[b.cook]

Hey Everyone,

Love this truck but here's what's happened. Started, ran, and drove normally for about 2 miles then at a stop sign died during take off and won't start again. Now when I crank it I don't see any smoke (not white or any) out of the exhaust.

I can get the truck to fire momentarily if I squirt starting fluid in the air intake (I know, I know, I just wanted to test).

Recent (within last 6 months) parts that I have replaced:

• HPOP (Motorcraft)
• ICP and pigtail connector (Motorcraft)
• IPR (Napa)
• CPS (International Black)

What I have done to troubleshoot so far:

• Checked RPM's when cranking and they move so I'm assuming CPS is good.
• Checked current draw on glow plug relay and drawing around 100amps when the relay is active.
• Removed Fuel filter and watched fuel bowl when key on, fuel fills quickly into bowl so I'm assuming I'm getting fuel.
• Checked connection to fuel bowl heater and it looks good.
• Tin nut on IPR is solid and IPR plug is secure.
• Connected forscan and did the following tests:

---- KOEO Injector electrical self test - NO ISSUES
---- KOEO Output state test - NO ISSUES
---- PCM KOEO on demand self test
------ Code P0605 PCM memory failure displayed.

I then watched the forscan values while cranking. There are two videos below. The first one shows the values with the ICP plugged in. The second video shows the values when I unplugged the ICP out of curiosity.

At this point I'm a bit stumped but I'm wondering if I have a IDM or PCM issue, or if my Napa IPR is stuck open or something? Any ideas would be greatly appreciated!

Best Regards,

Bob

ICP Connected

www.youtube.com

ICP Disconnected

www.youtube.com

 

[Jax]

What year is your truck? How many miles on the engine?

Recent (within last 6 months) parts that I have replaced:

• HPOP (Motorcraft)
• ICP and pigtail connector (Motorcraft)
• IPR (Napa)
• CPS (International Black)

Why?

---- KOEO Injector electrical self test - NO ISSUES
---- KOEO Output state test - NO ISSUES
---- PCM KOEO on demand self test
------ Code P0605 PCM memory failure displayed.

Per the guy that tested my PCMs: The P0605 code you mentioned is due to a checksum error which is normal when parameters have been changed. The PCM does not recognize this because it is different from how it was programmed to operate. You will see this either with a chip running programs other than stock or when a PCM has been programmed with a tune.

Welcome to PSN!

It isn't right that you have no codes in a no-start. I've not seen Injector Pressures like that, nor the IPR %.

Do you have a leak? There is no reason the Injector Pressure % should be that high.

 

[Jax]

First, the ICP voltage doesn't matter. The ICP varies resistance according to the pressure and the PCM translates that voltage to the "ICP, psi" number.

What would be handy on your dashboard is RPM.

I can't believe there are not a poopload of codes. What year is it?

Did you use a torque wrench on the IPR and its tin nut? Did you inspect the wiring for the IPR?

And when and why did you replace all those parts?

 

[b.cook]

First, the ICP voltage doesn't matter. The ICP varies resistance according to the pressure and the PCM translates that voltage to the "ICP, psi" number.

What would be handy on your dashboard is RPM.

I can't believe there are not a poopload of codes. What year is it?

Did you use a torque wrench on the IPR and its tin nut? Did you inspect the wiring for the IPR?

And when and why did you replace all those parts?

Thanks!

It is a ‘99.

I replaced the parts for various issues. For example my HPOP went out and while I was replacing it the IPR was pretty old so I thought it would be a good idea to replace it.

For the ICP and CPS they were replaced because of it dying on me. I JUST replaced the CPS as it died on my son and my initial troubleshooting led me to suspect the CPS. I replaced it with the International and it fired right up. But then when I took it for a test drive it died and hasn’t restarted since.

The IPR wiring looked good to me when I replaced it. As for torquing it, to be honest I’m not sure that I did.

 

[b.cook]

What year is your truck? How many miles on the engine?



Why?


Per the guy that tested my PCMs: The P0605 code you mentioned is due to a checksum error which is normal when parameters have been changed. The PCM does not recognize this because it is different from how it was programmed to operate. You will see this either with a chip running programs other than stock or when a PCM has been programmed with a tune.

Welcome to PSN!

It isn't right that you have no codes in a no-start. I've not seen Injector Pressures like that, nor the IPR %.

Do you have a leak? There is no reason the Injector Pressure % should be that high.
View attachment 207893 View attachment 207894

Not aware of any leaks. There aren’t any oil leaks at all on this truck. Had the HPOP spring a leak which is why it was replaced. While I had it out the IPR looked pretty old so I replaced it.

ICP and CPS were replaced as part of the troubleshooting for this issue.

 

[b.cook]

I will go clear any codes, and try to start it and post a vid of any codes that show up in forscan.

 

[b.cook]

Here is a vid that shows the lack of codes when cranking. In this video I have the CPS connected.

 

[Jax]

I will go clear any codes, and try to start it and post a vid of any codes that show up in forscan.

Video not necessary. just post the codes.

Did you torque the HPOP gear bolt to 95 ft-lbs?

 

[Jax]

Here is a vid that shows the lack of codes when cranking. In this video I have the CPS connected.

Darn, you're quick! Good Job!

Your RPMs should be higher than that - but the crank-over sounds good.
Your ICP showed zero - are you sure it was plugged in?? If it isn't plugged in, the PCM looks up the values in a table. That isn't right - the ICP is not

@cfherrman @1970something What is the minimum RPM for starting?

@b.cook, do you use this for a daily driver?

Here is the issue - the Powertrain Control Module (PCM) takes the input from the Injector Control Pressure Sensor (ICP) to adjust the Injector Pressure Regulator. For sure, the ICP isn't sending a signal. Your last video showed that.

Just SWAGging, you need to check your ICP wiring, since you replaced the pigtail. Perhaps the connection came loose, or something shorted. You should have an ICP psi value.

 

[Jax]

Do you know, is your truck an early 99 or a late 99?

Manufacture date 12/08/98 or later is a late 99.

I ask because I have 99.5 - 2003 wire diagrams.

 

[b.cook]

Darn, you're quick! Good Job!

Your RPMs should be higher than that - but the crank-over sounds good.
Your ICP showed zero - are you sure it was plugged in?? If it isn't plugged in, the PCM looks up the values in a table. That isn't right - the ICP is not

@cfherrman @1970something What is the minimum RPM for starting?

@b.cook, do you use this for a daily driver?

Here is the issue - the Powertrain Control Module (PCM) takes the input from the Injector Control Pressure Sensor (ICP) to adjust the Injector Pressure Regulator. For sure, the ICP isn't sending a signal. Your last video showed that.

Just SWAGging, you need to check your ICP wiring, since you replaced the pigtail. Perhaps the connection came loose, or something shorted. You should have an ICP psi value.

Thanks,

What does it mean that the ICP pressure is closer to normal (220+ PSI) when the ICP is unplugged? The new ICP has been in place for about a month or so without issues. When I installed a new pigtail I soldering and heat shrieked the connections. The plug on the ICP is clipped in very well and the connector is very clean (no oil)

This is not my daily driver, but I use it a fair amount.

 

[b.cook]

Video not necessary. just post the codes.

Did you torque the HPOP gear bolt to 95 ft-lbs?

I honestly don’t remember, but I’m usually pretty good about torquing things to the appropriate values.

 

[b.cook]

Do you know, is your truck an early 99 or a late 99?

Manufacture date 12/08/98 or later is a late 99.

I ask because I have 99.5 - 2003 wire diagrams.

It’s a late 99.

 

[Jax]

 

[Jax]

Thanks,

What does it mean that the ICP pressure is closer to normal (220+ PSI) when the ICP is unplugged? The new ICP has been in place for about a month or so without issues.

The ICP may have gone bad.

When the ICP is unplugged, the PCM is looking up a value from a table. When it is plugged in, the PCM "knows" because the BRN/WHT and the GRY/RED are live. The varying voltage is the DK BLU/LT GRN wire. Something is wrong.

Did you save your old ICP? (I do, so I have spares to use as "known good". The Motorcraft sensor should have a warranty.

Here's good ICP info. ICP SENSOR 7.3 Injection Control Pressure Sensor SECRETS | Dead Head Diesel

 

[Jax]

My biggest concern is that you have NO trouble codes, and you should.

I hate to say it, but that points firmly at the PCM.

This places tests them: 7.3 PCM + IDM Testing

Then they call or email to tell you what's up. It's about 5 days shipping, a day turnaround (if nothing is wrong), and five days back. Shipping is included in the fee.

 

[b.cook]

The ICP may have gone bad.

When the ICP is unplugged, the PCM is looking up a value from a table. When it is plugged in, the PCM "knows" because the BRN/WHT and the GRY/RED are live. The varying voltage is the DK BLU/LT GRN wire. Something is wrong.

Did you save your old ICP? (I do, so I have spares to use as "known good". The Motorcraft sensor should have a warranty.

Here's good ICP info. ICP SENSOR 7.3 Injection Control Pressure Sensor SECRETS | Dead Head Diesel

Unfortunately I don’t have the old one. What are the chances of a brand new Motorcraft going bad?

 

[b.cook]

My biggest concern is that you have NO trouble codes, and you should.

I hate to say it, but that points firmly at the PCM.

This places tests them: 7.3 PCM + IDM Testing

Then they call or email to tell you what's up. It's about 5 days shipping, a day turnaround (if nothing is wrong), and five days back. Shipping is included in the fee.

Would it be prudent to try a different ICP before a PCM?

 

[Gov Holmes]

And your fuel pressure is where it should be , fuse and all are wright on ? Gov Holmes

 

[cfherrman]

Idk you probably need around 150 rpm to start, I don't know much about the 7.3