Need some diagnostic help

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Need some diagnostic help

Post  TheFrog on August 16th 2012, 8:32 pm

Hey guys, finally got the 460 running and drivable. Took it to the muffler shop (about 7 mile drive) with no problems. Got the new exhaust put on and it sounds great. If you want to hear and see the car go to Youtube and type in Coffin Muffler on a Ford Galaxie.
Anyway, I picked it up from the muffler shop and drove it about 3 miles and all of a sudden the motor bogged down then started stuttering and finally quit. To make sure it wasn't a fluke I went ahead and fired it back up and drove it another 2 miles and the samething happened. Tried again and got 1 mile and it happened again. Finally just got it towed home and haven't messed with it since.
Do you guys have any ideas of what this might be? I know its vague but those are the symptoms.
Thanks,
Keith

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Re: Need some diagnostic help

Post  TRUKPULR on August 16th 2012, 8:56 pm

OK I viewed the video. It looks like they just about coughed the pipes off going over the tranny cross member.



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Re: Need some diagnostic help

Post  bbf-falcon on August 16th 2012, 9:16 pm

Not much info but I guess would check fuel filter first. After it stops,check and see if you have any fuel in the bowls.

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Re: Need some diagnostic help

Post  LivermoreDave on August 16th 2012, 9:46 pm

As difficult as it may be, I must agree with Rick's diagnosis. Replace the filter a give her a spin. Has the vehicle been sitting, rust in the tank or the fuel system ? Could the pump be going bad ? Can you mount a temporary fuel pressure gauge on the cowl for monitoring ?

Dave.

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Re: Need some diagnostic help

Post  TheFrog on August 17th 2012, 12:02 pm

Hey guys, thanks for the replies.
The fuel pump is new. I also checked my inline fuel filter to make sure it had fuel in it and it does. I did notice that the fuel has a brownish tint to it. I think there might be rust in my fuel. The tank is stock but I just cleaned it out with a rust kit. Maybe I didn't get it clean enough? Maybe I should just get a new tank?
If it is rusty fuel causing the problem, why do the symptoms take so long to present themselves?
Dan, what does "coughed the pipes off" mean? Does that mean my exhaust vapors are getting stuck? Could that be causing the problem? If so, that would explain why the symptoms didn't start until after getting the exhaust system installed.
Let me know guys
Thanks,
Keith

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Re: Need some diagnostic help

Post  TRUKPULR on August 17th 2012, 2:33 pm

Well What I seen was when they bent the tubing to go over the Tranny Cross member it looked like it got squished not formed Say you have 2" pipes if they squished them are they still 2".. Could be a flow issue. not to mention those mufflers.. yes they fit under the car nice, but I'd like to have the exhaust exit from out side the body lines .


Dan



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Re: Need some diagnostic help

Post  69F100 on August 17th 2012, 3:33 pm

also check and make sure they didn't smash the gas line when they picked the car up to install the exhaust
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Re: Need some diagnostic help

Post  TheFrog on August 17th 2012, 4:29 pm

Hmm, I'm gonna' get right on this and call up the muffler guys.

You're right, I liken exhaust pipes to straws. If you try blowing out of a straw that is pinched, your air just comes right back into your mouth. I can't imagine an engine would run well if at all with exhaust vapors staying in the combustion chambers.

Yeah, the mufflers tucked up under the car were just personal preference. I like the clean look of the exhaust being hidden. Having the mufflers under the car wouldn't restrict exhaust vapor flow though, would it?

Thanks,
Keith

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Re: Need some diagnostic help

Post  TRUKPULR on August 17th 2012, 5:47 pm

69F100 wrote:also check and make sure they didn't smash the gas line when they picked the car up to install the exhaust


Oh YA Now here's something I didn't even think of ....



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Re: Need some diagnostic help

Post  TheFrog on August 17th 2012, 10:38 pm

Went ahead and check the gas for cleanliness and found that not only does my gas look like apple juice, there are also a bunch of black specs in it. Think that may be the problem?
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Keith

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Re: Need some diagnostic help

Post  bbf-falcon on August 18th 2012, 6:48 am

[quote="LivermoreDave"]As difficult as it may be, I must agree with Rick's diagnosis. Dave.

Whats that statement mean Dave Shocked Exclamation

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Re: Need some diagnostic help

Post  jasonf on August 18th 2012, 6:57 am

Also check to make sure they didn't route the exhaust right next to the fuel pump. Maybe it is getting hot and quitting (assuming you have an electric pump).
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Re: Need some diagnostic help

Post  norm on August 18th 2012, 7:12 am

i had a similar problem once and it was the fiber screen on the pick up tube in the fuel tank.it was collapsing under the "suction" and after it was shut off for a while it would expand back out and run for a while.
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Re: Need some diagnostic help

Post  TheFrog on August 28th 2012, 3:36 pm

Alright, dropped the tank to have it cleaned and flushed. Hopefully I'll get clean gas moving through once I reinstall that.

Had a buddy come by and help me take apart and clean the carb and found a bunch of muck in the bottom of the resevoirs. He also noticed that I did not have my choke valve hooked to anything so its possible that when I got on it leaving the shop the valve closed shut and kill the engine. I went ahead and took care of that as well.

The fuel line is kind of close to the exhaust manifolds but I don't think the fuel is vaporizing at that point since I have fuel in the inline fuel filter which is after that point. I'm not running an electric fuel pump.

When I get the fuel tank back I'll pull the sending unit to make sure the fiber screen is working properly. After that I'm going to put clean fuel into the tank and flush the lines all the way up to the carb using the fuel pump until I get clean fuel coming out.

Anyway, if there's anything else you guys can think of let me know.
Thanks,
Keith

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