Question about 1999 Buick Park Avenue

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Hi-Speed Miss under load on Park Avenues - Both Ultra and Non-supercharged

Both cars have under 40K miles - 'just changed the fuel, air and oil filters on the non-supercharged car as a precaution. Both have exactly the same issue. At normal temperature, either pulling even a slight hill or with light to moderate accelaration on level ground, they miss badly. Power drops off instantly and miss continues until RPM picks up to 2000+, but pulling power is still abnormally low. I got an engine warning light one time (code was miss on #2 cyl) for the Ultra, but the light extinguished on its own.

I also had a 1998 Ultra with 160K miles that did essentially the same thing. Can you point me to the probable issue or help me with troubleshooting? It only happens while moving under load - most often with engine RPM at 1500 or below. I cannot duplicate when I'm under the hood. Thanks

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Dear sir/madam,

I think he crank sensor is defective, or installed wrong. The cam sensor controls fuel injector timing and can cause sputtering and hesitation. The timing must be correct for the injector to fire when the intake valve is opening. Check for any scratch marks on the cam sensor. In addition, check the cam interrupter magnet and be sure it in place and not damaged.

The ECM sends a 5-volt reference signal to the CTS sensor. As temperature changes in the coolant, the electrical resistance of the CTS sensor also changes. The best way to test this sensor is with a scanner. When the engine is cold, engine coolant temperature should measure near the same as the ambient temp. Another way to test the CTS sensor is to measure voltage from the time the engine is started, until it warms up. Record the voltage changes as the engine warms up to operating temp. i.e. 120, 140, 160 & 180. You should see close to the full range of voltage (5.0-1.0V) during this test. If it does not change from what you first measured cold, replace the sensor!


thanks
good luck


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Posted on Jul 27, 2008

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