1996 GMC Savana Van Owner's Manual - Page 109

If the LightIs Flashing The following may prevent more serious damage to your vehicle: Reduce vehicle speed. Avoid hard accelerations. 0 Avoid steep uphill grades. If towing a trailer, reduce the amount of cargo being hauled as soon as it is possible. Are you low on fuel'? As your engine starts to run out of fuel, your engine may amounts of not run as efficiently as designed since s~nall air are sucked into the fuel line causing a misfire. The system can detect this. Adding fuel should correct this condition. Make sure to install the fuel cap properly. It will take a few driving trips to turn the light off. Have you recently changed brands of fuel'? If so, be sure to fuel your vehicle with quality fuel (see in "FLE~" the Index). Poor fuel quality will cause your engine not to run a s efficiently as designed. You may notice this as stalling after start-up, stalling when you put the vehicle into gear, misfiring, hesitation on acceleration or stumbling on acceleration. (These conditions may go away once the engine is warmed up.) This will be detected by the system and cause the light to turn on. If you experience this condition, change the fuel brand you use. It will require at least one full tank of the proper fuel to turn the light off. If none of the above steps have made the light turn off, have your dealer orqualified service center check the vehicle. Your dealer has the proper test equipment and diagnostic tools to fix any mechanical or electrical problems that may have developed. If the light stops flashingand remains on steady, see "If the Light Is On Steady" following. If the light continues to flash, when it is safe to do so. stop the vehicle. Put your vehicle in PARK (P). Turn the key off, wait at least 10 seconds and restart the engine. If the light remains on steady, see "If the Light Is On Steady" following. If the light is still flashing follow the previous steps, and drive the vehicle to your dealer or qualified servicecenter for service. If' the LightIs On Steady You may be able to correct the emission system malfunction by considering the following: Did you just drive through a deep puddle of water? If so, your electrical system may be wet. The condition will usually be c0rrecte.d when the electrical system dries out. A few driving trips should turn the light off. 2-51