mikej Posted June 23, 2009 Report Posted June 23, 2009 I have a 2001 mk2 2.3 petrol which is serviced to the hilt and runs sweet as a nut 99% of the time, its been running on LPG now for almost 3 years without any issues at all however lately ONLY from cold its running a little rough for approx 2 mins as if the car is misfiring,running lean,or a lead is arcing or for the older ones like me it feels like when you use a manual choke only the choke isn't out enough etc, once warm all is good with no issues at all. If the car is started when warm then no problems appear or when the car switches to LPG then again all is good, its only when starting from cold say first thing in the morning. This one has me beat, i have just given it a full service with new plugs, leads, airfilter, fuel filter and i have changed the injectors with some spares and its still there, i thought it maybe the fuel pump but the car pulls like a 2.3 train when warm anyone got any ideas??????? :blink: Quote
roy202 Posted June 24, 2009 Report Posted June 24, 2009 I have a 2001 mk2 2.3 petrol which is serviced to the hilt and runs sweet as a nut 99% of the time, its been running on LPG now for almost 3 years without any issues at all however lately ONLY from cold its running a little rough for approx 2 mins as if the car is misfiring,running lean,or a lead is arcing or for the older ones like me it feels like when you use a manual choke only the choke isn't out enough etc, once warm all is good with no issues at all. If the car is started when warm then no problems appear or when the car switches to LPG then again all is good, its only when starting from cold say first thing in the morning. This one has me beat, i have just given it a full service with new plugs, leads, airfilter, fuel filter and i have changed the injectors with some spares and its still there, i thought it maybe the fuel pump but the car pulls like a 2.3 train when warm anyone got any ideas??????? :blink:ive known cars to run rough having a faulty temp sensor, the car thinks its warm and so doesnt run whith the auto choke if you know what i mean, its a long shot but i would test the sensors with vag-com and see if the reading are correct just to rule it out? Quote
mikej Posted June 24, 2009 Author Report Posted June 24, 2009 Thanks for reply, can vagcom be used on a ford 2.3 engine then ? Quote
seatkid Posted June 24, 2009 Report Posted June 24, 2009 In the past members with LPG issues usually trace rough running as either air intake leaks or weak ignition (leads) Quote
insider Posted June 25, 2009 Report Posted June 25, 2009 Thanks for reply, can vagcom be used on a ford 2.3 engine then ?No, VAG-COM will not work with the 2.3 engine. Quote
mikej Posted July 6, 2009 Author Report Posted July 6, 2009 Ok people really need some help on this one now, i have replaced the injectors,leads,plugs correctly gapped,airfilter,fuel filter and filled with a full fresh tank of juice. Forget the LPG if i deselect the lpg altogether and start the car as normal on petrol not touching the accelarator at all the car will tick over fine with no issues and after about 60 secs of ticking over it will drive normal with no issues at all from the word go, if however i do the same start as normal but try to drive off straight away it drives like its on 3 cylinders bunny hopping up the road untill again approx 60 secs later then it's fine, this is happening if the car is started after about 2 hours sitting idle so i suppose when cold, cannot find any split or holed hoses etc anywhere, could it be a duff temp sensor as mentioned, if so can this be checked with a good one prior to removal ie resistance etc??? after the initial 60 secs the car drives faultless no smoke,leaks rattles so it's bloody annoying to say the least!. :lol: Quote
mikej Posted August 1, 2009 Author Report Posted August 1, 2009 Now just replaced the coil pack and the said temp sender unit, problem is still there, only from cold and only when starting up on petrol for 2 mins then car is sweet as a nut. This feels like a fuelling issue or lack of it, would i be right in assuming that if it was an injector,fuel pump, plug, lead or filter issue then this symptom would appear more so under load ? Also can anyone with the mk2 2.3 tell me what your car idles at ( RPM ) when first started from cold on auto choke as although mines working it does seem a little low.cheersmike... Quote
seatkid Posted August 1, 2009 Report Posted August 1, 2009 (edited) I take it those plugs were new and not just replaced cos they look OK? Further ideas, reset the ECU by disconnecting battery for a couple of minutes (check you have the radio code first!). This is dump any "learnt" values. Could be lambda probe faulty or disconnected. Has the ECU or ignition timing been altered to accomodate LPG? Been reading a lot of late of valve/piston damage caused by LPG, showing up at 2 -3 years........burnt exhaust valves can give bunny hopping symptom. Edited August 1, 2009 by seatkid Quote
sepulchrave Posted August 2, 2009 Report Posted August 2, 2009 Does the engine tick over at a higher speed than when warm? If not then there is a problem with the cold start circuit somewhere. Actually I suspect the cold start circuit anyway since it is timed and not dependant on engine temperature once activated, the ECU only checks the temperature to decide whether to activate the cold start sequence or not, this is a feature of modern lean burn engines which can be difficult to start even when still warm. The lambda probe is not referenced until normal running is resumed so I doubt it's this. Quote
mikej Posted August 2, 2009 Author Report Posted August 2, 2009 Thanks for the replys guys as said this has me really stumped but will no doubt be something stupid, luckily i have a spare very low miles engine complete with all ancills so it's not off to the dealer everytime i need to replace parts. I have tried resetting the ECU several times with no joy, even left the battery off for a week while away but still the same. The plugs were brand new NGK'S correctly gapped however the old ones also NGK'S were only 6k old, since fitting the LPG some three years ago now it's been fault free and the engine runs dare i say it perfect, i did however fit a valve lubrication kit from day one and i check weekly it's working as it should be, did think lambda but as mentioned i thought this didn't come into play untill after the auto choke( cold start) was finished?, the LPG by the way is run via it's own ECU so no alterations were made to the existing ECU parameters. The tick over on startup is approx 1200 RPM so it's coming on when warm the cars sticks solid to around 700 with no bouncing and is really smooth. This problem is only for the first 2 mins or so after that i cannot fault the engine in any way as it runs spot on. Next thing to try i think is the idle control value i think although i have to admit i am clutching at straws? :rolleyes: Quote
mikej Posted August 21, 2009 Author Report Posted August 21, 2009 Looking for a little assistance please, can anyone post a diagram possibly from TIS of the hoses that i need to check on the intake for leaks with regards to the above fault, still cannot find anything but maybe i'm missing something, any other ideas also welcome as this is slowly driving me nuts ??? Quote
cyborg Posted August 21, 2009 Report Posted August 21, 2009 ELM327 is to zetec as vag is to vw/audi engines http://www.download.com/PCMScan/3000-2056_4-10881065.html http://www.wgsoft.de/download/ScanMasterELM_DEMO_1.7.0.0.zip could be worth buying http://cgi.ebay.co.uk/ELM-327-USB-CAR-DIAG...id=p3286.c0.m14 Quote
mikej Posted August 21, 2009 Author Report Posted August 21, 2009 Can anyone tell me which parts make up the cold start circuit and give a rough idea on how it works please?? Quote
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