Engine Performance problem
1995 Buick Riviera 6 cyl Front Wheel Drive Automatic 168000 miles
I have a 95' Riviera with a supercharger. The supercharger has been replaced, it has had all new plugs, wires and three new coils. I have had the transmission serviced and have oil changed regularly and add fuel additive every other tank. When drive I feel a vibration and with my experiece I feel it is a combustion issue. After a few minutes driving the check engine light comes on and it is to the point that I can tell when it will happen (usually once I reach 40 MPH and then let off the throttle). The testing device says the check engine light is emmission related and could be one of three things; the EGR valve, the O2 sensor or an electronic fuel sensor. This car is running better than ever and I even get 24 MPG but this rough idle vibration is driving me nuts. One other note; sometimes when I start the car back up after only sitting a few minutes, it has a toughtime staying running so I have to do a power brake take off until it straightens out in a few seconds. Do these symtoms suggest a bad EGR?
have the same problem?
Wednesday, October 15th, 2008 AT 8:44 AM