A 460 engine that acts like its not getting enough fuel. Will start but runs as if only on half the cylinders missing badly or such.

Big fire hazard, check all the connections to the fuel system.

Surges under load but only while going uphill Page1 - Chevy High ...

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Mar 6, 2011 - 14 posts - ‎8 authors
Trying to help out a friend. ... The truck starts, runs, and drives fine until you get to a hill. When going up hill it begins to surge, almost stalling but not quite. ... rubber fuel lines suck shut under a heavy load and act like that. .... tranny fluid level o.k.? ya got me stumped. runs great when it's on a flat surface?

Ford 460 engine - RV mechanic

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Will not take gas going up a hill but will maintain speed at 55 mph. ... Want to do a diagnostic test on my 1997 F250 with 460 engine. ... only get to about 40 miles an hour if i push it the engine acts like its running out of gas,thank you .... The truck hesitates on acceleration, while driving on flat surface is fine, however climbing ...

rough idle, stalling, loss of power. - CarGurus

was it running this way before you changed the plugs? just a shot in the dark here possibly a defective spark plug, rare but not impossible. if it was running fine before changing them. Other wise I would take it to autozone and pull codes if it is P0350 #5 misfire we would use the process fuel, fire and compression. is there any engine coolant around any cylinders? Have you checked the coil packs? could be a bad coil pack. if no evidence of fluid around them proceeded to check for spark, fuel then compression. post back results or new post with more deductions. iis it no spark no fuel or bad compression.

Is the gas getting to the engine? First try swapping the fuel pump relay with any similar one in the car. If ti starts and runs the relay is bad. If not check the ASD relay, if you have one. If its bad it also will not start. Next pull the fuel line off at the intake manifold, place in a container, crank engine is fuel coming and good fuel flow? If OK, check air filter not clogged. All OK, verify sparks at all cylinders.

You did not supply the year of the engine. Many defects are picked up by the self-diagnostics in models which have self-diagnostics.

You may not notice that the engine is still missing at higher speeds. One of the tests that can be run is a cylinder-balance test. This electronic test systematically disables individual cylinders and shows how much power each cylinder is contributing to engine power. It will pinpoint the problem cylinder.

It is a lot easier than removing each plug to examine misfires. A Noid light is a tester for fuel injector harnesses. A Ohmmeter can test the fuel injector for continuity.

Once you get a cylinder balance test, it will reduce the testing time and you can concentrate on 1 cylinder.

Ignition or fuel problem probably . When you turn the key to start does the engine spin ? Crank no start or nothing happens NO CRANK - NO START ?
If the engine spins an does not start an run you need to test to see what's missing Spark or fuel . Pull a spark plug wire off a spark plug an stick a screw driver in the end an hold it near ground (metal) and have someone try to start the vehicle ! Is there spark ? Spray starting fluid into the engine , does it start then ?
Videos on youtube showing how to do these tests

I'm going to assume you have the 3.4 V6 engine which uses direct ignition with a coil on each plug.
Could be ignition or fuel related.
A weak spark/coil will allow the engine to run on all 6 cylinders at idle but miss under load, especially when going into overdrive at 45 mph. Not enough spark to jump the gap.
Same thing with low fuel pressure or dirty injectors. Not enough fuel when the engine is working hard.
Usually when you get a hard miss you will get a trouble code for the cylinder that is not giving power.
Have you changed the fuel filter in the past 12 months ?

It sounds like and ignition module is failing periodically and must be replaced, when the engine reaches a certain temperature threshold the electrical component arc out from the silicon sealant that encases the capacitance discharge component.

Hello. katienjoe. the fuel line from the filter to the fuel rail has a restrictor in the line its at the fitting at the rail. the opening messures 3/16 of a inch. so loaded it doesn't pull above 50 mph. you can change the line I did on mine the hot rod shops can supply what you need.

could be a durty fuel injactor or fuel pump going bad also ford has an issue with mass air meters