RobPhoboS Posted December 9, 2016 Share Posted December 9, 2016 (edited) Bit of a weird one here. I was at Silverstone last weekend and had a P0300 code appear after a few (gentle) laps. Initially I thought it was the code from the exhaust due to no cats (I can't remember the 2 or 3 that pop up right now), as I get these sometimes from idling in the cold. I'm glad I came in and checked it out, I reset the error and left my car alone for the day. I haven't seen the error since last weekend, and have driven probably around 250 miles since. I know this tends to come up as a 'random misfire' but the car sounds normal to me. I'm just wondering what it could be, tomorrow I'll check the coilpacks with a multimeter. It shouldn't be the plugs as I did them back in March. I'll keep searching the forums for any potentials but any thoughts are much appreciated ! Edited January 22, 2017 by RobPhoboS Quote Link to comment Share on other sites More sharing options...
Ekona Posted December 9, 2016 Share Posted December 9, 2016 Was it raining? Or particularly cold? Quote Link to comment Share on other sites More sharing options...
RobPhoboS Posted December 9, 2016 Author Share Posted December 9, 2016 Bone dry, and around 6 deg. But one thing I'm just thinking here... The weekend before last, I changed gearbox\diff\engine oil. I'm just wondering if I needed to pop a bit more oil in the engine. As I mentioned, I wasn't going fast at all - honestly ! (my first time on track with the Z, and just getting used to it) I guess I'll know a bit more tomorrow, I've seen what the service manual describes as the potential issues. I just thought it was odd that it happened on track, the car felt and sounded normal to me. Quote Link to comment Share on other sites More sharing options...
Ekona Posted December 9, 2016 Share Posted December 9, 2016 Oil won't have caused it. Why do you think you needed more, if you only just changed it? Personally I'd have cleared the code, gone out again and given it an Italian tune up to see what happened. Quote Link to comment Share on other sites More sharing options...
RobPhoboS Posted December 9, 2016 Author Share Posted December 9, 2016 Technically I did (I guess). I did 2 laps, saw the error, cleared the code, went back out saw the error and checked it this time. I think I left a little bit more that I usually do in the oil bottle. (was just looking from what others have said) Quote Link to comment Share on other sites More sharing options...
Ekona Posted December 9, 2016 Share Posted December 9, 2016 Ah, so it came up twice. Seems sensible then. Same corner, same speed etc? Always check the level after filling, don't just go on what's left in the bottle. Just in case! 1 Quote Link to comment Share on other sites More sharing options...
RobPhoboS Posted December 10, 2016 Author Share Posted December 10, 2016 This is the car idling: When I rev the car it sounds like there is a slight vacuum leak as well, I'll upload another video for that a bit later. Quote Link to comment Share on other sites More sharing options...
ZMANALEX Posted December 10, 2016 Share Posted December 10, 2016 http://www.autocodes.com/p0300_nissan.html Quote Link to comment Share on other sites More sharing options...
RobPhoboS Posted December 10, 2016 Author Share Posted December 10, 2016 Cheers, yep I had marked down the service manual suggestions. This hopefully shows the hiss sound: I've sprayed carb cleaner around the intake but no fluctuations in idle. The resistance of the coil packs was pretty much the same for all of them. I don't have all of my tools here today so what I can check is very limited. Quote Link to comment Share on other sites More sharing options...
Toon Chris Posted December 11, 2016 Share Posted December 11, 2016 Nip up the plenum bolts just to be sure. It's quick and you will soon see if one was a bit loose-ish. Took 2 years for a leak to show round my spacer and I chased the codes for ages until I found the annoyingly simple culprit. 1 Quote Link to comment Share on other sites More sharing options...
RobPhoboS Posted December 11, 2016 Author Share Posted December 11, 2016 Crikey ! Yeah I'll have access to my tools next week, so I'll certainly try that first. I'll also see if I can replicate the error whilst driving too. Quote Link to comment Share on other sites More sharing options...
RobPhoboS Posted December 20, 2016 Author Share Posted December 20, 2016 (edited) I nipped up the bolts, I hate doing that as the small torque wrench I have for it doesn't click like normal ones. I've ordered a new coil pack, just to see if one of them is slightly duff (I'll swap it out on each one to see if it improves). I thought my idle from post #7 does sound quite similar to this guys one: Edited December 20, 2016 by RobPhoboS Quote Link to comment Share on other sites More sharing options...
RobPhoboS Posted December 26, 2016 Author Share Posted December 26, 2016 (edited) These are the Ohm readings I got set to 2k: Ohm 2k New coil = 158 Cylinder 5: Rear driver = 147 Cylinder 3: Mid driver = 153 Cylinder 1: Front driver = 164 Cylinder 6: Rear passenger = 164 Cylinder 4: Mid passenger = 153 Cylinder 2: Front passenger = 152 I'm not sure what the numbers really mean but could that be the problem? Edited December 26, 2016 by RobPhoboS Quote Link to comment Share on other sites More sharing options...
RobPhoboS Posted December 28, 2016 Author Share Posted December 28, 2016 I've ordered another coil pack to replace the other higher resistance pack, as I'm not sure if they are both the cause or not. Quote Link to comment Share on other sites More sharing options...
RobPhoboS Posted January 7, 2017 Author Share Posted January 7, 2017 I've replaced 2 of the higher reading coils now, still the same. I'll try some injector cleaner next, or may pull them all next week and clean all of them manually. Quote Link to comment Share on other sites More sharing options...
RobPhoboS Posted January 22, 2017 Author Share Posted January 22, 2017 (edited) Right, time for an update - and flipping heck it's annoying I thought it was worth removing the injectors to give them a clean, this is what came out: At the bottom of the jug after cleaning them... After putting them back in I was a bit careless (insert tired excuse here), I like a numpty didn't use any oil to lube the o-rings. Around 1 am I decided to head home. So I fired it up, let it idle for a while and went on my way. After about 5 mins I got a check engine light on, 2 of the faults were the usual cold weather and idling from the decats (o2 codes), the other was P0139 and I think P0159. I cleared it and drove on (through London, so very slow), after I got back I noticed the exhaust did smell a bit, possibly from running lean? I thought perhaps I hadn't pushed the injectors back into the block properly. So today I removed them and saw that yes I had fudged the lower o-rings up. I got some replacements that are the same thickness but slightly smaller diameter, it's all I could find on Sunday afternoon. This time I used some new oil on them, took my time and was careful putting them in. It doesn't feel like I could push them in any further, and with the bolts torqued down they are secure. I fired it up again and this time got: P1122 P0123 P0223 So I'll do the TPS reset and try again tomorrow. I did go for a short drive, initially it seemed normal but then was hesitating and sounding like a flat 4, so I came home straight away. I'll order the correct size o-rings, I did use the micrometer, they are: ID = 9mm C/S = 3mm. I did the plugs this time last year, I've not pulled them yet but will do this week. Edited January 23, 2017 by RobPhoboS Quote Link to comment Share on other sites More sharing options...
TT350 Posted January 22, 2017 Share Posted January 22, 2017 Mine had same symptoms. Spent ages trying to diagnose it. Tested coilpacks. SEEMED ok. Voltage ok on all. Then actually took them out one by one. One was buggered but still reading ok. Replaced. Sorted. 1 Quote Link to comment Share on other sites More sharing options...
Ekona Posted January 22, 2017 Share Posted January 22, 2017 Might be worth sending the injectors away to be properly cleaned and flow tested, whilst you've got them out. 1 Quote Link to comment Share on other sites More sharing options...
RobPhoboS Posted January 22, 2017 Author Share Posted January 22, 2017 Thanks for the replies guys, it's been a disheartening weekend Although I'm getting pretty fast at stripping this stuff down now ! TT350: Did you pull the plugs or just disconnect the harness ? What was the sign that made you go - ah, found ya !!! And was it similar symptom whereby you'd get that little pop here and there and can hear it's not quite right ? My friend with an NSX said he swears its the coil packs when listening to it as had it a couple of times but once had to replace the 'main relay' (whatever that is) which caused similar problems. Not a bad idea Ekona, since I've probably got to take them out again, and it seems like it's around £75 to do them. Quote Link to comment Share on other sites More sharing options...
TT350 Posted January 23, 2017 Share Posted January 23, 2017 I didn't touch it personally. A few garages with the appropriate gear and diagnostic equipment tested it and passed it. I had it in at TDI north and they actually physicality inspected them. They found the culprit and showed me. It was about ready to snap and had some milky substance on it. Quote Link to comment Share on other sites More sharing options...
RobPhoboS Posted January 23, 2017 Author Share Posted January 23, 2017 Ah ok. When I get back in tonight I'm going to have to strip the top bit down again anyway, so I'll pull the plugs and the cam sensors. Once the proper sized (I hope) injector o rings appear, I'll then try the coil packs again just in case Quote Link to comment Share on other sites More sharing options...
RobPhoboS Posted January 23, 2017 Author Share Posted January 23, 2017 (edited) Right, I just about had time to pull the plugs, thank feck I got new thermals I did wipe the oil from the thread on cylinder 4, it was the same as the others. If anyone can read anything from this that would be hugely helpful but they all look pretty much the same to me. I put these in exactly 1 year ago. NEW PHOTOS ADDED Edited January 28, 2017 by RobPhoboS Quote Link to comment Share on other sites More sharing options...
RobPhoboS Posted January 24, 2017 Author Share Posted January 24, 2017 Aside from the oil (I need to add a bit of rtv to the top of the seal tube), how are they looking? Quote Link to comment Share on other sites More sharing options...
RobPhoboS Posted January 25, 2017 Author Share Posted January 25, 2017 I'm going to pull them, label them, get some clear photo's to help identify where some issues might be, and pop some other ones in for now. Quote Link to comment Share on other sites More sharing options...
RobPhoboS Posted January 28, 2017 Author Share Posted January 28, 2017 I thought I'd better take clearer images so here we go, I've replaced them now but kept these out to see if it gives any clues. Only cylinder 1 seems to have a little yellowing on the thingy. Quote Link to comment Share on other sites More sharing options...
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