95 Buick OBD1 130,000 miles stalls with no trouble codes?

usecom · Posted at Mon Mar 26, 2007 12:39 pm

I have a 95 Buick Roadmaster with 130,000 miles 5.7 ltr v-8 / LT1 I replaced the Opti,coil wires,plugs,altenator,water pump about 2 years ago and I have regular oil changes including a recent fuel filter change. Tranny filter and flush coolant flush all within the past year.

The car stalls usually in Park at idle or in drive at stop light. It acts like the idle is low or to low and then it stalls. Restarts with no problems. Idle RPM is 575 to 500 RPM.It also stutters and shudders off the line and is made worse if I gear down.

I have a XRay 6000 and I have cleared a code in history related to the MAF and it keeps coming back in history but not current codes.

The exhaust sound is vey rough ,kinda a puh puh puh sound, but listening to just the engine; it is running smooth.

Totally lost but I have taken it to 2 mechanics and got it needs a new Opti and the other said new Cats and and O2 sensors and I talked to another and he suggested a speed sensor or the IAC valve may need replaced.

Any idea on where to start?

Advertisment · Posted at Mon Mar 26, 2007 12:39 pm

donaldp · Posted at Tue Sep 25, 2007 2:29 pm

usecom wrote:

I have a 95 Buick Roadmaster with 130,000 miles 5.7 ltr v-8 / LT1 I replaced the Opti,coil wires,plugs,altenator,water pump about 2 years ago and I have regular oil changes including a recent fuel filter change. Tranny filter and flush coolant flush all within the past year.

The car stalls usually in Park at idle or in drive at stop light. It acts like the idle is low or to low and then it stalls. Restarts with no problems. Idle RPM is 575 to 500 RPM.It also stutters and shudders off the line and is made worse if I gear down.

I have a XRay 6000 and I have cleared a code in history related to the MAF and it keeps coming back in history but not current codes.

The exhaust sound is vey rough ,kinda a puh puh puh sound, but listening to just the engine; it is running smooth.

Totally lost but I have taken it to 2 mechanics and got it needs a new Opti and the other said new Cats and and O2 sensors and I talked to another and he suggested a speed sensor or the IAC valve may need replaced.

Any idea on where to start?