Mechanics

TROUBLE CODES: P0640, P0650, P0670

1995 Buick Lesabre • 85,000 miles

I'm getting all 3 of these codes and not sure what to do.

I had been getting a P0171 code and I cleaned the mass air flow sensor.

This seemed to solve the P0171 problem and it also stopped the valves from pinging.

Car ran great for two days and still seems to be running fine but the check engine light is coming back on now and my scan tool is giving me these 3 codes: P640-QDM 1 FAULT, P650-QDM 2 FAULT, and P670-QDM 4 FAULT.

Can you please help me with this?
Avatar
95buick95
April 25, 2012.




You need to check the injector readings. Do an ohm check on them to make sure they are ok. You may also have a bad pcm but you need to have it verified by a shop before spending any money.

Roy

ASEMaster6371
Apr 25, 2012.
Thanks for the response ASEMaster. Could you please give me the specifics on testing the injectors? Also, if the injectors turn out to be ok, would you lean toward the computer being bad?

Tiny
95buick95
Apr 25, 2012.
The ohms should be about 7-9 ohms. If any or if all are the same, then all is good on them. If they are varying more than 2 or 3 ohms, it may be time for new injectors.

Roy
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ASEMaster6371
Apr 25, 2012.

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