Im trying 2 get my car ready for this summer so i went 2 my storage and start her up after a couple of months,first it cranked and did not started like usual(it took longer)but she did idle perfect!i let her warm up and pull her out and she died on me.started her up again and left the driveway down the road she started bucking like crazy and running lean so lean that she died on me,started her up only 2 see that she will idle perfect but if i tap my gas pedal or try 2 move her she will go so lean that the engine dies,went home swapped all my injectors and i still have the same problem even if i try 2 free rev the motor it will go lean and by lean i mean no gas at all. wideband is a aem unit working fine so i know is not a glitch.
microtech is firing all the injectors on test mode.
40ps1 fuel pressure at idle and holding pressure.
braided lines parallel sistem 720/1600 injector combo.
no errors on the microtech.
Any ideas?

 

coolant sensor reading what is supposed to ?

 

and check the TPS, if it's not reading any input the ECU may be trying to mix in the idle map.

internal map sensor may also not be reading and stuck, check those 3 figures.

 

Check all sensor reading and make sure they are around where they should be, iat,clt,tps,map...

 

okay checking everything now.

 

Okay with out starting the car just looking at my screen my map sensor reads zero,air temp 90,water 07c,air temp 90,mSec 11.33 st and tps is dead on and working

 

air temp at 90C? that's wrong..

 

okay karack!i have 2 go home and look into that!thanks!if that is true that my air temp is 90c could that be my problem?

 

92c plug in and -30 unpluged!could this be my problem?

 

could be ! my fd its seen 55c to 63c.

 

also make sure that map hose its connected to a good source of vacum, and that it isnt pinch or anything.

 

if you havnt figure it out. disconnect the coolant sensor and try it

 

look at your air temp correction maps, some tuners put failsafes into the maps to try and prevent popping a motor but it would be strange to try and pull fuel versus dump more in during an extreme heat soak condition..

does look like the temp sensor took a big dump.

 

likely the air temp issue is a calibration one,, many later LT ( s) type ecus will have the delco curve as default ( FD ) while some earlier machines are calibrated to the FC air temp sender,, and there is large discrepancies if mismatched
in that case the air correction maps should be zerod ,, or a correct sender fitted

my guess is on the MAP sensor hose being blown off or eaten through with rats , and sometimes even blocked with wasp eggs
( in oz the wasps love to lay in the charcoal can and vent lines )

however,, the lean issue could also be a blocked filter,, a faulty fuel pump or even fuel pump relay volts related
,,all very likely after a prolonged sit ..
you could try checking the volts at the pump
,, and then pinching the return line with the fuel pump jogged and seeing what head pressure the pump can achieve
( which is about the only home fuel pump test the average guy can achieve easily )

 

Map line is coming from my top small rear nipple on my FD intake mani.
Have 2 see if is blocked somewhere.
Swapping air temp out tomorrow for a delco unit.
Air map is all zeros(has always)
And i will disconnect the coolant temp tomorrow(im thinking of swapping a new unit 2)
Checking fuel pump and relays 2.

 

Okay i did swapped the coolant and air temp sensor,coolant is a stock unit and air temp is a gm.No change at all!air still reads 90c connected and -30c disconnected,next step is sourcing a 2gen air temp sensor and try that but i was running the car before without a air correction map so even if a sensor swap fix the reading im positive that it wont fix the problem
next on my list is swapping my aeromotive regulator for another unit and if that wont fix my issue im parting this sucker out!

 

I'm probably mistaken but is it any possibility it's the fuel filter?

 

he already checked the fuel pressure...

 

Swapped regulator and nothing
Next fuel filter.

 

what if you prime the injectors ? have u try that?

 

Prime the injectors?how?

 

May b gas went bad for the time it's been on storage ,may clogged your filter or injectors

 

i did swapped my injectors and it did not fix it

 

papa go to the settings and stuff i dnt remember the screen . i think it says config or something like it it has to be on 4cyl so put it to 0cyl for a couple of seconds. you will hear the injectors clicking. that will dump some fuel in it if you have the fuel pump on . the put it back on 4cyl and try again. this happend to me a while ago. give me a call if you want

 

Test mode!they do work