Driving on the interstate when 1999 Suburban engine died. No warnings... was running fine and just died. Has nearly 400K miles. 5.7L, automatic, C1500.

It cranks but does even try to fire up. Here’s the other details right now:

-security light comes on when key it turned on, then light goes off
-spraying starting fluid in has zero effect
-no codes
-fuel pressure 60-65psi
-replaced distributor cap and rotor
-replaced coil
-replaced ignition control module

Any recommendations? Thanks so much.

 

It's a much older car to compare to, but my '68 El camino 327 did the same thing years ago when the timing chain slipped. Acted just like turning off the key. New gear & chains and away it went for another 100k. Hibernating in my garage for now!

 

If the cranking rhythm sounds normal I would not expect a timing chain problem. Adding starting fluid and fuel pressure at that reading tells me the fuel pump and fuel delivery are ok. You are on the right track with the spark problem though.

I would expect the problem is one of these, especially if when you remove the crank sensor, you see that it is rubbing on the end. Follow instructions when installing a new one.

https://www.rockauto.com/en/moreinfo...52988&jsn=1672 or this https://www.rockauto.com/en/moreinfo...52988&jsn=1688

Also, check to make sure the wires from the pickup coil that plug into the module, are intact. Been known to break or somehow get insulation to rub or flake off and short inside the distributor.

 

check ECM 1 fuse - under hood fuse box.... Injectors.

 

Ok, I will bite, where did you spray the starting fluid? If you went right down the throat of the throttle body that would bypass the injectors and show if the engine is reacting to fuel intake.

 

Got it fixed - turned out to be a bad Crankshaft Position Sensor. It fell apart as I removed it. Truck is now running again - thank you everyone!

Also, to answer a recent question, I had sprayed starting fluid down the throat of the throttle body during troubleshooting.

Thanks again - Walter

 

Glad it is fixed. Thanks for closing out the thread with news of a fix. If I recall correctly there are shims supplied with the crank sensor. If they did come with the new sensor, what shim did you use?

 

Good for you on figuring out your problem.
IMO...If that's the OE motor and has 400K miles, it would seem to be a gamble every time you drive it...