My father'* Oldsmobile is acting up again. Pretty much the same symptons as in this past February:
We changed the PCM back then and it worked fine until now (actually it worked until he has to drive thru a foot of water). Houston is known for flooding because we are too flat down here, the rain water can't run off fast enough. The check engine light came on shortly after he drove thru the water, and afterwards:
1. Check engine light will come on randomly while driving.
2. Car stalls occacionally while cruising (three chimes and three lights on the left IP).
3. Car sputters at take off (not sure if this starts happening before/after the flood water. I will ask dad).
So at first, I thought it'* the PCM, went back to the store and got a replacement unit and swapped the PCM. But problem still exisits. Went to Oreilly'* auto parts, and they have AutoXray 2000 that can read the hybrid PCM, and got the code out to be - P1406 EGR pintle position. Cleaned the EGR valve with GUMOUT, not much carbon deposit there in the first place. Check Engine light still comes on randomly (according to FSM, if EGR signal is out of range twice in 20 seconds, it will cause the check engine light to come on).
Any idea? BTW, plugs and wires were changed about a year ago, car is at 153,000 miles. Thanks in advance for all the inputs.