blackstallion666

i wouldn't go in that direction just yet. seems more like a sensor problem, but if you get your hands on a volt meter and check the power and ground to the tp sensor that will let you know if the pcm is at fault or if its a sensor concern.

timeformiller44

yeah

tbirdscwd

Did you try re-flashing the computer? Maybe the computer was dumping a bunch of fuel to compensate for the cams and to keep the car running. The PCM can "learn" adapt by developing long term fuel trims by averaging the short term trims. Basically if the computer needs to dump a lot of fuel to keep the A/F at 14.7 with those new cams it can save those settings as long term fuel trims. I think the car starts up it open loop, but the PCM can also apply these changes to open loop fuel functions.

oxfordgt

You got SCT racers edge don't you? I think I know what is wrong but inorder to fix it you have to change your tune. And no handheld is gonna be able to change what you need only sniper or racers edge.

You did check for vacum leaks right? and make surethat the vacum line is on the fuel preassure sensor?

timeformiller44

yes i made sure everything was on and good.. which it is..

i have the sct livewire and i tried with the stock tune and thru a quick canned tune on it... did the same thing either way

timeformiller44

bc you have to remember it WILLL fire up with alil fuel in the cylinders and the injectors unplugged.. so it WILL Run.. i just think a shotload of fuel is dumping in and i gotta find out why

jhell00

i never had that happen. check and make sure u got a connection at the tps make sure the wires are all the way into the plug and no corrosion on the terminals. in my 95 z-28 a wire fell out and it did that kinda

timeformiller44

lol but IT IS STARTING !!!!!!!!!!!!!!!!!! but not if injectors a plugged in... it cant be maf/tp sensor or that bc it woulndt start reguardless if injectors in or not bc they are always plugged in... it starts ONLY when injectors unplugged for a couple of seconds and then nothing when injectors ARE plugged in

blackstallion666

have you even tried unpluging the maf??? I understand what your trying to say.it starts and runs when the injectors are unplugged. so it couldn't be the maf or tp. But it still can be. by unplugging the injectors all your doing is stoping the flow of fuel allowing it to start. obviously something is telling the pcm it needs more fuelcuasing it to flood. Its doesn't hurt to atleast try unplugged the maf. Andsend the pcm into fail safe mode and see what happens.

timeformiller44

heres how it went down.
i have a $3000 scan tool so i know what im reading is right and i comepared to another 4.6

pulse width: PCM controlling injectors to open and close spec is 2-12 millaseconds. should be at 0 with key on engine off. about 3.4 engine idling and so on.

WELLL with my car...key on engine off im oh at 197.8 millaseconds..hence my injectors are WIDE open causing massive fuel dumpage into the cylinders hence not firing up

so thing is...my PCM controls this.. so it goes PCM telling injectors how much to open and when..so either a wiring issue or my PCM **** itself...

got the diag down for the most part now