1994 suburban starts then stalls out
 

My wife's 94 suburban , 211,000k, 4wd runs great most of the time,,,about twice per week with no warning it will start then quickly stall out,,it will do this about 4 times before it will finally start and run good. I have changed the cap,rotor, plugs and fuel filter. I also found lots of white carbon on the coil terminal. Plug wires look good. I have tried jiggling the ignition swith while it is running to see if it will stall it out,,it won't. After it did it again today I changed the ignition module, fuel pump relay and cleaned a dirty positive battery terminal. I can't think of any other problems at this point to check???? Can anybody out there offer me any suggestions?????? Any help will be greatly appreciated. Thanks Dave (confused in Texas)

RE: 1994 suburban starts then stalls out
 

fuel pump?

RE: 1994 suburban starts then stalls out
 

I thought about fuel pump, but since it is only an intermitent problem like once every 4-5 days I didn't think it would be the fuel pump. Have you heard of a fuel pump failing only once in awhile? Thanks Dave

RE: 1994 suburban starts then stalls out
 

Does it do this when cold start or when it's hot soak start or both ?

RE: 1994 suburban starts then stalls out
 

It only does it after my wife has driven it around town for a couple of trips. It has never done it when it is first starting up after sitting for a good while. Thanks Dave.

RE: 1994 suburban starts then stalls out
 

Forgot to mention, I changed out the ignition switch down by the firewall this week as well,,,it did not fix the problem. I was thinking of maybe changing the lock cylinder as well, just in case it is binding up the rod??????

RE: 1994 suburban starts then stalls out
 

When it dies, does all the electrical go out with it, or is it just the engine that dies, leaving all the dash indicator lights still on?

RE: 1994 suburban starts then stalls out
 

It only does it on hot soak ...it may very well be the fuel pressure regulator.

RE: 1994 suburban starts then stalls out
 

I doubt this is the case since you say it never happens at first (cold) start.

RE: 1994 suburban starts then stalls out
 

I don't know for sure about all of the dash indicator lights still on. It did not stall yesterday during our trips around town. It did finally shoot a code. It was number 35 which the book says is the idle air control valve. I bought a new IAC yesterday and will be installing it today. I am thinking that maybe this could be the problem,,,,I think the IAC sends a signal to the ecm and maybe with a bac IAC the signal doesn't get to the ecm sometimes?

RE: 1994 suburban starts then stalls out
 

Still fighting with this issue,,,,,,have now changed the ignition lock cylinder to go along with all the other parts. Suburban runs fine,,,but about every other day it will start then quickly stall,,,it will start and stall about 2-4 times before it will stay running fine. I have gotten another code (number 35) IAC valve again,,,,,I have put a new one it so not sure what is going on. I also wiggled numerous wires while it is running to see if I can locate a loose connection. I am stumped at this time,,,,parts I have changed are: dist cap, rotor, ignition module, fuel filter, fuel pump relay, oil pressure switch, plugs, ignition switch and lock cylinder.
Golfer I finally have an answer to your question of the dash lights being on when it stalls,,,,they are not on when it stalls??? not sure what this means? Does anybody think it could be something in the run circuit that loses power when key is realeased just after it starts?
Pleas offer any suggestions I am at a loss at this point, Thanks Dave

RE: 1994 suburban starts then stalls out
 

Ok lets review...

- when the vehicle first starts ( cold ) it runs fine and doesn't stall.

- After it's been running a while ( hot ) it stalls and hard to start.

- when it does stall there are no lights lit on the dash

.... is this correct so far?

When it does stall and the radio isplaying will it go off ?

RE: 1994 suburban starts then stalls out
 

It really could be a fuel pump. Sometimes they will run fine for a long or short time and then just quit pumping. Turning the key off and on a couple of times until you hear it running again will get it started again, and then it will run for a while just fine before it quits again. Seems like after sitting overnight or for several hours,it runs good for a while before it starts acting up.

RE: 1994 suburban starts then stalls out
 

Golfer,,,it has since stall out twice when it is first started in the morning????? It stalls out so fast after it starts that I am not sure about the radio.
A funny thing about this suburban, I have never been able to hear the fuel pump running, I have owned it for about 6 weeks now, I think I bought somebodys headache. With my limited knowledge I am thinking its maybe fuel pump or something in the ecm not giving a signal sometimes after it starts? Do you think I am heading in the right direction?
Thanks Dave

RE: 1994 suburban starts then stalls out
 

Let's never mind about an electrical problem and I doubt it's the ECM.
The engine needs three things for it to start and run...
1 - air
2 - fuel
3 - spark

You can try having someone turn the key to "on" for the count of 5. During this time you're outside the vehicle listening for the hum from the fuel pump.

There is a magnetic pickup and an ignition module inside the distributor that the ECM reads to control the timing of the spark and the injectors.

You could also have a problem with the fuel pressure regulator.

1994 suburban has issues when you dont let it warm it up?
 

This morning I started it fine and ran for about 10 minutes, then took the kids to school. This was about 7 am, at around 10:50 I went out and started it, but only let run for a minute or two then left. The truck sputters and dies repeatedly. The only way to keep it going is continually tapping the gas pedal. Any ideas on what might be going on?

Sounds like you have the same thing I do. I'll let you know when the dudes reply to my thread, haha.

I have this exact same issue, except I have a 95.

Has anyone solved this issue?