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Author Subject: Gti6, where do i start
ssmith61

Newbie

Location: eastbourne

Registered: 10 Jan 2010

Posts: 37

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Post #1
Hi all,

I bought a gti6 a few days ago and i have a handfull of problems already.

The car takes ages to start. It turns over but doesnt fire for ages, it give off the odd pop when turning over and sometimes it starts but is runing 100rpm the stalls. When it does eventually start it drives like a 80bhp car, it will not hit 100mph unless you have a massive straight. My bmw 318 is alot faster. It just makes loads of induction noise and doesnt do anything. Now and again usually when i have been stuck in traffic and then pull away it pulls great but only for about a second then its back to normall. I idles great and doesnt missfire.

I have replaced all the plugs and replaced the air filter but has made no difference.

I dont know where to go from here i am seriously considering selling it for spares.

If anyone could help it would be much appreciated

cheers
Posted 10th Jan 2010 at 23:43
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kezman7

Senior User

Location: Castleford

Registered: 20 Feb 2009

Posts: 762

Status: Offline
Post #2
Changed oils ect? Sounds like its been abused abit in the past.
Posted 10th Jan 2010 at 23:45
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ssmith61

Newbie

Location: eastbourne

Registered: 10 Jan 2010

Posts: 37

Status: Offline
Post #3
Yes changed oil and filter. But even that wouldnt explain a roughly 70bhp power loss. I just dont know where to start. If i start replacing sensors and the coil packs im just wasting money if its not that. My first thought was a dodgy coil but it idles fine and is defo not running on 3. Now and again about 6k rpm it takes off for a split second like a big surge of power.

I agree this car has seen some action but its in showroom condition shame it doesnt run right. But for
Posted 10th Jan 2010 at 23:57
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allesclar

Seasoned Pro

Location: Sheffield

Registered: 17 May 2009

Posts: 4,254

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Post #4
send it back to where you got it, sounds like a shitter.

It could be the coil packs, have you thought about getting it looked at in a garage just for suggestions?

I personally would get a service straight away, and ask them to have a quick look at it Smile

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Posted 10th Jan 2010 at 23:58
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ssmith61

Newbie

Location: eastbourne

Registered: 10 Jan 2010

Posts: 37

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Post #5
Its not a shitter its probebly cleaner than the majority of gti's it just runs like shit lol

Its strange cause i no its going to be something staright forward as its not low on compression (i have done a comp test) there is no knocking, just had a cambelt and waterpump (also checked the timing its bang on) and not the hg

It has to be a sensor or coil surely. But its going to be an shitter to find out which one.
Posted 11th Jan 2010 at 00:26
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welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

Posts: 25,839

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Post #6
how was it before the timing belt was changed?

was the cams and bottom end pinned before the old belt removed?

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Posted 11th Jan 2010 at 00:28
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ssmith61

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Location: eastbourne

Registered: 10 Jan 2010

Posts: 37

Status: Offline
Post #7
welshpug! wrote:
how was it before the timing belt was changed?

was the cams and bottom end pinned before the old belt removed?


The cambelt was done before i got it. I have searched alot and is leading me to think the map sensor is at fault.
Posted 11th Jan 2010 at 00:33
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mechanical_repairs

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Location: leicester

Registered: 10 Jan 2005

Posts: 12,122

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Post #8
Sounds to me from your description that it could be down on compression and this is the trouble getting it started and being slow.

|Get a compression check down and see what you have, post up the results on here, you should have 180-200 psi on each cylinder.

Carl

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Posted 11th Jan 2010 at 00:52
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jeffers Forum Admin

Location: Leeds

Registered: 14 Dec 2003

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Post #9
I am no expert by any means but if it runs okay but low on power, and is hard to start, possibly th timing is out??Unsure

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Posted 11th Jan 2010 at 01:03
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adam b

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Location: The Nam

Registered: 24 Jan 2006

Posts: 12,828

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Post #10
mechanical_repairs wrote:
Sounds to me from your description that it could be down on compression and this is the trouble getting it started and being slow.

|Get a compression check down and see what you have, post up the results on here, you should have 180-200 psi on each cylinder.

Carl


But he's done a comp test...?!
Try unplugging various sensors to see if they make a difference. Could be the cam or crank sensor too.

Change the fuel and air filters as well.

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Nothing to see here
Posted 11th Jan 2010 at 01:03
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adam b

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Registered: 24 Jan 2006

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Post #11
jeffers wrote:
I am no expert by any means but if it runs okay but low on power, and is hard to start, possibly th timing is out??Unsure


It would probably be dead if the timing was out. Smile

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Posted 11th Jan 2010 at 01:04
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sport1901966

Senior User

Location: Hertfordshire/Epsom

Registered: 17 Aug 2006

Posts: 687

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Post #12
All seem like symptoms of a really poor mixture to me, maybe hooking up to diagnostics kit will point out any dodgy sensors. When you start it try unpluging the coolant temperature sensor (blue plug on the thermostat I believe) as dodgy signals from this to the ecu can cause a bad mixture and would make starting very difficult.

Mixture problems would explain the popping and poor running to. Thats where I'd have my money.
Posted 11th Jan 2010 at 01:06
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ssmith61

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Location: eastbourne

Registered: 10 Jan 2010

Posts: 37

Status: Offline
Post #13
mechanical_repairs wrote:
Sounds to me from your description that it could be down on compression and this is the trouble getting it started and being slow.

|Get a compression check down and see what you have, post up the results on here, you should have 180-200 psi on each cylinder.

Carl


I will post up the results tommoro mate.
Posted 11th Jan 2010 at 01:20
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ssmith61

Newbie

Location: eastbourne

Registered: 10 Jan 2010

Posts: 37

Status: Offline
Post #14
adam b wrote:
mechanical_repairs wrote:
Sounds to me from your description that it could be down on compression and this is the trouble getting it started and being slow.

|Get a compression check down and see what you have, post up the results on here, you should have 180-200 psi on each cylinder.

Carl


But he's done a comp test...?!
Try unplugging various sensors to see if they make a difference. Could be the cam or crank sensor too.

Change the fuel and air filters as well.


Yeah i have done one mate i have them written down at the garage i will post up results tommorow. I will give the sensors a go tommorow, i have done the air filter. Where is the fuel filter located? cheers for the help everyone
Posted 11th Jan 2010 at 01:24
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ssmith61

Newbie

Location: eastbourne

Registered: 10 Jan 2010

Posts: 37

Status: Offline
Post #15
sport1901966 wrote:
All seem like symptoms of a really poor mixture to me, maybe hooking up to diagnostics kit will point out any dodgy sensors. When you start it try unpluging the coolant temperature sensor (blue plug on the thermostat I believe) as dodgy signals from this to the ecu can cause a bad mixture and would make starting very difficult.

Mixture problems would explain the popping and poor running to. Thats where I'd have my money.


I will give that a go aswell. Something thats just came to mind it could be a leaking inlet mani gasket. Cheers
Posted 11th Jan 2010 at 01:25
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sport1901966

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Location: Hertfordshire/Epsom

Registered: 17 Aug 2006

Posts: 687

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Post #16
Fuel filter is under the car on the offside about half way between the wheels. I doubt it'll be a filter issue to be honest but stranger things have happened!
Posted 11th Jan 2010 at 01:26
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sport1901966

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Location: Hertfordshire/Epsom

Registered: 17 Aug 2006

Posts: 687

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Post #17
ssmith61 wrote:
sport1901966 wrote:
All seem like symptoms of a really poor mixture to me, maybe hooking up to diagnostics kit will point out any dodgy sensors. When you start it try unpluging the coolant temperature sensor (blue plug on the thermostat I believe) as dodgy signals from this to the ecu can cause a bad mixture and would make starting very difficult.

Mixture problems would explain the popping and poor running to. Thats where I'd have my money.


I will give that a go aswell. Something thats just came to mind it could be a leaking inlet mani gasket. Cheers


Has it been disturbed at some point then? The running sounds more like a rich mixture problem than lean but it certainly is possible.
Posted 11th Jan 2010 at 01:28
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darkgti6

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Location: Bracknell

Registered: 07 Jun 2008

Posts: 1,361

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Post #18
ssmith61 wrote:
sport1901966 wrote:
All seem like symptoms of a really poor mixture to me, maybe hooking up to diagnostics kit will point out any dodgy sensors. When you start it try unpluging the coolant temperature sensor (blue plug on the thermostat I believe) as dodgy signals from this to the ecu can cause a bad mixture and would make starting very difficult.

Mixture problems would explain the popping and poor running to. Thats where I'd have my money.


I will give that a go aswell. Something thats just came to mind it could be a leaking inlet mani gasket. Cheers


I doubt its the inlet manifold gasket. Mine had a major leak at the injector seals recently and didnt loose any power!

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Posted 11th Jan 2010 at 01:31
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ssmith61

Newbie

Location: eastbourne

Registered: 10 Jan 2010

Posts: 37

Status: Offline
Post #19
sport1901966 wrote:
ssmith61 wrote:
sport1901966 wrote:
All seem like symptoms of a really poor mixture to me, maybe hooking up to diagnostics kit will point out any dodgy sensors. When you start it try unpluging the coolant temperature sensor (blue plug on the thermostat I believe) as dodgy signals from this to the ecu can cause a bad mixture and would make starting very difficult.

Mixture problems would explain the popping and poor running to. Thats where I'd have my money.


I will give that a go aswell. Something thats just came to mind it could be a leaking inlet mani gasket. Cheers


Has it been disturbed at some point then? The running sounds more like a rich mixture problem than lean but it certainly is possible.


It hasn'nt no, i went around the gasket with it running squrting wd40 to see if it was drawing air anywhere but didnt seem too. I agree it does sound like there too much fuel getting in there.
Posted 11th Jan 2010 at 01:44
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smegal

Seasoned Pro

Location: Leeds

Registered: 26 Dec 2005

Posts: 5,940

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Post #20
sport1901966 wrote:
All seem like symptoms of a really poor mixture to me, maybe hooking up to diagnostics kit will point out any dodgy sensors. When you start it try unpluging the coolant temperature sensor (blue green plug on the thermostat I believe) as dodgy signals from this to the ecu can cause a bad mixture and would make starting very difficult.

Mixture problems would explain the popping and poor running to. Thats where I'd have my money.

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Now in a Megane R26
Posted 11th Jan 2010 at 01:48
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darkgti6

Seasoned Pro

Location: Bracknell

Registered: 07 Jun 2008

Posts: 1,361

Status: Offline
Post #21
Also a faulty lambda sensor can cause fueling problems. If there is no feed from the lambda at all it can cause the ecu to revert to run a basic map which would over fuel!

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Black T'99 Gti - may she rest in peace - written off in a shunt on the A329m
Posted 11th Jan 2010 at 02:28
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ssmith61

Newbie

Location: eastbourne

Registered: 10 Jan 2010

Posts: 37

Status: Offline
Post #22
sport1901966 wrote:
All seem like symptoms of a really poor mixture to me, maybe hooking up to diagnostics kit will point out any dodgy sensors. When you start it try unpluging the coolant temperature sensor (blue plug on the thermostat I believe) as dodgy signals from this to the ecu can cause a bad mixture and would make starting very difficult.

Mixture problems would explain the popping and poor running to. Thats where I'd have my money.


I have disconnected the green plug on the thermostat housing and it has improved so i have ordered a new sensor. Its still very slow but is running alot better cheers mate, i will post up results when new one is fitted
Posted 11th Jan 2010 at 18:29
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peugeot dave

Regular

Location: southampton

Registered: 04 Aug 2009

Posts: 227

Status: Offline
Post #23
Have you managed to get hold of the compression test results.

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Posted 11th Jan 2010 at 22:35
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sport1901966

Senior User

Location: Hertfordshire/Epsom

Registered: 17 Aug 2006

Posts: 687

Status: Offline
Post #24
ssmith61 wrote:
sport1901966 wrote:
All seem like symptoms of a really poor mixture to me, maybe hooking up to diagnostics kit will point out any dodgy sensors. When you start it try unpluging the coolant temperature sensor (blue plug on the thermostat I believe) as dodgy signals from this to the ecu can cause a bad mixture and would make starting very difficult.

Mixture problems would explain the popping and poor running to. Thats where I'd have my money.


I have disconnected the green plug on the thermostat housing and it has improved so i have ordered a new sensor. Its still very slow but is running alot better cheers mate, i will post up results when new one is fitted


Glad to help, hopefully the new sensor will have the problem solved!
Posted 12th Jan 2010 at 00:42
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ssmith61

Newbie

Location: eastbourne

Registered: 10 Jan 2010

Posts: 37

Status: Offline
Post #25
sport1901966 wrote:
ssmith61 wrote:
sport1901966 wrote:
All seem like symptoms of a really poor mixture to me, maybe hooking up to diagnostics kit will point out any dodgy sensors. When you start it try unpluging the coolant temperature sensor (blue plug on the thermostat I believe) as dodgy signals from this to the ecu can cause a bad mixture and would make starting very difficult.

Mixture problems would explain the popping and poor running to. Thats where I'd have my money.


I have disconnected the green plug on the thermostat housing and it has improved so i have ordered a new sensor. Its still very slow but is running alot better cheers mate, i will post up results when new one is fitted


Glad to help, hopefully the new sensor will have the problem solved!


It is definatly better but still way down on power. Found out today the car will not rev to the redline, if you dip the clutch and floor it, it will only hit 6k then bogs down, i cant figure it out for the life of me! And my starting problem is still thereSad
Posted 13th Jan 2010 at 02:07
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