91banditt2

iTrader: (1)

1991 5.7 700R4 Firebird
ok here's the run down the motor dosen't want to rev.every time i bring it up above idel it dies.
all of the gaskets on the intake are brand new.even the gaskets on the TB.all vac.lines are also new.using the stock 305 MAP sensor
i'm running about 40 psi at the fuel rail(AFPR)with 22lbs stock injectors
i've adjusted the TPS to .5 VDC at WOT the voltage reads over 4. VDC.i also had the TPS tested twice
i've got new plugs,new Accell 8.8 wires,new Accell hi out put coil,MSD 6A,new Accell cap and rotor,new spark module
i'm running a 94 LT1 cam w/Crane Cams 1.6 RR's
stock SD ECM and PROM w/VATS removed
new O2 sensor,new knock sensor,all of the temp sensors are new

what i'm looking for is ideas what i should look for
any and all comments

91banditt2

iTrader: (1)

4 veiws no posts?come one people
help a bruda out!

leirch

I would set the Fuel Pressure back to stock 47PSI. Start from that, are you getting any codes? What is new on the injection system? timing set correctly?

I could meet up with you some time and we could compare notes, I'm from Lima.

Brendan

rezinn

After it dies does it have trouble starting? I'd also raise the fuel pressure up to around 46psi. Maybe try disconnecting the msd box to rule out one thing.

CALIROCZ28

iTrader: (3)

When you did the conversion did you change the fuel pump in the tank. The TBI fuel pump will not work with your TPI. You must install one for a TPI.

91banditt2

iTrader: (1)

i have a brand new 255 Walpro pump in her
no problem starting it back up after it dies.other than the battery dieing,a portable charger cures that
nothing is really new in the intake except the gaskets.
46-47psi is that with the vacume source removed and pluged or is that with it on the AFPR?
i never had any problems with the MSD box when it was a LO3.buuuut it did sit for 8 months

thanks for the input keep it coming

91banditt2

iTrader: (1)

JKIF
(just keepin it fresh)

91banditt2

iTrader: (1)

need help here!!

the car starts up like a champ and idles but it will not rev above idle.
i don't think it's a vacume problem.every gasket on the intake is brand new.i sprayed water all over the intake to see if i get a change in idle(vac. leak)no change in idle.if dosen't idle high as if it had a vac. leak but it acts like it has a major leak.

tonight i'm going to rise the fuel pressure and readjust the RR's

91banditt2

iTrader: (1)

i bumped up the fuel pressure to 46psi and put in a different TPS.as i was adjusting my TPS voltage i noticed a faint hum coming from the intake.
it was coming from the IAC motor.it must be stuck open,creating a vacume leak i have to wait untill monday to get a replacement.

91banditt2

iTrader: (1)

well the IAC wasn't the problem.i'm going to focus my attention to MSD box and Accell coil my going to by pass these two and see hook a stock coil and see what bolws up.

my this close to rippin the FI **** out put a ****in carb on it

ChrisFormula355

BWAHAHAHAHAHA........sorry couldn't resist from your last post.....Mrt89rs here in Tucson has been busting his knuckles trying to get his TPI running for a week and he was having the SAME EXACT problem as you......would idle fine, but crap out when revved. Guess what...........he gave up and is going carb tomorow! Tell us if you figure out what was wrong, cuz we haven't over here in Tucson for Mike either

91banditt2

iTrader: (1)

can you go through what all you've done with your TPI conversion?

mrt89rs

91banditt2, boy o boy o boy,

man i am putting a carb on my car asap. I would like to keep my tpi on but my rs is my only car man. that thing has not been able to run at all for three weeks. I got it running fine after two weeks and then i took it to chrisformula355's house and it never ran agian and still hasn't. that was almost two weeks ago. this coming monday will be a month since i sarted my tpi swap and i am still undicided if i want to get rid of my tpi setup (somebody is offering me 400 bucks for it) i worked so hard to get that thing going and have spent so much money tring to get that thing running it was just nickel and diming me to broke and now i have been taking the city bus for the last month and having to bum rides when ever i can. i am all out of money tell next friday when i get payed and had to barrow money for a couple of things here and there that i will have to pay back to my parents and i am still clue less to what could be wrong with my tpi setup. so now i know i can put a carb on it and it will run with an a couple of hours not weeks and if i get an other car that i can drive around i just might put it back on and see what the f was wrong with it. will dude if you ever find out what the hell was wrong with that thing let me know. tell then good luke

mrt89rs

oh yea dude sorry

well it would be alot esayer to tell you what i didn't do to my tpi converson and that would be new tps, iac, o2 sencer, and knock sencer. I have put new fuel pump, maf brun off relays, new maf(that was out of my own stuiped mistake sticking my finger in the damn thing ) fuel presure regulater, gaskets, new screws for the runners and and intake. i had the same problem you have except that it was slowly getting worst. when at frist i had the problem i was able to turn my car on and it would idle fine then i would go to drive it and i would get like a block away and the dam thing would die on me. I jus thought it would be a srew or something but the more and more stuff i kept putting into my car it just got worse and worse, tell the poit that i gave up. the funny thing is that chrissformula355 lives like ten miles away form me and it drove over there fine and now it wont make it out of the apartments.

Well if you want my advise
if that is your only sorse of transportation then put a carb on it but if you have an other car then kep working on it. there are only so many things it could be and you have most of them coverd. I would if you already haven't check to see that your maf burn off relay works and that the constent hot wire (should be an orange wire coming strate form the battery) has some kind of in line fuse on it(25amp thats what i think it was). Then i would change my fuel filter I dont' relly know if that would help any but i was going to change the one on my car and was broke so never did. Make sure that all wires are plugged in all the way and that none of the pluges are worn out in any kind of way. In my car i was albe to tell that it was getting to much fuel and not enuff air so that is why i think i have some kind of fuel air mixter, but the autoxray was telling me that the car was running lean and thats why it was adding more fuel. but i never could figure out why it was doing that. my injector pulse kept shutiong through the room after x amount of time running. i was able to drop it when i fixed all kinds of air licks but it still did the same thing.

Let me know what happens after doing all that. Good luck to you

mrt89rs

one more thing i just thought of last night,

Does your fuel tank have any presure in it? Does it take several cranks to get your car started in the morining and then after that it starts right back up with out a problem? IF you answered yes to these ?'s and you have a new fuel pump, good fuel presure, and a gas tank with no licks in it then you just might have an injector problem. THat is the only thing i can think of that could actualy be wrong with our cars. synapsis had simuler problems with his car just not as bad and could never figuer it out so he took it to a shop and they told hem it was his injectors.
teast to see if your injectors have any licks on them or that they are not working properly i really think this is the problem.

ZZsmpch

iTrader: (1)

Idles fine, then takes a **** eh? EGR sticking?

91banditt2

iTrader: (1)

<---brand new EGR

ZZsmpch

iTrader: (1)

EGR solenoid?

91banditt2

iTrader: (1)

well i drove my car around the block last night
my problem was the MAP sensor wasn't getting enough vacume.i put a 91 plenum on and a new MAP.the 90-92 plenums have a third "nipple" for the MAP vacume source.besides a real bad header leak she felt real strong

TBI305Camaro

so its running now?????

91banditt2

iTrader: (1)