99 7.3 PS Engine Cutting Out! HELP! - Diesel Forum - TheDieselStop.com
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99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the 99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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Old 03-14-2010, 08:29 AM   #1 (permalink)
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99 7.3 PS Engine Cutting Out! HELP!

Man....just found this site and I'm on cloud 9 about it. The old truck's gettin on up there in age and I'm sure I'm gonna need some help keepin her running over the next several years. On to the problem. Truck is a little hard to start in the cold. Prob a glow plug prob, not a biggie. Runs fine and smooth. Once you start driving, at around 40 to 50 mph, the engine will cut out and make a jerk (like the engine lost fuel then got it back) Jerks the vehicle pretty hard sometimes! It might do it once, it might do it 3 or 4 times within a minute. It might do it today, it might do it tomorrow. It will sometimes do it running 60 to 70 mph. Drove it 65 miles the other day and it did it about 10 times...On way back home 65 miles, never did it at all!!! I'm stumped. Any suggestions? Not trying to be cheap, but just spent a lot of $$$ on property taxes and I'm trying to solve this one at home! Thanks, David
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Old 03-14-2010, 08:51 AM   #2 (permalink)
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CAM sensor is first thing to suspect.
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99 F350 Super Duty CCLB 7.3 Auto DRW 150000 miles, multi disk converter,Hydra chip with TW tunes,ISSPRO EV2 pyro fuel trans

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1996 F350 XL PowerStroke 4X4 DRW, Auto Trans, Stock Work Dump truck, DDP down pipe,Tymar intake, 113000 miles
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Old 03-14-2010, 10:03 AM   #3 (permalink)
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I am having a simialr problem that I am try to diagnose listed in a thread "Is this a CPS problem?"

Does this sound like what its doing:

While driving down the road the truck will lose power. Check Engine Light and Water Fuel Light stay on for 1-2 seconds while the WTS Light only flashes briefly. Once you take your foot off the accelerator pedal, you hear a click and power is restored to the engine?
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Old 03-14-2010, 10:16 AM   #4 (permalink)
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Does NOT sound like CPS
Next time it does this, try using cruise control to hold speed.
If OK now then I suspect the switch on the pedal
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99 F350 Super Duty CCLB 7.3 Auto DRW 150000 miles, multi disk converter,Hydra chip with TW tunes,ISSPRO EV2 pyro fuel trans

1996 F250 XLT Ext Cab, Powerstroke, 4x4 Dana 60, Bilsteins shocks, BTS Trans, Baby Swamps,Tony Wildman Chip, AutoMeter Pyro/Trans/Boost, Tymar intake, MBRP 4 in turbo back exhaust, 209000 miles,D&B HT Starter

1996 F350 XL PowerStroke 4X4 DRW, Auto Trans, Stock Work Dump truck, DDP down pipe,Tymar intake, 113000 miles
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Old 03-14-2010, 10:25 AM   #5 (permalink)
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Yeah sounds a little like my prob. The check engine light will come on but it stays on. All other gauges read good and no other lights come on. I'm getting ready to change the oil and all filters. I know that prob won't help but it's due anyway. I can run the cruise set at about 65- 70 and it will still do it occasionaly. Could water in my fuel be a cause? Thought about running some treatment anyway through it. If it is the CAM sensor, is that something I can purchase and change myself? Can it be tested to see if it's the problem? Thanks for all the info and help!
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Old 03-14-2010, 02:22 PM   #6 (permalink)
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If the check engine light comes on and stays on, it should have set a code. Get a code reader that can read for the Powerstokes to see what code was set.
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Old 03-14-2010, 09:00 PM   #7 (permalink)
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My truck did that and it was the CPS...
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Old 03-14-2010, 10:12 PM   #8 (permalink)
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I just went thru this it is the cam sensor, No question some cut out like
the one in your truck and some will kill it for a few min then start back up
and some die and never come back.
Replace the CPS all will be good.
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Old 04-22-2011, 08:42 PM   #9 (permalink)
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Mine is doing the same. Had the cruise set and it cut out, engine light came on and stayed on and chugged and then kept going. After doing that 3 times, it stalled and then would not start. after 3-4 minutes it started right up and engine light off. Then chugged 3 mores times and engine light stayed on.

Is CPS the CAM sensor? Is that something a backyard mechanic can do?

Thanks
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Old 04-23-2011, 07:39 AM   #10 (permalink)
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A year ago when this happend on my truck, I thought it might have been the CPS, but noticed that the engine would cut out when I would hit a bump in the road or hard right turns. It turned out to be an exposed wire on the wire harness that was shorting out. I found it on the main driver side valve cover wire harness near the bracket for the air intake tube. Wasn't easy to find, but a simple splice job fixed it right up.

Hope this help you.
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