oldtimer10
New Member
- Joined
- Oct 21, 2008
94 Buick Lesabre 3.8 VIN L.
The symptoms are the following:
1. Car starts and idles as normal each and every time.
2. Upon RPM increase car stumbles and bumbles, no power at all.
3. Spark plug inspection reveals raw gas smell and light carbon buildup indicating fuel rich condition and/or weak spark.
4. Spark visual indicates weak spark voltage as indicated by yellowish spark (although this is inconclusive)
Symptom occurred overnight…Ok after long drive home, began first thing next morning.
ODB1 computer show no codes pertaining to engine.
Crank sensor is new.
Fuel pump and filter are new.
Plugs are new.
Intake manifold new 3 months ago.
Car and engine mechanicals in good order as car is well maintained.
Throttle Pos. Sensor checks OK.
fuel pressure checks OK.
fuel pressure regulator check OK.
All sensors and wiring pass visual inspection(although pin out voltage testing has not occurred)
Exhaust back pressure test. OK
Vacuum lines check OK
Have unplugged nearly all sensors as a test with no change.
That’s all I can think of for now. Have spent lots of time and money to no avail. If you have some ideas or would like to take a crack at this let me know.
Thank you,
The symptoms are the following:
1. Car starts and idles as normal each and every time.
2. Upon RPM increase car stumbles and bumbles, no power at all.
3. Spark plug inspection reveals raw gas smell and light carbon buildup indicating fuel rich condition and/or weak spark.
4. Spark visual indicates weak spark voltage as indicated by yellowish spark (although this is inconclusive)
Symptom occurred overnight…Ok after long drive home, began first thing next morning.
ODB1 computer show no codes pertaining to engine.
Crank sensor is new.
Fuel pump and filter are new.
Plugs are new.
Intake manifold new 3 months ago.
Car and engine mechanicals in good order as car is well maintained.
Throttle Pos. Sensor checks OK.
fuel pressure checks OK.
fuel pressure regulator check OK.
All sensors and wiring pass visual inspection(although pin out voltage testing has not occurred)
Exhaust back pressure test. OK
Vacuum lines check OK
Have unplugged nearly all sensors as a test with no change.
That’s all I can think of for now. Have spent lots of time and money to no avail. If you have some ideas or would like to take a crack at this let me know.
Thank you,
