Hard starting...

[MustangGT95]

Lately my car has became pretty hard to start. Takes a lot of cranking to get it to start.

I have changed the plugs, wires, cap, rotor, coil, and fuel filter so far. Still doing the same thing. Also changed the injectors recently. (whole different problem).

I just can't seem to figure out why its so hard to start now. Its been 10-20 degrees so I thought maybe that was it. But it was 55 today and it had the same issue.

Could the O2 sensors cause this? I was going to replace those next...

 

[parchisi]

My car usually cranks for a long time too, especially when its warm. Its been tuned though and no other problems, so I just chalk it up as a loss and deal with it.

 

[HISSIN50]

Is the issue better, worse or indifferent if the car has sat overnight?

 

[MustangGT95]

Longer it sits the worse it is. I am worried about it because up till 2 weeks ago it started very quickly. Battery was getting weak so I changed it also. Cranks faster but still takes awhile.

After I have been driving and restart it starts right up like it used to.

 

[Bosko5.0]

can you hear the fuel pump prime? try turning the key on for 3 sec then off then try to start the car.

 

[Bosko5.0]

try to turn key on 3 secs turn off then start car.

 

[Bosko5.0]

try to turn key on 3 secs turn off then start car.

 

[Bosko5.0]

try to turn key on 3 secs turn off then start car.

 

[HISSIN50]

try to turn key on 3 secs turn off then start car.

Quoted in case this sentiment was missed.

I agree and it's where I was going with my last question.

Do try the 3 primes before starting idea. Or put a FP gauge on the Schrader valve and watch pressure after one prime and see if it's above 30 PSIG.

I might also check the ECT sensor to make sure it's not way off base. I only have specs for it going down to ~50*F however (we could probably extrapolate a value if needed).

Good luck.

 

[TheDamned]

Check the fuel pump, I had a similar problem, replaced the pump by a Walbro and tadam.

 

[MustangGT95]

I suspect it is fuel related since its getting terrible mileage.

It has a walbro in it but its probably been 4-5 years since it was replaced.

 

[MustangGT95]

I went ahead and ordered a new 255lph pump. Just incase I get that nitrous kit I've been wanting

 

[MustangGT95]

Walbro 255 fixed it. Starts on the 1-2 revolution again. Nice.