Ford F-150 (2004-2008) :: 2005 - Intermittent Sputtering While Driving
Jul 23, 2011
It started completely unexpectedly about a month ago when I was driving around 70kmh while cruising. I would get a few "jerks" of a sputter, then was able to drive a km or 2 before it did it again. I drove to a friends and he got in, and the sputtering episode was over.
Since then, I cannot simulate the way I was driving to make it sputter for any mechanic, but I have been getting sputter on and off the last month.
The one time I got in the truck and started it, put the truck in drive, and it sputtered for a few seconds. I wasnt driving at all this time. This was the only time It sputtered in a stading position.
Here are a few points to maybe, narrow down what happens.
-I am usually driving around 70-90kmh
-I am usually under no loads (not towing, hauling etc).
-My mileage seems to be getting worse.
-this was normally happening not only when the engine was warm, but when it was warm outside and I was driving it for a longer period.
-When I started driving my truck I calculated around 16mpg city. I am currently getting around 13-14. I was on the hiway for around 250 km and got 14mpg. Seems I get better mileage when puttering through the city than when I am on the highway.
I had the truck in to a dealer 2 weeks ago. They did an injector flush, new sparkies, number 5 coil, and took me for $780, saying the problem is fixed.
A few days ago, I was driving on the onramp to the highway accelerating around 90kmh and for around 4-5 seconds I was sputtering and jerking so bad I thought I was done for. The truck finally recovered and again, haven't had any episodes since.
The dealership says their electrician doesn't know what to do, and would need my truck for 4-5 days to try to see the problem for himself. I can only think, as a non-mechanic, that it is something to do with some sensor, possibly a fuel, and/or oxygen sensor.
2005 F-150
4.6
88000km
gas
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I have power to FPDM and I have the diagram for the plug but how can I test (hotwire) the Fuel Pump without lowering the fuel tank? What should be the voltage coming from the FPDM plug? not sure about pin 1 & 6.
How can I test the FRP sensor? what are the specs for voltage?
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I have cleaned the maf, put in new air filter and fuel filter. And put in a new battery. Would a coil act like that? Maybe plugs? Or a vacuum leak?
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By the way, my truck model is the 2005 F150 XLT TRITON.
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Here is a vid of the noise : 05 f150 - YouTube....
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Anyways, a few weeks ago it began to lose power and I suspected that the PCM was retarding the timing for some reason. Before I could get to the shop, the thing went nuts on me at 75mph. Started shaking and sputtering and throwing cel codes. I shut it down and after 5 minutes re-started. It seemed fine and actually was running a bit better. Took it in and the code was the 0302. #2 cyl misfire.
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I have a rearview aftermarket camera, I took it off and mounted it several locations to view tires. The fronts are steady while at freeway speed and with the vibration.
After tie rods were changed and no play in any suspension/steering parts, the truck has been aligned several times. Tires are new and have been balanced twice. The driveshaft is new (new U-Joints, shaft and slip yoke) and is balanced, which it did improve the vibration but not perfect. The rear brakes have been inspected, no sign of overheating on the drum or the shoes. The lever is all the way back. So I don't believe it is it, although I did not fully disconnect the cabling. If it was the brakes why would it be intermittent? I had a shop replace all bearings in the rear axle, due to the pinon bearing noise. I saw the TSB's already on vibrations and none conform to my situation. The hubs have been checked, with the engine on they are unlocked.
So as I stated I can't say for sure it started after the lift but maybe due to the lift the differential pinion angle to driveshaft and to the transfer case is too high. Maybe I need some pinion shims. But I haven't heard of anything else needed to do this after a 2-3in lift. I'm getting tired of chasing this vibration.
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Intermittent starting issue in these things? Seems to be getting more common for me this winter. Turn the key, it turns over, and then I let go of the key and she doesn't light. Then when I try again, it's like the engine is flooded. I have to give it gas to start, which I know is a no-no in fuel injected vehicles. Other than that, it's fine. No sputters, no hiccups, runs strong, good mpg, etc. But I'm getting annoyed....
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