AE class is in session!
Posting Guru
Joined: Aug 2010
Posts: 1,002
Likes: 1
Now back to your regularly scheduled lecture... Which I am enjoying actually.
Hotshot
Joined: Dec 2006
Posts: 14,069
Likes: 17
From: Melbourne, Ky
I'm a sleeper on this thread mainly because I don't have an AE, and quite frankly, I'm not very knowledgeable with anything computer related. But, I do have a question, If the IDM doesn't have the voltage to fire the injectors, will you still get a pulse width reading?
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Hotshot
Joined: Jan 2011
Posts: 18,849
Likes: 179
From: Puget Sound
Single-weight oil [LINK]: "viscosity varies inversely with temperature"
Excerpt from Blackstone [LINK]:The difference between multi-grade and straight-weight oil is simply the addition of a viscosity improving (VI) additive. The most common grade of automotive oil in use today is the 5W/30, which is a mineral oil refined with VI additives that leave it reading as an SAE 5W viscosity when cold, yet an SAE 30W when hot (210F).
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Hotshot
Joined: Jan 2011
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Likes: 179
From: Puget Sound
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Hotshot
Joined: Jan 2011
Posts: 18,849
Likes: 179
From: Puget Sound
Naw... low voltage wouldn't allow the pulse width to climb. Basically, the last one says it should run, but it's not running. Now we need to visit all the other engine requirements to troubleshoot this one.
*EDIT* It was later discovered the cause of the no-start was the oil. His oil had gone an extended time without change (15-40) and doing a fresh change got the truck started, but with great effort and the truck needed to be plugged in. The Driver then switched to 5-40 Synthetic and he expressed amazement at how fast the engine cranks and how easy it was to start. The conlusion is his injectors are on the way out, and the synthetic oil is just loaning him some time until he can save up for new sticks.
- Good fuel?
- Fuel pressure?
- Good air?
- Timing (CPS)? We see the CPS working because we have an RPM signal. There's a DP in there, so I recommended yanking that long enough to get the truck running again.
- Compression? It just had glowplugs replaced... unsure if they were tighteed down properly.
- Glow Plug system? GPR recently replaced, GP LED works, all GPS ohmed out.
- UVCH? All injectors ohmed out. Open circuits trigger a code and there is no code on the truck.
*EDIT* It was later discovered the cause of the no-start was the oil. His oil had gone an extended time without change (15-40) and doing a fresh change got the truck started, but with great effort and the truck needed to be plugged in. The Driver then switched to 5-40 Synthetic and he expressed amazement at how fast the engine cranks and how easy it was to start. The conlusion is his injectors are on the way out, and the synthetic oil is just loaning him some time until he can save up for new sticks.
Hotshot
Joined: Dec 2006
Posts: 14,069
Likes: 17
From: Melbourne, Ky
Naw... low voltage wouldn't allow the pulse width to climb. Basically, the last one says it should run, but it's not running. Now we need to visit all the other engine requirements to troubleshoot this one.
- Good fuel?
- Fuel pressure?
- Good air?
- Timing (CPS)? We see the CPS working because we have an RPM signal. There's a DP in there, so I recommended yanking that long enough to get the truck running again.
- Compression? It just had glowplugs replaced... unsure if they were tighteed down properly.
- Glow Plug system? GPR recently replaced, GP LED works, all GPS ohmed out.
- UVCH? All injectors ohmed out. Open circuits trigger a code and there is no code on the truck.
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Hotshot
Joined: Jan 2011
Posts: 18,849
Likes: 179
From: Puget Sound
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Hotshot
Joined: Jan 2011
Posts: 18,849
Likes: 179
From: Puget Sound
If they're loose. I was amazed at how much compression I lost with just a loose injector that was still in place.
Laughing Gas
Joined: Apr 2007
Posts: 1,238
Likes: 2
From: North Port, Florida
Alright to cold to work today so I finally did my homework. Now I just need to figure out how to get it transfered for a look. My graph looked a little diffrent.
Hopefully this works
https://www.ford-trucks.com/forums/i...attach/doc.gif
Well that didnt work. Can someone help me out.
Hopefully this works
https://www.ford-trucks.com/forums/i...attach/doc.gif
Well that didnt work. Can someone help me out.
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Hotshot
Joined: Jan 2011
Posts: 18,849
Likes: 179
From: Puget Sound
No prob. Copy the file to your desktop to play with. It has a filenam like Ford-PowerStroke 7.3L-1999-March 24 2013.csv or with a ".xml" in place of the ".csv". The three letters to the right of the dot are jamming you from attaching it - that's called a filename extention. If you right-click on the file and select "Rename", you can cange that ".csv" or ".xml" to a ".doc". Once that is done, you can attach the file in a post with no problem. PM me if you find yourself saying "What dot? Where are the last three letters?"
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Hotshot
Joined: Jan 2011
Posts: 18,849
Likes: 179
From: Puget Sound
OK... you can download this, but you need to rename the last three letters of the file name from TXT to CSV. I boogered the data up (on purpose). I set the bottom limit of the pressure at the altitude pressure. I'll explain:
caverjoe is a few hundred feet above sea level and his absolute air pressure is about 14 PSI (remember... the International Space Station is at zero PSI absolute pressure). So... I set the minimum pressure at 14 PSI. Any rise on the graph will then become "Indicated Pressure", like having a boost gauge and a backpressure gauge.
caverjoe is a few hundred feet above sea level and his absolute air pressure is about 14 PSI (remember... the International Space Station is at zero PSI absolute pressure). So... I set the minimum pressure at 14 PSI. Any rise on the graph will then become "Indicated Pressure", like having a boost gauge and a backpressure gauge.
Laughing Gas
Joined: Apr 2007
Posts: 1,238
Likes: 2
From: North Port, Florida
OK... you can download this, but you need to rename the last three letters of the file name from TXT to CSV. I boogered the data up (on purpose). I set the bottom limit of the pressure at the altitude pressure. I'll explain:
caverjoe is a few hundred feet above sea level and his absolute air pressure is about 14 PSI (remember... the International Space Station is at zero PSI absolute pressure). So... I set the minimum pressure at 14 PSI. Any rise on the graph will then become "Indicated Pressure", like having a boost gauge and a backpressure gauge.
caverjoe is a few hundred feet above sea level and his absolute air pressure is about 14 PSI (remember... the International Space Station is at zero PSI absolute pressure). So... I set the minimum pressure at 14 PSI. Any rise on the graph will then become "Indicated Pressure", like having a boost gauge and a backpressure gauge.