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GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 15201
Experience:  GM Grand Master Technician 2007. 14 years experience.
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I have a 2005 chevy cavalier. i got a check engine light

Customer Question

Hello i have a 2005 chevy cavalier. i got a check engine light driving down the road. So when i got home i pulled the code po172 which said running rich in bank 1. so i cleared it drove to work and noticed i had loss of power 65mph up hills on interstate. So i got to town i put injecter cleaner it. it still had loss of power. So i got to work shut it off. next morning after work went out to start to go home and would not start at all. I tried starting no luck it didnt even try to start. So that nite i loaded it on trailer. There were no codes. I un hooked battery. Thats all of what went on.
Submitted: 1 year ago.
Category: Chevy
Expert:  Gary replied 1 year ago.

Hello there,

I would be pulling the spark plugs out to see if one injector has flooded the engine to a hydraulic condition.

I have seen many cars with injectors that stick open.

The next start up is generally no crank condition.

Are you able to do this or have it done for you?


Customer: replied 1 year ago.
Yea . why dont i have a spark?
Expert:  Gary replied 1 year ago.

Do you mean it cranks no fire, crank crank crank?

Or no crank at all?

Customer: replied 1 year ago.
crank no fire
Customer: replied 1 year ago.
cranks no fire
Expert:  Gary replied 1 year ago.


It could be one of many things wrong here.

The first thing for you to do here is to have the vehicle scanned for codes.

Crank no fire would be unlikely more than one coil.

It could be a crank sensor that was starting to, then has ultimately failed.

An engine dtc will be set if this is the case.

I would be checking the valve timing also if necessary.


Customer: replied 1 year ago.
Yea it has been scanned for codes and there is none on there.
Expert:  Gary replied 1 year ago.

Well now it gets difficult.

One of the three things we need it missing.

We need to check for spark, fuel pressure and injector pulse, and correct valve timing/compression.

Are you capable of doing all of this?

I am not with you so if you can get a friend to help you, we'll see how we go.


Customer: replied 1 year ago.
yea i will do it when i get off work. And get back to you.
Customer: replied 1 year ago.
there is no spark i have checked that all ready.
Expert:  Gary replied 1 year ago.

There is a special procedure to check for spark.

Your engine has an ignition coil housing with an ignition control module mounted on top of it.

I don't want to say replace this, replace this etc.

An ignition coil failure on one or more cylinders would make the car run rough AND store misfire codes.

Yours only stores rich code of P0172.

Sounds more like a jammed fuel pressure regulator.

I would recommend you take the car to Chevrolet for further diagnosis.

The main thing is the engine is a timing chain engine, so if the was a problem there, it would have been noisy.

I hope this is of some help.