Mechanics

MISFIRING AT SLOWED SPEED OR STOP

1993 Buick Century

Engine Performance problem
1993 Buick Century 6 cyl Two Wheel Drive Automatic 166000 miles

I have a 1993 Buick Century that runs good, doesn't smoke, leak fluid, etc. However, when taking off from a stop, it will hesitate somewhat. It will also misfire at high speeds when you hit the gas hard. Please advise. Other than that, it keeps on going and never completely dies.
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Awrbulldog
June 12, 2009.




First, if the service engine light is on or flashing, get back to me and I will walk you through reading the codes if you need that help, these are all the possiblities or hesitation: HESITATION, SAG OR STUMBLE Symptom Definition Momentary lack of response when accelerator is pushed down. Condition occurs at all vehicle speeds or usually occurs when taking off from a stop. Possible Cause & Correction Check the following items:  Visually check vacuum hoses for splits, kinks and proper connections as shown on Vehicle Emission Control Information label. Check ignition wires for cracking, hardness and proper connections at both distributor cap and spark plugs.  Check wires for pinches, cuts and proper connections.  Ensure fuel pressure is correct at all speeds. Also, check for poor quality or water contaminated fuel.  Check for fouled spark plugs.  Ensure installed PROM/MEM-CAL is correct for that particular vehicle. Check with dealer for latest application information.  Check for a binding or sticking TP sensor.  Ensure initial ignition timing is properly set.  Ensure ECM-controlled idle speed is correct.  Check EGR system for proper operation.  Disconnect fuel injector electrical connectors. Crank engine and check for injector leaks.  Check engine cooling system thermostat for proper operation and application.  Check for an open in HEI ground circuit.  Check canister purge system for proper operation.  Check charging system output. Repair charging system if voltage is less than 9 or more than 17 volts.  On PFI vehicles, perform INJECTOR BALANCE TEST in I - SYS/COMP TESTS article in this section.  Check MAP or MAF sensor output. Page 1 of 1 6/12/2009

Merlin2021
Jun 12, 2009.


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