Hi all, Injector upgrade to 550cc Denso today, along with other maintenance. Updated nistune injector sizing but car is still acting as if its running 370cc injector tune. There is obvious fuel clouds from exhaust which smells like 100% fuel. I was speaking with Chris (ezzupturbo) but we didn't manage to get very far. One bank is running a lot richer than the other as I have just noticed cyl 1 has no spark. If one bank is running that rich will the ECU add fuel so the other bank matches it? Exhaust sides are currently per turbo setup, i.e one pipe for each turbo, and both are equally dumping fuel vapour. I ran out of daylight and ideas, as soon as I get time I will fixing no spark cyl 1. The new injectors were bought from a forum member with approx 1000kms on them. All sound to be functioning properly and there isn't quite enough fuel to warrant a stuck injector, gave them all a wack anyway. Re-loaded stock tune with higher injector sizing to make sure the previous loaded map wasn't incorrect. All advice appreciated.
Did you flow test them before install ? If one of your cylinders has no spark you risk washing your bores and grenading your engine . Don't run it until you sort your spark issue . Also change your oil if there is fuel leakage ! Off the shelf tunes won't work with denso injectors
Negative on the flow-test, was hoping being so new they would be in manufacturing range. Thanks for heads up, I will be getting spark sorted asap, thanks for the heads up. What is the reasoning behind this? Why are they different to other injectors that should just require a resize in the ecu?
If you're literally flooding that cylinder with fuel it won't fire. I did the same, had pure vaporized fuel coming out the exhaust from one cylinder as somehow I had shorted the injector driver so it stayed open in the ECU when I changed the injectors. Caused one hell of a fire. Anyways. Strip it back out and double check your install and put in new o-rings and insulators. I say insulators as well as they don't like too much disassembly, and last thing you want to do is fix your fuel issue and then have a monster air leak to go back and do it all again. Peace of mind you can get them flow tested, not expensive. Once that's all done then it's electrical / ECU in nature.
Injector resizing only gives a ''ball park figure''..... just enough to get the car running. You will then have to make adjustments to fuel trim to get it running properly, especially when changing injector brand/style because of latency alteration. First, fix #1 cylinder spark. This is the reason you have one bank running richer than the other, you are throwing unburnt fuel into the exhaust The ecu can not fuel each bank independently, ALL injectors get treated the same. Next ensure you are using the correct latency for your injectors and if you're still throwing fuel out the exhaust, start leaning it out to get your AFR's closer to Stoich Note : If you don't have a WB, I would keep adjustments to an absolute minimum if you value your motor Also, the best tuning tool you can have is education. Read, read and re-read everything on the Nistune web page and you'll have a better understanding . . . .
He has NO spark on #1 ........ He didn't say he had a miss, he said he had no spark. This is clearly an electrical issue and needs to be fixed before he can start looking at any fuel mixture issues . . . . .
Awesome guys, thanks for all the replies and help, when I get a free moment I will get straight onto this and let you all know what happened for future reference. I did lube it all up well but I will remove plenum to check as I'll be chasing my tail otherwise. There is a chance #1 wasn't firing as it was soaked and I was doing this at 9PM, so testing was minimal. I will get it sorted most likely on Saturday when I have some time, I just wanted to rub everyone's heads together to gather any/all ideas with your experience. Seller has confirmed they were all working perfectly which I don't believe to be dishonest. It will end up being user error here. lol
You're right. No ones just assumed a miss-fire is caused from no spark, and no plug has ever soaked through to never fire again from a shot injector or seal, and a single cylinder with no spark always cause clouds of fuel. Never mind me.
He obviously has multiple problems ....... after his injector upgrade, but you should always start with the easiest job first. Testing for spark is the simplest job in the world, so that should be done before you go pulling the plenum looking for some other possible malady. If he confirms the lack of spark, then that can be rectified before using Nistune to rectify his mixture problem. I'd hate to see him pulling the plenum (again) when his problem may be a lack of spark and a drastic overfuelling due to incorrect k value and/or incorrect injector latency. Note that he has fitted Denso/Sard/PE injectors, and they have massively different k value/latency numbers to your Nismo injectors (basic Nistune injector resizing is based around the Nismo style of injector)
Plenum is coming off Saturday lol. All sparks are fine. cylinder will die shortly after start. Assuming pinched O-ring, causing De-atomisation of fuel and soaking of the plug stopping spark. The injector on that cylinder sounds to be operating correctly and the fuel is not so bad that it is pouring from exhaust, so pinched O-ring is the most likely. Looks like issue will be resolved by this (hopefully) which will just be user error. Which I prefer over parts failure. :rofl: Thanks for all the suggestions and help, tend to jump on forums early to get all possible ideas.
Finished work, got outside, re-pulled plenum. All injectors visually seem fine, pulled from rail to confirm no o-rings pinched or harmed, re-lubed and re-installed. Swapped cyl 1 and 2 to trace any problem injectors. Individually fed 12v to these to confirm working. Re-assembled to no avail. Cyl 1 and 2 soaked and not combusting, although all elements are there, i.e spark and fuel. All cylinders are running extremely rich, so. Still maintaining no codes and nothing physically wrong. Tomorrow will be new plugs, and then playing with the injector sizing. The plugs are pretty bad which should get all 6 running again, and then obviously go from there depending on condition. All lower mounting o-rings are sealed and all insulators are new condition.
So after all this, I pulled apart again and decided to plumb up the fuel lines again through the rail. There ended up being an intermittent leak between s1>s2 adapter and rail. The o-ring was rubbery and flexible as it should, so I don't really know why it was leaking. Fixed this and got everything back together with some new plugs, got it idling well and have been tinkering for the last two days. Bit of research now to get it perfect, need to adjust fuel cut on decel as the popping is a bit excessive and soon off to the tuner. Thanks for all the help and suggestions and reading my nonsense while I freak out about stuff not working.
