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Jim, ASE Certified Technician
Category: Car
Satisfied Customers: 1179
Experience:  California smog licensed, ASE ceritied in L1, A6, A8 for over 30 years professionally
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2002 Oldsmobile Silhouette: acceleration..rpms..exhaust..mechanics

Customer Question

2002 Oldsmobile Silhouette has had MAF sensor replaced twice, and still has stagger acceleration, episodically not able to get any speed, with RPMs vacillating between 800 and 1500--hicoughing and decelerating spontaneously, with exploding exhaust. Each time, the mechanics test drive the car, sometimes for 14-20 miles, and say "guaranteed, it's fixed." Then, either the day we try to pull away from the auto shop, or a couple days later, the same problems start again. It's getting dangerous to drive. When it starts it's hesitation and vibration, if you take your foot off the accelerator, about 50% of the time, it coasts smoothely, other times, it continues to decelerate. HELP.
Submitted: 6 years ago.
Category: Car
Expert:  Jim replied 6 years ago.
Is the check engine light or service engine soon light on when this problem is happening.
Customer: replied 6 years ago.




Expert:  Jim replied 6 years ago.
If the MAF was replaced twice, and it was bad the check engine light shoul have came on. So do you know why they replaced this sensor?
Customer: replied 6 years ago.

They had a snap on computer reader. They determined through this that the sensor was bad. The first replacement was allegedly "defective."


Expert:  Jim replied 6 years ago.
Based on the descriptions of your problems, I would have the crankshaft position sensor tested. It is the most likely sensor to be causing these problems. However; the conditions that your vehicle is experiencing should be causing the check engine light to come on.