98 sedan hard start

[i8uiky]

It cranks for 15-25 seconds and will backfire a few times just before starting. after it starts it runs perfect and starts normal for the day. what could be the causes I can check into.

[Caddytech]

Originally Posted by i8uiky

It cranks for 15-25 seconds and will backfire a few times just before starting. after it starts it runs perfect and starts normal for the day. what could be the causes I can check into.

It could be a couple things-It sounds like you might be losing fuel pressure-I would check the fuel pressure regulator located under the top cover for the engine-If that's not it, it might the fuel pump or unlikely the fuel injectors leaking down-

[i8uiky]

Originally Posted by Caddytech

It could be a couple things-It sounds like you might be losing fuel pressure-I would check the fuel pressure regulator located under the top cover for the engine-If that's not it, it might the fuel pump or unlikely the fuel injectors leaking down-

the fuel pressure buiilds up when I turn the key on and when I check the service valve it has plenty of pressure.

[Caddytech]

Originally Posted by i8uiky

the fuel pressure buiilds up when I turn the key on and when I check the service valve it has plenty of pressure.

Yeah it will-But when starting the vehicle the pressure regulator isn't
holding the fuel pressure- That's why you get the extended crank-
Because the fuel pump has to pump fuel all the from the rear to the front-That's the purpose of the regulator is to hold fuel pressure in the fuel rail--Let me know how it turns out--

[i8uiky]

Originally Posted by Caddytech

Yeah it will-But when starting the vehicle the pressure regulator isn't
holding the fuel pressure- That's why you get the extended crank-
Because the fuel pump has to pump fuel all the from the rear to the front-That's the purpose of the regulator is to hold fuel pressure in the fuel rail--Let me know how it turns out--

fuel pressure during crank is 45 psi