Abdullah

iTrader: (2)

i have 2000 M6 Z28 and it hesitates some times and this is more obviuos when at WOT. i just cleaned the injectors and made a complete tune up replaced spark plug wires. the Z still hesitates even after the tune up. is there a way to know if the injectos are working properly or not? what is the way if so and can it tell me exactly which injector is not working? like autotap becuase i can't mod the car further until i find out why it hesitates and solve this problem. need help, i'm with this problem since i bought the car about 5 months ago and i can't figure out what is the problem.

thanks.

Abdullah

iTrader: (2)

how to diagnose injectors in my 2000 M6 Z28? i want to know if they are working properly or not. do i need to use autotap or something alike. thanks.

Abdullah

iTrader: (2)

how can i know that i have bad fuel injectors that are not working properly in my 2000 M6 Z28?

is there a certain procedure to check for or to diagnose bad fuel injectors?

thanks for help

txhorns281

iTrader: (12)

are you getting misfires or something? If that's the case then isolate which cylinder(s) you are having problems with and switch out one of your good ones for the bad one to see if the problem will move from cylinder to cylinder. Otherwise, if you know a good deal about your tune, and you know you're commanding fairly rich and producing much leaner than expected, that could be a sign of fuel related problems. But in that case, I'm not sure how to tell which injector is at fault, or if they're the main culprit

Abdullah

iTrader: (2)

txhorns281, i don't have missfire ( no DTC codes for misfire) but the car is surging or bucking while driving and it is ( the surging or bucking ) more obvious when pressing on the gas pedal.

txhorns281

iTrader: (12)

Vaccuum leak maybe??? Are you scanning with any program? Anything look unusual?

Abdullah

iTrader: (2)

txhorns281, my friend tryed to diagnose the car with AutoTap but he didn't find any thing. he told me once you have the SES light let me know. btw at that time when my friend autotapped the car i disabled the rear O2 sensors, AIR and EGR but that didn't solve the problem.

i'm not sure if i have a vacuum leak. what hoses to check for vacuum leak?

P Mack

iTrader: (6)

Had you recently done any work when the problem started? Are your ltft's different on one side?

Abdullah

iTrader: (2)

P Mack, the problem was with the car since i bought it used.

what is ltft?

P Mack

iTrader: (6)

Long term fuel trims. You should be able to log them with autotap.

Phate

iTrader: (2)

You can use a Tech 2 to pulse the injectors one injector at a time. Basically what you do is look for one that does not drop fuel pressure when it is pulsed...or drops WAY too much.

M_T_0

I think that HP tuners and others have the cylinder by cylinder test, I forget what it is called and I dont have my laptop in front of me.


More Than Zero

jimmyblue

iTrader: (11)

If you can't see it in current-misfires then it's probably
not an injector.

If there are live O2s in this car then watch them for an
idea about mixture and whether the stumble coincides
with an over-lean / stuck-lean condition. Use ATAP for
general diagnosis. Check that the MAF is unmolested,
check the fuel trims and knock retard where it stumbles.