark plugs that came on the car. I have an '86 Cougar 5.0 V8. I get smooth idle when I first start the car for the day. If I go somewhere after the motor has warmed up, then come out to start the car again, it idles pretty rough (rumbling and bumbling the way it feels), almost to the point it acts like it wants to cut off. I haven't changed the spark plug wires, distributor or rotor. Anyone got any ideas? Any help would be greatly appreciated! :-DThanks in advance,Tommy Quote Selected
'86 Cougar 5.0 V8 - Rough idle after starting (only when motor is warm)... Reply #1 – April 19, 2015, 10:59:07 PM Replace your wires, cap and rotor. Check your coil and take your ign. module to autozone to get tested. Quote Selected
'86 Cougar 5.0 V8 - Rough idle after starting (only when motor is warm)... Reply #2 – April 20, 2015, 09:42:52 AM Where do you find the coil and ignition module? My other question is, will the car shut off while it's still doing this? So far it hasn't, but I'm wondering if it might. Money is tight right now, so I can't change out a lot of parts on it. Quote Selected
'86 Cougar 5.0 V8 - Rough idle after starting (only when motor is warm)... Reply #3 – April 20, 2015, 01:54:06 PM Do you have any check engine lights, does it smoke? Quote Selected
'86 Cougar 5.0 V8 - Rough idle after starting (only when motor is warm)... Reply #4 – April 20, 2015, 02:31:33 PM No check engine lights and it doesn't smoke at all. Quote Selected
'86 Cougar 5.0 V8 - Rough idle after starting (only when motor is warm)... Reply #5 – April 20, 2015, 03:06:59 PM Does it eventually smooth out? Or do you have to wait until it cools off? Quote Selected
'86 Cougar 5.0 V8 - Rough idle after starting (only when motor is warm)... Reply #6 – April 20, 2015, 03:19:52 PM As long as the motor is warm, it will continue to do it. If it's cold, whether starting it for the first time, or after the motor has cooled down, it's smooth. Quote Selected
'86 Cougar 5.0 V8 - Rough idle after starting (only when motor is warm)... Reply #7 – April 20, 2015, 04:03:30 PM If you start the car cold, and drive it until it gets warm, but don't turn it off, is it still fine? Or will it start acting up as it's heating up? Quote Selected
'86 Cougar 5.0 V8 - Rough idle after starting (only when motor is warm)... Reply #8 – April 20, 2015, 05:36:32 PM From what I can tell, it's still fine if I don't turn it off. I'll check for sure either later this evening or tomorrow. Quote Selected
'86 Cougar 5.0 V8 - Rough idle after starting (only when motor is warm)... Reply #9 – April 20, 2015, 08:34:42 PM What about the TFI module? I think they can act up when hot. Quote Selected
'86 Cougar 5.0 V8 - Rough idle after starting (only when motor is warm)... Reply #10 – April 20, 2015, 10:18:47 PM Where's the TFI module? Quote Selected
'86 Cougar 5.0 V8 - Rough idle after starting (only when motor is warm)... Reply #11 – April 21, 2015, 04:40:22 AM Quote from: thetommyboy2k;447339Where's the TFI module?It's mounted on the side of the distributor Quote Selected
'86 Cougar 5.0 V8 - Rough idle after starting (only when motor is warm)... Reply #12 – April 21, 2015, 09:39:22 AM If you replace it, it is generally accepted to use only a Motorcraft piece, not aftermarket/parts store junk. Quote Selected
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