Code 4726

[Signature620]

When you shut the truck off for a leak test, turn the key back to ON right as the engine stops rotating and you won't lose Insite connection.

While you wait to source the blanking nuts, why don't you re torque all the high pressure connectors?

[Bama Boy]

I turn key to off positio and as soon as engines stops I turn back to right, and it pretty much loses connection everytime. I'm not at home with torque wrench or I would try tightening all fittings. I am going to get cap nuts tomorrow. Maybe I can do video and give to Rawze, he could put audio to it.

[Bama Boy]

Well after waiting for dealership to open this morning, they only had 1 cap nut not 5 like they told me on phone. Well I hope I don't have more than 1 injector leaking, I may be able to find it. But on the bright side, mil light has not came back on since I put relief valve on.

[tree98]

(09-12-2020 )Bama Boy Wrote:  But on the bright side, mil light has not came back on since I put relief valve on.

Maybe you got lucky. Order the other 5 caps so you have them for next time.

[Bama Boy]

Yes sir that is my plan. THX

[Dream Big]

i have the 4726 code and 1139 please help prv is good

[Rawze]

(12-11-2025 )Dream Big Wrote:  i have the 4726 code and 1139 please help prv is good

1139 = Injector for cylinder #1 is failing.

4726 = excess fuel leakage at the rail.


-- Do an injector leak-down test to see if it passes. Fix the issues until it does.
info: https://rawze.com/forums/showthread.php?...3#pid75483

-- Replace the exhaust gas pressure sensor (use OEM sensor only) + clean out its passage between it and the exhaust manifold.

-- If the engine has a delete program in it, then copy it out ans e-mail it to me for a review of what someone did in there. Bad programming is a plague and most people would swear nothing is wrong until it causes severe engine damage, and then its too late.