I have a 1997 Saturn SL2, 1.9L, twin cam, A/T, 135k Mi.
The problem(s) are as follows:
Hard starting, once started, very erratic idle, frequent stalling. When the vehicle is in motion it runs fine except when you have to stop. When you stop, you have to "Pop" it up in "Neutral" and feather the Gas pedal just to keep it running, but when doing so, the "Tach" will jump up to about 4-5 k when in neutral. Once the vehicle reaches "Operating Temp" if you have to shut it off for whatever reason, you have to put the Gas Pedal all the way to the floor in order to re-start the engine. Although, at "Cruising" speeds.(40-65 mph.) The vehicle runs perfectly. Yes, the "Check engine" light does intermittently come on.
I have hooked the vehicle up to my OBDII scanner and here were the results:
1) O2 sensor voltage above acc. Limits. (Bank #1 sensor#2).
2) IAT sensor faulty.(Intake air temp).
3) Coolant temp. Sensor above temp reading.
4) #3 cyl. Spark plug voltage not registering.
I then went ahead and did a cyl. Comp. Test and the results were:
#1cyl.- 135 lbs.
#2cyl.- 145 lbs.
#3cyl.- 005 lbs. (At 4 different tries)
#4cyl.- 150 lbs.
And here were the condition of the plugs:
#1-Oil Soaked (not carboned)
#2-Fine, normal "carmel" colored
#3-Carbon fouled, but Gasoline Soaked
#4-Fine, normal "carmel" colored
Note: the plugs and wires have LESS than 50 mi. On them. And are installed correctly.
But what gets me is why the spark is NOT registering in #3 cyl. The "Coil Pack" was swapped out with another "Working" one, with the same results.
Could the Computer have a bad "Leg" in one of the sectors? Or, is it simply a, "Blown head Gasket"? These problems are Driving me NUTZ trying to properly diagnose them. ANY help from another Technition would be GREATLY appreciated!
have the same problem?
Thursday, February 16th, 2006 AT 9:18 AM