Truck just dies
Hey guys new to this forum. I have a 2001 1500 5.3 and when im driving it it dies. it acts like there is a small surge of power then dies and it wont start back up until you let if cool down foe a couple min. anybody have any ideas im stummped by it. it also has a EVAC problem could it be related. any tips would help out alot thanks
First step is to scan for codes. Do you have a way to scan it? If not take it to Auto Zone and they will scan it for free.
no codes showed up when it was scanned
Check the basics, Fuel, Spark, Air.
Fuel: While someone is turning the key to start, have someone else spray starting fluid into the throttle body. If you get a response, then this is a fuel problem.
Spark: Remove a spark plug and place the side screw portion against a piece of body metal or engine metal (grounded to battery negative/ground). Then watch as someone turns the key to start. See if there is spark. Advanced spark testing is to use a spark testing tool which would typically have a gap of .25 inch. You should see a crisp blue spark. This is a larger gap than a spark plug and tests that the coil is producing a high enough voltage. (Good spark as opposed to weak spark.)
Air: Slightly press on the accelerator while trying to start. Normally the throttle is completely closed and the IAC (Idle Air Control) valve adjusts to admit air into the engine. By pressing slightly on the accelerator, you are bypassing the IAC valve and allowing air to enter the engine.
Combination test: While someone slightly presses on the accelerator and turns the key to start, have someone else spray starting fluid into the throttle body.