long crank

[jeff9922]

So I have a 98 c1500 with 305 v8 and when I start the truck most of the time it cranks long like its not getting fuel but if I give it gas it starts kind of like if it had a carb . Any one have had a issue like this and might be able to help with some incite . I do have a check engine light for bank 1 sensor 3 o2 sensor but haven't had a chance to replace it yet , and not sure which one that is anyways lol .

 

[stutaeng]

Needs to get properly diagnosed for sure.

But If could bet money, I'd probably say spider injectors or fuel pressure regulator.

But I have terrible luck, so I don't play scratch offs, LOL.

 

[east302]

A fuel pressure test would be in order. Spec is 60-66 psi with key on engine off. See if it holds or drops down quickly.

Holding the gas all the way down temporarily stops injector flow, so (wild guess) you could have a leaking injector.

Pressure test would help rule some things out.

 

[Schurkey]

Determine fuel pressure, as already stated.

Connect a scan tool, look at the data stream.

How old are the "tune-up" items? Cap, rotor, plug wires, plugs, fuel filter, etc?

 

[SUBURBAN5]

A fuel pressure test would be in order. Spec is 60-66 psi with key on engine off. See if it holds or drops down quickly.

Holding the gas all the way down temporarily stops injector flow, so (wild guess) you could have a leaking injector.

Pressure test would help rule some things out.

X2

 

[honkon]

Bank 1 sensor 3? Interesting.

 

[kennythewelder]

Fuel pressure test as stated before.

 

[Sam Bilbrey]

Determine fuel pressure, as already stated.

Connect a scan tool, look at the data stream.

How old are the "tune-up" items? Cap, rotor, plug wires, plugs, fuel filter, etc?

Hope not to sound dumb, but what is the 'scan tool' to use?

Thanks,

Sammer

 

[Schurkey]

I use a Snap-On MTG2500 with software cartridges from 1980 1/2--2006. Very similar to the more-common MT2500.

See especially Posts 14--15
http://www.automotiveforums.com/vbulletin/showthread.php?t=1146067

Other folks favor different solutions--software on a laptop computer, Chinese knockoff Tech2 scanners from eBay, etc.

 

[Dc8610]

I’m having the same issue on my 98 350 replaced spark plugs and wires, cap and rotor, ignition coil, and icm. My fuel pressure is at 60 with key on and 53-54 while running. It doesn’t hesitate at all runs good just the long crank time with door on gas pedal is where I’m stuck.