How to avoid staying too rich at idle: Minimum Injector Pulse Width
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- เผยแพร่เมื่อ 1 พ.ค. 2017
- This video will show you what do do when you don't have injector data but your vehicle is idling way too rich.
0:25 One of the setting in Fuel Injector data that usually causes a problem
0:41 Problem you buy bigger injectors without data
1:00 Let's look at how to fix the problem using HP Tuners VCM editor
1:25 Minimum Injector Pulse width equals...
1:45 When you get a larger injector you get...
1:58 When you purchase injectors without data you are creating a problem for yourself and your tuner
2:45 Let's look at this in a scan using our HP Tuners Scanner
3:20 As you can see in this scan without good injector data this file is off 43% cumulative
3:55 The solution to this problem is simple...
4:15 Obvious solution is put the correct injector data in the editor
5:05 We normally don't go below this setting....
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This has been the best explanation yet for injector minimum pulse width. Excellent video!
Thank you. Just learning to tune.
I Modified my CAM 228/230 112LS , injector 26# to 50# , bigger cathedral intake and throttle body 75mm to 102MM.
Basically, huge changes and a hell of a first time tune.
Injector data from Deatschwerks was way to rich for my c5 corvette idle, not their fault just my inexperience.
Got it setup for SD with MAFS, LTFT and STFT disabled running open loop for just getting the idle tuned.
But I was as low as 3 for some of my idle values in my VE table ( no effect on Wideband it was - - - on my AEM gauge greater than 2 lambda and just worse idle).
Was getting frustrated then this video . Thanks, got my stuff straight now.
Thanks again, this stuff is 6 years old but relevant.
Always great content. Keep it up guys and thank you!
Awesome info 👍
Self taught novice tuners here! Just wanna say thanks!
Good info!
Great bit of info guys big thumbs up 👍, keep up the great work
This is gold info. I cant find this setting on the AEM Infinity. Been searching for hours.
Ok so don’t buy injectors with out data. Gotcha!! Lol thanks guys
this may help me on my Bosch 210s thanks
I needed this info.
Glad it helped!
I love you.
Thank you so much guys, I just replaced injectors yesterday and this was very helpfull
Glad it helped you out! Thanks for watching!
I have F.A.S.T. 65lb injectors. As I am sure many people found out after they bought them, there is no official data for them. It's believed that the FAST injectors are just rebranded Deatschwerks, who does provide injector data. I am using their data, which has a .729 Min Inj Pulse width which does create that rich at idle condition. I can't get the o2's to switch nicely at idle and light cruise. I played with Proportional Idle and O2 Rich/Lean vs Airflow to no avail. O2's compared to wideband Lambda was showing me 700-825mv, so this seems highly likely that this will help. I will test and report back.
This makes sense as to why I'm running stupid rich until going into closed loop. My terminator x has my injectors in their "list" of injectors.. but I've tried everything to get my afr around 14 cold idle, but its down around 9.6 which is obviously way too rich. I'm going to give this a try, and see what happens.
Thanks for watching, and let us know how it turns out!
Make sure you don't have any cold start enrichment tables or anything like that coming into affect. I have't looked at a newer Holley as of yet but there are probably a few enrichment tables that come into effect during and shortly after cold starts.
Would you consider a 48 lb injector "big" for it to need to be dropped down to .350? I'm asking because my car carbon fouls the plugs as soon as I start it up..I believe it's running way rich at idle from something commanding it to do so. Either bad o2s providing bad feedback or from bad injector data (I believe). Also running tr6 plugs in a NA car, have some tr55s I'm going to throw in to help it. (ls1 car if that helps ). Any feedback would be greatly appreciated. Keep up the vids, very informative 👌🏼
Would I be able to use this method to add fuel? Seems that im running lean in the lower rpm range.
My ID850's IPW is set .125 are set from the data from ID. My idle injector pw is 1.3 at idle, but if i slightly crack the throttle, the pw drops to .8 or so....what gives? AFR stays the same. closed loop.
Does minimum injector pulse width apply to decel fuel cutoff?
Can we change accords fuel injector with smaller ones like 1000 cc car can i save fuel or not
I Have some Siemens deka 60# injectors . What’s a good starting point with these? Just installed them and way too rich at idle.
Do you know what is the minimum (idle) duty cycle in percentage for 33 pounds per hour TBI injectors?
I set it to 7% but it doesn't want to sustain idle nor acceleration.
Anyone able to help me with my ID1300X Injectors on my 2JZ-GTE Supra? I want the car to idle as factory, but they are running at 1% Duty Cycle on Pump fuel, and really need someone who is experienced to help. My tuner had no idea and pretty much just did a power run and didn't touch the idle. Would really appreciate some remote help, happy to pay someone for their time.
As all get out. A term from my old neighborhood. 👍
So I have a question I just installed new 42 LB injectors and I'm having this issue I feel. The injectors came with data and the min pulse width is .805 could I lower it and see if it helps? Thanks in advance
Were your injectors stable at less than .805ms
wish you'd do more ford vids :( would be fuckin sweet if you did aussie ford vids specifically lol. do any of the ford courses you are teaching in Australia cover any of the aussie strategies?
I added FLEX FUEL INJECTORS to my ls 5.3 the pcm is 0411 that came with truck that had FFV but I installed a 60 psi intank pump and later learned FF injector only need like 54psi fuel pressure will the hp tuner work out this situation?
All GM LS V8 fuel systems are designed to be operated at 58 psi (or 3 bar) of fuel pressure. That includes your FFV injectors. The important part is that you accurately carry over the injector data from a tune in a FFV to your 0411 ECU. The tables will not be identical so this won’t be and easy task. I highly recommend getting some of our course material (if you haven’t already) for a more detailed explanation of the fuel injector tables. With our materials, you also get access to our technical support staff to help you get the tune setup correctly.
TheTuningSchool I just purchased the MPVI2 so I’ll get some data from that and see what is going on
Is it common that once you come to a stop in traffic, to run around 13.0afr from about 30 seconds to a minute before it rises back to 14.7afr?
No really. Might want to check your injector data and wideband working correctly first. Then check your MAF.
Afraid to plug in the data!?
EDIT: as an aside, I see (or smell, rather) a lot of large-cammed LS cars on the street with stinky rich idles. Is this the most likely culprit or is it a vacuum issue?
kickblake it’s usually an injector timing issue.
i was running lean and had a misfire, so i upped the min pulsewidth and it fixed the problem. but now when i start the car up it goes really lean for a few seconds and the corrects itself
Hello, I have the same problem. My truck has a new injector that has 17.1 ohms of resistance compared to the others with 15.8 to 15.7 and my truck runs rich at idle with a p0206 injector circuit malfunction. I've took it to the repair shop and they said the checked the wiring and it checked out so, they had me replace my computor but, the problem still persisted so I've been stuck on ends. This could be the solution I've been searching for. Did you have the same check engine light with your vehical by any chance?
3:13... why is ignition timing oscillating like that?
Ditto. Looks acceptable at 8-11* but every second you'll see it jump to 23* ? Wondering if this is the result of noise in one of the ignition sensors.
"fuel droplet"??. If your injectors are delivering fuel as a DROPLET... your injectors are too big... or they're just garbage.
what if your injector dead time is 1.7ms ???
Then your injectors are too big.
what do you mean "dead time" ?