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Thread: P1222 trouble code help Reply to Thread
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  Topic Review (Newest First)
11-22-2019 01:32 PM
BlazeKeeper
Quote:
Originally Posted by cerberusiam View Post
Rail PRV should have diesel in it, its job is to release excess pressure in the system. The problems start when the wear on the seat etches it and it won't seal, diesel being released at +24k psi will eventually etch the metal parts.
Well, that makes me think that my PRV MIGHT have been my issue. It appeared to be original, so if it was worn out that would allow excess fuel to flow through. Sound plausible?
11-22-2019 11:31 AM
cerberusiam Rail PRV should have diesel in it, its job is to release excess pressure in the system. The problems start when the wear on the seat etches it and it won't seal, diesel being released at +24k psi will eventually etch the metal parts.
11-22-2019 11:25 AM
BlazeKeeper
Quote:
Originally Posted by GRUNT 11B View Post
Did you ever put the new PRV in?

It's a good idea to always be ready or saving to buy an expensive part like injectors.
I put it in yesterday along with a new Bosch FCA.
11-22-2019 03:44 AM
GRUNT 11B Did you ever put the new PRV in?

It's a good idea to always be ready or saving to buy an expensive part like injectors.
11-22-2019 12:49 AM
BlazeKeeper Little update:

Oil sample came back perfect. No fuel, no excessive wear metal, the lab said it was great. Changed the FCA (to the person that severely stripped out the bolt that's incredibly hard to get to, I hope you're sorry for what you put me through) and the rail PRV. I seem to recall reading somewhere that the PRV being full of diesel was a sign that it's bad. Is that correct? Regardless, mine was full to the brim. Took it for a small test drive, and no light so far. Not sure it would come on after only 25 miles of driving anyway, but so far so good. Still mentally (and financially) preparing for injectors, but if I can wait a while on that it'd be nice.
11-19-2019 12:14 PM
GRUNT 11B Diesel can also get into the oil through a leaky seal in the CP3. That is not as common though.
11-19-2019 01:48 AM
BlazeKeeper Well, I took an oil sample and sent it off for testing. They'll do everything from checking for diesel in the oil, detergents, additives, wear metal, the works. It's a company I use often for work, so I trust their work. Should have results back by the end of the week. I assume that ANY diesel in the oil would indicate an injector problem, and thus resulting in the replacement of them?
11-17-2019 11:48 PM
BlazeKeeper Alright, finally made it home.

Dumped a bottle of Diesel Kleen in the tank and filled up. 149 miles later I stopped and filled up again to calculate mileage. 149 miles, 14 gallons = 10.64mpg. I'm no engineer, but I feel like that number should be higher.

Also, when the truck is idling (and at very small amount of throttle) I hear a faint tick/knock from under the hood, but at higher RPMs and at highway speed I don't hear anything. This is my first diesel, so I've never experienced it, but I've heard of something called injector knock. Could the noise I'm hearing be that?
11-17-2019 04:23 AM
GRUNT 11B If you contact Blackstone they will send you a container for your oil sample.
11-16-2019 11:53 PM
BlazeKeeper
Quote:
Originally Posted by GRUNT 11B View Post
Quote:
Originally Posted by BlazeKeeper View Post
How much does such a test cost? And what's the turnaround time?
$25 is what it cost me, but i think it went up to $28. I don't remember how long it took to get the results, but i don't think it was over a week.

Sent from my SM-G930V using Tapatalk
Oh, that's not bad at all. I'll definitely look at grabbing a sample this week and having it tested.

I'll be adding the PSD Diesel Kleen to a full tank tomorrow as I'm heading home (which will be about a 260 mile drive) so we'll see what happens. I'm still hoping this is just a clogged injector and a heavy dose of cleaner will fix my problem.
11-16-2019 11:48 PM
GRUNT 11B
Quote:
Originally Posted by BlazeKeeper View Post
How much does such a test cost? And what's the turnaround time?
$25 is what it cost me, but i think it went up to $28. I don't remember how long it took to get the results, but i don't think it was over a week.

Sent from my SM-G930V using Tapatalk
11-16-2019 11:42 PM
BlazeKeeper
Quote:
Originally Posted by steelhead1 View Post
Pull an oil sample after work, cooled off crankcase or burned arm. Wipe off drain plug area, spray clean with brake cleaner, wipe off again. 3>4 ounces in a sample bottle and ship off to Blackstone for diesel contamination in oil test. You can't tell 5 or even 10% fuel dilution in oil but their lab test equipment can.
May save you a titttes up motor
How much does such a test cost? And what's the turnaround time?
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