truck dies when I try to accelerate

sleeps · Aug 15, 2015

97 7.3 will sit and idle perfectly. If you try to get going even slower than normal it Will die. Any idea what's going on? Just changed the fuel filter to see if that was it and it's doing the same thing.

Happened over 20 miles and putted it home the first day it happened with ice sensor unplugged then later that day after it sat at the house I plugged it back up and the truck ran fantastic for that day. Next day and everyday for a week since then the same issue.

Rideracelivemx7 · Aug 15, 2015

Does it shut off like you hit the key or stumble out?

2015sixohno · Aug 15, 2015

Faulty mechanical lift pump in the valley is the more likely culprit.

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Magnum PD · Aug 15, 2015

Fuel in the valley?

sleeps · Aug 15, 2015

Rideracelivemx7 said:
Does it shut off like you hit the key or stumble out?

Like I shut the key off. And while still coasting put it in neutral and will fire right back up.

sleeps · Aug 15, 2015

Magnum PD said:
Fuel in the valley?

Any specific spot? I didn't think to check but now I've spilled my own fuel in the valley overflowing from changing the filter.or would it be alot of fuel?

79jasper · Aug 16, 2015

Or junk in the fuel lines or selector valve. (If applicable) like the tank pickup screens.
Also check the IPR nut.

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gnxtc2 · Aug 16, 2015

CPS

Billy T.
[email protected]

Powerstroke Man 6.4 · Aug 16, 2015

gnxtc2 said:
CPS

Billy T.
[email protected]

^ WHS I was thinking the same.

sleeps · Aug 16, 2015

Truck cranked and idled yesterday. Today it turns over but won't start at all.

Magnum PD · Aug 16, 2015

Tach move?

sleeps · Aug 16, 2015

Magnum PD said:
Tach move?

Yes. And I'm getting 172 cranking rpms according to my edge insight.

ghohouston · Aug 16, 2015

I think you need like 150 rpm's or so. I'd swap the cps out.

sleeps · Aug 16, 2015

I have over 150 rpms.

Well...changed the oil and filter and it didn't crank up. Figured maybe it had old thin oil or too low. So I unplugged the icp sensor again just to see and it cranked up. 580psi icp at idle . Plugged icp back in, same way it was 5 minutes ago and didn't touch a thing and it cranked up again where it wouldn't crank before.

Still won't let me give it throttle without shutting off. Will idle though.

gnxtc2 · Aug 16, 2015

I know if the IVS is bad, the truck will just idle; you'll have no throttle response. Don't know if a bad IVS would prevent the motor from starting.

Billy T.
[email protected]

pdumont01 · Aug 16, 2015

U ever changed the ICP sensor?

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ghohouston · Aug 16, 2015

My bad, I guess I missed a number and thought it only showed 17 rpm's. Sounds like you need a new icp sensor.

np205 · Aug 16, 2015

Powerstroke Man 6.4 · Aug 16, 2015

Is there oil in the ICP connector? When my ICP sensor went bad, the truck started to lope and when given any throttle it would barely move a bit and that was it unplugged it parked it in supermarket parking lot, ended up not starting at all after.

I went to ford I got a new icp and cps just in case.

old man dave · Aug 20, 2015

gnxtc2 said:
I know if the IVS is bad, the truck will just idle; you'll have no throttle response. Don't know if a bad IVS would prevent the motor from starting.

Billy T.
[email protected]

Truck will start with IVS out of adjustment, just will not have any throttle.

Like some of the others, I vote for a bad CPS.