I have a 2001 GMC savana van and it's running a little sluggish. Check engine light is on, thought it was bad injectors so cleaned them. ran a little better but still hesitates. went to local auto store yesterday and they hooked up to computer error code states misfire on # 8. suggested i change plugs and wires but can not even see wires / plugs from under hood. any suggestions
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the ac compressor is controlled by the thermostat connected to the evaporator under the dash When the cab air temperature reaches the set temperature the ac compressor switches off . IT is called cycling. If it causing a problem with the engine rpms then there is a sensor problem not an ac problem so run the fault codes to determine where it is . ECM's are programmed to maintain constant rpm regardless of the load placed on the engine at idle.
Check your battery connection's, if when it clicks one time do the lights go off?Then more then likely bad battery connection.With light switch on move battery connection if lights come on you found your problem.
could be a bad fuel pump, or fuel pump relay. they are having problems(a lot) with the ethanol in the gas on GM products.Fuel pumps sales are through the roof at parts house on GM's. Have a pressure check on your fuel system. That is probably it. Add a can of Seafoam to your fuel every 3000 miles to alleviate this problem.