Post #26
Unplugging the MAP sensor should make it stall. 
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"Supercharged - 454.1bhp/317.5lb/ft"Peugeot 306 GTi-6
2000 (X), Moonstone
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| Author | Subject: misfiring badly |
 stan_306gti6
Forum Admin Location: Kent Registered: 18 Jan 2004 Posts: 21,768 Status: Offline |
Peugeot 306 GTi-6 2000 (X), Moonstone |
 Posted 14th Jun 2014 at 17:15
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RetroPug
Seasoned Pro  Location: Leicestershire Registered: 15 Jan 2013 Posts: 2,473 Status: Offline |
Post #27
stan_306gti6 wrote: Unplugging the MAP sensor should make it stall. Yes, hence I know it's working and the ICV is at fault.  Cjwatson27 wrote: What you after icv? Or map ICV but I'm only around tomorrow then I'm off and I'll be getting a new one when I get back. ________________________________________ 61k miles Ph.1 Diablo '6 Project Thread |
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Posted 14th Jun 2014 at 17:18
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ad
Regular  Location: High Wycombe Registered: 15 Aug 2004 Posts: 282 Status: Offline |
Post #28
Lamba sensor or coilpack maybe as I have the same problem. Try unplugging the lamba and see what happens..... I know you didn't touch any of these but i would give it a go. Good luck. |
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Posted 14th Jun 2014 at 18:07
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RetroPug
Seasoned Pro Location: Leicestershire Registered: 15 Jan 2013 Posts: 2,473 Status: Offline |
Post #29
Well the ICV is definitely broken so I'll try that first, and then coils and lambda if that fails.Thanks! ________________________________________ 61k miles Ph.1 Diablo '6 Project Thread |
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Posted 14th Jun 2014 at 18:30
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Niall
Seasoned Pro  Location: Epsom Registered: 06 Jun 2012 Posts: 1,941 Status: Offline |
Post #30
Doubtful of the lambda. It can only alter the fuelling by a small amount. No where near enough to misfire like he's describing even if it gives up completely. To me it sounds like a coil pack or possibly a CTS which is stuck at full temp fail. I know min temp fail on these is -40 degrees and it horrendously over fuels so i can only imagine max temp fail is up near 150 degrees so lean as fook |
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Posted 14th Jun 2014 at 19:01
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RetroPug
Seasoned Pro Location: Leicestershire Registered: 15 Jan 2013 Posts: 2,473 Status: Offline |
Post #31
It's not the CTS I've swapped it and it made no difference. I also doubt it's the lamda.In any case, the ICV is sticking very badly! Has anyone else had this causing a misfire and not just hunting idle? ________________________________________ 61k miles Ph.1 Diablo '6 Project Thread |
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Posted 14th Jun 2014 at 22:09
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bigbadbowen
Seasoned Pro  Location: Winchester Registered: 21 Nov 2003 Posts: 13,753 Status: Offline |
Post #32
Undo everything you have changed dude it was running fine before ? |
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Posted 15th Jun 2014 at 01:22
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RetroPug
Seasoned Pro Location: Leicestershire Registered: 15 Jan 2013 Posts: 2,473 Status: Offline |
Post #33
I swapped the PAS pump, a radiator, the aux tensioner and then while the manifold was off I swapped it for another one but built it up with all the same sensors. :SYep, was running fine. ________________________________________ 61k miles Ph.1 Diablo '6 Project Thread |
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Posted 15th Jun 2014 at 09:19
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RetroPug
Seasoned Pro Location: Leicestershire Registered: 15 Jan 2013 Posts: 2,473 Status: Offline |
Post #34
Right, back in the UK again and I'm getting really frustrated with this. Had the manifold off again and checked the alternator connections are tight, swapped MAP sensor, put on a brand new magnetti marelli ICV and the same thing is still happening. I cannot see any fuel leaks anywhere around the injectors. Tried unplugging the PAS sensor too.The new ICV doesn't seem to be getting as hot as the old one. The engine ALWAYS revs high on startup, then a blip of the throttle brings it back down to idle, where it then revs on/off on/off, it isn't really hunting like another time I had icv problems it is actually is if someone is twitching their foot on the throttle, and it knocks/misfires with a very loud bang. Help please! ________________________________________ 61k miles Ph.1 Diablo '6 Project Thread |
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Posted 7th Jul 2014 at 12:25
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pug_306
Seasoned Pro  Location: Great Hockham Registered: 28 May 2013 Posts: 1,592 Status: Offline |
Post #35
Had simular turned out to be fuel pump relay had all symptoms of a cts fault but put another relay on and sorted it.________________________________________ 1998 Supercharged White Rallye1992 205 GTi6 205 Turbo 340bhp |
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Posted 7th Jul 2014 at 12:45
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RetroPug
Seasoned Pro Location: Leicestershire Registered: 15 Jan 2013 Posts: 2,473 Status: Offline |
Post #36
Do they just spontaneously fail? This all happened right after doing all this work and I didn't touch it to my knowledge? Which one is the fuel pump relay?________________________________________ 61k miles Ph.1 Diablo '6 Project Thread |
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Posted 7th Jul 2014 at 12:55
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welshpug!
Capt Pedantic  Location: Bigend, Wales. Registered: 27 Mar 2007 Posts: 25,839 Status: Offline |
Post #37
My zx did a lot of weird stuff when the relay fell against the exhaust msnifold and melted itself to buggery.________________________________________ need a part number? get on here - http://public.servicebox.peugeot.comBring on the Trumpets. |
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Posted 7th Jul 2014 at 13:03
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armzsc6
Seasoned Pro  Location: Crowborough Registered: 22 Mar 2008 Posts: 3,445 Status: Offline |
Post #38
As I found out the other day while my crank sensor was fooked the fuel pump relay controls the feed to the coils so could be at fault. I've had lots of peugeot engines misire because of a dodgy lambda I think it's when they get false readings rather than pack up entirely as that would just run rich. Try unplugging it but to be honest none of them were bad misfires with failed lambdas and definitely not like the banging your describing. Personally I'd go back to basics and start from there.... You have a misfire, disconnect each coil individually while it's running, see which one makes no difference. Check the cam belt isn't flapping in the breeze, do a compression check. If all ok then start looking at electrical things then rather than just having a guess at some sensors. ________________________________________ Black power baby! SUUUUUPERCHARGED Seat Leon FR TDI 190BHP 300lbft daily gti-6 killer :p 12x 306's owned so far Cambelts, clutches, service work carried out on All makes and models, Peugeot Citroen / mitsubishi specialist. Pug planet / Citroen Lexia diagnostics / code reads available. |
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Posted 7th Jul 2014 at 13:18
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pug_306
Seasoned Pro Location: Great Hockham Registered: 28 May 2013 Posts: 1,592 Status: Offline |
Post #39
RetroPug wrote: Do they just spontaneously fail? This all happened right after doing all this work and I didn't touch it to my knowledge? Which one is the fuel pump relay? Meant to be bolted up behind the battery box. ________________________________________ 1998 Supercharged White Rallye1992 205 GTi6 205 Turbo 340bhp |
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Posted 7th Jul 2014 at 13:25
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RetroPug
Seasoned Pro Location: Leicestershire Registered: 15 Jan 2013 Posts: 2,473 Status: Offline |
Post #40
Can you check the relay or only really replace it?I've been guessing based on playing with everything I touched when I did all this work. The coilpack cover never even came off but I'll disconnect coils in turn this afternoon. It seems to be okay when the throttle is depressed and the revs are high, it is only running all over the place at low revs/idle. ________________________________________ 61k miles Ph.1 Diablo '6 Project Thread |
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Posted 7th Jul 2014 at 13:32
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scotzman
Seasoned Pro  Location: Dundee Registered: 24 Jun 2011 Posts: 1,408 Status: Offline |
Post #41
Have you tried the throttle position sensor?________________________________________ '90 1.6 205 GTi, '98 306 GTi-6 |
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Posted 7th Jul 2014 at 13:42
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RetroPug
Seasoned Pro Location: Leicestershire Registered: 15 Jan 2013 Posts: 2,473 Status: Offline |
Post #42
Yep, swapped it with a known working one, no difference made, and unplugged, no difference made.________________________________________ 61k miles Ph.1 Diablo '6 Project Thread |
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Posted 7th Jul 2014 at 14:01
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pug_306
Seasoned Pro Location: Great Hockham Registered: 28 May 2013 Posts: 1,592 Status: Offline |
Post #43
Sounds like the relay buddy easier just to replace it with a known good one________________________________________ 1998 Supercharged White Rallye1992 205 GTi6 205 Turbo 340bhp |
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Posted 7th Jul 2014 at 14:17
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RetroPug
Seasoned Pro Location: Leicestershire Registered: 15 Jan 2013 Posts: 2,473 Status: Offline |
Post #44
Visually inspected the relay, looks fine but that doesn't necessarily mean anything. Will wait on the spare.It started raining so will unplug coilpacks in turn later, it does sound like maybe overfuelling or fuel not igniting and then all going at once when it bangs as it is very violent banging to the point that I'm scared to run the engine for long enough to unplug coilpacks. ________________________________________ 61k miles Ph.1 Diablo '6 Project Thread |
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Posted 7th Jul 2014 at 16:49
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RetroPug
Seasoned Pro Location: Leicestershire Registered: 15 Jan 2013 Posts: 2,473 Status: Offline |
Post #45
Just a thought, could the FPR be causing this? It really does seem like the fuelling is all over the place on idle. The fuel rail is from another car but was working when removed, is swapping the FPR easy or are they difficult to remove/replace on their own?Edit: Found a thread on removing it. ________________________________________ 61k miles Ph.1 Diablo '6 Project Thread |
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Posted 7th Jul 2014 at 17:06
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ryangti6
Seasoned Pro  Location: Pontypool Registered: 01 Sep 2006 Posts: 1,839 Status: Offline |
Post #46
If youve turned the caps on the end of the injectors by accident then that could cause your issue as it messes up the spray on them. Could be worth whipping them out and checking they are all in the correct place. ________________________________________ Ryan |
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Posted 7th Jul 2014 at 17:18
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RetroPug
Seasoned Pro Location: Leicestershire Registered: 15 Jan 2013 Posts: 2,473 Status: Offline |
Post #47
Good idea, thanks. How will I know that they are out of alignment?________________________________________ 61k miles Ph.1 Diablo '6 Project Thread |
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Posted 7th Jul 2014 at 18:20
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dangti6
aka JKshooter  Location: Taunton, Somerset Registered: 15 Jun 2006 Posts: 10,305 Status: Offline |
Post #48
I had a missfire recently and it was a fouled spark plug. Have you whipped yours out and had a look at them? ________________________________________  |
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Posted 7th Jul 2014 at 19:09
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RetroPug
Seasoned Pro Location: Leicestershire Registered: 15 Jan 2013 Posts: 2,473 Status: Offline |
Post #49
I haven't no, because the engine was running nicely until I swapped the inlet manifold & fuel rail, PAS pump and radiator so I assumed it was something I'd disturbed that was the problem.The only thing I've disturbed that I haven't tried swapping back is the FPR, but that was working on the car it came off of. Very odd that it is banging, revving erratically on idle and then seems ok high up. I drove the car a couple of 100m and it wanted to kill me with wheelspin everywhere when launching, but cruising in gear at higher rpms was normal. ________________________________________ 61k miles Ph.1 Diablo '6 Project Thread |
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Posted 7th Jul 2014 at 19:18
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RetroPug
Seasoned Pro Location: Leicestershire Registered: 15 Jan 2013 Posts: 2,473 Status: Offline |
Post #50
Update:Disconnecting one coilpack makes the banging/detonating go away, but not the erratic idle. Disconnecting the others makes no difference. A fuel/ignition or double relay should be here tomorrow (thank you pug306). Changed the throttle body back to the old one to see if the butterfly plate was bad and it made no difference. I hope the fuel/ignition relay solves this, anything else it could be? Are the banging and erratic idle separate problems? ________________________________________ 61k miles Ph.1 Diablo '6 Project Thread |
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Posted 8th Jul 2014 at 14:54
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