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Old 10-26-2017, 12:43 PM   #1
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Car hard to start after warm up

I recently acquired a 91 ford mustang gt, and i have trouble starting the car after a 20+ min ride. It cranks for about ten seconds until the engine finally turns over. And when it does, it idles kind of funny, but it still drives. I've been browsing the internet and i found out that it might be my ect sensor. I've checked my car dozens of times but i can't locate the ect sensor or the connector plug. The car has no heater tube, the thermostat housing doesn't have a threaded port to connect the ect sensor to, and i've also checked the intake manifold but no luck. Please help! I recently ran codes today and these are the codes that I got: 51, 22, 63, 54, 31, 85, and 87. Thanks in advance.
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Old 10-26-2017, 01:17 PM   #2
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Old 10-26-2017, 06:21 PM   #3
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Your engine has had the fuel injection removed at some point, and a carburetor has been installed. So I doubt that it has a ECT sensor now. All of the engine management sensors are no longer necessary since it has a carburetor.
I would start looking at how the fuel supply line is routed to the carburetor. It sounds like you may be experiencing what we used to refer to as "vapor lock" years ago. This is when the fuel becomes super heated inside of the fuel line, and turns into a vapor. It can make the engine difficult to start when the engine is hot.
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Old 10-26-2017, 10:42 PM   #4
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Thanks for the advice. I'll check into the fuel lines and let you know what happens.
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Old 10-27-2017, 12:20 AM   #5
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The fuel line should be routed away from, and not touching, any heat source. As well as can be practically done, anyway.
A couple of other things come to mind:
Fuel injected engines like to run at a higher operating temperature than carbureted engines. I wonder if the higher temperature thermostat was reused when the carburetor swap was done? That can cause enough heat soak after shutting the engine off for a few minutes to prevent a carbureted engine from re-starting easily, in certain circumstances.
It really could be any number of things. Without having the computer doing a diagnosis, you are going to have to figure out what is going on the old fashioned way.

And I'll bet that the PCM is throwing about a hundred codes! Lol
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Old 10-28-2017, 11:28 AM   #6
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Lol yea I had several codes for sensor related problems so I figured that was because of the swap to a carburetor. If you look down under the hood you'll find at least a dozen loose connectors. But today after work I'm gonna cover the fuel lines with some heat sleeve and reroute them as far away from any sources of heat as I can. Eventually I'll get around to swapping to an electric fam from LMR as well. I've heard about people wiring their electric fans to stay on for 3 minutes after the engine has shut off to prevent heat soak. Does anyone by chance know how this is done? Thanks in advance .
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