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Model specific boards => Golf mk4 => Topic started by: UnCl3RoRy on 20 June 2014, 18:45

Title: Metallic rattle after Remap
Post by: UnCl3RoRy on 20 June 2014, 18:45

I had a remap done the other day, and when you give it some wellie, it reaches about 4/5000 rpm and there is a tinny metallic rattle coming from the back of the engine. (towards the cab)

any ideas what it could be? I never noticed it before it was remapped.

The noise does not effect the performance.

any thoughts would be greatly appreciated, thanks.

Title: Re: Metallic rattle after Remap
Post by: Nino on 20 June 2014, 20:32

Sounds like the propeller on the turbo  :lipsrsealed:

Title: Re: Metallic rattle after Remap
Post by: rio_gti on 20 June 2014, 22:08

Put a vid of it up?

Could it be hear shield?

Title: Re: Metallic rattle after Remap
Post by: viperjsy on 20 June 2014, 22:16

I think it would be the heat shield

Title: Re: Metallic rattle after Remap
Post by: UnCl3RoRy on 20 June 2014, 22:29

Like i said, it doesn't effect the performance, so if a propeller was broken , I would notice problems with performance, and I would of surely noticed it before anyway?  And I would notice when the turbo first spools correct? At first spool it's absolutely fine.


I have tried a video but it wasn't very clear so I will try again tomorrow.

Title: Re: Metallic rattle after Remap
Post by: Wayne on 21 June 2014, 10:06

It might be pinking which could be serious if left.

Title: Re: Metallic rattle after Remap
Post by: Kruga on 21 June 2014, 15:40

I can almost guarantee its your heat shield exact same thing started happening to mine once i had it remapped took the heat shield off and no longer any rattling

Title: Re: Metallic rattle after Remap
Post by: UnCl3RoRy on 21 June 2014, 17:10

Ive had a play with the heatshield today, found one of the rings what holds the shield one was really loose, so ive tried my best to make it hold a bit better,

out of curiosity, what is pinking, how is it checked? ive had the water pump and timing belt done only a couple of thousand miles ago.

thanks for the advice

Title: Re: Metallic rattle after Remap
Post by: Wazzzer on 21 June 2014, 20:16

pinking is pre detonation, ie your mix is too hot/lean with not enough fuel. The mixture ignites before the spark as the cylinder temperatures are sky high leading to all sorts of problems and can result in a nice bit of piston soup if it's really bad

Title: Re: Metallic rattle after Remap
Post by: UnCl3RoRy on 22 June 2014, 15:53

I think it was the heatshield, managed to secure it back into position,

if it continues i think i will just remove it.

thanks for all the help

Title: Re: Metallic rattle after Remap
Post by: Kruga on 22 June 2014, 18:59

told ya

Title: Re: Metallic rattle after Remap
Post by: UnCl3RoRy on 23 June 2014, 17:17

does it come off in sections?

Title: Re: Metallic rattle after Remap
Post by: leigh_harty on 23 June 2014, 18:05

I'd leave it on, or if you insist on ripping it out then make a heat shield out of something else decent.

Your turbo can get hot enough to glow (and if you remapped your car you're obviously going to give it some now and again... or always  :cool:)

But its their for a reason and protects all kinds of things from the heat! You know how close your downpipe is to your steering rack etc