Knocking on/off power ponderings

[Robbie Corbett]

Hi All,

Finally have the Clio driving again, MOT this week. Took it up the road after having a mini nightmare with front wheel bearings (all good now) and I have a slightly odd knock in low gears coming on/off power (at low speed). I cannot induce it when stationary by lifting the clutch etc.

The car has new engine mounts with the powerflex top insert, new dog bone with powerflex bushes, new gearbox mounts etcetc. Basically its all new. Its raining and I've just about run out of light and will. Intend to go round and check I've torqued everything up tomorrow but does anyone have any ideas?

I can feel the clunk through the brake pedal (its not the ABS, much harder edged). Just fitted a Miltek system so wondering if it could be some part of the exhaust hitting the bulk head, or potentially engine mount. The fact that I can feel it through the pedals makes me think its not drive shaft related, joints are quiet while turning on lock etc.

Any wizards got an idea/had this before? Will give me a good idea on where to start the hunt.

Cheers all

Rob

 

[JamesBryan]

Check ball joint bolts to the wishbone are tight and also the subframe bolts.

 

[Robbie Corbett]

Cheers James, new wishbones so could well be them, sub-frame was not touched. I hate hunting for stuff like this!

 

[Louis]

I was going to say the same as james! Make sure you check sooner rather than later or you'll oval the holes.

 

[JamesBryan]

Maybe gearbox battery tray mount too.

Check every bolt if you have time.

 

[Robbie Corbett]

I was going to say the same as james! Make sure you check sooner rather than later or you'll oval the holes.

Are we talking subframe holes here?

 

[Robbie Corbett]

Maybe gearbox battery tray mount too.

Check every bolt if you have time.

Good shout, I suspect its going to come down to that. Engines been out etc. So it could be anything.

Arse.

One of my wishbones started the pull the bracket closed while I was torquing the bolt up, OEM parts but wondering if there is a spacer missing or a defective part, guess the lower arm could be moving forwards/backwards if thats the case. Just odd that I can feel such a thump through the pedals.

 

[Louis]

Are we talking subframe holes here?

Balljoint to wishbone holes

 

[RustyMojo]

When I first clicked on to this thread, I had misinterpreted it’s title and presumed it was an extension to the ‘fit chick over 40 thread’

 

[Robbie Corbett]

Balljoint to wishbone holes

Ball joint on the end of the wishbone? Cool - I'll double check, haven't actually touched them as them came attached from RPD.

 

[Krarl]

Aye I'd deffo be checking them then 😂

Just give everything a once over mate, sack the torque wrench off and give everything a good lean on with the spanner. So hard to diagnose a clunk without being in the car or driving it

 

[Louis]

Good shout, I suspect its going to come down to that. Engines been out etc. So it could be anything.

Arse.

One of my wishbones started the pull the bracket closed while I was torquing the bolt up, OEM parts but wondering if there is a spacer missing or a defective part, guess the lower arm could be moving forwards/backwards if thats the case. Just odd that I can feel such a thump through the pedals.

I dont think you need washers in oem wishbone bushes. You do on powerflex ones.

 

[Robbie Corbett]

Cheers all - Yea Kyle know what you mean. I chuffing hate 'Whats this noise' posts haha.

Just needed to have a moan about my clunk. Was so annoyed about wheel bearing issue that I haven't even looked in the direction of the s**t heap for a month, then realised that the MOT ran out last week so need to get on it.

 

[Robbie Corbett]

Just to close this... because I know you've probably all been awake at night worrying about me.

The left hand engine mount was finger tight... tightened up - clonk has gone.

Sleep well tonight boys

 

[jinjur]

Wish the drivetrain knocking/vibration in mine was that easy sorted :/

Don't even start on me about the hesitation

Either way, good work @Touring_Rob

 

[Martin_172]

Just to close this... because I know you've probably all been awake at night worrying about me.

The left hand engine mount was finger tight... tightened up - clonk has gone.

Sleep well tonight boys

I was literally just about to post saying loosen off the left hand engine mount, pull the engine forward and tighten again!!

 

[Robbie Corbett]

I was literally just about to post saying loosen off the left hand engine mount, pull the engine forward and tighten again!!

You would have won the top draw prize. Funny how it felt like the engine was hitting the bulkhead.... when the engine was basically hitting the bulkhead haha. Was a big relief when I finally got to engine mount bolts, they were the last ones I checked naturally 🤦‍♂️

 

[Krarl]

My engine mount in my first 172 was that bad that it had rubbed through the aircon pipes the engine had lifted itself that much 😂