delayed start

[keVIIIn]

For the last few months i have noticed this from time to time. After driving and shutting car off and coming back out to start the car say an hour or so later, it seems to take abnormally long to start, about 3-4 seconds of cranking before it fires when normally it takes approx 1 second before it fires. I know 3-4 seconds doesn't sound very long but in comparison to normal it is. I read in another thread to check the cam sensor. Any thought behind this? the question in the thread was never answered. What would i be "checking" with the cam sensor?

Athough if I turn the key to the "on" position and wait a second or two to crank it, it will fire automatically. This tells me it isn't getting fuel right away. I had this happen to my 97 thunderbird when i had a leak in the fuel line, it would have to pressurize the lines before it was able to get to the injectors and fire.

Keep in mind this only happens when it has been running, shut off, then restarting soon after. On cold starts it is fine.

Any thoughts what this could be??

 

[zmt325]

IF it was me and i had an extra $200 i would change the plugs, wires, fuel pressure regulator and fuel filter. (depending how long it has been). just a little maintenance before i jumped to the fuel pump conclusion.

you can rent a fuel pressure tester from vatozone. i would probably run a little diagnostic test while doing the tune up. just dont buy your other parts from there.

 

[Sapperfire]

+1 on filter and FPR

 

[keVIIIn]

IF it was me and i had an extra $200 i would change the plugs, wires, fuel pressure regulator and fuel filter. (depending how long it has been). just a little maintenance before i jumped to the fuel pump conclusion.

you can rent a fuel pressure tester from vatozone. i would probably run a little diagnostic test while doing the tune up. just dont buy your other parts from there.

How do those fuel pressure testers work exactly, do you have to take a section of fuel line off?

Also the wires and (i assume plugs) have been changed at some point, it has car quest wires on it..probably not the best brand, but oh well they get the job done..and the car has 77K on it now, do you think the fuel pump could be getting tired already?

 

[KStromberg]

How do those fuel pressure testers work exactly, do you have to take a section of fuel line off?

Also the wires and (i assume plugs) have been changed at some point, it has car quest wires on it..probably not the best brand, but oh well they get the job done..and the car has 77K on it now, do you think the fuel pump could be getting tired already?

I have 145k miles on my original fuel pump. They shouldn't puke out before 100k unless you habitually drive around with a low tank. The fuel pressure gauge hooks up to the schrader valve on the fuel rail under the hood to obtain a reading. It looks like a bike tire valve and more than likely has a plastic cap over it. Fuel pressure should be 35-45 psi at idle.

 

[chris2523]

How do those fuel pressure testers work exactly, do you have to take a section of fuel line off?

screws onto the schrader valve (like a tire pressure valve) on the fuel rail and reads the pressure.

 

[keVIIIn]

Oh ok, i see how it works..and fuel pressure should be in the 35 to 45 range while not running with key on yes?

 

[Lownslowlsc]

@ idle as ks said.

 

[keVIIIn]

oops overlooked that, thanks

 

[chris2523]

Oh ok, i see how it works..and fuel pressure should be in the 35 to 45 range while not running with key on yes?

@ idle as ks said.

oops overlooked that, thanks

eh. 30 at idle, 40 car off.
that's my car with a new FPR and 255lph pump.