P0300

[Brokenteck50]

So... what does this have to do with cruise control and the P0300 code?? I thinks many of us can agree that the "technicians " that work at dealers are not mechanics of the past, but you are claiming you know how to correct this issue plaguing many but give no proof and then posting a thread asking why they don't have a fix yet. Can you see where this is going?

I believe the over rev damaged the timing chain and phasers

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[GlacierGladiator]

I believe the over rev damaged the timing chain and phasers

So your P0300 was caused from the over rev? This is not the situation that have caused all the other P0300 issues discussed here so yours is a isolated issue. Go read what others have posted before claiming to have a "fix".

 

[Brokenteck50]

So... what does this have to do with cruise control and the P0300 code?? I thinks many of us can agree that the "technicians " that work at dealers are not mechanics of the past, but you are claiming you know how to correct this issue plaguing many but give no proof and then posting a thread asking why they don't have a fix yet. Can you see where this is going?

For one thing I am talking about my vehicle and it seems odd that I don't see resolution to many of these p0300 post, what I'm saying is that all problems can't be diagnosed remotely

 

[Brokenteck50]

So your P0300 was caused from the over rev? This is not the situation that have caused all the other P0300 issues discussed here so yours is a isolated issue. Go read what others have posted before claiming to have a "fix".

And again I'm speaking of my vehicle if I made you think I have a fix for all the p0300 then I apologize it was not my intention

 

[DAVECS1]

You throttle is oscillates in the driveway. If you take the air intake pipe and have someone press on the throttle, you will see it does nothing like you intend it to. You may even see it osscilate. I have about 75 traces of it happening.

 

[LostWoods]

I believe the motor should not gone to 6300rpm for over a minute, I was unable to shut down the cruise system, maybe the timing chain and the phasers can handle that kind of rpm but until i hear an engineer tell me that's normal I will stick to my guns, and yes I spelt tech wrong, when I get done with the legal crap I will post all work orders so I can point out to you where thier mistakes are and why after 4 months they can't figure out what the problem is

The only way that this happened is if you have a completely fucked CAN system and something froze/shorted. Cruise has half a dozen failsafes and if the system detects an issue with any of the inputs, it disables the system.

 

[Brokenteck50]

I was warned by another member about trolls - guess I'm in the habit of feeding them! LOL

A tech that can't spell tech............ and the crazy attorney reference, wow, should have seen that one coming. That, or a former tech got a bit into the eggnog

Sorry for my spelling, when you go thru the lemon law

The only way that this happened is if you have a completely fucked CAN system and something froze/shorted. Cruise has half a dozen failsafes and if the system detects an issue with any of the inputs, it disables the system.

I am aware of that but the fact still remains it reached 6300 rpm, the question i have is that enough to do damage to the motor,

 

[TroutFishingInAmerica]

The "red line" on the tachometer is at 6500 rpm, but that's really meaningless. I'm sure there is a rev limiter, I have no idea what it's set at, I've never hit it. Anyone have a clue as to where the rev limiter is set?

Sorry for my spelling, when you go thru the lemon law

I am aware of that but the fact still remains it reached 6300 rpm, the question i have is that enough to do damage to the motor,

 

[redrider]

As a 30 year diagnostic teck its hard to watch them butcher my gladiator for 4 months. I know what is wrong with my gladiator and what caused the problem but getting the factory to swallow there pride and listen to me has been impossible, p0300 is a difficult code to deal with especially when you are dealing with tecks that have to be told what to do and are unable to apply basic diagnostic strategies , odd that we don't see what is fixing p0300,

I started out in the USAF as a 2 way Radio Electronics Technician in 1976. Component level repairs. That would be a Tech with an "H" and your assessment of modern tech ability mirrors my experiences as well. YouTube can fix anything.

 

[MrZappo]

Cruise control can definitely trigger a multiple misfire code. The culprit in my opinion is the throttle body air flow model. At high loads under light throttle the control oscillates quite a bit. Cruise lives in this space and on top of that it is another control. From the data I have gathered the throttle body gets into a pretty high frequency osscilation like jamming your foot on and off the throttle 30 times a second. This air flow caused some detenation which os then made worse by the timing being reduced to fight load knock that is not there. I currently have a revision of my calibration that gets into pretty intense throttle oscillation issues. I am using it to study the situation. My guess is fca knows the issue but the fix is not simple with the current software architecture. The throttle control does not have enough strategy to account for all operating conditions.

OK so help me understand something.

Are you saying that all 3.6 pentastar engines do this and that some are just worse?

If the current software architecture does not allow for a simple fix than why are most engines not experiencing this issue?

From the way you are explaining it, it sounds like a design issue that would cross the entire product line. It does not sound like you are saying that these particular engines have a different physical manufacturing defect that is the root cause.

Can you clarify please?

 

[iammacey]

This entire thread feels like poorly done satire.

- I know why these codes are happening
- I can't talk about it. Attorney.
- I will continue to talk about it. Much vague.
- What? Oh. No. I am only talking about my vehicle that I can't talk about. Overrev. Cruise control. Let me talk to "starrrr".

How do I get sucked into these? It's as though the crazier it starts the more committed I am to see the ending. And the more frustrated I get as I read it.

 

[redrider]

Easy. The interwebs have made every one an infallible expert on every thing from thumbtacks to spaceflight. I am a bottle rocket scientist.

 

[LostWoods]

OK so help me understand something.

Are you saying that all 3.6 pentastar engines do this and that some are just worse?

If the current software architecture does not allow for a simple fix than why are most engines not experiencing this issue?

From the way you are explaining it, it sounds like a design issue that would cross the entire product line. It does not sound like you are saying that these particular engines have a different physical manufacturing defect that is the root cause.

Can you clarify please?

Oscillation is completely normal on some readings because there are multiple throttle position sensors now that things are throttle by wire and there's no dedicated idle control motor like you'd find on a cable system. Each sensor is reading in its own way as a failsafe mecahnism so it's not read the traditional linear way where .25v was closed and 4.8v was wide open.

 

[DAVECS1]

This oscillation is not normal and it is not just throttle. The issue is a design issue across the product line. you have multiple closed loop controls with no caps on them and they have the ability to find areas of instability that cause the engine to think it is malfunctioning, and in some cases cause it to malfunction.

I have include two screen shots, I have a dozen more. One shot is of the truck idling warming up, and the instability happened quickly and went away once the temp increased. look at what happens to air flow, timing and RPM. That will throw a misfire if it happens long enough.

The other picture is data I took troubleshooting this problem. Notice my speed is steady and constant. But airflow starts to oscillate with relatively little to no pedal position change. Once it gets going it starts to jump the timing and airflow on the throttle. Once a real pedal input is given it goes away.

You can call me an arm chair quarter back and dismiss me if you want. I could care less. I am fixing my Jeep I don't need any help from FCA. I just thought I would share what I know so others can get a better picture of what is happening to their Jeep. ALL in all it is not destructive if you don't let it operate like this. I would make my dealer rest all the adaptive learning when you take it in to get the code cleared. This may get you out of the woods for a while or forever once they do the software updates.

 

[redrider]

And they spent how many years and how much money to get this truck on the road? Maybe things will be sorted by the time the 22s come out. Not buying one until then.

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