P02E8 Diesel intake air flow “a” position sensor circuit low

[vijith555]

Originally Posted by drover

Does sort of sound like the flap is sticking, interesting to see if my thoughts on gummed up gears was on the money or not... Hope its nothing too serious... If it is the flap gearing then that Italian mob is the less expensive way to go otherwise its the whole housing I believe.

I hope so too mate. Hopefully this guy could find something in that short span of time.

But I should have mentioned before the only times I have had the car struggling to start for few seconds was on times where I cut the engine in 2-5 minutes of a cold start and tried starting right away. And I can put money I could consistently replicate the difficult start issue by doing this on cold starts.

Let's see what I hear from the mechanic tomorrow. I am hoping they try their best to visually inspect that area instead of just saying it's gone.

[vijith555]

Sad to report the visit to this mechanic was a complete waste of time!

The bloke did not even come near my car and just looked at the error code on a screenshot I took and just said they will need to replace the throttle body nothing else will fix that. No point taking the hose off to clean anything apparently and the flap in there should not be touched apparently.

He also mentioned the plastic gears or tooth we talk about is not part of throttle body but lives in manifold area under the engine and since I did not get manifold errors there is no point of even looking at that. I don't believe him fully.

One of the reasons why I don't think what he is saying is right is the fact that on these cars if the throttle body is gone bad, there is a separate warning indicator on the dash for electronic throttle failure which is when most people look into it. On the RAMS when this happens they have stalls and loss of power - I have none of those symptoms and no issues accelerating. One thing he mentioned is this particular failure is not common on the Jeeps though. So yeah my luck worked here. Still don't believe the throttle body needs replaced completely but he reckons this is some sort of an electrical malfunction on the throttle body itself.

This guy was fixated on giving me a secondhand throttle body fitted for $660. Book it in and we will get it done. I was thinking why did I even go there if that is all he had to say.

[Treebreakerbob]

One article I read said the diasfps is also the maf sensor and a common fault is the egr gasket can need replacing

Does the mil illuminate when engine is at idle or when driving?

[drover]

Originally Posted by vijith555

Sad to report the visit to this mechanic was a complete waste of time!

The bloke did not even come near my car and just looked at the error code on a screenshot I took and just said they will need to replace the throttle body nothing else will fix that. No point taking the hose off to clean anything apparently and the flap in there should not be touched apparently.

He also mentioned the plastic gears or tooth we talk about is not part of throttle body but lives in manifold area under the engine and since I did not get manifold errors there is no point of even looking at that. I don't believe him fully.

One of the reasons why I don't think what he is saying is right is the fact that on these cars if the throttle body is gone bad, there is a separate warning indicator on the dash for electronic throttle failure which is when most people look into it. On the RAMS when this happens they have stalls and loss of power - I have none of those symptoms and no issues accelerating. One thing he mentioned is this particular failure is not common on the Jeeps though. So yeah my luck worked here. Still don't believe the throttle body needs replaced completely but he reckons this is some sort of an electrical malfunction on the throttle body itself.

This guy was fixated on giving me a secondhand throttle body fitted for $660. Book it in and we will get it done. I was thinking why did I even go there if that is all he had to say.

The plastic gears are what moves the butterfly valve and he was clearly thinking of the swirl flaps in the manifold, I don't think they are the problem but I could be in error, the butterfly valve we think is the problem has nothing to do with regulating fuel/speed/revs as far as I can tell its solely to allow the engine to suck in exhaust to the manifold..... No parts other than a whole new unit are available from FCA, the gear replacement parts are aftermarket item which he may not know about but in the end he did agree that its the butterfly valve failure so there's that................ so basically replace the whole unit or replace the gearing but a good look first to see if anything jamming or teeth missing is really needed......... I don't prescribe in the theory of replace parts until the problem goes away ....

[TR Laredo]

Originally Posted by vijith555

Sad to report the visit to this mechanic was a complete waste of time!

He also mentioned the plastic gears or tooth we talk about is not part of throttle body but lives in manifold area under the engine and since I did not get manifold errors there is no point of even looking at that. I don't believe him fully.

One of the reasons why I don't think what he is saying is right is the fact that on these cars if the throttle body is gone bad, there is a separate warning indicator on the dash for electronic throttle failure which is when most people look into it. though. So yeah my luck worked here. Still don't believe the throttle body needs replaced completely but he reckons this is some sort of an electrical malfunction on the throttle body itself.

.

Well he got it half right - yes there are plastic gears in the manifold area but they are for the swirl flap motor actuator. There are also plastic gears located in the throttle body assembly which can be replaced. When I had the service electronic throttle warning/ constant check engine light (yellow) back in 2018 it related to the MAF sensor failing (replacement required) / electronic values going out of range which was picked up by the PCM (Powertrain Control Module).

Cheers

[vijith555]

Originally Posted by Treebreakerbob

One article I read said the diasfps is also the maf sensor and a common fault is the egr gasket can need replacing

Does the mil illuminate when engine is at idle or when driving?

The yellow CEL only comes on some days at ignition time mostly on cold starts. And stays on during the driving with no performance impacts or power loss.

The CEL clears itself after a few ignition cycles sometimes and then you get a few days of driving till it comes back on.

I have never got the red electronic throttle control light on during a drive and always have been the P02E8 code. I can reset the code using Jscan and drive for a day or two before it comes back.

Hoping it is not as bad as an EGR gasket. Have not touched the MAF sensor probably worth trying to take it out and do a clean?

[vijith555]

Originally Posted by drover

The plastic gears are what moves the butterfly valve and he was clearly thinking of the swirl flaps in the manifold, I don't think they are the problem but I could be in error, the butterfly valve we think is the problem has nothing to do with regulating fuel/speed/revs as far as I can tell its solely to allow the engine to suck in exhaust to the manifold..... No parts other than a whole new unit are available from FCA, the gear replacement parts are aftermarket item which he may not know about but in the end he did agree that its the butterfly valve failure so there's that................ so basically replace the whole unit or replace the gearing but a good look first to see if anything jamming or teeth missing is really needed......... I don't prescribe in the theory of replace parts until the problem goes away ....

I totally agree with checking to see what could be affecting the part than full replacement like you said. Just say you could replace a whole part and then the problem could come back and then you realise something else was really the problem. Because this could solely happen due to bad sensor/electronic readings too..

he did say that mostly this problem is electrical bugs so cleanups and visual inspections dont help hence the whole part being replaced. I am still thinking it is something stuck or sensor reading bad. Has happened so many times now I can almost tell it happens when the ambient temp is colder. On hot summer days it does not happen at all. So a sensor might read wrong when the ambient or engine temp is hot?

If I get the courage to take the MAF out for a clean I would do and also my fear is if i take the hose in front of throttle body out, i might not be able to put the clips back on properly hence looking for someone around who doesnt just want to replace things. I think if I dont get to inspect this either myself or by someone, I am going to put it into a service place and ask them to do a full visual plus electronic diagnostic to confirm where the problem is. P02E8 errors are checked by a series of electrical tests to confirm which area it is originating from and I am sure someone who knows how to do readings could pin point. I am only a few thousand kms from my next oil change.