HTO'S BRONCO BUILD

[hobbyturnedobsession]

Ok, I'll definately check it out. Thank you. I'm goin to throw a pressure gauge on it tonight. Here was something that Andy noticed too. When we were checking for fuel pressure, he pressed the shrader valve on the fuel rail and air came out before fuel spirted. Can anyone take a guess why?

[yikes]

Ok, I'll definately check it out. Thank you. I'm goin to throw a pressure gauge on it tonight. Here was something that Andy noticed too. When we were checking for fuel pressure, he pressed the shrader valve on the fuel rail and air came out before fuel spirted. Can anyone take a guess why?

The injectors were clogged open and drained the rails?

[hobbyturnedobsession]

Hmmmmm ok that kind of makes sense, seeing that there was a really rich smell when we were messing with it on the trail.... The ecm controls that correct?

[philofab]

The "air" in the lines could actually be fuel vapor. You have to remember that gasoline can boil at as low as 100 F due to additives. 1lb of fuel pressure raises the boiling point between 1-2 degrees F.

A modern fuel injection systems normally has about 40-50 psi of pressure and circulates to keep fuel cool. Anywhere heat can soak the lines will increse the overall tempature of the fuel. Unless you have routed your exhaust extremely close to a fuel line it is unlikely to be your problem. Headers actually run cooler than manifolds due to less restriction, you also have no inner fender wells so hot air escapes sooner.

[hobbyturnedobsession]

So I should check my fuel pressure then? The vapor I always thought to be bad at the fuel rails.

[Silverslk]

The "air" in the lines could actually be fuel vapor. You have to remember that gasoline can boil at as low as 100 F due to additives. 1lb of fuel pressure raises the boiling point between 1-2 degrees F.

A modern fuel injection systems normally has about 40-50 psi of pressure and circulates to keep fuel cool. Anywhere heat can soak the lines will increse the overall tempature of the fuel. Unless you have routed your exhaust extremely close to a fuel line it is unlikely to be your problem. Headers actually run cooler than manifolds due to less restriction, you also have no inner fender wells so hot air escapes sooner.

Bill was saying all his symptoms sounded like vapor lock. Makes sense, once it cools down, it runs fine and driving on freeway it does OK but heat of the day, beating on it in Baja (low air flow and constant throttle) allows the headers to heat the fuel line. Said he had a factory built 4wd lightning that did same thing with headers.

How did it do Sunday morning?

[hobbyturnedobsession]

It did ok, fumbled a bit. Anything below 1700 rpms and it would act up. We were going through the hilly portions too. If it was down hill and I wasn't hard on the throttle it did fine. Up hill coming out of San Diego I started loosing power, and at 75 mph it ran 5 degrees hotter than at 70. Wouldn't the motor running lean cause it to heat up a bit?

[philofab]

I would check presure while the problem has presented itself. Low voltage at the pump will create the same problem.

[hobbyturnedobsession]

What would cause low voltage at the pump?

[hobbyturnedobsession]

I just read something. My evap line runs to my intake. I heard if the tank is topped off it can cause vapor lock and take days to undo. Could this be my problem? I will just unhook it. I was shaking around alot.

[hobbyturnedobsession]

Okay so an update. I threw a code finally, a 327 which is a low voltage to the evp sensor. I replaced it. Still nothing different. Then I replaced the cap rotor and coil because I have yet to do it. I ended up with msd stuff because it was slightly more than duralast and alot of people have had good luck with it. It did a wee better but still issues. I threw a fuel pressure gauge on it and sure enough 25 lbs. Then I hit it up and it fluddered from 40 to 18 and when I shut the truck off it dropped 5 lbs in just over 10 seconds. So I ordered a new fuel pump (carter) and a new fuel pressure regulator. We'll see what happens.

[Silverslk]

Glad to hear you are making progress!!

[hobbyturnedobsession]

Thanks man! I also found a bad throttle cable so I ordered on with the rest on rockauto.com. How fast is their shipping?

[Silverslk]

Rockauto is hit and miss on shipping. Some stuff comes quick others.....not so much. I buy from autopartsplace.com whenever possible. If I order on monday before noon, I usually have it tuesday!!

[hobbyturnedobsession]

Alright. Well nothing was on back order so I'm hoping for the best! I'll find out today if/ when it comes.

[hobbyturnedobsession]

Well success!!!! I replaced the throttle cable, and that was for my own preference. Then I replaced the fuel pressure regulator and the fluttering stopped. Then I got my fuel pump and replaced that last night. I'm back to barking the tires!

[ChaseTruck754]

Good to hear!

[hobbyturnedobsession]

thank you! I'm in the midst of cutting out the floor now. I know I did it bass ackwards but I didn't have a grinder at the time.

[BajaF250]

thank you! I'm in the midst of cutting out the floor now. I know I did it bass ackwards but I didn't have a grinder at the time.

I truly think this will be one of your best investments in time and you'll truly thank yourself when you use it! I love mine!

Fantastic news on getting the problem sorted out. It's always such a huge win when you get a difficult problem figured out and then repaired.

Sounds like you and Carly are ready for the next epic adventure! COOL BEANS!

[hobbyturnedobsession]

Yes sir! I'm also going through the hack job of the po, on top of my quick fix its. Its a mess but its getting better. She and I am definately going next time, and I will be better prepared. I destroyed my tool box on the last trip.