What would cause a jeep to shake and backfire when you start the jeep?
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Last edited by terenkleon; Aug 29, 2013 at 06:26 AM.
As already stated it does sound very much like a misfire which alot of times is due to the spark plugs.
Another thing,does it do it after being restarted after a short period of sitting particularly on a warm day? That's a common problem with those year XJs, My 2000 Cherokee did that a few times. Something with heat being trapped around the number 4 or 3 injector and the fuel vaporizing, causing it to misfire if it was started up before the heat dissipated. Does your parents Jeep throw a Check Engine Light? Mine would, would show that it had a random misfire code.
Another thing,does it do it after being restarted after a short period of sitting particularly on a warm day? That's a common problem with those year XJs, My 2000 Cherokee did that a few times. Something with heat being trapped around the number 4 or 3 injector and the fuel vaporizing, causing it to misfire if it was started up before the heat dissipated. Does your parents Jeep throw a Check Engine Light? Mine would, would show that it had a random misfire code.
Last edited by Countryboy_4_life; Aug 30, 2012 at 04:48 PM.
i have found on chrysler engines with a distributor gets moisture in the cap. .distributor moisture fix. Some chrysler distributor cap that has an air vent, needs to have the vent plugged. Best to use JB-weld. But there might be some brands that run air through as part of the system, dont seal them



