Ticking when coming to stop

[FORDGURU]

Wondering if mine is the only one
after driving let’s say 45 mph. As I come to a stop and it starts down shifting right about 5-10 mph and I want to say before it does back into second I hear what sounds like lifter tick. only noticeable with window down
just curious if any one else has heard it on theirs

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[DwnSth]

Mine does something like this especially at idle. if I put in neutral and tap the fuel pedal it mostly goes away at the slightly higher idle. always thought it was just a diesel thing.

 

[ALeeL]

You might be hearing the DEF injector. They have a noticeable tick to them as they operate.

 

[morlan52]

Mine has done this quite frequently. Only ever while decelerating and downshifting at certain RPMs. I've always chalked it up to normal diesel noises. There's a bunch of folks over on the RAM 1500 Diesel forums who say theirs make the same noise. I wouldn't worry too much about it.

 

[mtran]

does it sound like this?

 

[AC77]

mine has been doing this from day one, each and every time coming to a stop/downshifting, to me it sounds like engine brake ...

 

[Gorilla57]

mine has been doing this from day one, each and every time coming to a stop/downshifting, to me it sounds like engine brake ...

There is no "engine brake" feature on a stock 3.0L diesel. Only way to get it is a tune.

 

[AC77]

There is no "engine brake" feature on a stock 3.0L diesel. Only way to get it is a tune.

has a tiny tiny engine break

 

[Gorilla57]

has a tiny tiny engine break

If you are referring to compression braking, then yes it does. But there is no true turbo or exhaust brake feature on the 3.0L, I really wish there was there was. Loved my 1500 with the 3.0 and it would have been even better with an exhaust brake button. Ram and Jeep screwed up with "forgetting" this feature.

 

[Ratbert]

If you are referring to compression braking, then yes it does. But there is no true turbo or exhaust brake feature on the 3.0L, I really wish there was there was. Loved my 1500 with the 3.0 and it would have been even better with an exhaust brake button. Ram and Jeep screwed up with "forgetting" this feature.

All we have is backpressure from the turbo to kind of fake it, right? As far I as know there's no compression braking w/o a throttle body / Jake brake.

A tune won't change that. It can tweak how the turbo behaves, but it can't magically introduce compression braking.

Standard disclaimers apply

 

[Gorilla57]

All we have is backpressure from the turbo to kind of fake it, right? As far I as know there's no compression braking w/o a throttle body / Jake brake.

A tune won't change that. It can tweak how the turbo behaves, but it can't magically introduce compression braking.

Standard disclaimers apply

Compression braking comes from the engine going through its 4 stroke cycle without adding fuel to it. So, during the compression cycle, there is no fuel introduced and the resistance slows the RPM. Hence the name, compression braking. The back pressure from the turbo will cause exhaust braking, meaning when the exhaust valve is opened, there's pressure limiting the piston from coming up to TDC. A tune will force the veins on the turbo to close and increase this backpresssure from the turbo, which is what they do on the Cummins and it works very well. A throttle body limits what enters the cylinders, a variable vein turbo limits what leaves the cylinders. Both gas and diesels will have compression braking when no fuel is added.

 

[AC77]

If you are referring to compression braking, then yes it does. But there is no true turbo or exhaust brake feature on the 3.0L, I really wish there was there was. Loved my 1500 with the 3.0 and it would have been even better with an exhaust brake button. Ram and Jeep screwed up with "forgetting" this feature.

I was joking about the tiny tiny portion. Lol

but ! I just learned something new from our beloved diesels

 

[grimmjeeper]

Compression braking comes from the engine going through its 4 stroke cycle without adding fuel to it. So, during the compression cycle, there is no fuel introduced and the resistance slows the RPM. Hence the name, compression braking. The back pressure from the turbo will cause exhaust braking, meaning when the exhaust valve is opened, there's pressure limiting the piston from coming up to TDC. A tune will force the veins on the turbo to close and increase this backpresssure from the turbo, which is what they do on the Cummins and it works very well. A throttle body limits what enters the cylinders, a variable vein turbo limits what leaves the cylinders. Both gas and diesels will have compression braking when no fuel is added.

A lot of "compression" braking comes from a closed throttle body. Not only is the engine compressing the air in the cylinder but the intake is drawing in air through a closed throttle body. Compressing air in the cylinder isn't all that effective at resisting motion. Nowhere near as much as closing off the airflow altogether.

Diesels don't generally have a throttle body. So they're not great at compression braking. My old 01 Ram with the 24 valve 5.9 and manual wouldn't slow down a load going downhill very well at all just doing engine braking. Everyone with a diesel back then added an exhaust brake to help. Those are a butterfly valve in the exhaust piping after the turbo. Most were manual but some automatic ones were made.

Now that variable pitch turbos are common, the engine computer uses them to enhance braking automatically as they essentially accomplish the same thing. They block air flowing through the turbo.

True engine braking is a mechanical feature of the engine in big rigs. It alters the valve timing a whole lot to change the airflow through the engine and is very effective. But it's complicated (i.e. expensive) and loud. Those "Engine braking prohibited" signs are focused on big rigs. Anyone who has heard one knows how much louder it is.

 

[AC77]

A lot of "compression" braking comes from a closed throttle body. Not only is the engine compressing the air in the cylinder but the intake is drawing in air through a closed throttle body. Compressing air in the cylinder isn't all that effective at resisting motion. Nowhere near as much as closing off the airflow altogether.

Diesels don't generally have a throttle body. So they're not great at compression braking. My old 01 Ram with the 24 valve 5.9 and manual wouldn't slow down a load going downhill very well at all just doing engine braking. Everyone with a diesel back then added an exhaust brake to help. Those are a butterfly valve in the exhaust piping after the turbo. Most were manual but some automatic ones were made.

Now that variable pitch turbos are common, the engine computer uses them to enhance braking automatically as they essentially accomplish the same thing. They block air flowing through the turbo.

True engine braking is a mechanical feature of the engine in big rigs. It alters the valve timing a whole lot to change the airflow through the engine and is very effective. But it's complicated (i.e. expensive) and loud. Those "Engine braking prohibited" signs are focused on big rigs. Anyone who has heard one knows how much louder it is.

thank YOU for this breakdown , appreciate it grimm

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