Dying 7.3...
Thread Starter
|
Elder User
Joined: Nov 2013
Posts: 627
Likes: 0
From: Manteca
Our 7.3 that we bought without hearing it run was a gamble lol... after replacing the pump and injectors with new, she took for ever to start. Once started it ran ok had good power, ats turbo and r&d pump with sticks.. when starting it hot you have to floor it to get it to fire up, it weak on compression and was seeing if there is a "ring sealer in a can" that's worth a shot?? Rebuild and replacement are out of the question till the first of the year
Postmaster
Joined: Dec 2011
Posts: 3,860
Likes: 7
Are you saying it starts right up cold, but not hot? Like, just crank-crank-crank no smoke or fire?
Or hard to start both times?
Also, what sort of compression were you seeing? Unless it's down below 300PSI, it should fire right up if everything else is right.
Perhaps you could post a video if you trying to start it?
Or hard to start both times?
Also, what sort of compression were you seeing? Unless it's down below 300PSI, it should fire right up if everything else is right.
Perhaps you could post a video if you trying to start it?
Thread Starter
|
Elder User
Joined: Nov 2013
Posts: 627
Likes: 0
From: Manteca
Are you saying it starts right up cold, but not hot? Like, just crank-crank-crank no smoke or fire?
Or hard to start both times?
Also, what sort of compression were you seeing? Unless it's down below 300PSI, it should fire right up if everything else is right.
Perhaps you could post a video if you trying to start it?
Or hard to start both times?
Also, what sort of compression were you seeing? Unless it's down below 300PSI, it should fire right up if everything else is right.
Perhaps you could post a video if you trying to start it?
Postmaster
Joined: Dec 2011
Posts: 3,860
Likes: 7
I'm wondering about the IP or transfer pump; make sure you're getting good pressure at the filter head whole cranking.
Alternately, if it's not cranking fast enough, that could cause it -- IPs, especially old ones with new injectors have trouble producing enough pressure to actually inject fuel. And the component that would be at fault here, the main distributor/rotor, doesn't usually get replaced during a rebuild due to cost($400 alone).
Do have someone crank while hot and smell the exhaust for fuel -- with it floored, it should definitely smell like unburned diesel.
What does it do if you let the GPs cool down while cold(leave the key on for a minute after it stops clicking) and give it a very light shot of ether?
Alternately, if it's not cranking fast enough, that could cause it -- IPs, especially old ones with new injectors have trouble producing enough pressure to actually inject fuel. And the component that would be at fault here, the main distributor/rotor, doesn't usually get replaced during a rebuild due to cost($400 alone).
Do have someone crank while hot and smell the exhaust for fuel -- with it floored, it should definitely smell like unburned diesel.
What does it do if you let the GPs cool down while cold(leave the key on for a minute after it stops clicking) and give it a very light shot of ether?
Thread Starter
|
Elder User
Joined: Nov 2013
Posts: 627
Likes: 0
From: Manteca
I'm wondering about the IP or transfer pump; make sure you're getting good pressure at the filter head whole cranking.
Alternately, if it's not cranking fast enough, that could cause it -- IPs, especially old ones with new injectors have trouble producing enough pressure to actually inject fuel. And the component that would be at fault here, the main distributor/rotor, doesn't usually get replaced during a rebuild due to cost($400 alone).
Do have someone crank while hot and smell the exhaust for fuel -- with it floored, it should definitely smell like unburned diesel.
What does it do if you let the GPs cool down while cold(leave the key on for a minute after it stops clicking) and give it a very light shot of ether?
Alternately, if it's not cranking fast enough, that could cause it -- IPs, especially old ones with new injectors have trouble producing enough pressure to actually inject fuel. And the component that would be at fault here, the main distributor/rotor, doesn't usually get replaced during a rebuild due to cost($400 alone).
Do have someone crank while hot and smell the exhaust for fuel -- with it floored, it should definitely smell like unburned diesel.
What does it do if you let the GPs cool down while cold(leave the key on for a minute after it stops clicking) and give it a very light shot of ether?
i ain't rite
Joined: Mar 2005
Posts: 65,515
Likes: 5,567
From: Marlboro Mental Hospital.
Trending Topics
Thread Starter
|
Elder User
Joined: Nov 2013
Posts: 627
Likes: 0
From: Manteca
Thank you, I don't even think I'm getting that much, 10 seconds of cranking got me I believe a quarter of a quart
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
Posting Guru
Joined: Feb 2013
Posts: 1,203
Likes: 0
The two ways I know to breath some life into a dying engine, put a couple quarts of atf in the oil and run it hard. then the last resort is get it hot, they'll start to pop and smoke, after that let it idle and cool back down.
Thread Starter
|
Elder User
Joined: Nov 2013
Posts: 627
Likes: 0
From: Manteca
After the glow plugs cool off I give it 3, 1 second sprays of starting fluid. It almost wants to start, rpm picks up for a few cranks and that's it. When it does start you need at least half pedal or more for it to start.. it won't start at idle position even hot,
Postmaster
Joined: Dec 2004
Posts: 2,941
Likes: 30
From: Maple Valley, WA
Below 300 on the compression will do it, just not enough air to compress. The heat from the compression is so low that not even ether is igniting.
I know that pump had a great Hot cranking spec, so I know its not the pump.
How is the blowby when its running?
I know that pump had a great Hot cranking spec, so I know its not the pump.
How is the blowby when its running?
Thread Starter
|
Elder User
Joined: Nov 2013
Posts: 627
Likes: 0
From: Manteca
Yeah the numbers on that pump are awesome man! When she does run it runs like a raped ape!! Very impressed with the power.. Blow by is a steady stream of white vapor lol looks like something is on fire under the hood when the CDR valve is not hooked up just like my 6.9, but as soon as you bringing the RPM's up you can barely see any blow by, but my 6.9 has a little under 400 pounds of compression, so a little better.. That turbo does a good job of cleaning up unburned fuel though, I have very little hazes at full throttle
