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ndgo88
New User
| Posts: 1
| Joined: 11/05
Posted: 11/13/05
11:42 AM
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1997 Buick Lesabre Custom
3.8 litre V-6
180,000 miles
I have a two - fold problem
Problem #1
When I start the car in the morning the car idles extremely fast up to 3500 rpms
After running for a couple of minutes I turn off the ignition and restart and the car then idles
@ approximately 700 rpms. While driving under normal conditions the car will idle up to 1500 rpms and return to normal.
Problem #2
In overdrive gear car will buck when going up hills. Starting off and up through third gear is fine.
I have replaced egr, tps. I did however recently replace spark plugs and car ran fine for a few days and returned to the above listed issues.
Has anyone else had this problem and if so any suggestions? Any help or suggestions would be greatly appreciated.
ndgo88
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bigcman
New User
| Posts: 11
| Joined: 11/05
Posted: 11/18/05
08:00 PM
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Did you change the plug wires? Many times a bad spark plug can ruin the wires. It's harder for a messed up plug to fire, and it will get the plug wires too hot and ruin them.
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melsa1
New User
| Posts: 10
| Joined: 11/05
Posted: 11/22/05
07:52 PM
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This sounds to me like an idle air control valve problem.
The ideal way to do an accurate diagnostics is to first hook up a scan tool and see what your coolant temp, Intake air temp sensor, Throttle Position Sensor, MAP or Bp sensor signal read.
Any one of the above sensors can give problems.
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