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Another misfiring problem, unsanely difficult to solve!
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gpvecchi

Posted: Wed Dec 22, 2010 2:25 pm

Joined: Feb 08, 2010
Posts: 526
Trade Rating: 0
Location: Italy

Hi, recently my RC (GTI 180) started misfiring when cold, and even when hot, pushing on gas pedal at low revs...
I have new: sparks plugs, coilpack, rpm sensor; I recently changed MAP sensor, cleaned throttle body, and even tried adding gasoline original Pug cleaner for injection, as Info flash says...
I'm thinking at fuel pump, because engine runs linear at any rev, I have the problem only if pushing hard on pedal at low revs...
Any ideas, please?


	Silver grey RC\|Pug Sport remap\|Group A induction\|Supersprint backbox\|lower strut bar\|RCCup wishbones\|Eibach Pro-Street-S\|302mm brakes+23.8 master cylinder\|Vibra Technics\|Quaife LSD\|Cupra R splitter\|modded bonnet vent\|black Valeos\|207i tail lights\|Chromed rear foglight\|Bi-xenon 6000k+all led (in+out)\|406 rear mirror

macj

Posted: Wed Dec 22, 2010 2:28 pm

Joined: Feb 07, 2010
Posts: 3085
Trade Rating: +12
Location: Essex

Check for air leaks on the induction side..... run car at idle and use an ether based spray around joints and gaskets..... not too much at a time.. The revs will rise if you have a leak

gpvecchi

Posted: Wed Dec 22, 2010 3:32 pm

Joined: Feb 08, 2010
Posts: 526
Trade Rating: 0
Location: Italy

Thank you, I'll make that test... Even if everything looks in mint conditions...


	Silver grey RC\|Pug Sport remap\|Group A induction\|Supersprint backbox\|lower strut bar\|RCCup wishbones\|Eibach Pro-Street-S\|302mm brakes+23.8 master cylinder\|Vibra Technics\|Quaife LSD\|Cupra R splitter\|modded bonnet vent\|black Valeos\|207i tail lights\|Chromed rear foglight\|Bi-xenon 6000k+all led (in+out)\|406 rear mirror

apjs87

Posted: Wed Dec 22, 2010 4:50 pm

Joined: Feb 07, 2010
Posts: 1197
Trade Rating: +3
Location: Plymouth

What spark plugs were used?


	No longer a 206 owner Astra H sxi. 1.7Cdti

gpvecchi

Posted: Thu Dec 23, 2010 1:56 pm

Joined: Feb 08, 2010
Posts: 526
Trade Rating: 0
Location: Italy

Stock PUG spark plugs... I forgot I have changed upper lambda sensor... As I'll have some time I'll try macj's test and I will test fuel pression, too...


	Silver grey RC\|Pug Sport remap\|Group A induction\|Supersprint backbox\|lower strut bar\|RCCup wishbones\|Eibach Pro-Street-S\|302mm brakes+23.8 master cylinder\|Vibra Technics\|Quaife LSD\|Cupra R splitter\|modded bonnet vent\|black Valeos\|207i tail lights\|Chromed rear foglight\|Bi-xenon 6000k+all led (in+out)\|406 rear mirror

gpvecchi

Posted: Mon Dec 27, 2010 2:08 pm

Joined: Feb 08, 2010
Posts: 526
Trade Rating: 0
Location: Italy

It seems that the second can of 9729FF Peugeot cleaner (as the info flash says) solved the problem... There seems to be some deposit of a gasoline component that dirty intake manifold inside the engine head (something like "calamina"); that's a specific product to clean that kind of component...


	Silver grey RC\|Pug Sport remap\|Group A induction\|Supersprint backbox\|lower strut bar\|RCCup wishbones\|Eibach Pro-Street-S\|302mm brakes+23.8 master cylinder\|Vibra Technics\|Quaife LSD\|Cupra R splitter\|modded bonnet vent\|black Valeos\|207i tail lights\|Chromed rear foglight\|Bi-xenon 6000k+all led (in+out)\|406 rear mirror

gpvecchi

Posted: Fri Jan 14, 2011 2:03 pm

Joined: Feb 08, 2010
Posts: 526
Trade Rating: 0
Location: Italy

Well, no, problem seemed to be solved, but it's here again! No air leakage as macj said. It's not something like an "empty" in acceleration, but it's one cylinder that doesn't fire correctly...


	Silver grey RC\|Pug Sport remap\|Group A induction\|Supersprint backbox\|lower strut bar\|RCCup wishbones\|Eibach Pro-Street-S\|302mm brakes+23.8 master cylinder\|Vibra Technics\|Quaife LSD\|Cupra R splitter\|modded bonnet vent\|black Valeos\|207i tail lights\|Chromed rear foglight\|Bi-xenon 6000k+all led (in+out)\|406 rear mirror

badj

Posted: Fri Jan 14, 2011 6:19 pm

Joined: Dec 17, 2010
Posts: 144
Trade Rating: +1
Location: Wiltshire

Might be worth swapping the injector for that cylinder with another (even the one from another cylinder) and see if the problem 'moves' to another cylinder. I've had it before where nothing will clean the injector, and only replacement will do.

Without any useful data (i.e. by reading live data via OBD) its just a case of trial and error with a few components.

First thing I would do is to 'read' the spark plugs. You might just get a hint of what the problem is by looking at the plug (i.e. wet would indicate possible weak spark, overly burnt/damaged tip would indicate lean misfire).

Thats if its cylinder-specific, and a misfire not a general splutter.


	Iceland Blue '99 206 GTI (140) - SOLD KMF '05 1.4 HDi

NICKST

Posted: Sat Jan 15, 2011 2:33 am

Joined: Feb 10, 2010
Posts: 904
Trade Rating: +5
Location: Little hulton (worsley)

Are sure you used bosh super4 plugs sounds like what mine was doing with ngk plugs.


	Image removed due to size focus st 3 with pro alloy intercooler, 3" mongoose down pipe, 200 cell sports cat and mongoose cat back, collins bov, dreamscience dsci cold air intake,focus rs injectors,focus rs oil cooler,dreamscience dsci tuneing platform mod X map,focus rs clutch & flywheel, rs fuel pump, polly bushes in wish bones rear axal and suspension white line front and rear arb, eibach pro street s suspension.

elcamino

Posted: Sat Jan 15, 2011 4:43 am

Joined: Apr 26, 2010
Posts: 314
Trade Rating: 0
Location: home!

Have a look at stepper motor mate.is it working properly?


	el camino. "Whether you think you can or you think you can't, you're right" Henry Ford.

gpvecchi

Posted: Sat Jan 15, 2011 2:27 pm

Joined: Feb 08, 2010
Posts: 526
Trade Rating: 0
Location: Italy

Well, I'll have to test injectors with specific instuments. Swapping with another will probably mantain the problem (to another cylinder); my motorized valve works perfectly (checked with PPS 2000). Strange thing it's that the problem occurs randomly, and even when it appears, engine is running perfectly at constant gas pedal...


	Silver grey RC\|Pug Sport remap\|Group A induction\|Supersprint backbox\|lower strut bar\|RCCup wishbones\|Eibach Pro-Street-S\|302mm brakes+23.8 master cylinder\|Vibra Technics\|Quaife LSD\|Cupra R splitter\|modded bonnet vent\|black Valeos\|207i tail lights\|Chromed rear foglight\|Bi-xenon 6000k+all led (in+out)\|406 rear mirror

mattievrs

Posted: Sat Jan 15, 2011 3:25 pm

Joined: Feb 07, 2010
Posts: 2248
Trade Rating: +18
Location: Leicester

have you checked and/or changed the crank sensor?


	NO LONGER ACTIVE ON THE FORUM

gpvecchi

Posted: Sun Jan 16, 2011 8:12 am

Joined: Feb 08, 2010
Posts: 526
Trade Rating: 0
Location: Italy

Changed that one and cammes sensor...


	Silver grey RC\|Pug Sport remap\|Group A induction\|Supersprint backbox\|lower strut bar\|RCCup wishbones\|Eibach Pro-Street-S\|302mm brakes+23.8 master cylinder\|Vibra Technics\|Quaife LSD\|Cupra R splitter\|modded bonnet vent\|black Valeos\|207i tail lights\|Chromed rear foglight\|Bi-xenon 6000k+all led (in+out)\|406 rear mirror

mattievrs

Posted: Sun Jan 16, 2011 11:08 am

Joined: Feb 07, 2010
Posts: 2248
Trade Rating: +18
Location: Leicester

Id also change the coolant temp sensor aswell.


	NO LONGER ACTIVE ON THE FORUM

Schumi

Posted: Sun Jan 16, 2011 3:28 pm

Joined: Feb 08, 2010
Posts: 901
Trade Rating: +1
Location: Istanbul / Turkey

Fuel Regulator.


	2005 206 RC RED Bilstein B14 Coilover / Brembo 4 Pot Front 330x28 - Rear 325x8 / Quaife ATB Limited Slip Diff / Janspeed Catback Lot's of CNC machined customs pars.

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