Shuts down after hard throttle - Ford Powerstroke Diesel Forum
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post #1 of 5 Old 12-29-2012, 10:18 PM Thread Starter
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Shuts down after hard throttle

Still trying to learn this new truck and don't really have another to compare to. One issue is if I get it on real hard, throttle to the floor and get the rpms up then let off the throttle, it just dies. Is this normal or not?

Kevin
96 F350 7.3L CC SRW 4x4 PSD
Automatic, 4.10 gears
263,000 miles
NW Washington
6637 DIY Filter
BB Mod
Swamps IDM
3" downpipe and 4" AFE straight pipe (with muffler)
TS 6pos chip
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post #2 of 5 Old 12-31-2012, 07:54 AM
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I would say, "not." Things like this trigger my primary troubleshooting question: If it did this off the showroom floor, would ANYONE buy one?!

The only time I've had my engine quit on me after throttle is in two instances:

1) Running low on oil. No oil means no pressure from the HPOP means no injector firing means engine no run. Coast to the side, dump in another gallon (always kept at least two with me), crank for a bit, she choppily starts, and off we go.

TIP: Don't ignore little oil leaks, they can become massive in no time! In my case, it was the turbo pedestal o-rings AND the EBPV. I went through at least a gallon of oil between fuel stops.

2) Running low on fuel, or water in fuel. I had a shop 'work' on my baby, and all they did was let her idle forever while they looked for a fuel leak, which only showed up under pressures seen while driving. After picking her up, I ran out of fuel on the way home, and I'd left it with a quarter tank! Several times before she died completely, she'd die whenever I shifted unless I kept my foot on the throttle.

Beyond that, I could only suspect a PCM or injector issue, but I'll leave that to someone with more knowledge about those subjects than I.

Good luck, don't forget to post up when you find out what causes it!

Nick

1995 F250 XLT 7.3T (on donor '97 engine with 180xxx miles) 4x4 - LuK SMF, Diamond Eye 3" downpipe to 5"straight-pipe exhaust. ZF5 manual trans, Curt hide-away gooseneck hitch, Super Duty suspension conversion.

1997 F250 XLT 7.3T - 2wd E4OD, alloy wheels w/ bald tires, gooseneck hitch, pretty much bone stock. Soon to become a trailer, spare tires, spare parts, and scrap.
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post #3 of 5 Old 12-31-2012, 09:03 AM Thread Starter
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Thanks for the input Nick. I just did an oil change and oil is at good level. Read the forever long discussion on top end oil, so today I am going to check mine to see if it recirculated and changed the top like the schematics say it should. Anyway, it is running on new fuel, but don't know if that place sells alot of fuel, so I don't know the trust worthiness of it. With 263K miles on her, I doubt anyone put money into the injectors, and I will be doing new Orings on the injectors as well as new GPs here within the week. This is probably the cause of my blue smoke at start up, and also blue smoke on pushing the go pedal down hard while in motion. I will eventually reseal everything being this is my project truck, but I am looking for inputs to take care of things before others. Right now the line up looks like injector orings and GPs, then tranny fluid and filter change, rear end fluid change, turbo reseal and if there are any signs of leaks on the HPOP, that will get resealed too, if not, not going to mess with it.
Any suggestions anyone?

Kevin
96 F350 7.3L CC SRW 4x4 PSD
Automatic, 4.10 gears
263,000 miles
NW Washington
6637 DIY Filter
BB Mod
Swamps IDM
3" downpipe and 4" AFE straight pipe (with muffler)
TS 6pos chip
EBPV wired to a switch
Kenwood Stereo System with 10"sub
Pyle Alarm System
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post #4 of 5 Old 12-31-2012, 09:08 AM
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Just a guess, I would try compression test and /or blow by (turn oil filler upside down at idle and see if it'll stay.)

What this nation needs is cleaner thoughts and dirtier fingernails...
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post #5 of 5 Old 12-31-2012, 11:06 AM Thread Starter
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Did a blow by test, flipped the oil filler cap upside down. Very light air pushing up out of the hole, not enough to move the cap. ( I could barely feel it on my hand) Did a cold start today at 32 degrees. It puffed a blue cloud then went to a faint blue chug smelling of diesel. Now after it is up to op temp, it starts fine and no smoke. When I throttle hard on the move it let out a faint blue cloud. No other running problems. After doing research, looks like probably just need to put new seals on the injectors and new GPs. Again, she has 260K and probably no maintenance from PO. Any comments, suggestions? Thanks for all the inputs guys. Still don't know why she shuts down after a hard throttle, have to do more tests to get more accurate info on it.

Kevin
96 F350 7.3L CC SRW 4x4 PSD
Automatic, 4.10 gears
263,000 miles
NW Washington
6637 DIY Filter
BB Mod
Swamps IDM
3" downpipe and 4" AFE straight pipe (with muffler)
TS 6pos chip
EBPV wired to a switch
Kenwood Stereo System with 10"sub
Pyle Alarm System
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