5.7L Ford engine problem

Venturing a wild guess I would suspect the IAC valve. It is positioned on the throttle body and connected to (probably) a two pin connector. It might not be opening after initial startup to allow air into the intake for the idle to hold. Take it off and clean it up with some carb cleaner first, cheap and easy, just be careful with the gasket. Could also be the circuit controlling the IAC. There are loads of posts about cleaning IAC valves in this group, also worth googling. A new IAC valve might run you anywhere $50 to $75.

lmfao I A C if he reved it would run TARD

the first thing that comes to my mind is WANNABEE

lmfao what a lode of shit

start with basics do u have spark when it dies?

hurc ast

And where did shammydog say he could rev the motor? Go back and read the OP he says it cuts out after 1-2 seconds, barely enough time to step on the accelerator and have the engine respond.

It takes ten minutes or less to remove and clean the IAC. I guess they forgot to tell you at idiot school that AIR, like spark, IS a BASIC component of the combustion triangle.

So you're the expert...???

Sure... you still can't explain your assertion that a bad intake gasket will cause an INTERMITTENT vacuum leak. You've had a few weeks to think about it but not surprisingly can't come up with anything.

Duh-uh

lmfao every one of your diagnosis begins with IAC

do you change the iac when you change tires too

btw 1-2 secs is about enough time to put foot on gas a natural instinct when engine is about to fail too hey that opens up the butterfly valve

so much for your IAC theory LMFAO

u think ya know IAC lmfao the dwell of an IAC is 21 degrees what is the duty cyle??

hurc ast

He types???

I'm sure it is just a monkey with a keyboard, no actual cognitive thought or typing involved. If absolutely NOBODY replied to this IDIOT he would stop bothering us all...

look whos the idiot cant even follow your own advice

BWHAHAHAHAHAHA

foctard

hurc ast

First of all, an IAC technically does not have a dwell. But I know what you mean . You connect a dwell meter to the IAC and read the dwell on the meter, and convert that to duty cycle.

Now comes the point. Nobody can answer that question to your satisfaction because you failed to mention which scale you are reading

- 3, 4, 5, 6, or 8 cyl. So anybody's answer will be wrong, and you'll be off on another rabid rant. On a 6 cyl dwell scale, 60 degrees is 100% duty cycle.30 degrees is

50% 3 degrees is 5 percent. 21/3=7. 7 times 5=35% On an eight cyl dwell scale, 45 degrees is 100% 15 degrees is 33.3% 3 degrees is 33.3/5= 6.66% 7X6.66= 46.6% On a 4 cyl scale, 90 degrees is 100%, so 21 degrees is 23.3% On a 3 cyl, 120 degrees is 100%, so 21 degrees is 17.5% On a 5 cyl scale, 72 degrees is 100% 36 degrees is 50% 3 degrees= 50/12= aprox 4.167 percent, and 21 degrees is 7X 4.167 0r 29.167 percent.

And any tech checking the iac will have a codescanner handy (not just a code reader, but a real scanner - the ones the techs won't let the lub-jockeys and tirebusters touch) that will read out the requested AIC position, the actual position, and if applicable, the pulse width or duty cycle.

wrong

100% is 360 degrees in this case since there is but 1 event why bring cyclinder ? this is irrellivant dwell on 8 cylinder is diffrent than a 6 because of 2 xtra events which happen in a distributor than spins 360 degreess

lmfao codescanner to read pids

lmfao u go girl

hurc ast

Just a common point of failure on many Ford engines. Worth ruling out the simple, stupid stuff before investing time & money into poking and hoping, especially if your fixing it yourself.

bullshit

hurc ast

Because um... IAC valves never get gummed up, dirty or uhm... fail. Riiiight

many fords have original iac in uncleaned condition

lmfao hutc ast

Whatever you say. If there is only one event there is no duty cycle.

What dwell meter do you use that does not differentiate between engines with different numbers of cyls? Like I said - NOBODY can answer your questions with an answer you can accept as correct, because you are a know-it-all, smart assed wannabe. One I wouldn't let within a mile of my vehicle, most definitely not my Ford!!

Must be me then...