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Ask GM Tech (Cam) Your Own Question
GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 15181
Experience:  GM Grand Master Technician 2007. 14 years experience.
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I have an 07 cobalt. the timing went on the car and i

Customer Question

i have an 07 cobalt. the timing went on the car and i replaced the engine with a correct style engine. with everything plugged where it should be, the car barely starts and when i does it runs like crap and gives me power reduced message. a cel came on for crank position sensor. i noticed the connector was broken. so i replaced the connector and sensor with acdelco products. the fist time i tried to start it it ran great for about two minutes. started to burn rich. i turned the car off, went to restart it. no start. right now i am at a lose
Submitted: 3 months ago.
Category: Chevy
Expert:  AMEDEE replied 3 months ago.

Hello and welcome!

My name is ***** ***** I can assist you with your question.

Expert:  AMEDEE replied 3 months ago.

Would you like the diagram of the timing marks on this engine?

Customer: replied 3 months ago.
no i replaced the engine.
Customer: replied 3 months ago.
i cant figure out why the engine runs rough or wont start
Customer: replied 3 months ago.
hello?
Expert:  AMEDEE replied 3 months ago.

YES, I am here

Expert:  AMEDEE replied 3 months ago.

Are there any codes in the computer?

What is the engine vacuum at when the engine is running?

If it does not start, have you checked for spark?

Does the engine run on starting fluid?

Customer: replied 3 months ago.
i have codes for mass air flow, camshaft sensor, map sensor, throttle position sensor
i have no way of checking the vacuum.
something else i should state is no rpms show on the gauge
Expert:  AMEDEE replied 3 months ago.

Thank you for that information

No RPMS on what gauge? The tach?

Customer: replied 3 months ago.
correct. also on the scanner
Expert:  AMEDEE replied 3 months ago.

Ok, does the engine have spark when cranking?

Have you checked the crank sensor signal and ignition system?

Customer: replied 3 months ago.
i can get the engine to start but it barely runs. it sputters and misses. and burns rich. the crank sensor and connector was just changed with acdelco parts. no change
Expert:  AMEDEE replied 3 months ago.

Have you checked engine compression?

Have you checked for plugged exhaust?

Customer: replied 3 months ago.
exhaust is not plugged. random cel keep coming on.
Expert:  AMEDEE replied 3 months ago.

Ok, so why cant you check engine vacuum?

Customer: replied 3 months ago.
i dont know how. nor do i have a gauge to check vacuum
Expert:  AMEDEE replied 3 months ago.

Ok, sir, I dont think I can help you.

I will leave this open for other experts.

Good luck.

Expert:  Jared D replied 3 months ago.

Hi,

New expert here. Do you still need help with this?

At this point will the engine at least sort of idle?