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Old 03-16-2003, 05:41 PM   #1
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Default 1990 Bonneville

I have a 1990 Boneville with 216,000 miles on it. My service engine soon light came on and don't understand the code it gave me.

The car idles really rough, and sounds like it wants to stall out. I pulled a 65 code off the computer but don't understand what it means. EGR flow check. Does anybody know if the rough idle and this EGR flow check have a connection?

What would be the steps in fixing this rough idle/EGR flow check problem and how do I get the SES light off? Disconnect the battery??

Thanks for your time.
Jason K Knier
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Old 03-16-2003, 07:47 PM   #2
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I think I remember several people having a problem with the EGR valve sticking and that causing a rough idle. Search around the forum for EGR valve stick or something similar. Depending on what the damage is the valve may just need to be lubricated and not replaced.
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Old 03-16-2003, 10:52 PM   #3
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I think code 65 means...

"Cruise Servo Position Sensor Circuit (open/grounded)"

Can you double-check the code number?
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Old 03-17-2003, 01:24 PM   #4
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Yeah it is code 65, and then the chart I have said that code 65 is the same as code 63. And code 63 is saying the EGR flow check.

It runs fine at higher RPM'*, but when it is at a stop sign, it idles rough occasionally. I know that the MPG is not going to be as good and am afraid of breaking more things.

Thanks for the replies and checking daily
Jason K Knier
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Old 03-17-2003, 11:00 PM   #5
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I just had this problem with my 88 LeSabre. I ran a half tank full of "sea foam" and cleaned the intake using carb cleaner and it quickly went away just a few miles after doing that. It had been on for 3 or 4 doors straight before I did that. I don't know if it was a coincidence or not..
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Old 03-17-2003, 11:57 PM   #6
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Everyone is probably gona laugh at me, but I'm 17, what is an EGR Valve? Stupid question right?
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Old 03-18-2003, 12:02 AM   #7
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Old 03-18-2003, 12:04 AM   #8
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HAHAHA!

We were posting at the same time, and I beat you AGAIN! SLOWPOKE!
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Old 03-18-2003, 12:10 AM   #9
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The EGR valve lowers the combustion temperature of the engine by feeding small amounts of exhaust back into the engine.

By lowering the combustion temperature, the NOx emission levels are lowered.

NOx is bad for the environment because it combines with VOCs in the atmosphere in complicated reactions during hot sunlit conditions to form ground-level ozone, which is bad for human and animal health.
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