96z28_lt1

wow thanks for the good info injuneer, i replaced fuel filter already so i don't know....i was going off of what my chilton said says to check circuits back to pcm for continuity, i don't know i'm at a loss for what can really be wrong could compression cause affects like this, compression test and stuff are waiting till tomorrow though for i had other things to take care of thats just what i got to go out and look at so far

96z28_lt1

fuel pressure test today was slightly funky, first few trys it only went up to about 30psi and then dropped instantly after i bypassed everything and kept the fuel pump on it held pressure when i took it off the prime, not sure if thats normal

also got a live scanner on it and got a couple readings in crank attemps

map 23.9
ign adv stayed around -11 to -9 for most the time but sometime fluxuated to as far as +3
short term and long term fuel trims constantly stayed 0
o2s11 read .350
o2s12 read .445 even though it isn't plugged in?
o2s21 read .930
o2s22 read .445 even though that also isn't plugged in

that might all be normal i don't really know how to read live data yet would love to learn if anyone has insight?

Injuneer

The PCM applies about 0.45 Volts to the O2 sensor. The sensor raises or lowers that voltage based on exhaust gas O2 content. If there is no sensor attached, the PCM is reporting it's own bias voltage.

What did the fuel pressure read when you "bypassed everything"? I'm assuming you mean you bypassed the fuel pump relay by using the fuel pump prime connector. If you had higher pressure in bypass mode there is a chance you have excessive voltage drop in the part of the system you are bypassing. Check the voltage at the fuel pump harness connector near the rear axle, with the pump powered normally, not bypassed.

96z28_lt1

Yes injuneer thats what i meant by bypass i forgot that it was called the fuel pump prime connector, it held around the 43.5 and stayed there while the pump was on i then disconnected it to see if it would drop but thats when it finally stayed and held pressure after that tryed a few times again, let out the pressure with the pressure release and then try again. I will try this again tomorrow and also check the connector at the rear of the vehicle, any idea what i'm suppose to check, how many volts what connectors and all that info. But even with the fuel pump prime connector hooked up i still couldn't get the car to start so i think this might just be another issue.... Thanks for the help though

Injuneer

You need 12V at the rear connector. Measure voltage from the gray wire to ground. The engine has to be running, or you will only get 12V to the connector for about 2 seconds after turning the key to "run".

Courtesy of Shoebox.

http://shbox.com/1/fuel_pump_connector.jpg

If you have less than 12V, try it again using the prime connector. If you get significantly higher voltage through the prime connector, the components between the fuse and the relay are suspect.

96z28_lt1

i will check on that in a little bit but fuel pressure is normal with prime connector and without it, only differences is with prime connector the fuel pressure stays about the same as were normally it drops to around 30 with key on, can't really get the car to start either way or idle so i might have someone crank for me while i try and get the reading off the harness

96z28_lt1

draining oil now, it has a lot of fuel in it i'm not sure if its from the bigger injectors i had in it or maybe my fuel pressure regulator is bad and i just can't catch it dropping fuel. I haven't found any evidence of fuel coming out of it so i'm not sure

96z28_lt1

also got a video of the reader today has it struggled to stay alive around 400 some rpms

i feel like the MAP sensor level is kind of high if what i read is right i'm about 6000ft above elevation where i'm at yet

96z28_lt1

[autostream]http://autostream.com/camaroz28/?page_type=firebirdplayerthumbnail&framepage=2624& transactionid=1335998542-7421142229&posted_by=96z28_lt1_www.camaroz28.com&y outube_video_id=fjAveH88Ux0[/autostream]

96z28_lt1

anyone?

Guest47904

You're making this way to complicated. You were told to look at certain items to see if they were the source of the flooding. Have you looked at them?

And now that you've managed to soup some cylinders, I highly suggest you check compression. Obviously with the injectors off and the throttle wide open.

96z28_lt1

was going too today, i have a compression test here, i checked the injectors they werent leaking and looked at the fuel pressure regulator for leaks also which were not present from there either. I thought if the map sensor was reading as high as it is it would tell the computer to add more fuel. I was gonna check for voltage were i was told to but have no one to crank the car for me at the moment last night.