Sluggish [Archive] - Forum


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03-01-2008, 11:34 PM
I have had my 04 Gran-Am to the shop 2 times and its still not fixed.

At 30-70mph the power is low,when climbing hills it continues to loose speed until i really smash the gas.
This started all last fall when the weather was still above 50 degrees, when the weather got colder (below 40) it runs pretty good, but on a day over 50 its back to the same problem.
This car has 130k and no mods and no problems until now.
It is not throwing any codes.

I have had the following done but the problem still exist,,any help

new cat.
new computer.
new fuel filter
new o2 sensor
new plugs and cleaned injectors
fuel pressure is right with specs from factory.

Thanks in advance.

03-01-2008, 11:39 PM
IAT sensor?

03-01-2008, 11:44 PM
hows your fuel mileage?

03-02-2008, 12:55 PM
sorry,,what is a IAT sensor???

I drive this car approx 600-700 miles per week and when it was running good it was approx 27-30mpg on the V-6.
When its warm and loosing its power its approx 22-24 mpg.


03-02-2008, 01:03 PM
Compression or rings?? IDK.