Question about 2007 Chevrolet Cobalt Coupe

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My 2007 cobalt won't start-displays ''Engine Power Reduced''...what's wrong with it?

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The computer has detected a fault in the emissions system that could damage the engine. It disables the engine so you cannot drive it and damage it. It must go to the shop. This sometimes happens after an aftermarket exhaust system is installed and it was not done properly or if engine modifications were done improperly. This can clog the catalytic converter and cause higher back pressure.

Posted on Jul 15, 2009

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Dec 10, 2012 - Tech Tip: Reduced Engine Power Message Displayed on GM Vehicles ... Model year 2008-'10 vehicles must have the engine control module (ECM) reprogrammed ... Do not drop the electronic throttle control components.

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Engine power reduced displayed


sounds like the camshaft sensor or the crankshaft sensor, either way I think your car is being recalled for a faulty ignition switch which could turn off by itself.

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Can you bypass the engine power reduced on a 2007 chevy cobalt


You need a knowledgeable technician and the proper
use of enhanced trouble codes & reference material
for your vehicle

Question?

Where the parts replaced actually tested & how?
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My engine coolant temperature warning light came on, it started losing power and shut down. Now it won't start now. What is wrong with it?


if you dove it for a while wen the light came on you may have lost some engine coolant and now the engine may of over heated and sized up and now it wont work

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2 Answers

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Your ECM, or on board computer, will reduce engine power when it detects a problem that is potentially harmful to the engine. The only way to determine what caused the reduced power is to have the computer scanned for codes.Once you have the codes, we can diagnose the problem.You can have the engine scanned for free at just about any major auto parts store.

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Hi, this happens when the computer is not receiving data from the sensors that is critical to proper operation of the engine. Get an OBD2 scan at your local parts store and write down the trouble code. Then send the code to us for repair advice.

Please see my tip at http://www.fixya.com/cars/r5932051-check_engine_light_check. These are generic instructions. If you get stuck or need specific instructions for your car, please get back to me with model, year and engine info.

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Ususally the thermostat opens at 195 to 200 degrees. Coolant and pressure allow normal temps to go to 230 to 240, and much higher under heat soak condition (unit turned off). Fans kick in near that temp. So, the engine needs to be that hot to be efficient and to have emission controls shift to normal... Also the high temprature prolongs engine life by forcing moisture from the oil.

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Check the drive belt,and the alternator,most likely if the belt is still on,and it is running on the pulleys ok,then the alternator maybe out,have it checked,with out the alternator working the engine will not perform.

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disconecting the battery should reset the pcm. but you will need to find out what caused the problems.

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at first blush i would say alternator... have it tested.

Robert

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