light sputtering? - Ford Powerstroke Diesel Forum

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post #1 of 65 Old 10-06-2011, 07:58 PM Thread Starter
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light sputtering?

so under normal driving, cruising with steady throttle at around 1.5k rpm's the truck seems to be slightly sputtering, like a miss. but if im in the throttle it drives 100%. idles perfect all day. truck is a 94.5 with 115k miles.

and also i dont know if its related, the truck starts right up but lopes 4-5 times. doesnt matter if the motor is cold or warmed up. HPOP is fairly new. please help me out.

Last edited by tony0713; 10-06-2011 at 08:17 PM.
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post #2 of 65 Old 10-06-2011, 08:10 PM
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Have you ever changed the cps out? Maybe check the electric plugs that go into the head that run the injectors and glowplugs. After that I would guess the APPS (acelerator pedal position sensor). Also might want to check the fuel pressure.

Allen
1999.5 F-350 7.3, six-speed

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post #3 of 65 Old 10-06-2011, 08:15 PM Thread Starter
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cam position sensor? no

check the plugs? for corrosion?
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post #4 of 65 Old 10-06-2011, 08:17 PM
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Yeah, pull them apart, look for corrosion, make sure nothing looks melted, and they are nice and tight.

Allen
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post #5 of 65 Old 10-06-2011, 08:19 PM Thread Starter
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ill try that and maybe a new cps tomorrow. where is that sensor located, on the back of the motor like some ford gas motors?
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post #6 of 65 Old 10-06-2011, 08:23 PM
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No, its up on the front cover, above the crank pully, pointing toward the passenger side. If you are going to get a new CPS make sure you get a ford one. If it hasn't been recalled you may even get it for free. I forget which color is the "new" good sensor, but it you get it from a dealership you should get the right one.

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post #7 of 65 Old 10-06-2011, 09:09 PM Thread Starter
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what is so important about the ford sensor vs aftermarket?
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post #8 of 65 Old 10-06-2011, 09:14 PM
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Most others arn't as good quality and don't last as long as the ford sensor, and may not be read by the PCM as well.

Allen
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post #9 of 65 Old 10-07-2011, 03:36 PM Thread Starter
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so put the new CPS from ford with no improvement. the two external plugs on top of the valve cover looked good. scanned it and came up with PO603 and PO476.
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post #10 of 65 Old 10-07-2011, 04:53 PM
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The P0603 code has to to with the keep alive memory. So basically if you had the batteried unhooked for a bit it will set the code. AKA not a big deal.

The p0476 also won't cause any problem. It is exhaust back pressure code, so your sensor and tube are cloged up with soot. Search exhaust pressure sensor cleaning and you'll find plenty of info on it.

My next guess would be the APPS.

Allen
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