1997 Plymouth Grand Voyager Logo
Posted on Feb 13, 2011
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Had replaced spark plugs, spark plug wires, cap and rotor, MAP sensor, ignition coil, fuel filter, fuel pump. Engine runs smooth but the "service engine soon" light would not go away. The code always indicates "multiple misfire." It might give me headaches soon. Please help! Manny

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john milligan

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  • Posted on Feb 13, 2011
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Try turning the key on and off without starting the engine about 15-20 times to clear the codes.

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Very often (and I am sorry to point out something so obvious after you did all that work) it is caused by using a gas grade other than what the manual calls for....

Most commonly, it is caused by using regular gas in an engine that calls for premium. High compression engines demand premium fuel and the antiknock sensors are very sensitive (they use quartz crystals that can detect the smallest change that you and I could never sense in a running engine) and I have seen this problem many times.... in my own car, my Daughters, and countless friends.... where the grade of gas made the difference even though everything seemed OK.

Your Grand Voyager probably calls for regular - same as my Wife's 1995. If you are using mid-grade or premium, you are wasting money for starters. Her Grand Voyager and my 2001 Jeep both call for regular gas and they DO NOT LIKE higher grade gas... the SES light will come on in about 20 miles on a tank of "good stuff"!

Once you get a full tank of the right grade gas (you may have to run it down a bit so you don't dilute it too much), reset the codes again and you will probably find that they do not come back!

Also- in the winter especially, the gas formulation is messed with to meet federal clean air laws. This varies allot from one brand to another so even if you are using the right grade gas, try a different brand.

Personally, I have a 2001 Jeep Cherokee and in the winter if I use Hess gas my SES light will come on within 20 miles of driving! The "no-name" gas I get at a local Quick Check puts the light back out after about 10 starts.

Finally, if it is not related to the brand or grade of gas..... make sure your fuel filler cap is tight. I know it sounds silly, but a loose cap WILL cause your SES light to come on! Something about back pressure on the return line...

Good luck! Please let me know if my advice didn't help and any other observations you find on your Voyager.

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