no start when hot.

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Charles Musick

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1999 5.4 EB. Truck runs great.
Problem when the truck gets hot it will not restart is if sits for 5 minutes. It will, if i restart immediately. After the 5 minutes, it will start, idle very rough, starve for gas. Press the gas and it takes in to much air killing the engine. Finally it acts like it runs out of fuel and will not restart untill it cools. I have now noticed the smell of gas. My thoughts were fuel pump, untill the gas smell. I've changed the filter, plugs, fixed vacum leaks. I need to do a pressure test on fuel. Think it may be fuel regulator? I didn't think it would be the hot starter issue because it will start - run for a minute, after that it will crank but nothing on fire.
 
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Charles Musick

Charles Musick

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Forgot to mention this has been going on for a while. I checked the o2 sensor on driver side upflow. Couldn't get other side out. Autozone test showed pvc and o2 however after changing the plugs the o2 reread good. I also homed the top plug coil and they tested good, however i only have the problem when motor is hot, so is that a true test.
 
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stamp11127

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Get the facts instead of guessing at the problem. Fuel pressure is one thing I would check. I think the min running is 35psi. They usually run like crap in the high 20's and lower.
 

docraymund

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It may be a leaking fuel injector/s or a loose vacuum connector on the fuel pressure regulator. You should do an injector balance test.
 
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Charles Musick

Charles Musick

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Get the facts instead of guessing at the problem. Fuel pressure is one thing I would check. I think the min running is 35psi. They usually run like crap in the high 20's and lower.

Thanks, minus the "get the facts" comment. Searously what's up with that. Take it to a garage for test? Test the fuel pressure? I plan on testing the pressure, I thought others may have had the same problem and.....
I have not done anything to the truck that didn't need to be fixed, so I'm not simply guessing.
 
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Charles Musick

Charles Musick

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It may be a leaking fuel injector/s or a loose vacuum connector on the fuel pressure regulator. You should do an injector balance test.
This is a bit crazy, but if I pump the brakes while starting it will start (while hot). Thinking it has something to do with vacum.
 

Bedrck47

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What is meant by get the facts is when I see your original post it appears you are guessing

"My thoughts were fuel pump"
"Think it may be fuel regulator"

By get the facts means test and be sure Check for fuel pressure and report the reading Check for voltage etc.


The more information (facts) you provide will result in better answers and not members also guessing.

Thinking others may have had the same problem doesn't mean what was the fix for them will be the same fix for you.
 
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Charles Musick

Charles Musick

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Agreed on the fuel pressure test. I'm going to do that this weekend.
If i understand correct
Facts: that commonly cause this problem.
Bad Coil on plug . Bench test ohm. Done.
Bad o2 sensor. Ohm heat test. Done
Bad Vacum line. Done but need rechecked.
Hot starter pulling to much power. Simi ruled out because it will start just won't run. Once the cranking stops the starter shouldn't pull power. correct?
Fuel filter, changed.
Fuel pump needs pressure test.
So other items that may cause this issue that I should check this weekend. In case it's not the full pump. Also if there a good bench test I can preform. I don't really have money to spend at the garage.
 
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Charles Musick

Charles Musick

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What is meant by get the facts is when I see your original post it appears you are guessing

"My thoughts were fuel pump"
"Think it may be fuel regulator"

By get the facts means test and be sure Check for fuel pressure and report the reading Check for voltage etc.


The more information (facts) you provide will result in better answers and not members also guessing.

Thinking others may have had the same problem doesn't mean what was the fix for them will be the same fix for you.

I understand what your saying, however not completely true. They are know issues that can cause this problem. There are also many ford owners with the same problems, same fix. Maybe not in this case, but how do I know unless I ask. How may owners have had rear control arms rust out. Same problem same fix.
 

Bedrck47

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You may want to test fuel pressure when you have the no start condition Its possible that you have good fuel pressure when cold but something could be causing low fuel pressure when hot. This may not be happening but needs to be ruled out

How many miles are on the expy??
 
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