CAT3

iTrader: (9)

Is there a way to use HPT to check to see if an Injector is hung open or something? I have went thru the tunes, PCM Swap, Coil Swap, Wires, Plugs, MAF, TB already no positive results. Last thing I can think of is Fuel Pump psi (getting a gauge today to check rail pressure, but looking at the plugs, its running rich as can be!) and Injectors, its kind of a PITA to swap individual injectors or ever rails itself. So if there is a test or something I can do with HPT I appreeciate it.
Charlie

jimmyblue

iTrader: (11)

Log all 8 current misfire PIDs and you should see a
bad injector plain as day, by a grossly different
count from the rest. A drooler, more at idle and a
starved one, up top.

WS6FirebirdTA00

iTrader: (33)

hmmm maybe this will help me in seeing some tuning issues with my larger injectors, if i have an injector causing a problem it should throw something for a cyl?

CAT3

iTrader: (9)

Guess I'd have to change the misfire tables back in the tune then to see them! Ugh. Figure.

Brains

iTrader: (7)

I think HPTuners has the cylinder balance test implemented in the bi-di controls, right? I ran that on my GTO with EFILive to see what it does, it cuts each injector one by one and measures the RPM drop. If the RPM is lower on any certain cylinder, you can start looking there.

CAT3

iTrader: (9)

Yep, thats the reply I got from HPT Forum, only problem is getting it to hold an idle, even with the BiDir. Idle at 1200 it has a hard time. Might be easier for me to swap out the rails and injectors first to see if there is any difference. I have a couple set around somewhere. Ugh. I hate troubleshooting.

Thanks though guys.

jimmyblue

iTrader: (11)

No, not the misfire tables, that just pertains to the
setting of codes. You want the current misfire rolling
count, real time.

CAT3

iTrader: (9)

so even if the misfire is adjusted for a large cam (changed tables 32767 to 32000 etc using old skool tuning guidance with Edit) the count will still work? What else needs to be scanned? RPM. ECT?????

Tiger2o69

iTrader: (16)

ttt.....

02sierraz71_5.3

iTrader: (2)

Ive got b1 running alot leaner uptop around (100 mv) and think its an injector, I bought the ones Im using used from someone on the truck board. Ive swapped 02's and still the same run cleaner through the intake and lots of cleaner in the gas with no help. B1 is always leaner even at part throttle. I did the cylinder balance test and you have to hold your foot on the throttle at an rpm below 2500 then do the test to keep it running, the results where inconclusive all cyclinders seemed to be within a couple percent of each other I did it several times.

Im gonna log misfires counts and we'll see. I have the same problem as you just the opposite, I run lean on one side always. I guess it could be that rail too. This is really getting irritating, I cant get my wot fueling right until this is solved.

WS6FirebirdTA00

iTrader: (33)

my bank 1 is about 3% leaner than bank 2 at idle, i wonder if its involved with o2s. have you guys checked with a WB or no? im going to try and switch my o2s over and see if thats the error, i ahve brand new o2s and brand new injectors...

02sierraz71_5.3

iTrader: (2)

I wish mine was only 3% my b1 will show 850 and b2 will show 950 thats a huge difference and its causing kr, I have to raise pe to keep out of kr and then b2 gets so rich. My wot tuning is impossible Im ******* irritated this is what I get for buying used crap off people I dont know on the internet.

CAT3

iTrader: (9)

hey man, I am by no means a pro tuner, but I have been learning a hella lot. I might be able to help you, if you want...email all the info, detailed to cat3n4@gmail.com

Charlie

02sierraz71_5.3

iTrader: (2)

I know its an injector on b1 its just narrowing it down, Im seriously considering sending em out to get all 8 flowed and cleaned seems like a worthwhile 100 bucks

here is the link with a graph post https://ls1tech.com/forums/showthrea...88#post3447188

Matt@HSW

iTrader: (14)

You still should see it. All you did is change when the PCM triggers a SES light. All the data is still coming in.

Matt

CAT3

iTrader: (9)

Matt, sorry for not updating... I figured out a set of PIDs to look at the misfires real time. Thanks.

02sierraz...do you have HP Tuners? If so, you should be able to look at the misfires, and see the suspect injector/cylinder.

02sierraz71_5.3

iTrader: (2)

I tried logging misfires today and got all 0000000000000000000000

this is with a tweaked mid and low rpm table though. Are you guys getting misfire data with tweaked tables?

ZL1Killa

iTrader: (17)

its probably a lot of work but for those of us that have done it a lot it really takes no time. Take off your fuel rail with injectors, grab you a pressurized air tank or something and rig up some lines so that you are connected to the fuel rail and use 12V with a positive and neg leads and test each injector to see if it is flowing. DO NOT USE A LOT OF PRESSURE from the pressurized tank...meaning don't open up the nozzle all the way; if you do you will see your injector(s) fly across the room or if your outside see them shoot across your yard.... You will be able to hear the injector hiss at you once you supply the 12V to each one. That is if you even want to do this...lol

I bought new injectors and we had to take the rail and everything off to solve my multiple/random cylinder misfire. ended up it was an injector that wasn't opening.

CAT3

iTrader: (9)

I have logged misfires with my car and I modded the misfire table heavily. Odd, at the least.
Sierraz....Have you tried swapping side on the O2's? Also try swapping the injectors in the rails from side to side? No exhaust leaks correct, nothing within a couple feet of any' O2 that is?

RedHardSupra

iTrader: (1)

swap the 'suspect' injector to the other side, see if the trim imbalance follows along