Hi Folks

trying to determine if I can use a CM5126 IPR valve in place of a CM5054

I found websites stating the CM5154 is an upgrade, yet other sites keep selling the CM5054 next to the CM5126. Why do that if the CM5126 truly is an update??

found little info

quick story:
Ford F-250 6.0, 210k miles

Blue spring fuel pressure
Arp studs
Upgraded standpipe, dummy plugs
Egr delete

Blew #4 top injector seal .. hard start leading into no start
Replaced all injector cup seals, loose cup
Replaced all injector top seals in place
Rebuild turbo, incl. oil line updates.

Air test at 100 psi shows holding pressure, no leaks found after repair

Changed ipr valve .. diff model nr., website said it was an update to the older model. From CM5054 to CM5126

On restart ran rough, to be expected but ICP value was ~835 psi on idle... I knew this was a default for ICP sensor problem/disconnected sensor, found this before when I tried starting without ICP connected
P2284 Sensor circuit range/performance error
Reseated connector and coated contacts with Stabilant 22

Ran hard on interstate
Now idles fine 600 - 625 psi 14.5ish%

However I have a miss when cold, rough running, till warmed up, even then slight missin1000 1500 rpm range, like when pulling away from a traffic light

FEELS LIKE sticksion, but never had problems before.
No error codes set, for contribution error or anything else.

 

Hmm, nobody knows the answer??

 

Here a quick update on my findings

The winner, or loser, turned out to be a sticking new IPRvalve.

For all practical purposes the problem appeared as one or more sticking injectors after I replaced top seals, injector cups and rebuild my turbo. As I was that far into it I replaced the IPR valve with a new one for good measure. Out came the CM-5054 and in went a CM-5126

Symptoms included rough running when cold, getting better when warming up with an occasional P2284 Sensor circuit range/performance error thrown in.
I used AR9100 at the last oil change in October, bought Rev-X a few weeks ago to see if it would eliminate the perceived sticksion.

After driving around for 2 weeks, my symptoms improved somewhat, rather than driving for 10 miles before the car would run/idle without grumbles, it now took about a mile and a half.

Still, some starts were real rough and a P2284 would show up

Using 2 apps on my phone, Torque and ForScan I tried to find out what was going on

My first clue was that the IPR percentage always wanted to go down to the 14% range especially on low idle, coasting, then I had a lucky break in that twice in a row, whilst observing IPR and IPC values in graph mode in ForScan, the car had rough idle directly after start-up. KOEO, the IPC volts would be 0.25V and the IPR at 14.8% but immediately after start the IPC would jump to about 4.5 volts with the IPR still at 14.8%. Whoa there big guy, a wee bit much on the oil pressures. I tested the IPC which I suspected next but it was deemed functional.

After eliminating about everything else, I came full circle back to the new IPR valve. Reading the forums I started to suspect the filter in the new IPR valve to be clogged, a not uncommon thing after working on the oil system. The new IPR valve was pulled, came out with a clean filter. A borrowed older IPR valve was installed and lo and behold, truck idled fine cold, hot,made no difference, no more sticksion symptoms.

So hopefully, all is well that ends well, a new IPR valve is one the way to replace the borrowed one.

 

So did the newer CM-5126 work? Did you install another one? Was the borrowed one the CM-5126 or the CM-5054? I'm needing to replace my IPR on my 2004 6.0. I would like to know if the CM-5126 works. Your answer is not definitive.