Miss in engine

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Feb 28, 2008 | 05:45 PM

johnrogers

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Miss in engine

Hello, I am in a at a stand still with my ford F350 with a 460 engine. After changing inline fuel filter, new spark plugs, spark plug wires, coil, taken it to 4 mechanics and still have a miss when under pressure (pulling my 5th wheel) Does any body have an Idea what it might be?
all help and comments will be appreciated.
John

Feb 28, 2008 | 05:48 PM

redford

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From: Stephensville WI

Oh yes.

You probably have a clogged catalytic converter. Disconnect it and take your truck for a spin. You'll know right away if this is the problem.

Feb 28, 2008 | 05:48 PM

reddogracing

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seems to easy, but mine did same. Did not notice miss at idle only under load. Seemed Ok other then that. I crossed two plug wires. Guess they were close enough that it only showed under pressure, worth a check anyhow.

Feb 29, 2008 | 07:10 AM

johnrogers

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thank you I will try, better than removing the fuel tank to check the fuel pump

Feb 29, 2008 | 09:48 AM

krewat

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Quote:

Originally Posted by johnrogers

thank you I will try, better than removing the fuel tank to check the fuel pump

Just get a fuel pressure gauge with a long enough hose, and drive it with the trailer on it and watch the pressure when it starts to miss. You don't need to drop the tank

I'd also check the MAF if you have one - cleaning it might be in order.

Feb 29, 2008 | 10:11 AM

johnrogers

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miss in engine

Do you put the hose in the gas tank? we have dual, which one if thats how it's done. Will that tell me if its the fuel pump?

Feb 29, 2008 | 10:22 AM

krewat

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There is a schrader valve (tire valve) on the fuel rail on the engine - you hook up a fuel pressure gauge to it to check what the fuel pressure is. If you get one with a long-enough hose, you can slip it under the wiper arm, and drive around with it in plain sight.

That way, when it's missing, you can see if the fuel pressure is too low.

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Feb 29, 2008 | 01:15 PM

redford

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From: Stephensville WI

It's probably not the fuel pump, since you have 2. Switching to the other would make the problem go away if it was a fuel pump.

It could possibly be the fuel filter.