[Hydro]

What does the IPR percentage and ICP sensor voltage (not pressure) do when the engine starts to die ?

 

[erickson529]

What does the IPR percentage and ICP sensor voltage (not pressure) do when the engine starts to die ?

IPR 23.83%
0.92v

I have brand new IPR screens and orings and a brand new ICP sensor. Those values are at 500 rpm right before RPM hits 0.

If i put about 15% fuel pedal application truck will stay running all day long, as soon as i let off truck dies in seconds.

 

[Hydro]

OK, good -- you dont have an oil pressure problem there , or the IPR value would go up at the end

You aren't getting codes for the pedal sensor ?

Does the engine just slow down to a stop? -- or just quit firing altogether ? like the key was turned off

Have you watched the load pid to see if it spikes ? -- not real sure how load is calculated

 

[erickson529]

No codes for pedal sensor. The engine shuts off as if i turned the key off. Its as if once the truck is at operating temp and its not giving it enough fuel to stay running but when its cold starts and runs fine for about 5 min. No nasty smoke only a white puff when it is initially started. I just put a brand new fuel pump in and sinister blue spring kit.

 

[bismic]

Is the fuel tank still at 25% (this is where it was in your first post)?

 

[erickson529]

Is the fuel tank still at 25% (this is where it was in your first post)?

No i put fresh fuel in 3/4 of a tank now. I was running it at 1000RPM and it was running fine as soon as i click it off high idle with AE it died. So f***ing weird.

 

[Hydro]

Since the engine just cuts off -- we are prolly looking at an electrical problem
if it were fuel, there would be some sputtering just before it died

 

[erickson529]

Whats weird is that when engine is cold it will run fine just hard to start. Which wiring do u figure it would be? I have a brand new injector wire harness.

 

[Hydro]

Which wiring do u figure it would be?

That's the $64 question, isn't it

 

[Hydro]

Without a code popping -- the system "thinks" it is operating normally
so have to look at things that do not produce a code
but yet, just cuts the engine off

no sputtering at all ?
RPM act goofy before it dies ?

 

[erickson529]

Not at all. I had stuck my hand down to the cam sensor and it felt a bit of oil and gunk on the plug in but it is in sync with crank shaft sensor. And ficm is synced as well.

 

[twoicebergs]

What is the alternator and battery voltage at the low idle after 5 minutes? The part that is puzzling is the 5 minutes and it keeps running at a higher idle.If the voltage were to drop to 9v, it would quit running. If the HPO sensor dropped below .8v, it would quit. If the fuel pressure was very low, it would quit. If you lost Sync (Cam or crank) it would quit.

The key to the issue is to know what parameter is lost when it dies. Until that is known, we are just chasing ghosts.

 

[erickson529]

What is the alternator and battery voltage at the low idle after 5 minutes? The part that is puzzling is the 5 minutes and it keeps running at a higher idle.If the voltage were to drop to 9v, it would quit running. If the HPO sensor dropped below .8v, it would quit. If the fuel pressure was very low, it would quit. If you lost Sync (Cam or crank) it would quit.

The key to the issue is to know what parameter is lost when it dies. Until that is known, we are just chasing ghosts.

 

[bismic]

Looks like the first signs of problems are the rpm dropping and then going to zero, and FICM Sync is lost at zero rpm. Cam/Crank Sync is lost immediately after that in the next set of readings.

 

[Hydro]

I agree, the RPM reading is dropping out first -- need to look into the sensor, wiring, connector, tone ring gap

Ditch that Excel and download Open Office -- otherwise good use of the data

 

[erickson529]

I agree, the RPM reading is dropping out first -- need to look into the sensor, wiring, connector, tone ring gap

Ditch that Excel and download Open Office -- otherwise good use of the data

Which sensor?

 

[Hydro]

Crankshaft sensor -- RPM signal originates there
also need to check the wiring back to the PCM
using a meter at the PCM connector you should get the same Ohms that you do at the sensor
wiggling the wires and connectors while watching the meter - connected at the PCM connector , looking for blips in the meter

 

[erickson529]

Crankshaft sensor

Is there a way to test sensor. Ohms?

 

[Hydro]

Edited the previous post to indicate testing

 

[erickson529]

Edited the previous post to indicate testing

Ty i will try that, is there a value for sensor to know if it is faulty or not?