Hard starts after sitting overnight

Old 03-26-2019, 08:19 PM
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Hard starts after sitting overnight

Iím trying to diagnose my 1999 TL 3.2L Automatic. When the car sits for about 12hrs or more it takes a while to start. I have to cycle the key multiple times (to activate the fuel pump) after doing this for about few minutes the car will sputter and eventually start. After that it runs and starts perfect for the rest of the day.

Now from my research this points to a fuel pressure issue, Iím losing pressure over night and this is the reason for the hard starting. I decided to buy a fuel pump because I though it could be the check valve. The problem persisted, next I did the fuel pressure regulator and that didnít work. Then I swapped out the injectors.

What else could it be? I havenít hooked up a fuel pressure gauge yet but I did crack the fuel line and it didnít have any pressure after sitting. Or am I looking in the wrong direction? Possibly a bad sensor?
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Old 03-27-2019, 12:24 PM
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In the service manual, there is a section on fuel delivery. Page 11-9 provides some guidance on what to look at with hard starting. There are various tests that you can perform to confirm exactly what the problem is so you don't end up buying a bunch of new parts that you didn't really need.

If it were me, I'd check the fuel pressure next and then look at the ignition system and finally compression after all the fuel stuff has been confirmed working OK.

how well kept has the car been otherwise?
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Old 03-29-2019, 10:31 AM
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Thanks for the reply, the problem is solved. It ended up being the coolant temp sensor. I had the obd2 scanner hooked up on my phone and notice the virtual temp gauge showed the tempature as 280 degrees even when itís cold. Easy fix swapped the sensor out and it starts perfect.

Moral of the story donít throw parts at it without diagnosing.
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