Okay, I'll make a topic then

yellowpatrol · Post by **yellowpatrol** » Sat Sep 19, 2009 11:46 am

I've been trying to diagnose this on the side (figurative) in the chat box, but it's getting too complicated.

Car won't start.

Fuel: √
Spark: √
Battery: √

If I hold the throttle down while cranking the car will start but the second I let off the throttle it dies. Possible vac problem? What should I check?

sneakers O'toole · Post by **sneakers O'toole** » Sat Sep 19, 2009 12:13 pm

same thing happens to my car, only when it's damp though. there's also a distinct sucking sound coming from the throttle body/intake when it stalls as well. i figured it's something with the IAC. i also have a 1gen throttle plate, but i don't think that would matter...

yellowpatrol · Post by **yellowpatrol** » Sat Sep 19, 2009 12:16 pm

So yours is actually drivable though? Mine is ridiculous to the point that I can't drive the car at all regardless of the temperature.

yellowpatrol · Post by **yellowpatrol** » Sat Sep 19, 2009 12:36 pm

Fuuuuuuuckin weird.

I took the IAC motor off and put it back on and she works like a charm.

Weird ass car.

MyNeonSaysHi · Post by **MyNeonSaysHi** » Sat Sep 19, 2009 12:41 pm

SRT or the SXT?
Everything is dandy now?

yellowpatrol · Post by **yellowpatrol** » Sat Sep 19, 2009 12:43 pm

SXT. Yes everything is bizarrely dandy. I'm not going to poke around in there any more at the risk of breaking it again- lol!

Damnit and I was hoping it was something big so I'd have an excuse to swap the SRT motor in there!

Post by **racer12306** » Sat Sep 19, 2009 12:54 pm

Only think I can think of is that the IAC wasn't correct so that when you left off the throttle it was completely choking it off and causing it not to run. Therefore you didn't have air, a critical element.

sneakers O'toole · Post by **sneakers O'toole** » Sat Sep 19, 2009 1:30 pm

oh yeah, once i get it started it runs fine. getting it started is the trick haha.

silverneontuner · Post by **silverneontuner** » Sat Sep 19, 2009 7:20 pm

perhaps an intermittent fault with the skim. i had this problem at work

pyistazty · Post by **pyistazty** » Sun Sep 20, 2009 4:18 pm

where's the IAC motor at? i'm having the same issue and thinking this might help,but i dunno, but i do want to give it a shot.

Maddog · Post by **Maddog** » Sun Sep 20, 2009 7:12 pm

Low/bad battery can cause this same problem...did in my Jeep until it nearly drove me nuts. Asked a local mechanic, and he tested the battery - it was nearly toast. Not enough juice in it to operate the IAC on startup. After a new battery, it's never done it since.

Post by **occasional demons** » Sun Sep 20, 2009 7:39 pm

Maddog wrote:Low/bad battery can cause this same problem...did in my Jeep until it nearly drove me nuts. Asked a local mechanic, and he tested the battery - it was nearly toast. Not enough juice in it to operate the IAC on startup. After a new battery, it's never done it since.

Makes perfect sense. If you listen, you can hear it operate at key on. It opens, then adjusts down once it fires. You could unbolt it from the TB, and see if it does move when keyed on. 2000 models may operate differently.

pyistazty, it is the only aluminum thing on the outside, top of the TB.

pyistazty · Post by **pyistazty** » Sun Sep 20, 2009 8:14 pm

thanks broham

Post by **occasional demons** » Sun Sep 20, 2009 9:24 pm

That's Brougham to you! A nice 1969 New Yorker is preferred.

Adionik · Post by **Adionik** » Sun Sep 20, 2009 9:28 pm

Crank position sensor?

yellowpatrol · Post by **yellowpatrol** » Sun Sep 20, 2009 11:42 pm

Adionik wrote:Crank position sensor?

Aw yeah!

OB · Post by OB » Mon Sep 21, 2009 2:52 am

Definitely IAC. Mine did it for a spell too. I would have to open the throttle to keep it running. The IAC on these cars uses a solenoid that moves a plunger inside the housing. My guess is that the plunger gets stuck (probably from dirt buildup or a bad design) which then causes a no start/no idle problem. It operates in such a small range, (0-5V I assume) it creates a wear pattern. I took mine out one day and applied a full 12V to the solenoid and zapped it to full open. I deenergized it, reinstalled it, and it's been good ever since (5-6 months). All it needed was a little... stretch.

2001rt32 · Post by **2001rt32** » Mon Sep 21, 2009 5:16 am

map sensor too, when i did the clutch in my car i accidentaly messed it up putting the intake back on and it barely ran/started and if it did start sometimes it wasnt running too long.

yellowpatrol · Post by **yellowpatrol** » Mon Sep 21, 2009 12:08 pm

OB wrote:Definitely IAC. Mine did it for a spell too. I would have to open the throttle to keep it running. The IAC on these cars uses a solenoid that moves a plunger inside the housing. My guess is that the plunger gets stuck (probably from dirt buildup or a bad design) which then causes a no start/no idle problem. It operates in such a small range, (0-5V I assume) it creates a wear pattern. I took mine out one day and applied a full 12V to the solenoid and zapped it to full open. I deenergized it, reinstalled it, and it's been good ever since (5-6 months). All it needed was a little... stretch.

I didn't do all that, but while I had it off I manually moved it with my thumb

Post by **occasional demons** » Mon Sep 21, 2009 12:27 pm

Damn

I could never get my thumb in there.

yellowpatrol · Post by **yellowpatrol** » Mon Sep 21, 2009 12:30 pm

You know what they say!...

Post by **occasional demons** » Mon Sep 21, 2009 12:41 pm

I wasn't going there.

Maybe I'm having an off day.