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Model specific boards => Golf mk3 => Topic started by: drc12369 on 11 December 2012, 17:45

Title: Rattle or Misfire?
Post by: drc12369 on 11 December 2012, 17:45
So the anoying noise coming from my car somewhere near the front under hard acceleration, is it a rattle or a misfire? How do i spot a misfire?
Title: Re: Rattle or Misfire?
Post by: tweed on 11 December 2012, 17:57
Car has no power  :laugh:
Title: Re: Rattle or Misfire?
Post by: drc12369 on 11 December 2012, 19:53
Its my first gti and its a 8v so i have nothing to compare it to? Ive changed the plugs and ive got ht leads and a dissy cap to fit when i get a chance. It doesnt seem to wanna go past 85mph and does 3100revs at 70mph so ive no clue if its a misfire?
Title: Re: Rattle or Misfire?
Post by: tweed on 11 December 2012, 20:14
That is not good!!!

Your car should do 90mph in 3rd.

I suggest you change the leads and cap right away. Give the rotor arm a good scrub with a bit of sand paper or wire wool.
Title: Re: Rattle or Misfire?
Post by: drc12369 on 12 December 2012, 07:53
90mph!  in 3rd?! A 97 8v gti? Really?  If thats the case my cars proper f**ked lol leads and cap it is then. Watch this space. ..
Title: Re: Rattle or Misfire?
Post by: tweed on 12 December 2012, 11:09
Yes mine certainly does. Maybe get the rotor arm also.
Title: Re: Rattle or Misfire?
Post by: drc12369 on 12 December 2012, 11:22
Ill do the dissy cap n leads first. Wouldnt know what to do with a rotor arm, how to clean it, sand it etc let alone fit a new one. Hopefully what ive got will sort it. Hopefully ill get a chance saturday to do it
Title: Re: Rattle or Misfire?
Post by: Len on 12 December 2012, 13:02
Usually a rattle is there all the time, whereas a misfire maybe intermittent
Title: Re: Rattle or Misfire?
Post by: GOLF-MK3-GTI on 12 December 2012, 14:30
That is not good!!!

Your car should do 90mph in 3rd.

I suggest you change the leads and cap right away. Give the rotor arm a good scrub with a bit of sand paper or wire wool.

i agree with tweed, mine does 90mph in no time, and I've had mine at 135mph with ease.
Title: Re: Rattle or Misfire?
Post by: drc12369 on 12 December 2012, 14:47
so if thats the case why does everyone on here diss 8v's?
Title: Re: Rattle or Misfire?
Post by: thai-wronghorse on 12 December 2012, 14:53
That is not good!!!

Your car should do 90mph in 3rd.

I suggest you change the leads and cap right away. Give the rotor arm a good scrub with a bit of sand paper or wire wool.

i agree with tweed, mine does 90mph in no time, and I've had mine at 135mph with ease.

An accurately calibrated LIDAR speed gun would say otherwise. Vehicle odometers generally read over your actual speed.
Title: Re: Rattle or Misfire?
Post by: Len on 12 December 2012, 14:59
An 8v will do 125mph max!
Title: Re: Rattle or Misfire?
Post by: VR6_Wherry on 12 December 2012, 15:12
I had a well looked after 8v and the chance of getting to 90 in third would have been 0..
Title: Re: Rattle or Misfire?
Post by: GOLF-MK3-GTI on 12 December 2012, 15:23
An 8v will do 125mph max!

Possibly, But i've had mine at 135MPH, Very Scary...
Title: Re: Rattle or Misfire?
Post by: GOLF-MK3-GTI on 12 December 2012, 15:24
I had a well looked after 8v and the chance of getting to 90 in third would have been 0..

Maybe yours was not well looked after'd after all...  :grin:
Title: Re: Rattle or Misfire?
Post by: tweed on 12 December 2012, 16:17
I had a well looked after 8v and the chance of getting to 90 in third would have been 0..

Mines had 8 services in 25,000 miles and a cam. Do 100mph in 3rd if I removed the limiter and fitted a turbo   :grin:
Title: Re: Rattle or Misfire?
Post by: drc12369 on 12 December 2012, 16:42
Well since ive bought it in October mines had a full cambelt n tensioner kit change, oil m oil filter change, air filter change, new NGK BUR6ET plugs put in, all the fluids topped up, 2 tanks of Shell Vpower and a cleaning additive put through it, and once the new dissy cap and ht leads get put on thats me done. Thats the limit of my funds and knowledge. If it aint running right after this weekend im outta options  :cry:
Title: Re: Rattle or Misfire?
Post by: GOLF-MK3-GTI on 12 December 2012, 16:51
I'm pretty sure I read somewhere ages ago that thrashing the engine once in a while is good for the engine, as it helps clear out all the crabon being bulit up.

But before you start thrashing, make sure everything is running right And engine is at it's optimum level to be opend up :grin:

and i aint a boy racer who likes 1st & 2nd gears only. Its 3rd gear upwards for me  :laugh:

Title: Re: Rattle or Misfire?
Post by: VW BUSH on 12 December 2012, 18:24
I had a well looked after 8v and the chance of getting to 90 in third would have been 0..

Mines had 8 services in 25,000 miles and a cam. Do 100mph in 3rd if I removed the limiter and fitted a turbo   :grin:

Mines got 160k on it and does 90 in 3rd easy, speedo/nav confirmed..........
Title: Re: Rattle or Misfire?
Post by: benvictors on 12 December 2012, 19:13
so if thats the case why does everyone on here diss 8v's?

Because it takes about 2 days to get to that 90mph in 3rd  :grin: :grin: :grin:
Title: Re: Rattle or Misfire?
Post by: tweed on 12 December 2012, 19:27
so if thats the case why does everyone on here diss 8v's?

Because it takes about 2 days to get to
 that 90mph in 3rd  :grin: :grin: :grin:

 :grin: the speed isn't the problem, its the acceleration.   
Title: Re: Rattle or Misfire?
Post by: Len on 13 December 2012, 13:23
An 8v will do 125mph max!

Possibly, But i've had mine at 135MPH, Very Scary...

I dont believe it!
Title: Re: Rattle or Misfire?
Post by: thai-wronghorse on 13 December 2012, 14:34
Victor mildrew?
Title: Re: Rattle or Misfire?
Post by: tweed on 13 December 2012, 16:02
An 8v will do 125mph max!

Possibly, But i've had mine at 135MPH, Very Scary...

I dont believe it!

I've had my clocks at that too  :wink:
Title: Re: Rattle or Misfire?
Post by: GOLF-MK3-GTI on 13 December 2012, 16:38
An 8v will do 125mph max!

Possibly, But i've had mine at 135MPH, Very Scary...

I dont believe it!

Trust me, I've done it...
Title: Re: Rattle or Misfire?
Post by: GOLF-MK3-GTI on 13 December 2012, 16:44
An 8v will do 125mph max!

Possibly, But i've had mine at 135MPH, Very Scary...

I dont believe it!

I've had my clocks at that too  :wink:

It sounds like, its only me & Tweed, who have really pushed an 8V GTI to its limit...  :laugh:
Title: Re: Rattle or Misfire?
Post by: Len on 14 December 2012, 08:57
Well I think that your 8v clocks are reading very, very optimisticly!
Title: Re: Rattle or Misfire?
Post by: VW BUSH on 14 December 2012, 10:27
At top speed the Mk3 is quite stable not scary at all, a Mk2 at 135mph borderline brown trousers :grin:
The windscreen used to vibrate into a fuzz from 125 to 130 then go clear.....
I was quite foolish as a young lad :lipsrsealed:
Title: Re: Rattle or Misfire?
Post by: drc12369 on 14 December 2012, 10:51
So back to my point, if it is a misfire and the new plugs leads and dissy cap dont fix it, except for a new rotor arm what do i do next?
Title: Re: Rattle or Misfire?
Post by: Len on 14 December 2012, 13:35
Get a code reader on it!
Title: Re: Rattle or Misfire?
Post by: drc12369 on 23 December 2012, 13:12
So yeah, new ht leads n dissy cap fitted along with the new plugs. Rotor arm sanded down too but nope! Still a rattle under load/acceleration? Ideas lads?
Title: Re: Rattle or Misfire?
Post by: tweed on 23 December 2012, 13:16
You need to tell us if its a rattle or misfire.

We can only help/advise what to do from what you tell us. You need to go out in your car. Take a friend and try to identify what the problem is.

Rattle or misfire is like chalk and cheese. 
Title: Re: Rattle or Misfire?
Post by: drc12369 on 23 December 2012, 14:28
I dont have enough knowledge to know what it is. If i did i wouldnt be here  :laugh:
Title: Re: Rattle or Misfire?
Post by: tweed on 23 December 2012, 14:57
I dont have enough knowledge to know what it is. If i did i wouldnt be here  :laugh:

I know what's wrong with my car but I still don't know what the source is.

Get a mate or member of family and ask them what they think it is.
Title: Re: Rattle or Misfire?
Post by: trog_nfs on 23 December 2012, 15:08
MAF sensor.
Unplug it and see if it runs any better.

Noise might just be the sound of a cracked exhaust manifold leaking
Title: Re: Rattle or Misfire?
Post by: arran.concept on 23 December 2012, 15:56
Have to agree 90 in third and had my 8v way off the clocks
Title: Re: Rattle or Misfire?
Post by: drc12369 on 23 December 2012, 15:58
Ive had exhaust checked apparently its fine. What n wheres the maf sensor?
Title: Re: Rattle or Misfire?
Post by: arran.concept on 23 December 2012, 16:59
(http://i1150.photobucket.com/albums/o610/arranconcept/C8EA935C-E229-4548-8645-9E96DFBDBBB0-242-0000001285DA0AD6.jpg)
Title: Re: Rattle or Misfire?
Post by: drc12369 on 23 December 2012, 17:35
Nice pic. Which ones a maf sensor?
Title: Re: Rattle or Misfire?
Post by: tweed on 23 December 2012, 17:39
Nice pic. Which ones a maf sensor?

Air mass meter
Title: Re: Rattle or Misfire?
Post by: drc12369 on 26 December 2012, 08:54
So unplug the maf sensor and car will run fine? Hmmm so if it works do i even replace it? They sem to be £70 odd and with fitting that £100 easy. Hmmmmmm
Title: Re: Rattle or Misfire?
Post by: tweed on 26 December 2012, 11:52
If it works fine when its unplugged then replace it. Try a second hand item and do it yourself. Only two screws.
Title: Re: Rattle or Misfire?
Post by: drc12369 on 26 December 2012, 12:07
Had a wiggle at it this morning, how do i remove it exactly?
Title: Re: Rattle or Misfire?
Post by: drc12369 on 27 December 2012, 12:11
Ok disconnected sensor. Did a few miles. Same rattle. Same performance?! Next idea?!
Title: Re: Rattle or Misfire?
Post by: tweed on 27 December 2012, 13:23
How many miles it done?

Does it rev past 5000rpm? Or does it hit a rev limit at 5000rpm?
Title: Re: Rattle or Misfire?
Post by: drc12369 on 27 December 2012, 15:27
Its done 148k not sure about the revs? I think it goes past 5k tho not drivin for 3 days now tho
Title: Re: Rattle or Misfire?
Post by: vwwvgolf on 27 December 2012, 15:35
check heat shield right at the back and down in middle , covering the exhaust.
Title: Re: Rattle or Misfire?
Post by: tweed on 27 December 2012, 15:52
Start it up let it warm then put your foot flat on the throttle untill it hits the limiter
Title: Re: Rattle or Misfire?
Post by: geeksteve on 27 December 2012, 15:53
check heat shield right at the back and down in middle , covering the exhaust.

If that is it, you can put a few jubilee clips together round it and tighten it a bit, that stopped mine.

S
Title: Re: Rattle or Misfire?
Post by: drc12369 on 27 December 2012, 15:53
Heat shields were first tings i checked. All solid :wink:
Title: Re: Rattle or Misfire?
Post by: drc12369 on 29 December 2012, 08:54
So if it does stop at 5000rpm what the problem? (havent tried yet)
Title: Re: Rattle or Misfire?
Post by: thai-wronghorse on 29 December 2012, 10:07
If the engine won't pass 5k revs it would generally point to a timing issue and mean that the ECU has gone into 'safe mode'
Title: Re: Rattle or Misfire?
Post by: tweed on 29 December 2012, 11:55
And haven't you replaced the timing belt recently?
Title: Re: Rattle or Misfire?
Post by: drc12369 on 29 December 2012, 13:26
The timing belt was replaced recently but the car was like this before..
Title: Re: Rattle or Misfire?
Post by: drc12369 on 31 December 2012, 14:51
Just tried it. Stuck it in neutral and reved to 7000 no probs so not timing or safety mode! Still rattling/misfiring under acceleration. Its also cut out at idle in traffic once or twice now too? Really frustrating me  :angry:
Title: Re: Rattle or Misfire?
Post by: tweed on 31 December 2012, 18:32
I'm starting to run out of ideas mate.

Only thing I will suggest now is fuel pump relay
Title: Re: Rattle or Misfire?
Post by: drc12369 on 01 January 2013, 21:49
Thinking its just a rattle now, took the car out on a nice long rong today 120 miles   :tongue:had a few chances to smack it around a bit and easily did 80mph in 3rd 3-4 times, so im guessing its not misfiring :grin:
Title: Re: Rattle or Misfire?
Post by: tweed on 01 January 2013, 22:27
What a cock!
Title: Re: Rattle or Misfire?
Post by: Screech16v on 01 January 2013, 22:49
 :grin: :grin: :grin: