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99 Silverado hard to start when warm


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jgore43's Avatar
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March 1st, 2010, 9:59 PM   #1  
99 Silverado hard to start when warm

Hey guys,
My silverado is easy to start first thing in the morning and right after shutting down. If i let it sit after warming up, it takes 3-6 sec to start up. For the first 100k miles it was perfect. Ive already changed all filters and spark plugs,its a 5.3l v8, 2wd, ext cab. What do y'all think, i'm a relative noob to most maintenance.

 
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March 1st, 2010, 10:37 PM   #2  
What does it sound like when it doesn't start up right away? Does it just sound like it's not getting fuel or is it something else?

 
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March 2nd, 2010, 6:55 AM   #3  
Posted By: bsballfn172 What does it sound like when it doesn't start up right away? Does it just sound like it's not getting fuel or is it something else?
it sounds like its not getting fuel and its having a hard time pulling it from the tank.


Last edited by jgore43; March 2nd, 2010 at 7:10 AM.
 
bsballfn172's Avatar
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March 3rd, 2010, 7:07 AM   #4  
and it's not leaking anything anywhere?

 
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March 3rd, 2010, 9:43 AM   #5  
sounds like vapor lock, tho the vent lines are supposed to prevent that. unless evap solenoid is stuck or clogged

 
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March 3rd, 2010, 4:19 PM   #6  
I thought i 'd reword whats happening. The engine cranks a lot longer than usual, and is kind of rough starting up. Once it is going, though, the truck runs just fine. The truck operates just fine. There are no discernible performance losses or hesitation upon acceleration. Ive been perusing the Google and other forums have pointed to fuel pump. Could that be a possibility? Also there are no leaks as far as i know, will go have another look now.

 
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March 3rd, 2010, 5:26 PM   #7  
check the idle air control valve, clean it if dirty. it's mounted on the throttle body.

 
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March 4th, 2010, 5:52 PM   #8  
thanks yall , i cleaned the idle air control valve and as far as i can tell it has solved the problem, starts just like when i bought it.

 
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March 4th, 2010, 6:06 PM   #9  
glad to hear ya got it fixed. amazing what a few minutes of cleaning will do.

 
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