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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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2006 Chevy Colorado, rpms are jumping up and down between

Customer Question

2006 Chevy Colorado, rpms are jumping up and down between 500 and about 1200, mainly when coasting and even more when i brake at highway speeds, and once in a blue moon the truck will not start i believe it is getting fuel, ill sit 5-10 mins and try again and it will start right up, what could cause this?
Submitted: 1 year ago.
Category: Chevy
Expert:  Dan replied 1 year ago.

Hello, my name is***** the check engine light on? Does pressing down on gas pedal help it start? Thanks.

Customer: replied 1 year ago.
Check engine light is on, and sometimes it does help to push gas and sometimes it doesn't
Customer: replied 1 year ago.
There is also a strange whine when i accelerate coming from engine compartment but i dont know if its related
Customer: replied 1 year ago.
I havent pin pointed that yet i just noiced it
Expert:  Dan replied 1 year ago.

Sorry about delay, do you know what diagnostic codes you're getting? Thanks.

Customer: replied 1 year ago.
There were a lot some i believe were o2 sensor, M.A.P, wheel speed sensor, thermostat sensor (the name has slipped my mind
Customer: replied 1 year ago.
I can get the whole list in a couple of hours
Expert:  Dan replied 1 year ago.

Ok, let me know. Also try to reset codes and let me know which one comes back first if posible. Thanks.

Customer: replied 1 year ago.
Does the code reader show the codes in the order they are thrown
Expert:  Dan replied 1 year ago.

I'm not sure, I don't think so. Having the codes in general should give me some direction though.