Slow to Start Z71

[6gear]

I have a 2000 Z71 with a 4.8 and 169K miles. This thing takes spells where you have to crank it longer than normal to get it started. Has anyone experienced this and what does it take to fix it. I haven't had the truck long but I pulled a couple of spark plugs to see how they looked which was fine, I haven't checked fuel pressure but maybe should.

[ducky]

<div class='quotetop'>QUOTE(6gear &#064; Oct 3 2006, 02&#58;45 PM) [snapback]67707[/snapback]</div>

I have a 2000 Z71 with a 4.8 and 169K miles. This thing takes spells where you have to crank it longer than normal to get it started. Has anyone experienced this and what does it take to fix it. I haven&#39;t had the truck long but I pulled a couple of spark plugs to see how they looked which was fine, I haven&#39;t checked fuel pressure but maybe should.
[/b]

Could it be fuel related? Maybe a dirty fuel filter? Bad pump? When it does run does it sound like it may have a miss?

[RedHeartbeat]

Sounds like the fuel pump is on it&#39;s last leg.

[xlr82sxs]

i had the same problem in my 98 silverado.. went two years where it took forever to start, atleast 5-10 secs at most. i wouldn&#39;t worry about it until it&#39;s an immediate problem. i dealt with this issue for two years without further problems.

good luck&#33;

[6gear]

<div class='quotetop'>QUOTE(duckysbht &#064; Oct 3 2006, 03&#58;23 PM) [snapback]67713[/snapback]</div>

Could it be fuel related? Maybe a dirty fuel filter? Bad pump? When it does run does it sound like it may have a miss?
[/b]

I changed the fuel filter a while back, the truck runs fine after it starts, no missing or surging and the problem is intermittent. Probably do as xlr82sxs says. I probably really need to check fuel pressure.

[hummertech]

when pumps start to go bad its on start up. you need 55-62 psi to start. it will run on less than that but it takes a long time for the engine to start on less. some times the pump takes longer than the 2 sec prime puls at key up to make 55-62 psi, so after the engine cranks the fuel pump starts again and the fuel pressure is slow to rise causing a extended crank. try this,,, turn the key on for 2 sec shut it off for 10 sec, surn it on for 2 sec shut it off for 10 sec, than key up and try to start the engine, that gave the fuel pump extra time to prime and if the engine starts right up, than the pump is "slow to rise". its not allways bad, but it could be going out soon.

[6gear]

<div class='quotetop'>QUOTE(hummertech &#064; Oct 6 2006, 11&#58;34 PM) [snapback]68226[/snapback]</div>

when pumps start to go bad its on start up. you need 55-62 psi to start. it will run on less than that but it takes a long time for the engine to start on less. some times the pump takes longer than the 2 sec prime puls at key up to make 55-62 psi, so after the engine cranks the fuel pump starts again and the fuel pressure is slow to rise causing a extended crank. try this,,, turn the key on for 2 sec shut it off for 10 sec, surn it on for 2 sec shut it off for 10 sec, than key up and try to start the engine, that gave the fuel pump extra time to prime and if the engine starts right up, than the pump is "slow to rise". its not allways bad, but it could be going out soon.
[/b]

This sounds like something very worthy or trying. I checked my fuel pressure it was about 58 psi, running it dropped to 48 which is what the book says it is supposed to do, I unplugged the vacuum line to the fuel pressure regulator and it would jump back up to 58 making me think the regulator and required pressure was OK. I think the only time I have this problem is just after it has run a while and gets shut off and then restarted a few minutes later.