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Chevrolet Impala Catalytic Converter
This started yesterday on the freeway. It won't go over 35 mph or 3500 rpm in any of the four forward gears, even with the accelerator floored. I don't know about reverse gear.
When in 2nd gear, if you floor the accelerator, it will get up to 35 mph and 3500 rpm, and the Check Engine Light will blink on and off. When you slow down, the Check Engine Light goes off and stays off.
When in 3rd gear or drive, it still won't go over 35 mph or 3500 rpm, but the Check Engine Light does not come on.
If I'm in 3rd gear and shift down to 2nd gear, it's a hard shift. That is, you can feel the tranny engage hard.
Sometimes the car will buck when you try to reach 35 mph / 3500 rpm.
I took the car to my regular (non-dealer) mechanic. He said he put the scanner on it, and nothing showed up. I don't know if he drove the car and reproduced the 35mph/3500rpm/blinking Check Engine Light symptom while the scanner was connected (I forgot to ask). Since I gave him a good descrition of the problem, I doubt that he test drove it.
He told me that since he didn't get a code from the scanner, he called the local Chevy dealer for help. The Chevy dealer told him that it 'sounded' like the engine computer, and to bring the car to them.
I don't own an OBD2 scanner, so I can't diagnose myself, and even if I did, it sounds like a dealer repair. But, I'd like to be armed with more information before taking to the dealer, since I don't even trust the dealer to do much more than replace parts until it's fixed.
By the way, if I were to purchase and OBD2 reader or scanner, can I connect a scanner (or reader) to the vehicle while driving the vehicle to capture the codes/specs when the problem occurs? Would the less expensive reader do, or must I purchase the more expensive scanner? I'm afraid that even if I get the information, such as voltage, pressure, etc., off a reader/scanner, I still won't know what to do with this Chevy, and I'm destined to take it to the dealer and will be at their mercy.
I haven't been to a dealer for years, because my normal mechanic is quite good. I just dread going to a dealer, not particularly because of cost, but because of hassles and stress, and not doing the job right the first time.
Thank you very much.