Yowzer Posted December 13, 2010 Share Posted December 13, 2010 Yah, so engine is a '95? VR 3.8, running off factory VN loom etc. It ain't running right, using tonnes of gas, low on power, seems to be down on a cylinder. 5/6 sparkplugs are still crispy white, while cylinder 1 is a bit different As you can see. Cyl 1 plug on left. I have been unable to do a compression test as my gauge does not fit the engine. Spark plug 1 also seemed to have a bit of oil on it, but whether this was contamination from outside the engine or not I'm not sure. Car does not appear to smoke at all, and the engine runs pretty smooth, but it is definitely lacking a bit of up and go. It also only gets 6 odd Ks to the litre, which is pretty piss-poor. Kind of concerned at the mild knocking sound it seems to have developed, hoping it's just the sound of a dead cylinder as opposed to a fucked bearing.... Anyway any help or ideas as to what may be going on would be sweet. Quote Link to comment Share on other sites More sharing options...
shizzl Posted December 13, 2010 Share Posted December 13, 2010 check coil pack earth.... possibly faulty ign sensor.. both common probs in stockcars Quote Link to comment Share on other sites More sharing options...
Yowzer Posted December 13, 2010 Author Share Posted December 13, 2010 Yeah I did consider the coil pack, but if it was a problem with that, it'd effect multiple cylinders wouldn't it? Being wasted spark and all. Quote Link to comment Share on other sites More sharing options...
shizzl Posted December 13, 2010 Share Posted December 13, 2010 not always.... Quote Link to comment Share on other sites More sharing options...
shizzl Posted December 13, 2010 Share Posted December 13, 2010 oh has it been running sweet with the vn loom before?? and just started doing this?? Quote Link to comment Share on other sites More sharing options...
Yowzer Posted December 13, 2010 Author Share Posted December 13, 2010 Yeah it ran fine briefly, initially it was running shit as it was running on 3 year old gas and old spark plugs. After a new tank of gas and new plugs, it ran perfectly mint for awhile. But then it turned to shit. Quote Link to comment Share on other sites More sharing options...
Unclejake Posted December 13, 2010 Share Posted December 13, 2010 I would say that those plugs have been washed clean by far too much fuel. AFM? Quote Link to comment Share on other sites More sharing options...
peteretep Posted December 13, 2010 Share Posted December 13, 2010 injectors need cleaning? Quote Link to comment Share on other sites More sharing options...
Jase Posted December 14, 2010 Share Posted December 14, 2010 make sure your crank angle sensor is plugged in tight, and also check the pins on the coilpack plug male and female ( the female side is prone to getting wriggled loose, pick them tight with a small pin) it will be one of these little probs for sure. most likely the loom is pulling on the coilpack plug loosening up the pins one other common thing is the plate under the coilpacks can give up, check this by removing them leave it plugged in and turn the ignition on if it gets hot its that. Quote Link to comment Share on other sites More sharing options...
Jase Posted December 14, 2010 Share Posted December 14, 2010 sell it to me? Quote Link to comment Share on other sites More sharing options...
Yowzer Posted December 14, 2010 Author Share Posted December 14, 2010 I would say that those plugs have been washed clean by far too much fuel.AFM? Plugs are brand new, only around 600km on them so far. Engine runs MAP. Was thinking something could be wrong with the injectors, but have yet to test. There shouldn't be any difference between the VN and VR injectors should there? Quote Link to comment Share on other sites More sharing options...
Yowzer Posted December 14, 2010 Author Share Posted December 14, 2010 Will check the coil pack tonight. Quote Link to comment Share on other sites More sharing options...
johnnyfive Posted December 14, 2010 Share Posted December 14, 2010 On the note of injectors, Some have a metal gauze in the tip I believe which can get gacked up. Jam screw into gauze, remove. Quote Link to comment Share on other sites More sharing options...
Yowzer Posted December 14, 2010 Author Share Posted December 14, 2010 make sure your crank angle sensor is plugged in tight,and also check the pins on the coilpack plug male and female ( the female side is prone to getting wriggled loose, pick them tight with a small pin) it will be one of these little probs for sure. most likely the loom is pulling on the coilpack plug loosening up the pins one other common thing is the plate under the coilpacks can give up, check this by removing them leave it plugged in and turn the ignition on if it gets hot its that. Plate under coilpacks? How do ya mean? The bottom of the coil pack is pretty bloody hot, even after 1 1/2 hours of sitting. Quote Link to comment Share on other sites More sharing options...
Jase Posted December 14, 2010 Share Posted December 14, 2010 theres yah problem then the plate that the coilpacks screw to should get warm but not hot, welcome to come throw a set of my coils on it. or kelvin will sort you out some second hand ones no doubt Quote Link to comment Share on other sites More sharing options...
barf Posted December 15, 2010 Share Posted December 15, 2010 primary winding on a healthy coil should measure 0.5 - 1.5Ω.. maybe up to 2.0Ω hopefully it's not your ignition module. USD$75+pp for one of these, strong kiwi dollar atm too (NZD$99) Quote Link to comment Share on other sites More sharing options...
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