P0300 Code - New Cam Shaft?

[Lost1wing]

Oil pressure didn't change, and even if it did, it won't change a physical tick due to wear.
It's still, from day one, regulated at the same pressures, and the high volume solenoid kicks the oil pump into high at the same RPM.

Phasers only handle cam timing, not the valve lift. you can advance or retard the intake valve timing, but the physical parts still do the same job with the same wear.
If your LP has a bad spot in a groove, you can rotate it on the platter, but it's still going to come under the stylus. You just changed when, not how.
(I watch the oil pressure as well as other engine and vehicle indicators fairly closely - and have on all of my vehicles. It's why I have the rally gauges in my SX4 and the AMX cluster in my Javelin)

the update can't make a tick go away. It's simply impossible. There's nothing a PCM can do to make physical damage disappear. If you arrive with a tick, you leave with a tick. It doesn't matter what people say - could be a placebo effect, hey, I don't notice it now - but it will still be there because you can't alter physical damage with software.
30 psi is more than enough for an idling engine. 20 is plenty for idle for that matter, even for a larger engine with a lower volume pump. Pressure doesn't lubricate valve train parts. 10 psi will send oil shooting over a fender.

No no, I agree with the placebo effect. I'm not so sure on the oil pressure theory. Yes, 10 psi will make a mess. 50 psi will make more of a mess. Oil solenoid could be opened earlier or later dedending on the program. If this is modified to happen at different rpms than originally designed, more oil could be supplied during high lift. No way Stellantis will admit to a design flaw.

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[ShadowsPapa]

No no, I agree with the placebo effect. I'm not so sure on the oil pressure theory. Yes, 10 psi will make a mess. 50 psi will make more of a mess. Oil solenoid could be opened earlier or later dedending on the program. If this is modified to happen at different rpms than originally designed, more oil could be supplied during high lift. No way Stellantis will admit to a design flaw.

It's always been at ~3,000 RPM for the upgrade That hasn't changed as far as what I've owned and driven or per any documentation.

The suggested performance mapping of oil pressure is 10 psi/1,000 RPM
So, running 30 psi up to 3,000 RPM is spot-on.

Each Jeep we've had with these engines has done the exact same thing - oil pressure climbs at 3,000 rpm, drops back down under 3,000 RPM. That goes back to vehicles before 2020 that we've owned.

High lift can be triggered by the PCM even as low as the lower 2,000s RPMs if there's enough load on the engine (and it's one reason I tell people - STOP WITH THE LOW RPM CRAP - let it wind up!)

 

[Stan H]

the TSB couldn't possibly make a tick go away. If it's worn to the point of a tick, that tick is there forever. How can a PCM change make a physical sound of worn parts go away? Ticks don't just go away.

Yep ya have to pull em off only way that thing went that long is it got a tick. And was parked soon afterwards.
But assuming it all just started ticking I would say that the cost will be on the owner. Best world scenario buy the parts ,find a buddy and install them yourself save about 500.00 in labor.

 

[ShadowsPapa]

Yep ya have to pull em off only way that thing went that long is it got a tick. And was parked soon afterwards.
But assuming it all just started ticking I would say that the cost will be on the owner. Best world scenario buy the parts ,find a buddy and install them yourself save about 500.00 in labor.

A tech who knows their shit knows that you can trigger the followers into high lift mode or out of high lift mode with the correct tools and knowledge. So you have a vehicle with the tick, you check all of the readings (as some videos here have shown being done) and you force the rockers to change modes and see how it sounds. If it's the high lift center portion slapping on the cam lobe due to wear, it should totally change the sound. If not, it's less likely to be a cam, IMO.

 

[Jrgunn5150]

30 psi is more than enough for an idling engine. 20 is plenty for idle for that matter, even for a larger engine with a lower volume pump. Pressure doesn't lubricate valve train parts. 10 psi will send oil shooting over a fender.

I have a 65 Ford with a 352 that has shown 0 psi at idle on multiple gauges since 1984 that I know of.

Just drove it two weeks ago lol.

"Enthusiasts" have a strange fixation on oil and pressures lol. You have enough, or not enough, and if you have not enough, it becomes obvious quickly.

 

[Lost1wing]

It was triggering for misfires when there were not any misfires.
As far as a cam - once that thing is worn to the point of a misfire - it's not going to go far at all and there will be noise.

It was literally for preventing people coming in with a MIL for nothing at all.
A bad cam will show in other strange readings, and - a noise.
It wouldn't change how soon someone reported in with a cam issue. Other signs will be there.
A cam in a legacy engine can be really bad before a misfire will be felt or detected - they detect a misfire at the drop of a hat.
My 2022 reported a misfire - but the engine was running smooth as silk, not a wobble, you literally felt like everything was perfect in sound and feel and power - yet it detected misfires.
So - all they did was lessen the chances of a false report, they didn't lower the threshold for a true misfire. IF the cam is bad enough to cause a legit misfire - it's toast already.

The TSB didn't take away legit misfires at all. Only false misfire readings.
Bad cams would still be found at the same rate, and same point in time.
Worn intake cams are generally shown in odd O2 readings, the PCM compensates for the lower oxygen content - to a point. When it can't, there's a misfire. So - no, it wasn't kicking a can down the road.

A tech who knows their shit knows that you can trigger the followers into high lift mode or out of high lift mode with the correct tools and knowledge. So you have a vehicle with the tick, you check all of the readings (as some videos here have shown being done) and you force the rockers to change modes and see how it sounds. If it's the high lift center portion slapping on the cam lobe due to wear, it should totally change the sound. If not, it's less likely to be a cam, IMO.

I saw that tool for sale. Basically just an adaptor in place of the oil control solenoid. I thought it to be about as much work to just pull the valve cover to have a peak. You may put in an extra hour pulling the valve cover, but at least you can put your eyes on the cam and not have to rely on deaf ears.

 

[mfran12345]

Still no update on when the part will be in. Anyone have any inside info to share? Am I going to be waiting months? It’s been 2 weeks now with no estimate dates. They did say they’ll pay for a portion of the repair, if the part ever comes in.

 

[MPMB]

Still no update on when the part will be in. Anyone have any inside info to share? Am I going to be waiting months? It’s been 2 weeks now with no estimate dates. They did say they’ll pay for a portion of the repair, if the part ever comes in.

Any update? I actually ordered the kit myself and got it about a week after I ordered it instead of the estimated mid-August ship date.

 

[mfran12345]

Any update? I actually ordered the kit myself and got it about a week after I ordered it instead of the estimated mid-August ship date.

It was just delivered to the dealer. Install scheduled for next week. Hope it goes well and nothing terrible is found when the top of engine comes off.

 

[ShadowsPapa]

It was just delivered to the dealer. Install scheduled for next week. Hope it goes well and nothing terrible is found when the top of engine comes off.

You are already looking at a cam replacement? What else terrible could be found?
All they pull is what's necessary to access and remove the valve cover and replace the camshaft sitting on the top of the head.
Not much else up there.

 

[MPMB]

You are already looking at a cam replacement? What else terrible could be found?
All they pull is what's necessary to access and remove the valve cover and replace the camshaft sitting on the top of the head.
Not much else up there.

Well...

Christine was a Plymouth, so...

 

[ShadowsPapa]

Well...



Christine was a Plymouth, so...

Now THAT is scary, especially to anyone with coulrophobia

I wonder what the term is for the rational fear that some clown last worked on your Jeep?

 

[Lost1wing]

Now THAT is scary, especially to anyone with coulrophobia

I wonder what the term is for the rational fear that some clown last worked on your Jeep?

An evil clown or the wrong cam installed.

 

[yoda13]

Both

 

[Stan122]

2025 and 5k Miles, P0300 code brought it in, camshaft replacement, what the heck

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