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CDA 455 II
ANFAQUE2
nOOB academic questions:
1) What would happen if I pulled the brake booster vacuum tube and plug the connection at the vacuum tree?
2) How would the brake work/feel with no vacuum assist?
CDA 455 II
ANFAQUE2
Dead head? Making the pump build maximum pressure and no or low flow. The result would be trying to turn off the engine by overloading it at idle.What's that?🤔
Be me and replace a ps pump for a customer,
watch customer rotate steering wheel fully and hold it hard against the steering stop hearing the relief valve screaming as they maneuver through the parking lot.
look forward to replacing it again soon.
FAFO
watch customer rotate steering wheel fully and hold it hard against the steering stop hearing the relief valve screaming as they maneuver through the parking lot.
look forward to replacing it again soon.
FAFO
Will Scarlet
The universe is vast...
- Joined
- May 20, 2020
- Member Number
- 766
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- 1,666
After seeing the vacuum line going to your throttlebody, I would suggest checking all of your vacuum lines to be sure they're not leaking. You'll likely find that there is more of them to be to be replaced.I've discovered a phenomenon after installing the Saginaw PS pump:
When I do tight/near-locked continuous turns or many turns (like backing in a trailer), I completely lose brake pressure for several seconds.
After several seconds I regain full brake pressure.
When I'm driving around doing normal turns; everything is good.
It's when I do tight turns or a series of tight turns that I lose brake pressure.
nOOB question:
What the flyin' fug?!!
You don't want to do this as you'll lose most of your braking power.
arse_sidewards
Red Skull Member
- Joined
- May 19, 2020
- Member Number
- 71
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- 8,562
Unplugging and capping the brake booster is a fine diagnostic tool. If nothing changes you know your problem is vacuum
CDA 455 II
ANFAQUE2
nOOB academic question:
If I drilled a .25" hole in the rubber intake tube; could/would it affect vacuum pressure?
If I drilled a .25" hole in the rubber intake tube; could/would it affect vacuum pressure?
arse_sidewards
Red Skull Member
- Joined
- May 19, 2020
- Member Number
- 71
- Messages
- 8,562
No. All it would do is make it run slightly shitty because the air is not passing the MAF and not being metered.nOOB academic question:
If I drilled a .25" hole in the rubber intake tube; could/would it affect vacuum pressure?
CDA 455 II
ANFAQUE2
Ok.
The reason for the query is;
Where the two rubber tubes connect to the throttle body, is mangled/torn/worn and shows signs of leakage.
That statement makes me want to make sure you understand vacuum is only created on the engine side of the throttle blade. Anything in front of it will have no vacuum.
CDA 455 II
ANFAQUE2
Ah; good point.
USMC Gunny
Well-known member
- Joined
- May 22, 2020
- Member Number
- 1116
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- 320
For like 130 bucks just gonna replace it.
CDA 455 II
ANFAQUE2
I haven't had my '99.5 7.3 PS since 2010; so I'm out of date on its' tech.
Please expand/explain your two points.
CDA 455 II
ANFAQUE2
What's wrong with the current one?
Levigarrett76
Zeus of the Sluice
Deleting the leaky EBPV actuator rod and butterfly. You can convert your factory pieces for little cost vs spending $200 on non ebpv parts from china (van application). It doesn't take very long if you have the tap and pipe plug ready to go. Im typically a time is money type guy, but the 4 trucks I've done over the years I just have chosen this route to put more $ towards other goodies.I haven't had my '99.5 7.3 PS since 2010; so I'm out of date on its' tech.
Please expand/explain your two points.
These pictures are 94-97 turbo but same thing applies to 99-03.
CDA 455 II
ANFAQUE2
Deleting the leaky EBPV actuator rod and butterfly. You can convert your factory pieces for little cost vs spending $200 on non ebpv parts from china (van application). It doesn't take very long if you have the tap and pipe plug ready to go. Im typically a time is money type guy, but the 4 trucks I've done over the years I just have chosen this route to put more $ towards other goodies.
These pictures are 94-97 turbo but same thing applies to 99-03.
So you simply remove the butterfly and plug the holes?
Levigarrett76
Zeus of the Sluice
How do you like it?
Do you happen to know if it turns off the bs computer controlled oil pressure reduction at hot idle and subsequent vct issues?
Also actuator rod in pedestal assembly. Look at rod coming out of pedestal in first photo. Remove the snap ring and plate and pull out from the back once you remove/cut off the piece that attaches to the butterfly. Only the bottom hole needs plugged. There is a core plug that fits this but this time everywhere was out of stock so I just cut piece of shaft and welded.
CDA 455 II
ANFAQUE2
Levigarrett76
Zeus of the Sluice
Parameters of Exhaust Back Pressure - Ford Truck Enthusiasts Forums
1999 - 2003 7.3L Power Stroke Diesel - Parameters of Exhaust Back Pressure - I have a 1999.5 7.3 power-stroke. Can anyone tell me what conditions must be met in order for the Power Control Module to activate the Exhaust Back Pressure Valve. When the truck is first started in cold weather, it...
www.ford-trucks.com
Some people do offer tunes to use as an exhaust brake.
DMG
Red Skull Member
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- May 20, 2020
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I have heard is keeps the oil pressure up but am not sure. I can message Osborne and ask.
The truck runs and shifts better. I reset all the adaptive/KAM so it is has relearned everything.
I have only hammered on it once in sport mode since the tune. I was a bit gentle off the line then put It to the rug. It shifted at 7k rpm and chirped the tires in 2nd and 3rd. At that point my passengers asked that I settle down. It feels fast. that was on a tank that has some e85 and some 87 octane.
CDA 455 II
ANFAQUE2
I'm going to guess my '99.5 had one.
But during Winter months the PS would never warm up while idling.
And if I drove the F-350 and then parked it while idling, the PS temp would drop.
USMC Gunny
Well-known member
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- May 22, 2020
- Member Number
- 1116
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I have the turbo out since it decided to piss oil out of the orings. I have already dropped coin on a new front bumper, banks intercooler and Marty's efuel just this year. whats another 130ish more. LOL
Levigarrett76
Zeus of the Sluice
Got pics of the efuel setup?
I liked Mark's kit except for the thin aluminum plate.
DMG
Red Skull Member
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- May 20, 2020
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- 495
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Levigarrett76
The response from Oz
”Oil pressure can’t be raised via tuning. Oil pressure is a product of the oil pump and engine RPM. What can be done via tuning is adjusting how the oil pressure control solenoid works, and not allowing it to bleed off as much pressure like it does on the stock tune, which is something we do in our tunes”
So it looks like it keeps higher oil pressure at idle. I read that it does that somewhere else as well.
The response from Oz
”Oil pressure can’t be raised via tuning. Oil pressure is a product of the oil pump and engine RPM. What can be done via tuning is adjusting how the oil pressure control solenoid works, and not allowing it to bleed off as much pressure like it does on the stock tune, which is something we do in our tunes”
So it looks like it keeps higher oil pressure at idle. I read that it does that somewhere else as well.
Levigarrett76
Zeus of the Sluice
DMG
Red Skull Member
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I knew what you meant. Ken Osbourne probably deals with retards regularly enough that he needs to ne extra clear.
CDA 455 II
ANFAQUE2
Replaced the brake booster vacuum tube.
