350 tuned port injection problems again

[burnskustomz]

ok i had the vacuum line unhooked while the motor was running when i hook it up it dies on me anybody no what the problem is? i surely dont and any help will be greatly appreciated

[johnracer]

Which vacuum line? If you have large vacuum line unhooked, say brake booster for an example, and hook it back up quickly, the idle air control valve may not be able to react quick enough to keep it running. Will it idle if you start the engine with the vacuum line hooked up? If not, you may have a bad or stuck IAC valve. It's really just a computer controlled vacuum leak.....
Johnny

[burnskustomz]

ok i'll try to crank it with the vacuum line hooked back up but i dont know alot about these fuel injected ones but the vacuum line i am referring to goes from the throttle body and connects into a little black ball thingy idk what it is but the engine is in an 81 chevy silverado it used to be in a 1988 formula firebird and it wont run rite now and i have til next school year to get it running or i'll be riding the bus and theres noway im doing that again this year lol

[mopar1968]

You have to reset the ''Idle Air Control'' motor again :!: get someone to start the engine keep it around 1500 rpm, hook up the vacum line and slowly let it come to Idle again you may have to repeat this if you let it die out, try to keep it running so the computer can reset :!: :!:



''JUST MY TWO CENT'S WORTH''

[burnskustomz]

ok thanx mopar will do also the MAF is off and that is also helping it run better do you no why.

[mopar1968]

Do you mean MAP sensor?

[burnskustomz]

No the Mass Air Flow sensor but i have heard ppl talking about the MAP sensor what exactly is that?

[mopar1968]

Manifold Air Pressure, air flow thru intake, it monitors vacum in intake to regulate fuel mixture along with 02 sensors, Mass Air Flow monitors in coming air flow to engine, if the engine runs better with it off then it is faulty, If it run's good and no check engine lamp just leave it off.

[burnskustomz]

it runs good with it on or off and the check engine light is on wether or not its on or off

[gnsrule]

Leave the MAF sensor on. It tells the puter how much air is going into the engine and witht the o2, rpm and other inputs it tells the puter how to fuel and idle it. Get yourself a scan tool and LEARN whats going on if you wanna hot rod it....unless daddys got deep pockets.

Good Luck

Craig

[burnskustomz]

naw my dad ain t got deep pockets at all lmao but he did just finish welding skool so maybe he will soon lol but can u get a scan tool with OBD1 i thought they only made 1 for ODB2 but i'll check into one and maybe i will have it running better now and mopar what you told me helped but i think i mite need a thermostat i think its running a lil warmer than i want it to its a lil over 210 and when it ran good i usually ran around 180 but yea i'll try to get me one of those scan tools Craig and back to talking about the deep pockets i have to pay for everything just about it my dad mite pay for the cheaper parts every once in a blue moon lol :lol: :lol:

[MEMRACING62]

obd 1 you can read codes without a scanner. you need a jumper wire or a code key. jump the diagnostic terminal in the data link and count light flashes. get yourself a book at pimp boys , it will tell you how to do this.

[burnskustomz]

pimp boys wheres that at? and how much does the book cost?

[mopar1968]

Pep boy's, Summit racing has them along with scanner's.

[burnskustomz]

oh ok i thought it mite be pep boys but not sure if there was actually a pimp boys never no what names ppl can come up with :lol:

[MEMRACING62]

oh ok i thought it mite be pep boys but not sure if there was actually a pimp boys never no what names ppl can come up with :lol: we have worse names for them, but this is a clean forum. kinda thought you would figure it out.. :P

[burnskustomz]

oh haha well i didn't know never been to a pep boys i live in MS don't even no where ones at lol :lol: :lol: :lol: :lol:

[MEMRACING62]

what you have there isn't to hard to figure out once you read the codes. But, before you replace any parts go over every ground conection in the engine compartment make sure there all clean tight EVERY ONE OF THEM. part swaping can get expensive just to find out you just had a bad ground.