Originally Posted by
subject47
Could be three things, bad news is that the three things are important, Air, Fuel, or spark.
ok how long did it take for the problem to start. this is important, while the engine is cold it runs a preprogrammed fuel map... it runs rich (good thing). once it warms up it starts to take readings of the fuel air mixture using the o2 sensors, then adjusts for the correct afm.
if it warmed up and came off the fuel map and tried to put the correct fuel in but could not it can run like this.
did you notice black smoke out the back?
the same goes for ignition timing, if the timing is off i.e. bad crank sensor the truck can run like ***, I get the same thing on my 89 bmw if the crank position sensor gets wet. runs just like that backfires dies and takes for ever to restart.
the air intake can also be premmaped untill the engine warms.
the two differrent modes are called closed/open loop, i forget which is which atm.
since you have cleaned the MAF and i assume have no air blockage since it was running, I think we can out the Air problem to the side for now.
I would start with the spark side first, checking over the whole system overview style, looking for bad conections, lingering water then do the same with fuel.
drive the truck till warm see if it happens again.
If it does, check the entire ignition system, pull off each coil one at a time look for water pull each plug look for cracked ceramic on the plugs, look at each plug they should be dry, kinda brown/metal color with minimal soot, carbon build up. if you find one that is not you may have found a symptom of your problem. soot is caused by too much fuel not burning correctly.
I really want to say its a problem with timing on the ignition side. I would say the crank sensor appears to be working.
How deep was the water inside the truck? the ecu is only inches above the tranny tunnel
Reply With Quote