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Engine "clicking" while accelerating

MarioZg

Enthusiast
Messages
21
Location
Zagreb, Croatia
#1
One more thread, I hope this would be the last one in the problems section :D
Anyway, one day I was driving and everything was ok, but the other day, engine started "clicking" in acceleration. When it`s on idle it runs normally, driving in constant speed is normal, but while I`m pressing gas pedal in order to speed up, I hear that "clicking" sound.
Valves are set, distributor is brand new Ducellier, timing is set (but sound can be heard either on advanced or retarded timing), sparks and cables are new. I really don`t know where and how to look, because it can be heard only while accelerating, not even on higher rpm in neutral.
You may hear in video what I`m talking about, but the sound on video is not showing the quite actual sound which can be heard in car.


If anybody has any ideas, feel free to write. Thank you very much.
 

AdamWilkes

Enthusiast
Messages
164
Location
Poole
#2
Does it click if you remain parked & try to pull away - loading up only the engine? Just possible drive train clicking, not engine clicking.
 

MarioZg

Enthusiast
Messages
21
Location
Zagreb, Croatia
#3
Hi Adam! No, I hear it only when speeding up in 2nd 3rd and 4th gear but in 3rd and 4th sound is more likely to hear when the torque is lower. It happens always every time I press the throttle pedal. I suspected on distribution chain but I can`t be sure.
 

AdamWilkes

Enthusiast
Messages
164
Location
Poole
#4
Hi Mario, check for free play in the timing chain by trying to rotate the camshaft pulley (or the alternator pulley) by hand, firmly - if there is movement in the camshaft but no movement in the crankshaft (flywheel), then there is slack in the timing chain. I had this slackness and found that the tensioner has seized - lack of oil changes.
 

MarioZg

Enthusiast
Messages
21
Location
Zagreb, Croatia
#5
Sorry for taking me so long to answer, but I was really busy these days. Anyway, I recorded possible free play, but I'm not sure is it normal or can it really affect on clicking.
Please, take a look on this video. Thank you very much!
 

malcolm

& Clementine the Cat
Staff member
Messages
4,059
Location
Bedford UK
#6
Does the ticking get louder with higher load (driving up hill)? If so an exhaust manifold or downpipe leak can sound like ticking.
 

MarioZg

Enthusiast
Messages
21
Location
Zagreb, Croatia
#7
No, the sound is constant, ticking is rhythmically. Manifold seal is new, sound has appeared after week or two after changing seal out of nowhere- everything was ok in the morning, I went back from work and it started. I thought the same thing, tightened manifold screws, but the sound was still there. For example: I`m driving in constant speed in 4th gear about 60 km/h (without sound) and I press throttle till the end and I hear it in the same intensity an rhythm until I reach about 90km/h, then it get lost. When I`m in 3rd, it can be heard in between 50-75-80 km/h. I don`t hear it in neutral, no matter how hard or long I press the throttle, only and exclusively when engine is under load.
It`s hard to be a mechanic via internet, isn`t it :D
 

malcolm

& Clementine the Cat
Staff member
Messages
4,059
Location
Bedford UK
#8
A timing chain would be unlikely to strech overnight. I would be looking elsewhere. I would consider getting a friend to stick a rag over the end of the exhaust while you listen to the engine. It would rule out exhaust leaks or maybe a loose spark plug.
 

MarioZg

Enthusiast
Messages
21
Location
Zagreb, Croatia
#9
Yes, I agree... timing chain would show some problems over time, not out of nowhere. Yesterday I changed sparks but no difference. I really don`t know where to look anymore. I`ll try ti stick a rag and listen, thank you for advice, but I think that this sound comes from the engine itself. Ok, valves are set, but is there any possibility that sound comes from valves? I don`t think that because unset valves I would hear in every rpm, but... I really don`t know.
 

mojobaby

Enthusiast
Messages
1,127
#10
Hi Mario, might be the drive shaft starting to go bad. on my car it was worse when the engine was under load, like going up a really steep hill. Never heard it when cruising on a flat road.
When accelerating there is more torque applied to the wheels and thats when I heard it
 

MarioZg

Enthusiast
Messages
21
Location
Zagreb, Croatia
#11
I think I found problem. From what I saw on internet and from experience from some mechanics problem should be in broken manifold of manifold gasket is leaking. Did anybody ever heard of broken manifold on Renault 4, because I didn't.
But on the other side, I changed the gasket 2 months ago (Victor Reinz), so I don't understand why it would leak that soon.
 
Messages
164
Location
Poole
#13
I had my manifold skimmed because of bad distortion - unsure why, but exhaust and inlet branches weren't level with each other at the cylinder head, so unevenly clamping down.

I currently have a chronic manifold to first pipe leak, which - despite a new pipe and four different re-assemblies (with two different pastes) - is determined to leak after a couple of months. I re-seal it for the MOT and give up in-between times now!
 
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