Question about 1993 Jeep Grand Cherokee

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I WAS DRIVING MY JEEP AND IT JUST SHUT OFF AFTER CHECKING THE FIRE THERE WAS NO FIRE.I GROUND THE SPARK PLUG WIRE FROM THE DISTRUBITURE TO A BOLT WITH A SCREW DRIVER AND THE VEHICLE START TO FIRING THIS IS THE SECOUND TIME THIS HAPPEN.I GOT A CODE 34 WHICH SAYS IDLE RELAY WHERE DO I FIND THE IDLE RELAY.

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  • lawjonwil Oct 11, 2010

    WHERE IS THE HT COIL LOCATED? JUST FYI I HAD THE MUFFLER CHANGED OUT AND THE CAYTLE CONVERT THE VEHICLE SHIFTING BETTER.I WAS DRIVING THE JEEP IT CUT OFF AND WHILE I WAS DRIVING TWICE WITHIN 15 MINUTES.THE JEEP WOULD START RIGHT BACK UP.I SMELLED EXCESSIVE GAS.I HAVE DROVE IT FOR 120 MILES AND IT IS RUNNING FINE RIGHT NOW I DON'T KNOW WHAT GOING ON?DO YOU THINK A STOPPED UP MUFFLER WOULD CAUSE THE COIL TO OVER HEAT BECAUSE IN THE PAST THE JEEP WOULD STOP IT WOULD BACK FIRE AND BUST THE MUFFLER.

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The HT coil, that converts the 12 volt current into 12000-15000 volts, or whatever it has in lieu, is malfunctioning. It gets heated up. And then starts functioning when it cools down. Needs a change.

Posted on Oct 06, 2010

  • Rinoo Kumari Oct 11, 2010

    The HT coil or whatever you have in lieu, is at the other end of the HT wires going from the spark plugs. This carries the HT current.

    It could very well be the clogged up muffler. What happens is that the muffler has the role of evacuating the burnt up gases from the cylinder. If clogged, it stops or nearly stop the flow of the gases and thus impedes the speed and running of the engine. If you want a proof or want to play prank on your friend, just cut a largish potato in to half and block the muffler of your or your friends car. The car will not start at all till this potato is removed.

    The muffler and the HT coil do not have any interaction hence the coil can not get heated up because of malfunctioning muffler.

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