Hello,

I have purchased a fiesta zetec s few months ago and ive recently noticed a knocking sound coming from the engine. This car has the 1l ecoboost.

What ive also noticed is that the knocking sound is only there when the car is in neutral and the engine is warmed up and drops to around 900 revs. As soon as i put the car in gear the knocking sound goes away.

Can anyone help?

40 minutes ago, unsaltedshoes said:

noticed a knocking sound coming from the engine. This car has the 1l ecoboost.

Not much more needs to be said. 🙁

 

27 minutes ago, unofix said:

Not much more needs to be said. 🙁

 

Do you know what the issue could be?

Sadly I suspect that you have the very common issue of the wetbelt falling apart and bits of the belt clogging up the oil ways, leading to oil starvation of critical engine components. Once a 1.0 Ecoboom engine starts to fail, it's already too late to try and save it.

9 minutes ago, unofix said:

Sadly I suspect that you have the very common issue of the wetbelt falling apart and bits of the belt clogging up the oil ways, leading to oil starvation of critical engine components. Once a 1.0 Ecoboom engine starts to fail, it's already too late to try and save it.

Oil light isnt on and doesnt stay on when i start the engine though and its only got 54k miles on it.

Why would it be too late to repair or get it fixed if that is the issue?

As @unofix says, suspect belt degradation, if you're quick you'll save it.

Budget for a new Turbo and Vacuum pump too as it will have killed those if nothing else

Romano, have you tried to isolate where the 'knocking' is coming from? This type of problem is very difficult for anyone to diagnose without access to the car.

Could you make a short video to highlight what type of knocking you can hear?. When you say the knocking disappears when you put it in gear, is that because you have increased the revs? 

Does the knocking disappear if you put it in gear, with the clutch pedal depressed, without increasing the revs?

On 9/14/2024 at 11:56 AM, RayC333 said:

Romano, have you tried to isolate where the 'knocking' is coming from? This type of problem is very difficult for anyone to diagnose without access to the car.

Could you make a short video to highlight what type of knocking you can hear?. When you say the knocking disappears when you put it in gear, is that because you have increased the revs? 

Does the knocking disappear if you put it in gear, with the clutch pedal depressed, without increasing the revs?

hi ray,

yes the knocking disappears when i put the car in gear with the clutch down obviously and without increasing the revs it goes away. when i put it back in neutral you can hear a knocking sound only when its idling in neutral. im not sure if its coming from the engine though because when i rev the engine it sounds completely normal.

10 hours ago, unsaltedshoes said:

Yes the knocking disappears when i put the car in gear with the clutch down obviously and without increasing the revs it goes away. when i put it back in neutral you can hear a knocking sound only when its idling in neutral. im not sure if its coming from the engine though because when i rev the engine it sounds completely normal.

When I do the same on my car I get a distinct change of noise from the engine area. 

Not sure what causes that but obviously by pressing the clutch we are disengaging direct drive to the gearbox.

I don't hear a knocking as such but it is noisier. 

I personally don't think it's a problem in the engine itself, but possibly the DMF or clutch assembly. 

Hopefully another member can advise further.

 

 

 

 

The description does sound a bit like DMF knock.  But there isn't a DMF in the Mk7 Fiesta 1.0 EcoBoost.

The Mk3 Focus 1.0EB's do get a DMF with the 6 speed gearbox (125 or 140bhp).

1 hour ago, TomsFocus said:

But there isn't a DMF in the Mk7 Fiesta 1.0 EcoBoost

Sorry, assumed it would be the same as my Focus 🤭

Interestingly, not all the Focus's got one either.  The 100ps versions came with the same 5 speed gearbox as the Fiesta, so no DMF on those.

Must admit I'm struggling to think of anything that fits the exact description above though.  As you say, the engine is disconnected with the clutch down, so while stationary there shouldn't be any rotational gearbox movement in either neutral or 1st gear.

There isn't a gear position sensor on this gearbox so the PCM won't know whether a gear is selected or not.  That just knows when the clutch is down, so would affect both N & 1 in the same way.

2 hours ago, TomsFocus said:

The description does sound a bit like DMF knock.  But there isn't a DMF in the Mk7 Fiesta 1.0 EcoBoost.

The Mk3 Focus 1.0EB's do get a DMF with the 6 speed gearbox (125 or 140bhp).

Do you have any idea on what it could be? a lot of people are telling me that its the wet belt causing the engine starve of oil but it doesnt make sense how it would only knock on idle in neutral and not when im moving or revving the engine.

Also, ive taken the car to the dealership i bought it from and a ford garage and they have both told me its one of the quietest ecoboost engines they have heard 😂.

5 minutes ago, unsaltedshoes said:

causing the engine starve of oil but it doesnt make sense how it would only knock on idle in neutral and not when im moving or revving the engine.

Engine oil pressure is lower at idle

2 hours ago, unsaltedshoes said:

Do you have any idea on what it could be? a lot of people are telling me that its the wet belt causing the engine starve of oil but it doesnt make sense how it would only knock on idle in neutral and not when im moving or revving the engine.

Also, ive taken the car to the dealership i bought it from and a ford garage and they have both told me its one of the quietest ecoboost engines they have heard 😂.

Earlier in the thread you said it stops if you select first gear and keep the clutch down.  I can't think of any fault that fits that description.

I'm not ruling out a wetbelt fault.  But from the info we have so far, I'm certainly not convinced that it's a belt issue.

Do you know anyone else with a 1.0EB you could compare to?

4 minutes ago, TomsFocus said:

Earlier in the thread you said it stops if you select first gear and keep the clutch down.  I can't think of any fault that fits that description.

I'm not ruling out a wetbelt fault.  But from the info we have so far, I'm certainly not convinced that it's a belt issue.

Do you know anyone else with a 1.0EB you could compare to?

Yeah my friends brother has one and to be honest from all the 1.0 ecoboosts ive heard each one of them have their own weird noise they make and are just noisy engines in general.

2 minutes ago, unsaltedshoes said:

Yeah my friends brother has one and to be honest from all the 1.0 ecoboosts ive heard each one of them have their own weird noise they make and are just noisy engines in general.

They get even noisier with the revised chain engines lol.

Yours is probably fine tbh.  Some of us are just more sensitive to noise than others.

34 minutes ago, TomsFocus said:

They get even noisier with the revised chain engines lol.

Yours is probably fine tbh.  Some of us are just more sensitive to noise than others.

Which year did the chain engines come out? Is it on the mild hybrid ones only?

1 hour ago, unsaltedshoes said:

Which year did the chain engines come out?

You don't need worry about a noisy rattling chain, your car has the super smooth quite wetbelt 🤣

10 hours ago, unofix said:

You don't need worry about a noisy rattling chain, your car has the super smooth quite wetbelt 🤣

Im never going near a wetbelt engine again too much to worry about 😂

12 hours ago, unsaltedshoes said:

Which year did the chain engines come out? Is it on the mild hybrid ones only?

On the Focus the chain engine came out with the Mk4 in 2018.

But on Fiesta the Mk8 came with both chain & wetbelt engines for a few years.  Only real way to confirm is to look under the bonnet.

All the MHEV's are chain.  But not all the chain engines are MHEV.

The chain engines still have a small wetbelt for the oil pump.  We are seeing that belt fail more and more often now.  The chain engine isn't likely to be any more reliable long term because of the oil pump belt.  Have to wonder who designed them that way, it would have been so easy to convert the oil pump to chain as well!

16 hours ago, unofix said:

You don't need worry about a noisy rattling chain, your car has the super smooth quite wetbelt 🤣

A little off topic but would you believe that twice recently, I've stopped the car, put it into neutral, set the hand brake, and then got out of the car without stopping the engine - because I couldn't hear it!

Each time I wondered why I couldn't lock the car. Thought the key fob battery had failed again 🤣