I pulled the following dtc's: P0300/P0171/P0174/P0154.
The engine when cold will crank and start and go straight to about 2000 rpm's and then die about 2-3 seconds later. If this process is repeated 6-8 times, the engine will continue to run while misfiring and idling at about 2000. After a few minutes the rpm's will rise to about 3000 and during this time most of the misfiring will subside. Punching the gas pedal does nothing, but putting it in gear brings the idle down to about 900-1200. At operating temp. It seems to idle fine but when driven has no power on demand, pushing down hard on the pedal will cause the engine to choke and stall out but it wont die. Using light pressure on the pedal you can build up speed and get up to 70mph. At those speeds it drives smooth with an occasional jerk here and there along with the tach dropping or rising at the same time as feeling the jerk/stutter. Seems as if you push the pedal down more than 25%, it chokes out.
Should I be looking for an intake vacuum leak on the right side (bank 2) of the engine based on these codes or should I be testing the O2 sensor and its connections? I wanna say the sensor is not in play during open loop so the high rpm's are the cause of a vacuum leak but the P0154 (no activity bank 2, sensor 1) has me confused. Can a major vacuum leak cause an O2 sensor to put out a signal that is so far to one side of its value that it is seen by the ECM as no activity? Or is there possibly two problems here?
Thank you so much in advance!
have the same problem?
Friday, December 4th, 2009 AT 1:44 PM