I have a 01 GC Laredo with the inline 6. The motor turns right over and starts, runs for about ten seconds and shuts down. Turn it over and it starts and runs again. When it is running before shutdown I have absolutely no gages either. So I dont think it is a timing or spark problem and at least some fuel is in the line to get it going. I have brand new plugs and a coil rail and the old plugs that came out had normal wear on them so i dont think its there either. Ive read that if the pcm and other sensors are not working correctly it wouldnt even crank. So I guess my question or ?s would be anybody else have an issue similar and whats the fix or could it possibly be a relay? stuck egr? Thanks for your thoughts
Josh

 

Have you pulled any code from the ECU?

 

I am going to try bit with the truck not staying running long enough I'm not sure I can at all.

 

UPDATE; I have pulled a code off the computer that is showingP1686-no skim bus messages. Now I know the skim is the key system that sends a signal to the ecm that is vehichle specific, so I erased the codes and the truck started and ran. All guages back on no idiot lights nada, five minutes later no guages and all idiot lights including skim back on-TRUCK STAYS RUNNING. Shut down the engine and it starts right back up w no guages all idiot lights lit and STAYS RUNNING! Did that about five times with the same result, start, run, no nada on the cluster. SO....ECM? SKIM BUS and/or KEY?

 

I think you probably have an ECM problem, or the chip in the instrument panel is bad

 

Start small and keep it simple. Disconnect your battery, negative post first (good opportunity to connect charger). Get a can of electric/electronic parts cleaner then disconnect the ECM connectors, spray & dry each connector, align, reconnect gently/firmly and do the start/run/road test. I went through this...you have my sympathies.