another crank no statrt
Fleet Mechanic
Joined: Jul 2013
Posts: 1,402
Likes: 114
From: Tuscaloosa, AL
Thanks Brian 
, yup you can check the IPR on the workbench by reading across pins A&B, for sure the way to go if you have the IPR out of the truck. The idea here is it's quicker/easier to check at the PCM connector than getting behind the turbo and getting the meter leads on the IPR connector pins.
The yellow/red stripe wire is the ground side, the other side is hot all the time (battery voltage) so the other lead goes to the + on the battery with the key on to close the circuit.
, yup you can check the IPR on the workbench by reading across pins A&B, for sure the way to go if you have the IPR out of the truck. The idea here is it's quicker/easier to check at the PCM connector than getting behind the turbo and getting the meter leads on the IPR connector pins.The yellow/red stripe wire is the ground side, the other side is hot all the time (battery voltage) so the other lead goes to the + on the battery with the key on to close the circuit.
But, let me say me and electricity don't get along. I usually blow a fuse or two when I get into electrical systems.
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Senior User
Joined: Dec 2012
Posts: 151
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From: Richlands NC
Got around to doing the compression check via the cranking and there is stark difference between the linked video and mine. I think my batteries needed a little more of a charge so i will try this again and then confirm which cylinder(s) is bad. I really don't like how it sounds.
Base engine problem maybe?????
https://www.flickr.com/photos/31331176@N06/15085752279/
Base engine problem maybe?????
https://www.flickr.com/photos/31331176@N06/15085752279/
Fleet Mechanic
Joined: Jul 2013
Posts: 1,402
Likes: 114
From: Tuscaloosa, AL
Got around to doing the compression check via the cranking and there is stark difference between the linked video and mine. I think my batteries needed a little more of a charge so i will try this again and then confirm which cylinder(s) is bad. I really don't like how it sounds.
Base engine problem maybe?????
https://www.flickr.com/photos/31331176@N06/15085752279/
Base engine problem maybe?????
https://www.flickr.com/photos/31331176@N06/15085752279/
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Senior User
Joined: Dec 2012
Posts: 151
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From: Richlands NC
Is the video clear enough for you to give an opinion on the crank? It was slower but had a whop whop whop sound to it. Not sure if that is a dead cylinder or not. It did not speed up or slow down however.
Fleet Mechanic
Joined: Jul 2013
Posts: 1,402
Likes: 114
From: Tuscaloosa, AL
I thought the batteries sounded very strong. There was a slight "speed up" that sounded like one cylinder might be weaker, but it wasn't bad and you really had to pay attention to notice it. I've heard then much worse that were running, but those were on trucks with much weaker batteries. Weak batteries will make a weak cylinder sound worse because it won't spin the motor as fast, causing the "speed up" to really stand out. I don't think that's your problem, but you could drain the batteries a little and see if it gets worse.
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Senior User
Joined: Dec 2012
Posts: 151
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From: Richlands NC
I assume you're talking about the video on flicker.
I thought the batteries sounded very strong. There was a slight "speed up" that sounded like one cylinder might be weaker, but it wasn't bad and you really had to pay attention to notice it. I've heard then much worse that were running, but those were on trucks with much weaker batteries. Weak batteries will make a weak cylinder sound worse because it won't spin the motor as fast, causing the "speed up" to really stand out. I don't think that's your problem, but you could drain the batteries a little and see if it gets worse.
I thought the batteries sounded very strong. There was a slight "speed up" that sounded like one cylinder might be weaker, but it wasn't bad and you really had to pay attention to notice it. I've heard then much worse that were running, but those were on trucks with much weaker batteries. Weak batteries will make a weak cylinder sound worse because it won't spin the motor as fast, causing the "speed up" to really stand out. I don't think that's your problem, but you could drain the batteries a little and see if it gets worse.
Fleet Mechanic
Joined: Jul 2013
Posts: 1,402
Likes: 114
From: Tuscaloosa, AL
I know Torque Pro can monitor FPW.
Now, in making that statement, I've reached the limit of my knowledge. I should document what my FPW is so I'll have it if needed.
Lead Driver
Joined: Feb 2011
Posts: 8,241
Likes: 155
From: L.A. (Lower Alabama)
I agree F350, it has a little bit of speed up, slow down to it. Sounds like there might be a little something going on there. Getting some numbered would confirm or rule it out much better. Good thing is it's not crazy sounding. I forget, did you do a bubble test? It's just cranking with the jumper (so the fuel pump doesn't run) and watching in the upper fuel filter bowl (filter and cap removed) for bubbles. If an injector is leaking, the air from compression will be forced through the leaking injector and through the lines back into the filter bowl.
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Senior User
Joined: Dec 2012
Posts: 151
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From: Richlands NC
I agree F350, it has a little bit of speed up, slow down to it. Sounds like there might be a little something going on there. Getting some numbered would confirm or rule it out much better. Good thing is it's not crazy sounding. I forget, did you do a bubble test? It's just cranking with the jumper (so the fuel pump doesn't run) and watching in the upper fuel filter bowl (filter and cap removed) for bubbles. If an injector is leaking, the air from compression will be forced through the leaking injector and through the lines back into the filter bowl.
I'm not sure if I can monitor fuel pulse width with ForScan pretty sure I can with scan gauge though.
Doesn't it need to be running to monitor that though?
Say I do have a problem with FPW hoes does one fix that?
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Senior User
Joined: Dec 2012
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From: Richlands NC
Question:
A substantial loss of compression in one or more cylinder would have signs of blowby via the oil fill tube?
When one or more cylinders lose compression does the fuel dilute the oil?
A substantial loss of compression in one or more cylinder would have signs of blowby via the oil fill tube?
When one or more cylinders lose compression does the fuel dilute the oil?
Fleet Mechanic
Joined: Jul 2013
Posts: 1,402
Likes: 114
From: Tuscaloosa, AL
If most of the cylinders have lost compression, the motor will spin very fast while cranking. You need some compression numbers. I don't know what they are supposed to be.
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