After replacing fuel pump, electrical system, spark plugs, spark plug wires, ignition control module and coil, idle air control valve, engine oil pressure sensor, cleaned the master air flow sensor, my suburban starts well and runs for about 5-10 minutes and then splutters and cuts out. It will not restart unless I let it rest. Any ideas as to what could cause this and get me running again? Has been a very faithful machine. Any suggestions as to what I could focus on next?

 

What is the fuel pressure when it stalls? You can borrow a gage from most auto parts stores. Also what do you mean when you say you replaced the electrical system?

 

Thanks for your reply. The fuel pressure stays steady at 58 psi when it stalls. It doesn't change much between when the ignition is ON to when its idling. But its still cutting out after a few minutes of idling. It idles pretty smoothly while its running. When I throttle it, it runs fine. It just cuts off completely after a few minutes. Considering that this may be an electrical issue or some other sensor that's killing the engine.

Relating to the electrical system that I mentioned, I was just referring to the spark plugs and wires, in addition to the distributor and distributor cap, etc.

 

doralfinn Welcome to the forum...
What year model and engine do you have?
5-10 min could be about the same amount of time it takes the O2 sensors to go from open to closed loop...not saying this is the problem but something to consider...
Also are you starting the vehicle with a key or using a remote start, as many remote start features will only allow the vehicle to run a maximum of 10 or so minutes...

 

I would also check the crankshaft position sensor and the camshaft position sensor.

 

I really appreciate everyone's input in solving this problem. We changed the crankshaft position sensor today and guess what!?!?!? This baby just kept on running... So good, so far... Keeping the thumbs up. And a special thank you to jstnbrwn for hitting the nail on the head this time round! Keeping my fingers crossed at this point, hoping for the best... But with you guys in the background, it makes it so much easier. Until next time, thank you again...

 

Oh, in reply to your questions... I have a 1999 Chevy Suburban K2500 5.7L V8. And no, I don't have remote start unfortunately...