Usually head gasket sign. Plugs good?

Considering the cost of a CTS you might as well change it. They are pretty cheap.

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Nothing to see here

Update on this replaced the CTS and the problem still exists and is driving me a bit mad! I've read so many threads similar to this and other forums and think it might be fuel related.

Car starts when cold flawlessly, take it out even for a short journey turn it off and restart it and it missfires on turnover for a second. I don't even think the car could be that hot after a 10 min journey with max revs of 3k either. It idles slightly lumpy after starting but after a couple of mins the idle is solid as a rock, however today whilst waiting at lights i could feel the engine almost pulsing, not like the normal vibrations.

What would be difference between restarting after a short run and it starting perfectly having left it overnight? I can only think of temperature and maybe something fuel pressure related perhaps or some kind of heatsoak (standard airbox with K&N panel btw).

The car seems to lack that punch below 3k rpm that i'd expect from a 6 and actually feels more torquey driving around in the higher gears at lower revs than the lower gears.

I've pulled each coil pack plug with the engine running and the engine note changed for each one, so they seem good.

On my list of possible causes i have:

Cam sensor
TPS
Lambda (although unlikely as it passed its MOT, reading of 1.02, and the car doesnt judder with 90% perfect idle)
Coilpacks (tested as mentioned)
Leaky injector/s
Fuel pressure regulator
MAP sensor (brand new 3 weeks ago, although the throttle body was very oily, so might have dirtied the new sensor a bit)
Small blow in the centre section of exhaust.

Can anyone suggest whether any of the above would definitely not be the issue. It almost seems like the beginning of something hence why it's so hard to pinpoint. I understand this is a bit of long shot but any light shed would be appreciated as i really want to start enjoying this car!

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"We never have any near misses, we hit them every time!"

clicky code for my benefit

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thought the lambda wasn't used on startup?

________________________________________

"We never have any near misses, we hit them every time!"

clicky code for my benefit

[ url= http://www.website.com]My link[/url ]

on cold startup the lambda is ignored... it takes a while for it to get upto temperature..

the heating element in the probe is what fails! on warm startup, the ecu thinks the lambda is ready, but if it isnt it will not show a correct reading of your avg afr!

get it on diagnostics, it will show up on a trace!

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Team Supercharged Gti-6

NV Motorsport
Automotive Performance Tuning
0121 448 7515
ECU Remapping/ DPF removal
VAG/BMW Diag and Option Coding
Peugeot Planet ECU coding/transponder programming etc
www.nvmotorsport.com
Facebook Page
Project S6

This problem very much sounds like mine im having

Ive had the car since March, and its always felt like it was ready to go with good low down torque.

The headgasket blew recently and ive had it changed, however since getting the car back, my problem sounds very much like yours, also noticed its really bad on fuel than it used to be

My lambda is a bosch one and i purchased it BRAND NEW 4 months ago, had a diagnostic done and he told me the lambda is performing correctly

Im going to try a TPS as i had a problem with this before, jerky changes, poor power and bad MPG, i bought a second hand one last time and im unsure as to whether its actually worked, best way is to unplug it, if your MPG improves you will know this is the culprit, but you will also notice the loss of power by unplugging it

Good luck with it and keep us updated, ill be unplugging mine tommorow so will update in a week to see how its been behaving

These cars really are a labour of love

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Audi S3 Black Edition

update: Today i replaced:

the fuel pressure regulator,
cleaned out the throttle body,
replaced the TPS,
cleaned the ICV.

No change, in fact, i think it feels a bit worse, so i reckon ill be sticking the old TPS back in tomorrow. Car is so sluggish, doesnt rev freely really. Couldn't replace the lambda cos i couldn't get it out, tried so hard but its stuck fast. When i was down there i noticed the car has a pattern CAT which is also a bit noisey, wondering whether its knackered, hence the sluggishness. Thinking bout getting a decat and whacking the new lambda into it, perhaps do it next weekend. Noticed some signs of oil and water mixing around the throttle body, particularly in the hose from the crankcase and in the smaller hose running from near the throttle heater round up to the left hand side of the engine bay, looked a bit like baileys. Slightly worrying considering ive just had the headgasket done at Carls, also got a big drop in coolant and a bit of a drop in oil. Needless to say i'm a tad concerned now.

________________________________________

"We never have any near misses, we hit them every time!"

clicky code for my benefit

[ url= http://www.website.com]My link[/url ]

not yet no unfortunately it wouldn't budge, tried wd40, extension bars, felt like i was about to tear the exhaust off, but it still wouldnt undo.

________________________________________

"We never have any near misses, we hit them every time!"

clicky code for my benefit

[ url= http://www.website.com]My link[/url ]

I'd get it to where did the HG and get them to check it over.

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Ex SC-6

Now in a Megane R26

The misfire is the idle goin lean.. this due to faulty lambda.. get it on a proper peugeot diagnostics rather than spending money on pointless things.

________________________________________

Team Supercharged Gti-6

NV Motorsport
Automotive Performance Tuning
0121 448 7515
ECU Remapping/ DPF removal
VAG/BMW Diag and Option Coding
Peugeot Planet ECU coding/transponder programming etc
www.nvmotorsport.com
Facebook Page
Project S6

£35 for diagnostics mate.. this includes sensor tracing of TPS, MAP, LAMBDA to define the fault. Obviously most just offer a fault code which the mm 1ap ecu doesnt tend to do!

Give us a shout mate

________________________________________

Team Supercharged Gti-6

NV Motorsport
Automotive Performance Tuning
0121 448 7515
ECU Remapping/ DPF removal
VAG/BMW Diag and Option Coding
Peugeot Planet ECU coding/transponder programming etc
www.nvmotorsport.com
Facebook Page
Project S6