8th Gen ctdi exhaust rasp - Civinfo

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post #1 of 17 (permalink) Old 19th March 2017, 03:09 Thread Starter
 
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8th Gen ctdi exhaust rasp

Hi new owner & member, I have an 8th Gen 2.2 ctdi Civic with terrible annoying exhaust rasp on engine overun (slowing down/changing gear)

I suspect that the baffles have rotted away inside the rear box as there is no blowing leaks. Anybody had a similar issue please????
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post #2 of 17 (permalink) Old 19th March 2017, 03:11 Thread Starter
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PS there is a thin metal heat shield above the rear box that is hanging off too - do people just remove these?? I'm not sure exactly what the heatshield is protecting - hopefully not the fuel tank.......
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post #3 of 17 (permalink) Old 19th March 2017, 09:23
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I didn't have any issues when I ran the standard exhaust but I did have the heat shield drop down. I used some big washers at first before removing the whole thing when the car was up on a lift and I could see the exhaust wasn't near anything of concern, I'm running a Martellius exhaust though with a tiny back box.
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post #4 of 17 (permalink) Old 19th March 2017, 09:55
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The heatshields, especially that one above the backbox just rot and can be repaired with big washers as above.

I'm not a fan of removing them but that rear one only looks like it only protects the boot, fuel tank is up front in the R but I'm sure it's the same throughout the MK8 range.
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post #5 of 17 (permalink) Old 19th March 2017, 11:07
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Nope, i ran a stock zoorst and it never made a rasp.

You could well have a blown baffle, tap the mufflers to check.

Good luck.
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post #6 of 17 (permalink) Old 19th March 2017, 15:14
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for the rear heat shield you need a pack of these

AVF M6 Steel Repair Washer, Pack of 10 | Departments | DIY at B&Q

the 2 most rear fixings could do with using 2 washers to sandwich the heat shield between them, i used slightly longer bolts to accommodate the washers the original bolts are quite short

works for me

EDIT..

dunno if anybody else is getting the same but every time i try to post the link i'm getting some double click.net thing added to it making the link useless

what your looking for is these

AVF M6 STEEL REPAIR WASHER, PACK OF 10

just search those in B & Q website
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Last edited by cosmicma; 19th March 2017 at 15:23.
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post #7 of 17 (permalink) Old 19th March 2017, 18:54 Thread Starter
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So, I've binned the shield and it is still farting like a goodun on gear changes & overun. The back box actually looks pretty new so I'm beginning to worry of it's the front muffler on the intermediate pipe that's gone. My worry is a garage says it's a certain part then it's not and i"m £120 down & still have the problem.

A one of these national chains that specialise in tyres & exhausts will just say it needs a full system as they're rip off merchants. Not sure what to do...
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post #8 of 17 (permalink) Old 19th March 2017, 19:09
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is it just a little rasp then normal or is it there all the time when you shut off
if its just a little you could look at the air filter most aftermarket ones don't fit correctly and when I had 1 fitted it gave a little rasp when changing gear but was soon cured by fitting genuine part
it does sound like a exhaust rasp when its doing it
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post #9 of 17 (permalink) Old 19th March 2017, 19:13
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Quote:
Originally Posted by BB-8Fan View Post
PS there is a thin metal heat shield above the rear box that is hanging off too - do people just remove these?? I'm not sure exactly what the heatshield is protecting - hopefully not the fuel tank.......
the fuel tank is under the front seats
as already said remove bolts put big washers on and replace bolts job sorted
or remove if you wish
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post #10 of 17 (permalink) Old 19th March 2017, 22:55 Thread Starter
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Quote:
Originally Posted by scaramanga View Post
is it just a little rasp then normal or is it there all the time when you shut off
if its just a little you could look at the air filter most aftermarket ones don't fit correctly and when I had 1 fitted it gave a little rasp when changing gear but was soon cured by fitting genuine part
it does sound like a exhaust rasp when its doing it
Afraid it is defo something wrong, I test drove another one a week ago and not a peep from the exhaust on overun... And definitely the exhaust mid or rear section causing it...
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post #11 of 17 (permalink) Old 19th March 2017, 23:39
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well go to somewhere that will get it on a lift and allow you to go underneath and listen to it your self
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post #12 of 17 (permalink) Old 19th March 2017, 23:42
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If you don't want to pay off an OEM replacement, then pop into an exhaust specialist for an appraisal.

They might be able to sort you out for just a few quid, maybe.
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post #13 of 17 (permalink) Old 20th March 2017, 01:51 Thread Starter
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Ugh, I wish - going to visit a few tomorrow & get it test driven - will see what a few diagnose then take it from there.

Hard to check the mid pipe as it's tucked away under that big tray - pity.
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post #14 of 17 (permalink) Old 20th March 2017, 21:35
more torque than the mrs
 
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what mileage you on? not heard many people having to change their oem exhaust on the dervs even at 150k,the only issues I know are cracked manifolds maybe a large crack is present in yours and this what you can hear, can you smell diesel fumes inside the car.. good luck and let us know.
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post #15 of 17 (permalink) Old 21st March 2017, 16:13 Thread Starter
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Right, update: Took it to the garage and it'd not the exhaust - it is induction noise from the air filter area.

I've seen a few with the same problem online so i removed the air box and air resonator to check for cracks etc. Some flyboys remove the resonator so it sounds 'Sporty' (rolls eyes) but it was all still there ok. I wrapped the plastic tube in foam & refitted it in case it was vibrating against the inner wing & it made it go away but it came back as soon as the engine got hot.

I have just ordered a genuine Honda air filter just in case the cheap aftermarket one fitted isnt getting a good air tight seal on the air box.

I will keep you posted.
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post #16 of 17 (permalink) Old 24th March 2017, 16:35 Thread Starter
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Ok, all fixed now. It was the aftermarket air filter causing the exhaust blowing type of sound. Fitted a genuine honda one and its perfect.
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post #17 of 17 (permalink) Old 24th March 2017, 17:19
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Much less hassle using OEM filters, they aren't expensive.
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