fatz Posted January 26, 2014 Share Posted January 26, 2014 Happened to me once Overheated rb and the block was not true, has a headgasket leak they came and went depending on temp Link to comment https://www.sau.com.au/forums/topic/438150-cylinder-1-dropping-completely/page/2/#findComment-7181066 Share on other sites More sharing options...
XKLABA Posted January 26, 2014 Share Posted January 26, 2014 I tried this - water didn't really bubble. A tiny amount of white froth developed as the coolant started to get hot. Not sure if that's meant to happen but I read up that it froths a little when the radiator starts to build up pressure. Massive head f**k it has become! that sound about right and my best guess is HG, just enough to upset the cylinder pressures Link to comment https://www.sau.com.au/forums/topic/438150-cylinder-1-dropping-completely/page/2/#findComment-7181070 Share on other sites More sharing options...
Blackkers Posted January 27, 2014 Share Posted January 27, 2014 I have a feeling it's the injector. Are you sure they're brand new? I bought the fiveo 1000cc injectors and they are 2nd hand high flows and one even had surface rust. I wouldn't recommend the high flows really. It can be difficult to cold start my engine now. Link to comment https://www.sau.com.au/forums/topic/438150-cylinder-1-dropping-completely/page/2/#findComment-7181304 Share on other sites More sharing options...
SkudR33 Posted January 27, 2014 Author Share Posted January 27, 2014 that sound about right and my best guess is HG, just enough to upset the cylinder pressuresI might buy a block tester to check your theory! Thanks for your advice...I have a feeling it's the injector. Are you sure they're brand new? I bought the fiveo 1000cc injectors and they are 2nd hand high flows and one even had surface rust. I wouldn't recommend the high flows really. It can be difficult to cold start my engine now.Yeh they were brand new. Even looked new - I knew they were shit injectors but needed something temporarily. You guys think it's a good idea to remove the first injector and then plug it in and crank car over to physically make sure petrol is getting squirted out of the injector? A bit of a big job to swap 1st and 2nd injectors as they are side feed and I'd have to remove the plenum. Link to comment https://www.sau.com.au/forums/topic/438150-cylinder-1-dropping-completely/page/2/#findComment-7181497 Share on other sites More sharing options...
..::R33GTS-T::.. Posted January 27, 2014 Share Posted January 27, 2014 (edited) I might buy a block tester to check your theory! Thanks for your advice...Yeh they were brand new. Even looked new - I knew they were shit injectors but needed something temporarily. You guys think it's a good idea to remove the first injector and then plug it in and crank car over to physically make sure petrol is getting squirted out of the injector? A bit of a big job to swap 1st and 2nd injectors as they are side feed and I'd have to remove the plenum. id defiantly give it a go, worst case after you pull everything out is that It works, then you know the injectors wont be the issue.. my old pulsar was misfiring on 1st cylinder, replaced leads, plugs, did a compression test, exc.. it was a little water in the dizzy cap... got nothing to do with rb`s but it was just a simple problem... Edited January 27, 2014 by ..::R33GTS-T::.. 1 Link to comment https://www.sau.com.au/forums/topic/438150-cylinder-1-dropping-completely/page/2/#findComment-7181538 Share on other sites More sharing options...
Ben C34 Posted January 27, 2014 Share Posted January 27, 2014 I might buy a block tester to check your theory! Thanks for your advice...Yeh they were brand new. Even looked new - I knew they were shit injectors but needed something temporarily. You guys think it's a good idea to remove the first injector and then plug it in and crank car over to physically make sure petrol is getting squirted out of the injector? A bit of a big job to swap 1st and 2nd injectors as they are side feed and I'd have to remove the plenum. Won't there be a huge hole in the rail if you pull one injector out? Link to comment https://www.sau.com.au/forums/topic/438150-cylinder-1-dropping-completely/page/2/#findComment-7181552 Share on other sites More sharing options...
boostn0199 Posted January 27, 2014 Share Posted January 27, 2014 I might buy a block tester to check your theory! Thanks for your advice...Yeh they were brand new. Even looked new - I knew they were shit injectors but needed something temporarily. You guys think it's a good idea to remove the first injector and then plug it in and crank car over to physically make sure petrol is getting squirted out of the injector? A bit of a big job to swap 1st and 2nd injectors as they are side feed and I'd have to remove the plenum. You can change injectors without taking plenum off just need to take T/b off. I would say swap them small job for ruling something out. Link to comment https://www.sau.com.au/forums/topic/438150-cylinder-1-dropping-completely/page/2/#findComment-7181561 Share on other sites More sharing options...
SkudR33 Posted January 27, 2014 Author Share Posted January 27, 2014 Won't there be a huge hole in the rail if you pull one injector out? Hahahaha... I obviously didn't think that through! I might try removing the TB and swapping the injectors around. I'll keep you guys filled in - thanks for the help! Link to comment https://www.sau.com.au/forums/topic/438150-cylinder-1-dropping-completely/page/2/#findComment-7181564 Share on other sites More sharing options...
XKLABA Posted January 27, 2014 Share Posted January 27, 2014 Swap injectors first even if it's just to eliminate them, that is much easier then doing the HG Link to comment https://www.sau.com.au/forums/topic/438150-cylinder-1-dropping-completely/page/2/#findComment-7181763 Share on other sites More sharing options...
nicksamaniac Posted January 28, 2014 Share Posted January 28, 2014 If you want to rule out the headgasket, there is a chemical test you use on the radiator to see if combustion chemicals (namely hydrocarbons) are entering the cooling system. I've used this on a diesel patrol and it's a good way to easily test instead of removing the head if it is ok. I got mine from Nissan (test kit). But i Borrowed the tool that screws onto the filler neck for the kit to fit into. bit like a pressure test tool. Link to comment https://www.sau.com.au/forums/topic/438150-cylinder-1-dropping-completely/page/2/#findComment-7182099 Share on other sites More sharing options...
GTSBoy Posted January 28, 2014 Share Posted January 28, 2014 If you want to rule out the headgasket, there is a chemical test you use on the radiator to see if combustion chemicals (namely hydrocarbons) are entering the cooling system. I've used this on a diesel patrol and it's a good way to easily test instead of removing the head if it is ok. I got mine from Nissan (test kit). But i Borrowed the tool that screws onto the filler neck for the kit to fit into. bit like a pressure test tool. These kits are actually looking for dissolved CO2, not hydrocarbons. 1 Link to comment https://www.sau.com.au/forums/topic/438150-cylinder-1-dropping-completely/page/2/#findComment-7182119 Share on other sites More sharing options...
nicksamaniac Posted January 29, 2014 Share Posted January 29, 2014 Co2 being a product of a hydrocarbon mixed with o2 to produce it, so yes you are right! Link to comment https://www.sau.com.au/forums/topic/438150-cylinder-1-dropping-completely/page/2/#findComment-7183217 Share on other sites More sharing options...
SkudR33 Posted January 29, 2014 Author Share Posted January 29, 2014 Just getting hammered at work - I'll keep you guys filled in on the progress I make! Link to comment https://www.sau.com.au/forums/topic/438150-cylinder-1-dropping-completely/page/2/#findComment-7183225 Share on other sites More sharing options...
SkudR33 Posted February 5, 2014 Author Share Posted February 5, 2014 Update and questions... Ecu is not my problem - tried a working ecu and it still dropped the cylinder. Tested coolant for exhaust fumes... The test came back negative for exhaust fumes. Tested injector driver voltages... Injectors 2-6 have a voltage (on the driver wire) of 14.3-14.7, however injector 1 (which relates to the dropping cylinder) had a voltage of 12.8-13.7. I have no idea how voltage relates to injector timing and tried to search but found the information was way too technical for me! Does anybody know if this could be causing the cylinder to misfire??? Thanks for the help guys! Link to comment https://www.sau.com.au/forums/topic/438150-cylinder-1-dropping-completely/page/2/#findComment-7190267 Share on other sites More sharing options...
GTSBoy Posted February 5, 2014 Share Posted February 5, 2014 Low voltage will increase the latency and reduce the total opening, leading to slightly less fuel in total, but it shouldn't miss that badly. But low voltage static might indicate a bad joint or something that will drop the voltage further when it's under load (ie when the injector coil is earthed and operating). Link to comment https://www.sau.com.au/forums/topic/438150-cylinder-1-dropping-completely/page/2/#findComment-7190281 Share on other sites More sharing options...
scotty nm35 Posted February 5, 2014 Share Posted February 5, 2014 Injector voltage is critical to their operation so I would be looking further into that. Perhaps the ground side is earthing slightly, which may cause the injector to leak. Link to comment https://www.sau.com.au/forums/topic/438150-cylinder-1-dropping-completely/page/2/#findComment-7190285 Share on other sites More sharing options...
SkudR33 Posted February 5, 2014 Author Share Posted February 5, 2014 Injector voltage is critical to their operation so I would be looking further into that. Perhaps the ground side is earthing slightly, which may cause the injector to leak. I managed to get lucky in the sense that for about 1 minute the car stop misfiring and it gave me time to check that voltage... I've discovered that when the car stopped misfiring the injector voltage went back up to around 14.3-14.7. It seems as though I've located where the problem is... Now it's a matter of trying to solve it. I'll keep you guys updated. Cheers Link to comment https://www.sau.com.au/forums/topic/438150-cylinder-1-dropping-completely/page/2/#findComment-7190347 Share on other sites More sharing options...
SkudR33 Posted February 5, 2014 Author Share Posted February 5, 2014 I've found my issue - faulty injector. If I give it a few love taps, the voltage rises up to normal and it works fine. Anyone care to explain why that would be happening (for educational purposes) and is there any home fixes or do I have to replace it? Link to comment https://www.sau.com.au/forums/topic/438150-cylinder-1-dropping-completely/page/2/#findComment-7190415 Share on other sites More sharing options...
GTSBoy Posted February 5, 2014 Share Posted February 5, 2014 Replace. It will have a short in the coil or something similar. Link to comment https://www.sau.com.au/forums/topic/438150-cylinder-1-dropping-completely/page/2/#findComment-7190442 Share on other sites More sharing options...
SkudR33 Posted February 5, 2014 Author Share Posted February 5, 2014 Yeh I definitely will - don't ever wanna go through the headache again! Thanks to anybody who contributed to the thread... For future purposes and research, voltages on the injectors should be checked as it turns out a drop of 0.3 volts can cause a whole cylinder to drop! Link to comment https://www.sau.com.au/forums/topic/438150-cylinder-1-dropping-completely/page/2/#findComment-7190469 Share on other sites More sharing options...
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