Dear Doctor: I own a 2000 Acura TL with under 80,000 miles. The problem is a slight stumble under light acceleration, 25 to 40 mph with the engine at operating temperature. What could it be? Richard
Dear Richard: Any kind of stumble under light acceleration is usually a misfire. Weak ignition spark, a lean fuel mixture, or even a lazy ERG valve can cause a misfire. These can cause your problem without setting a “check engine” light. It is possible the computer could have a pending code in memory. The engine should have a performance test before replacing any parts.
Dear Doctor: I own a 1997 Lincoln Mark and the left headlight burned out. The replacement cost for this High-Intensity Discharge light is $1,600. My mechanic has had no luck in finding a cheaper solution. Any suggestions? Sue
Dear Sue: Your choices are to buy an aftermarket HID replacement, a used headlight assembly, or convert both headlights over to a conventional light system.
Dear Doctor: My 2005 Jeep Grand Cherokee V-6 has 39,000 miles on it. The dealer just installed the fourth starter under my extended warranty. I am tried of getting stuck with a no start condition. Is there an aftermarket company that makes a reliable starter for this engine? Bill
Dear Bill: I have not had any common trend with faulty starter motors on these vehicles. Common starter failures are mainly caused from low voltage at the starter and poor ground connections. I suggest having an independent ASE-certified technician check the connections, both positive and negative, as well the voltage at the starter motor. A battery voltage test should also be done.
Dear Doctor: The wipers on my 1997 Chevrolet Cavalier don’t go down. They work properly, but when I turn the wipers off they come back up on the window and stop there. How can I get them back down to the cowl of the windshield? Betty
Dear Betty: Wiper motors have a park position. Some GM vehicles have a park bracket that gets bent slightly and causes the wipers to stop at the top of the windshield. You will need to have this repaired by a qualified technician.
Dear Doctor: I own a 2006 Dodge Grand Caravan. When I start the minivan I hear a slight whining from the engine. When I’m driving on the highway for a period of time the whine gets louder at high speed. When I slow down to get off the highway the whining becomes worse. When I step on the gas the sound increases. What should I do?