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Old 11-11-2016   #1
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100HP rear knocking/pop

Hi
The 100Hp has developed a knock/pop from the off side rear. Having read threads on here i changed the rear shocks yesterday and added some bump stops, but it still remains. Sounds like a tool moving around in a plastic toolbox( no, the boot is empty ).
Seats are locked in place, seatbelt buckle not touching anything. Knocks on rough roads and little holes etc, but speed bumps dropped kerbs no knock.

Any advice appreciated, thanks.
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Old 12-11-2016   #2
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Re: 100HP rear knocking/pop

Are the wheels bolted on properly?

Have you left anything inside a spring pan?

Are both shocks properly bolted up?

What else have you spannered while under the car?
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Old 12-11-2016   #3
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Re: 100HP rear knocking/pop

Check you have not lost part of a rear coil spring, and also the spring supports are sound too. Those B bump stops allow only about 2cm of rear spring travel. No more nails between bump stop and body might do the trick. This knocking seems to be a weakness ofr the 100HP.. I am just about to fit some bump stops from a series 1 Brava to mine to soften it up bit. These are a little shorter and made of rubber not plastic.
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Old 13-11-2016   #4
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Re: 100HP rear knocking/pop

Quote Originally Posted by DaveMcT View Post
Are the wheels bolted on properly?

Have you left anything inside a spring pan?

Are both shocks properly bolted up?

What else have you spannered while under the car?
It is the same knock as i had before changing the shocks. no work work done on the car since september, knock started maybe 2 weeks ago. Everything is bolted on correctly.

Quote Originally Posted by petercresswell View Post
Check you have not lost part of a rear coil spring, and also the spring supports are sound too. Those B bump stops allow only about 2cm of rear spring travel. No more nails between bump stop and body might do the trick. This knocking seems to be a weakness ofr the 100HP.. I am just about to fit some bump stops from a series 1 Brava to mine to soften it up bit. These are a little shorter and made of rubber not plastic.
The car never had bumpstops when i got. I fitted the ones from shop4parts, listed as 500/panda bump stops. Springs looked fine, no missing bits the rubber at the top was fine. Springs seated in same position as before removal.
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Old 13-11-2016   #5
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Re: 100HP rear knocking/pop

If it's been run for some time with no bump stops the shock could be damaged.

The broken spring theory is also possible.

Jack up the car (trolley jack under centre of rear beam). Support the body on axle stands. Remove wheels and remove both rear shocks.

Remove and replace the shock bottom bolts first or you risk cross-threading the top bolts.
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Old 14-11-2016   #6
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Re: 100HP rear knocking/pop

I have already changed shocks and added bump stops, as stated in OP. The knocking still remains.
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Old 14-11-2016   #7
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Re: 100HP rear knocking/pop

My 1.2 has some tailgate rattles which I have been fixing when I get the time/motivation.
So far:
Half a self-tapping screw from dealer fitted number plate. Was rattling on uneven roads. Quite loud at times.
Tailgate strut ball and socket loose. Made a clunk when hitting potholes.
Low level rattle from hinges. Haven't sorted yet, as it looks like one of the hinges is worn.
Any or all of these could sound like a suspension related noise, so worth eliminating. Lift the tailgate and oscilate it a few inches up and down.
If it clunks, hold each of the struts in turn and repeat. You can "feel" the noise if they have a problem.
If neither strut clunks, probably worn hinge.
If it is something like the rusted off screw, you will hear it roll about when you lift the tailgate.
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Old 14-11-2016   #8
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Re: 100HP rear knocking/pop

To test the tail gate for rattles, throw a rug over the door sill and hold the door closed with a bungee cord over the wiper shaft to hold the door down.
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Old 14-11-2016   #9
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Re: 100HP rear knocking/pop

Quote Originally Posted by irc View Post
My 1.2 has some tailgate rattles which I have been fixing when I get the time/motivation.
So far:
Half a self-tapping screw from dealer fitted number plate. Was rattling on uneven roads. Quite loud at times.
Tailgate strut ball and socket loose. Made a clunk when hitting potholes.
Low level rattle from hinges. Haven't sorted yet, as it looks like one of the hinges is worn.
Any or all of these could sound like a suspension related noise, so worth eliminating. Lift the tailgate and oscilate it a few inches up and down.
If it clunks, hold each of the struts in turn and repeat. You can "feel" the noise if they have a problem.
If neither strut clunks, probably worn hinge.
If it is something like the rusted off screw, you will hear it roll about when you lift the tailgate.
Thanks will have a look tomorrow. The window repair guy was quite aggressive last year when he was shaking glass out of inside of tailgate. He soon stopped when i clocked him. The more i hear it the more i am convinced its coming from inside the car.
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Old 15-11-2016   #10
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Re: 100HP rear knocking/pop

Has something got loose under the back seat cushion? Had a busted spring on a Clio a while back it sounded like a spanner rattling under the back seat but was in fact the o/s/f spring. It took a second person (me)moving around inside the car while someone else drove before we finally pinpointed the location. Could it be something loose inside a rear light unit?
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Old 15-11-2016   #11
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Re: 100HP rear knocking/pop

I think iv found the problem after reading other threads. The rubber stopper on tailgate. The drivers side one wasn't out as much as the other. They both look like they have had better days. I have adjusted both to there limit. Still get the very occasional knock but no where near as bad. Will order some new ones and see.
I did check the struts, no clunk when opening and closing.
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Old 11-04-2019   #12
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Re: 100HP rear knocking/pop

Hi I too have a knock at the rear behind the driver side
Changed springs
New shock absorbers
Swaped wheels over
Drove with tailgate open
Removed rear seats and spare wheel

The knock is at 20mph on bumpy side roads
Main roads itís fine

Had garage to check rear axel bushes and they donít think itís that
If I had to name anything ide say itís coming from around the fuel tank area

Can anyone shed any light on this please
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Old 11-04-2019   #13
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Re: 100HP rear knocking/pop

my girlfriend's 100hp has a knock on the nearside rear when driving off my drop curb. The rest of the time you can't hear anything.

No idea what it is. Checked the usual and mentioned it at the MOT. Can't find anything obvious.
Sounds like a spring moving to me.

Had a rattle before that was the boot struts. Put some foam pipe insulation round them and that stopped it
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Old 11-04-2019   #14
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Re: 100HP rear knocking/pop

Check the hand brake cable clips under the rear axle. They widen over time allowing the cable to move about. I flipped the brake cables out, wrapped some self amalgamating tape around the bracket areas and refitted them with cable ties to prevent excessive movement.

You will need to disconnect the cables at the brake caliper lever arm.

Also check the stub axle studs are fastened up properly. All should be fine but always worth a look.
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Old 11-04-2019   #15
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Re: 100HP rear knocking/pop

take the spare wheel and tools out and test again
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