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Rough Starts

Danny Leblanc

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April 26, 2006
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City, State
Moncton, New Brunswick Canada
Year, Model & Trim Level
91' XLT
I was doing some steep hill climbs last week and the X preformed like a champ. A few days ago my starting problem started.

When I start the truck it stumbles alittle then idles good. It only does this after sitting a few hours. There is no gas fumes or fuel leaks. It sort of sounds like its loosing its prime.

Another thing I noticed is when I turn the key to the run position (not the start position) I can not hear the fuel pump priming but it idles good once it starts.

Anyone have an idea?

Thanks
Danny
 
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mikehawk

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March 6, 2006
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City, State
South Florida
Year, Model & Trim Level
91 EB 4x4
Are you sure it's not a vacuum leak?
 
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Danny Leblanc

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City, State
Moncton, New Brunswick Canada
Year, Model & Trim Level
91' XLT
Im not sure... i'm used to working on 4.6L V8s. How would I check for a vacum leak?
 
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mikehawk

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City, State
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Year, Model & Trim Level
91 EB 4x4
Pop the hood with the engine running and listen for hissing. Make sure all the rubber lines coming off the vacuum tree on the back right side of the manifold are in good shape.

I finally tracked down a vacuum leak that was giving me problems for a while. Turns out that the hard line that runs behind the engine, down and back under the firewall is a vacuum line for the transmission valve body, and there is a short segment of rubber hose underneath the truck. Might want to check that one out if you've done some off roading and ran some shit over. Could have gotten hung up on something.
 
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unclemeat

Explorer Addict
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City, State
Richmond, VA
Year, Model & Trim Level
91 sport
I would also check the electrical plug connection to the IAC and MAF ect.
 
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Danny Leblanc

Active Member
Joined
April 26, 2006
Messages
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City, State
Moncton, New Brunswick Canada
Year, Model & Trim Level
91' XLT
I checked for vacum leak and can not find one. I also checked my IAC and MAF.
Today I got my friend to go in the truck while I laid under the gas tank. When you place the key in the run position, the fuel pump should prime right? There was no noise at all. When he placed the key in the start position, the fuel pump started to prime.

What would cause this problem?

Thanks for the help.
 
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unclemeat

Explorer Addict
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City, State
Richmond, VA
Year, Model & Trim Level
91 sport
You can replace the fuel pump relay and then try it again. They are cheap and Gen. I Xs are notorious for the fuel pump relay going bad.
 
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