Weak Ignition Spark Stalls Engine
My 1991 Dodge Dakota with a 5.7-liter engine stalled a block from my home. With the help of a few neighbors, we pushed the truck into my driveway. My truck has 146,000 miles on it. Four years ago, I had to replace the engine because a piece of metal punctured the oil pan and the engine seized.
P.F., via email.
Dr Gizmo says...
You must be frustrated. You mentioned key clues. The spark plugs are wet and there is spark. However, this raises a question. How strong is the spark to the spark plugs? If it is weak, it will not jump the gap across the spark plugs.
There is one part you have not replaced or checked. Test the ignition coil. Its possible for it to deliver a shot of electricity that is not strong enough to fire the cylinders. Replacement might end all of your woes.
Light No Longer Shines In Radio
Hello Dr. Gizmo. The lights inside the radio in my 2002 Pontiac Bonneville have slowly failed. Now all the lights are out and my radio is dark.
Years ago, I replaced the bulbs in a radio. Can I replace the bulbs inside this radio?
Dr Gizmo says...
It has been at least a couple of decades since radios had replaceable bulbs. It would next to impossible for you to replace the lights in your newer solid-state radio without the proper tools and equipment.
To illuminate your radio consider sending it to a repair shop, replacing it with an aftermarket unit or consider purchasing a used original equipment radio from an auto recycler.
Suspicion Raised Over Diagnosis
My 1999 Oldsmobile Cutlass with a 3.1-liter V-6 engine is at a repair shop. The car quit while driving on the highway. The state police suggested that I tow the car to a repair shop near the highway. I have never been to the shop before. Its about 25 miles from my home. The shop manager seems nice and the shop appears very nice, clean and modern.
The car has been there for three days. Today the shop manager called to tell me that the engine has bent valves. He said that he has not disassembled the engine. He wants my permission to remove the cylinder heads. I spoke with a mechanic at my local shop near my home about the trouble. He said he has never heard of such a problem in a car like mine.
Is the shop that is working on my car trying to rip me off?
Dr Gizmo says...
I understand your concern. I have been in the auto business for more years than I care to admit. I learned a long time ago that nothing is impossible. This is true in your case. Some engines are prone to bend valves. The engine in your car is not known for having such a problem but under the right conditions, valves can bend in any engine.
Call the repair shop manager and ask him to explain why he thinks the valves are bent. If he says that the compression in a cylinder or two is zero and that air is blowing out of the engine through the intake system, he has strong evidence that valves are bent.
Be prepared for an expensive repair. It might be time to say goodbye to this car.
Thanks for all of your great questions. Dr. Gizmo cant wait to answer more.
Phil Arendt is a columnist, consultant and A.S.E.-Certified Master Technician. Readers may send questions to Dr. Gizmo at P.O. Box 548, Cary, IL. 60013 or e-mail address email@example.com. ® DR. GIZMO © 1989-2009