#1: Another misfiring problem, unsanely difficult to solve! Author: gpvecchi, Location: ItalyPosted: Wed Dec 22, 2010 2:25 pm ---- 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?
#2: Re: Another misfiring problem, unsanely difficult to solve! Author: macj, Location: EssexPosted: Wed Dec 22, 2010 2:28 pm ---- 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
#3: Re: Another misfiring problem, unsanely difficult to solve! Author: gpvecchi, Location: ItalyPosted: Wed Dec 22, 2010 3:32 pm ---- Thank you, I'll make that test... Even if everything looks in mint conditions...
#4: Re: Another misfiring problem, unsanely difficult to solve! Author: apjs87, Location: PlymouthPosted: Wed Dec 22, 2010 4:50 pm ---- What spark plugs were used?
#5: Re: Another misfiring problem, unsanely difficult to solve! Author: gpvecchi, Location: ItalyPosted: Thu Dec 23, 2010 1:56 pm ---- 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...
#6: Re: Another misfiring problem, unsanely difficult to solve! Author: gpvecchi, Location: ItalyPosted: Mon Dec 27, 2010 2:08 pm ---- 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...
#7: Re: Another misfiring problem, unsanely difficult to solve! Author: gpvecchi, Location: ItalyPosted: Fri Jan 14, 2011 2:03 pm ---- 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...
#8: Re: Another misfiring problem, unsanely difficult to solve! Author: badj, Location: WiltshirePosted: Fri Jan 14, 2011 6:19 pm ---- 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.
#9: Re: Another misfiring problem, unsanely difficult to solve! Author: NICKST, Location: Little hulton (worsley)Posted: Sat Jan 15, 2011 2:33 am ---- Are sure you used bosh super4 plugs sounds like what mine was doing with ngk plugs.
#10: Re: Another misfiring problem, unsanely difficult to solve! Author: elcamino, Location: home!Posted: Sat Jan 15, 2011 4:43 am ---- Have a look at stepper motor mate.is it working properly?
#11: Re: Another misfiring problem, unsanely difficult to solve! Author: gpvecchi, Location: ItalyPosted: Sat Jan 15, 2011 2:27 pm ---- 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...
#12: Re: Another misfiring problem, unsanely difficult to solve! Author: mattievrs, Location: LeicesterPosted: Sat Jan 15, 2011 3:25 pm ---- have you checked and/or changed the crank sensor?
#13: Re: Another misfiring problem, unsanely difficult to solve! Author: gpvecchi, Location: ItalyPosted: Sun Jan 16, 2011 8:12 am ---- Changed that one and cammes sensor...
#14: Re: Another misfiring problem, unsanely difficult to solve! Author: mattievrs, Location: LeicesterPosted: Sun Jan 16, 2011 11:08 am ---- Id also change the coolant temp sensor aswell.
#15: Re: Another misfiring problem, unsanely difficult to solve! Author: Schumi, Location: Istanbul / TurkeyPosted: Sun Jan 16, 2011 3:28 pm ---- Fuel Regulator.
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