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1999-2007 General Questions General questions related to 1999-2007 Super Duty trucks. If it doesn't fit the other categories, post it here. Gas engine discussion that pertains to all models is allowed. Specific gas engine questions should use the Gas Engines forum.

Thread: Another 7.3 rough idle till warm post. IPR? CPS? Injectors? Reply to Thread
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  Topic Review (Newest First)
09-06-2019 09:20 AM
Whiskey_helpz Seems as though I found my solution. Bad compression... No I'm just kidding it was injectors lol. Swapped out my old ones for remans yesterday. I let it sit over night in at about 40 degrees and she fired right up instantly. Better throttle response and definitely more power on the low end. Thanks for the help guys! Safe to say I'll be drinking to that 🙂
08-27-2019 12:44 AM
Whiskey_helpz It seems to have a bit of a lope to it especially the colder it is. At operating temp it still has a lope but alot less prominent.
08-26-2019 11:59 PM
klhansen IPR of 6% at idle is a bit low, but 480 psi ICP is good. That in itself would indicate a possibly partially obstructed edge filter.

But your ICP at max power of 2400-2600 psi is fine as well and IPR duty cycle of 60-65% is within limits for a stock tune.

Is it running OK?
08-26-2019 10:35 PM
Whiskey_helpz At wot @~70mph I'm getting about 2400-2600 icp psi and ipr duty cycle slowly climbs to about 60-65%
08-26-2019 10:12 PM
Whiskey_helpz Update. So I got an Edge Insight cts2 and have been monitoring it for about 2 days now. What should I be looking for in terms of monitoring? My ipr duty cycle is about 6% at idle. Icp sits at about 480 psi at idle. I've done alittle reading on other threads and those values seem low. Thank you for any input
08-18-2019 10:06 AM
Whiskey_helpz I tested the GPR and verified that it is working. I tested all 8 glow plugs and I am getting around 1.6-1.5 ohms. I have an app but the bluetooth obd2 scanner that i have isn't compatible with that specific app. I am currently waiting on one from Amazon but as you know I'm in Fairbanks and it takes alittle time for things to ship up here.
08-18-2019 09:08 AM
ArcticDriver Did you test the new GPR using the “No Start” instructions just to confirm its working?

So its still exactly like before? It starts quickly when the block heater is plugged in but does not start when not plugged in?

And you have inspected the ICP? Unless you replaced it yourself with a Motorcraft ICP then you can’t really be sure. New ICPs can fail. But the fact it runs good as soon as it turns over indicates the ICP has not failed completely.

You mentioned you had it scanned but did not mention the type of scanner. Most parts store code readers do not read Ford specific codes as was mentioned earlier.

You really need to download an App or buy a ScanGuage-2 and read some engine values or its just more throwing money after it and hoping to get lucky.
08-17-2019 03:07 PM
Whiskey_helpz https://s.amsu.ng/ngaRpsY9cMUN
08-17-2019 03:01 PM
This is a video of me trying to start the truck around 45 degrees out without being plugged in
08-17-2019 02:45 PM
Whiskey_helpz Update. I changed all 8 glow plugs. Tried to start it this morning, no luck. Had both batteries load tested and the guy at autozone said the were both at 100%. So far I've replaced the GPR, CPS, glow plugs, and changed the oil using 15-40 Rotella with Hotshot stiction eliminater. Has a new ICP from the previous owner. I've also cleaned the battery connections. Truck has some blowby but won't blow the cap off. If it is plugged in for a couple hours it fires right up at 45 degrees. Still racking my brain. Any help is appreciated.
08-14-2019 01:33 AM
Originally Posted by Whiskey_helpz View Post
How do I find this no start link?
Here's a direct link https://www.thedieselstop.com/forums...e-first-75094/
08-13-2019 11:30 PM
Big Horn Make sure you are on “Full Version” and not Mobile, then look at klhansen’s profile. You will see it listed- click on it and it will take you to the sticky note he has set up.
08-13-2019 10:28 PM
Whiskey_helpz How do I find this no start link?
08-13-2019 04:22 PM
ArcticDriver Did you follow the link “No Start” in KLHanson’s signature?

That eliminates any guesswork.

It sounds like you may have some GPs that need replacing but the only way to test is using those instructions in “No Start”.

Just to get you thinking of parts, you will want to stick with Motorcraft brand GPs and it might be worth doing all 8 if you are getting in there since they are only $9/each.

If you need a new GPR, then check out the Stancor-White Roger. Its big and outlasts the others based on the feedback forum.

Can be found here:


The “No Start” instructions will tell you what needs replacing.
08-13-2019 11:53 AM
Whiskey_helpz Update. So I was wrong in my previous post. The big post opposite of the constant has 11.5V when the key is turned on and slowly climbs to 11.9 over a few seconds.
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