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Author Subject: loss of power
daytime6

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Location: devizes

Registered: 20 Jul 2011

Posts: 146

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Post #1
ive had a look in search bar for what im experiencing but cant find anything.

on Thursday my car wouldn't start first time like it usually does but after a couple of turns of the key it fires up but it idle properly n slowly builds up,when its warm its fine an starts up straight away but noticed it doesn't pull like it should when you get over 4,000rpm an seems like its holding back.
ive fitted a new i.c.v an that's helped a little but but still wont start first time in the morning when its cold,have also fitted new coil packs and fuel pump relay
can anyone help me out please?
Posted 16th Dec 2012 at 19:55
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honestly3k

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Location: Berkhamsted

Registered: 06 Apr 2009

Posts: 2,390

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Post #2
Id be looking at the Lambda sensor fella. Do a search about it

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Posted 16th Dec 2012 at 20:10
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daytime6

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Location: devizes

Registered: 20 Jul 2011

Posts: 146

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Post #3
ive not that long ago replaced my lambda as the emisions for the mot,i havent checked my air filter yet but would that give a problem as ive got standard setup with a k 'n' n replacement filter ?
Posted 16th Dec 2012 at 20:21
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honestly3k

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Location: Berkhamsted

Registered: 06 Apr 2009

Posts: 2,390

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Post #4
If anything a performance air filter should improve engine response as it will improve air flow.

Whats the condition of the Cat like? Its not broken up and strangled the venting of the cylinder head has it?

Coil packs would be a thought as maybe its running on 3 cylinders but you say you have tried that!

Hopefully someone with more knowledge can give you some input

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''Oh, it does handle like a golf!'' Why drive a Golf....when you can drive a GTi-6?
Posted 16th Dec 2012 at 20:27
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daytime6

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Location: devizes

Registered: 20 Jul 2011

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Post #5
ive got a magnex decat,it runs fine when its running its just when you get to 4,000rpm then it just holds back.do the cam shaft sensor give alot of grief on theses engines?
Posted 16th Dec 2012 at 20:35
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stan_306gti6 Forum Admin

Location: Kent

Registered: 18 Jan 2004

Posts: 21,768

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Post #6
Sounds like a possible MAP sensor going faulty. Yes

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Posted 16th Dec 2012 at 23:30
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daytime6

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Location: devizes

Registered: 20 Jul 2011

Posts: 146

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Post #7
I've also changed the map sensor aswell,would the fly wheel sensor do anything to not let the engine run like it should?
Posted 16th Dec 2012 at 23:43
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bigbadbowen

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Location: Winchester

Registered: 21 Nov 2003

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Post #8
Is it a miss fire when starting from cold ?
Posted 16th Dec 2012 at 23:55
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24seven

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Location: Derby

Registered: 05 Oct 2005

Posts: 6,221

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Post #9
Sounds odd, but sometimes the ecu's "calibration" of the icv can go out, at least in my experience that's happened before and the car wouldn't idle at all or even start up without the throttle being open. Try disconnecting the battery for 10 minutes or so to reset the ecu, see if that clears it up temporarily while you work out what the underlying cause may be.

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Ph1 306 GTi 6 | RX8 231 S1 | YBR 125 Cafe Racer | MT-03 660
Posted 17th Dec 2012 at 01:06
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swiftyboi006

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Location: Maidenhead

Registered: 12 Apr 2010

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Post #10
Id go for map on this 1

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Posted 17th Dec 2012 at 17:40
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daytime6

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Post #11
I gave it a reset like you said with unplugging the battery for 10mins whilst u fitted a new map sensor but still the same takes a few times of the key to start and holding back on power Sad
Posted 17th Dec 2012 at 22:15
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bigbadbowen

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Location: Winchester

Registered: 21 Nov 2003

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Post #12
Ill ask again is there a miss fire when you get it started from cold ?
Posted 17th Dec 2012 at 22:19
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daytime6

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Post #13
Sorry for not replying,na it's splutters for a second then runs fine ,I've fitted new coil packs and spark plugs ,was thinking would the fuel filter be a problem not getting fuel to the engine not letting it start like it should ?
Posted 17th Dec 2012 at 22:24
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bigbadbowen

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Post #14
daytime6 wrote:
Sorry for not replying,na it's splutters for a second then runs fine ,I've fitted new coil packs and spark plugs ,was thinking would the fuel filter be a problem not getting fuel to the engine not letting it start like it should ?


Splutters for a second from cold sounds like a possible head gasket failure ? Moisture is getting into the cylinders and stoping combustion until it clears ?

I'd get a compression test done ASAP see if everything is ok ?

Sorry to be the barer of bad news Sad
Posted 17th Dec 2012 at 22:29
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daytime6

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Post #15
It's weird as it runs fine an pulls well up until you get to 4,000rpm which I can't get my head around,Kyle be my luck that the head gasket would be on its way out Sad
Posted 17th Dec 2012 at 22:32
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playboyb

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Location: Maidstone Son!

Registered: 27 Jun 2011

Posts: 1,464

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Post #16
I had the poor starting issues from cold before I had the hg done on the sc6

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Posted 17th Dec 2012 at 22:33
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daytime6

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Registered: 20 Jul 2011

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Post #17
Will get one done very soon though and see if it is the hg that's gone.what are they normal bared at on the gauge when testing just to now if its ok
Posted 17th Dec 2012 at 22:36
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bigbadbowen

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Post #18
Should be 200+ across all cylinders Yes
Posted 17th Dec 2012 at 22:39
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daytime6

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Location: devizes

Registered: 20 Jul 2011

Posts: 146

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Post #19
Ok cool cheers,really hope it's not its not hg as that's all I need right now
Posted 17th Dec 2012 at 22:41
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playboyb

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Location: Maidstone Son!

Registered: 27 Jun 2011

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Post #20
And a sniff test! For the sake of about £10 Thumbs up

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306 1.8 xs moonstone blue-SOLD
306 gti6 supercharged china blue-SOLD
406 coupe D9 3.0 V6-SOLD

Posted 17th Dec 2012 at 22:42
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daytime6

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Location: devizes

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Post #21
What's one of them ??
Posted 17th Dec 2012 at 22:47
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bigbadbowen

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Post #22
I have a compression tester bud can help you out if need be your not a million miles away either ?
Posted 17th Dec 2012 at 22:47
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daytime6

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Posts: 146

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Post #23
Yeah that would be handy if ya could help out
Posted 17th Dec 2012 at 22:48
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bigbadbowen

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Post #24
Sniff test checks to see if there are combustion gases in the water system Yes

Pm me when you want to do the comp test bud Thumbs up
Posted 17th Dec 2012 at 23:08
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daytime6

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Location: devizes

Registered: 20 Jul 2011

Posts: 146

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Post #25
Ah ok farnuff,ok will do cheers Smile
Posted 17th Dec 2012 at 23:20
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