i really need help with my GM, it starts up but dies out quickly.

[talon2nr7588]

ok im having trouble getting my car to run, it just starts up but will die out. i have ruled out the fuel pump,relay,filter,IAC valve since i just changed them all.. so my last guess is that its a ecu problem. it just happened one morning and it was running fine the day before

i bought one of these scanners http://www.actron.com/product_detail.php?pid=16298. to hook up to my car since i cant get it to run. i hooked it up and turned the key to ON. and there are no DTC's but

when i looked up th I/Ms it came up with 5 that were incomplete. they were catalyst,evap,o2 sensor, o2 heater, and the EGR.
what exactly do these mean?

could it be the crank position sensor or the throttle position sensor?

[Local Boy]

I would look at the primary circuit in the ignition...

Stupid question...but is the MAF connected? Check the connector....

Good luck...

ALOHA

[talon2nr7588]

you mean where the key goes? what does it look like? and do i just take off the steering column?

yup maf is connected.

[Georges93LX]

When it starts can you give it a little gas and keep it running? It still sounds lik an IAC problem.

[talon2nr7588]

nope even if i give it some gas it cuts off. and i changed the iac with a brand new one.

[RoyLPita]

Does the theft light on the top of the dash flash? Does the key still have the chip in it?

[Blackened300a]

I just recently had 2 keys cut for my crown victoria and I had no idea that a 99 ford had a PATS system in it. I tried to start the car and it would fire up then stall then just turn over til I put the original key in the ignition and then it started fine.
Wasnt there a thread that keys can be blanked by magnets or something like that?

Whats the red LED light on top of the dash doing when you attempt to start??

[captain]

I checked the repair manual and learned it could be a LOT of things. Something as simple as pressing the reset fuel button in the trunk to missing spark patterns. I also learned that the tech guy really needs to interview you. ie how does it run when it runs?(fuel or electrical) did you refuel with engine running? (evap) Like I said its a big question. best of luck and keep asking this board...somebody has had this happen also.

[red]

o2 sensor, o2 heater
If the car's dying immediately, I doubt it's anything to do with the HEGOs as the car's in open loop operation on cold start. The problem could be a vacuum issue.

[Blk Mamba]

I took off my air intake, while painting the COP's covers, and tried to move the car, same problem you are experiencing, a vacuum leak, as was said earlier is a good guess.

[Rocknthehawk]

I had the same issue with my ranger...the fuel pump wasn't staying on. I replaced the iac and it ran fine, and now i't's doing it all over again