start up problems

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May 31, 2009 | 04:14 PM

bla1879

Thread Starter

Fleet Mechanic

Joined: Mar 2007

Posts: 1,398

Likes: 1

From: Simi Valley, CA

start up problems

whats up guys the truck im talking about is the one in my sig.

So recently i have been having problems starting my truck. When i go to start it after it has been sitting for a bit of time, over night or several hours while im at a movie or something, when i start it it does one of two things.

it either starts and then a half second later drop super low in rpms, nearly stalls then catches itself and is fine the rest of the time im driving it. After the initial problem it has no problems or any kinds of signs of problems.

or

at the start it catches, turns over and runs for a brief moment and then just like senario 1 its rpms drop rather quickly and it completely stalls out. IF this happens i then have to crank it again, which takes longer than normal to start and then i have to remain on the gas for several min to keep it from stalling out again.

Anybody have a clue what is going on and can help me out for this?

thanks guys

Jun 1, 2009 | 08:16 AM

MikeD1980

Freshman User

Joined: Apr 2009

Posts: 37

Likes: 0

sounds like fuel pump is bleeding off pressure, which it shouldn't do, meaning a new fuel pump is probably going to be needed. might wanna try a new fuel filter first though.

Jun 1, 2009 | 08:29 AM

MIKE 04 GT

Senior User

Joined: Jul 2008

Posts: 183

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From: south carolina

try to clean the iac i thank that is what it is called

Jun 1, 2009 | 01:04 PM

KingRanchMan02

Posting Guru

Joined: Oct 2005

Posts: 2,209

Likes: 1

From: Louisville, Kentucky

Replace the IAC valve. Good luck!

Jun 1, 2009 | 08:12 PM

bla1879

Thread Starter

Fleet Mechanic

Joined: Mar 2007

Posts: 1,398

Likes: 1

From: Simi Valley, CA

thanks guys. unfortunately it hasn't been doing it today so im not sure what is going on

Jun 2, 2009 | 06:55 AM

MIKE 04 GT

Senior User

Joined: Jul 2008

Posts: 183

Likes: 0

From: south carolina

i dont know alot about this but would you have to replace the iac or could you just clean it.

Jun 2, 2009 | 07:31 AM

MikeD1980

Freshman User

Joined: Apr 2009

Posts: 37

Likes: 0

it can be cleaned. there is a how-to somewhere around here. I just pulled mine and used brake cleaner and throttle body cleaner and cleaned that and my throttle body out and put it back together to fix a bad idle, but this is a starting problem and I still think it is a fuel pump bleeding off pressure because it is a starting problem.