7.3 engine timing - 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 04-18-2005, 04:59 PM   #1 (permalink)
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7.3 engine timing

I was reading a post on another board and they were talking about engine timing and by changing it from 9 degrees BTDC to 6 degrees BTDC he increased his milage. If this is possiable how do you check the timing ? What tools are needed ?
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Old 04-18-2005, 05:03 PM   #2 (permalink)
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Re: 7.3 engine timing

[ QUOTE ]
I was reading a post on another board and they were talking about engine timing and by changing it from 9 degrees BTDC to 6 degrees BTDC he increased his milage. If this is possiable how do you check the timing ? What tools are needed ?

[/ QUOTE ]

All timing on these engines 94 and up are controled by software in the PCM based on various sensor readings is the main key input IMO is from the CPS. You can electronically fool some sensors such as the ICP and EOT to effect timing as you refer to it, but it's not like you're thinking of the timing on gassers.


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Old 04-18-2005, 05:45 PM   #3 (permalink)
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Re: 7.3 engine timing

As larry stated, cannot change timing on a DI. Maybe they were talking about changing timing on an old IDI?
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Old 04-18-2005, 06:35 PM   #4 (permalink)
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Re: 7.3 engine timing

You can to change timing on a DI diesel.

If you put a resistor across the engine oil temp sensor and make the computer think the engine is cold, it advanes the timing.

Cant really mess with the CPS signal without making a chip/tuner, but changes to timing are done to counter the effects of propane (which effectively advances the timing, leading to precombustion and blown rods).

The timing changes are really changing when the injectors fire. Too soon and you can send the rods thru the engine block. Too late and you lose power.
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Old 04-18-2005, 07:52 PM   #5 (permalink)
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Re: 7.3 engine timing

[ QUOTE ]
The timing changes are really changing when the injectors fire. Too soon and you can send the rods thru the engine block. Too late and you lose power.

[/ QUOTE ] That is exactly the way I have always understood it. The fireing of the injector is just like the fireing of the spark plug...has to happen at a certain degree before TDC. Just like a gasser. And you can mess with it..but has to be a chip or programmer as stated above.
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Old 04-18-2005, 08:11 PM   #6 (permalink)
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Re: 7.3 engine timing

[ QUOTE ]
You can to change timing on a DI diesel.

If you put a resistor across the engine oil temp sensor and make the computer think the engine is cold, it advanes the timing.


[/ QUOTE ]
Understandable....but this is not the upgrade and aftermarket forum. You cannot change timing (using factory settings, ect) on a DI.
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Old 04-18-2005, 09:18 PM   #7 (permalink)
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Re: 7.3 engine timing

[ QUOTE ]
[ QUOTE ]
You can to change timing on a DI diesel.

If you put a resistor across the engine oil temp sensor and make the computer think the engine is cold, it advanes the timing.


[/ QUOTE ]
Understandable....but this is not the upgrade and aftermarket forum. You cannot change timing (using factory settings, ect) on a DI.

[/ QUOTE ]

Oh come on, are you trying out for a moderator position on this site? Thats some screwed up post. The guy asked a simple question and we give him screwed up answers. Adjusting the timing is a perfectly acceptable quesion in the ENGINE forum. Once he was told that it requires an upgrade or aftermarket item, it could then get moved. But to tell him NO IT CANT BE DONE because he posted in the wrong forum is just boneheaded.
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Old 04-18-2005, 09:40 PM   #8 (permalink)
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Re: 7.3 engine timing

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But to tell him NO IT CANT BE DONE because he posted in the wrong forum is just boneheaded.

[/ QUOTE ]
Not boneheaded...just the facts. It cant be done without an aftermarket piece of hardware. This isn't the aftermarket forum. So I was stating that if he is looking in the service manual, he won't find the procedure because it isn't in there. No need to get huffy big shooter... [img]/ubbthreads/images/graemlins/smirk.gif[/img]
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Old 04-19-2005, 04:20 AM   #9 (permalink)
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Re: 7.3 engine timing

Well,, DJ that is the way I thought you came across to.. trying to be like a moderator..though nothing wrong with that if you are one. [img]/ubbthreads/images/graemlins/shrug.gif[/img] But even if you didnt intend your post to read that way,,it's the way it came across,,,, OK?
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Old 05-13-2005, 06:16 AM   #10 (permalink)
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Re: 7.3 engine timing

HOW COME EVERY TIME I GET ON A FORUM BE IT POWERSTROKES TO PAINTBALLS YOU ALWAYS HAVE PEOPLE ARGUEING OVER WHERE STUFF GOES? WHO THE HECK CARES!! WE ARE SUPPOSED TO BE HELPING EACH OTHER OUT WITH INFO AND IF IT SNEAKS IN THE WRONG TITLE I PROMISE YOUR ENGINE WONT EXPLODE. RELAX....
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Old 05-13-2005, 09:01 AM   #11 (permalink)
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Re: 7.3 engine timing

The question you ask is fraught with pitfalls.

On ANY of the HEUI engines, there are two very different values for "timing". The first is the electronic signal that TRIES to start the injection event. The computer tells the injector to fire, and then after some period of time, the fuel gets delivered to the chamber and then it actually DOES begin to burn. There is no hardware to communicate that event in real time (i.e. closed loop) to the PCM to let it know that it actually happened, so there can be some HUGE variation, and thus the one, big soft spot in HEUI technology. Add to that the split shot injectors from '99 on, that have even more mechanical assumptions to control injection.

Because of these things (we can only assume) the PSD is shipped with relatively late timing (to prevent some of the cackle and knock problems from getting out of hand). They usually benefit from increasing the lead of the injection signal.

You can change timing in a number of ways (all software related - even the EOT mod is just fooling the computer), but you could only know where it actually "fires" by measuring cylinder pressure vs. crank angle.

Hope that helps.

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Old 05-13-2005, 09:33 PM   #12 (permalink)
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Re: 7.3 engine timing

[ QUOTE ]


If you put a resistor across the engine oil temp sensor and make the computer think the engine is cold, it advanes the timing.



[/ QUOTE ]

What size resistor ?? Can you use a potentiometer to vary the resistance and change the timing similar to the Distributor cap on an old gasser? If so, How can you tell when the timing might be getting too far advanced and potentially doing the "rod through the oil pan" trick as previously stated.... When you hear the load bang, and the metal strapnal hits your feet and ankles??
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Old 05-13-2005, 10:33 PM   #13 (permalink)
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Re: 7.3 engine timing

[ QUOTE ]
You can to change timing on a DI diesel.

If you put a resistor across the engine oil temp sensor and make the computer think the engine is cold, it advanes the timing.

Cant really mess with the CPS signal without making a chip/tuner, but changes to timing are done to counter the effects of propane (which effectively advances the timing, leading to precombustion and blown rods).

The timing changes are really changing when the injectors fire. Too soon and you can send the rods thru the engine block. Too late and you lose power.

[/ QUOTE ]

Does not change timing just richens up the fuel.

As a certified Ford Diesel Senior Master,I can tell you with all certainty....you cannot change the timing
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Old 05-13-2005, 11:03 PM   #14 (permalink)
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Re: 7.3 engine timing

[ QUOTE ]
Does not change timing just richens up the fuel.

As a certified Ford Diesel Senior Master,I can tell you with all certainty....you cannot change the timing

[/ QUOTE ]

Well, I dont know how to put this politely, so I'll just post it as I found it:
[ QUOTE ]

EOT Engine Oil Temperature Sensor:
Strategy input; PCM uses this for determining glow plug on time, EPR actuation, idle speed, fuel delivery and injection timing and adjusts as temperature increases; 5.0 volts in, 4.37 volts@32F, 1.37 volts @ 176F, .96 volts @ 205F.

[/ QUOTE ]

As you can see, even the FORD manual says CHANGES INJECTION TIMING.

Injection timing is the only timing we can change without pulling the motor apart.

The OTHER timing we could mess with (but dont) would be camshaft timing to adjust valves opening and closing. Like "degreeing" a cam on a gas burner.

I havnt seen a very large market for custom PSD cams, so cam/valve timing must be fairly good from the factory.

Also take a look at THIS OLD THREAD . Its from someone who played around with the EOT and his results.

Careful waiving those Certifications around, doesnt look like they are worth much.
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Old 05-21-2005, 10:36 PM   #15 (permalink)
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Re: 7.3 engine timing

I am posting this a little late but you can change the timing on these engines by installing a DT cam sensor. They have a smaller tip and will see the timing disk 2 degrees later than the Powerstroke sensor. At work when we get a bad running DT in cold weather we often install a Powerstroke Cam sensor to advance the timing and it will run better in the cold weather.
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