Ok so this has just recently started to happen and no nothing has been changed on the car right before this has started to happen.

If I start the car while it's cooled down it will run for a few secs then die but if I hold down the gas and let it idle at 2k for a few secs it has no problems after that. Also my RPM's love to stumble real low when I put any type of electrical load on the car...don't know if they are related. However I did read some other posts from searching about the fuel pressure solenoid going bad but that was on hot starts. Don't know if they would be the same.

Any suggestions? Thanks for any input.

 

I had something like that as well; start out and die sometimes, it was because a vacum line got unplugged. Did you happen to tug on any vacumn lines under the UIM? The ones with the check valves? I tugged on them before and one got lose and that gave me the dieing at start thing and it died at a stop light with ac on.... so i would check there first (doesn't hurt)

 

Hmm I almost forgot about vacuum lines but yes I shall check that out. Think an o2 sensor could do this if it's dead? I seriously think my o2 sensor is dead cause it runs rich on idle but the higher the RPM the leaner(much more correct A/F) it becomes. Just something I've been thinking.

 

I have the exact same problem. Everytime I start the car in the morning when it's stone cold, it will idle for at least 5 seconds then die. I've gotten to the point when I know it will die and just blip the throttle and it won't die. I also have problems of stalling when coming to a stop at operating temps.

 

im having a similar problem. i crank it, hear it start, stop turning the key then.. watch the rpm go up to around 1k for 1 sec and wind right back down to 0 like i shut it off.

 

Man it seems that having problems with the FD is a never ending occurance with our beautiful vehicles. It's like I tell everyone that tries to dis on FD's...Mazda focused on making a car that would scream down the streat and show up any car that is priced 60k plus higher then it and forgot all about the whole reliability part. That's alright in my book though cause when you have those Vette's and others that down know what's up pull up to you with their arrogant self and show them your taillights it all makes it worth wild.

 

Assuming it's stock and/or you still have everything in place, perhaps the idle solenoid. I doubt it's the O2 and depending on where a vac leak would be, I doubt it would be that too. What ECU do you have?

 

I highly doubt its the o2 sensor.

 

I'm currently on a stock ECU but if I pop in the Power FC I have the car still has problems but it acts completely different but that's probably because stand alones aren't designed to know how everything in your car is suppose to work. Is their a way to check solenoids without taking everything apart to get to them or is that the only way?

 

Is the check engine light on any of your cars?

 

you could adjust the screw under the uim because when my car was idling bad i got it adjusted and my rev kept just fine.

 

also might want to check at the boost sensor if that vac line is plugged in because that will make the car die also

 

yeah i had this problem on my fd any i adjusted the idle screw any now its idleing perfect.

 

I don't get a CEL and now my car doesn't die when I start it up for some reason...all I did was change my dashpot since the plunger was no good but that shouldn't have anything to do with why a car would die on start up. I wonder could having the sensor plug for the AWS plugged in but the hose from the elbow disabled cause any issues that would cause the car to idle real bad under load? I'f I move the steering wheel or apply brakes or even just roll up or down the windows my cars idle stumbles and the car shakes real bad. checked my TPS and all and can't find a dang thing wrong.