The CEL illuminates when something is affecting emmisions. Codes may still be stored if a fault is detected. It may shed light. It might not have any, On an intermittant issue, any clue can be helpful.
The intermittants can be tough.
Does this happen only cold as in when the truck is first started and put into gear to pull out of a driveway?
Does it happen on level surfaces or on an incline?
There are things that need a scanner to check, like the throttle position sensor, when talking a bout a stall situation. But for results to be accurate, there are prefaces that need to be right. Such as the the thermostat operating properly, the throttle bore to be clean etc.
You can check for overdue maintenance that may or may not be related such as plugs, intake and throttle bore cleaning etc. That can be a weak link.
You can have someone turn the wheels hard while you look for anything that is shifting/moving such as a wiring harness that may have been rubbing on a component and grounding out causing the stall, Any vacuum lines that are getting too taunt or moving in a position that opens a leak.
The more you can identify criteria of when this happens the beter you can try to narrow down the source.
Friday, April 18th, 2008 AT 5:04 AM