![]() Basically you have your extruded oval shape that is ‘capped’ on either end where the exhaust pipe goes through. Unfortunately for me, instead of a hole it actually caused the muffler to separate from the ‘end cap’ as I’ll call it. She did seem to backfire more often during these episodes and I did end up blowing a ‘hole’ in my muffler. I also became more ‘prepared’ for lack of a better term and if I felt her start to give me trouble, I would let off the gas and just coast for a minute and she’d be fine. Still not perfect, but no more breakdowns on the side of the road. Hi all! An update and some questions are below.Īfter ‘resetting’ the PCM by unplugging the negative battery cable over night, my Jeep ran like a dream compared to what it had been. Any idea what it could be? Is it a throttle position sensor? Air idle control valve? I’m at a loss…. Sorry for the essay I just wanted to give a lot of detail. Rinse adn repeat a few times and I finally get home. Start merging onto highway and she starts bucking/misfiring so I have to pull over, this time the neutral trick does not work and she dies. No bucking/problems just a silent death like I turned off key. Pull up to first stoplight and as I brake, I feel her cut out. Get going on city roads on way to highway. Rest of drive goes OK.Īfternoon commute: Start up in parking lot and she is misfiring like crazy…try giving gas but it’s like she’s not getting it and just keeps sputtering. She starts bucking/misfiring as I’m sitting at a stop on side of road so I throw it in neutral and she immediately recovers. Get out on highway and she loses throttle control and so I start pulling over (pumping gas is not doing anything). Reverse back over bumps no issue, go through speedbumps in neighborhood no issue. Starts right up, pull forward into driveway and pop hood – shake some wires, check battery connection …nothing loose. Starts right up, back up into street (another bump) and she cuts out again!). Backing out of my driveway, hit a bump as the garage is uneven with driveway and front tires impact driveway. Rest of drive was uneventful.ĥ/21/13 – Morning commute. Push pedal to the floor and she almost instantly starts accelerating. Start putting on blinkers/looking to get over and I hear/feel the car downshift (this is a new experience when this happens)…almost as if I had manually downshifted to brake the car. Constant acceleration to maintain speed, feel that no longer have throttle control. Pump one more time and she accelerates like normal and is fine.ĥ/26/13 – Driving on highway (~70mph). Pump gas pedal about halfway through range, car backfires. Thought I had bad fuel pump / clogged filter (in this jeep it’s all 1 unit and had to drop the tank so my time was already invested – easier just to replace) – did not test fuel pressure (I know I should have or I’m just throwing money at it)ĥ/11/13 – Replaced wires (noticed one was touching engine block and had some melting on casing)ĥ/14/13 – Driving on highway (~70mph). Took it to Firestone for misfiring symptomsģ/06/13 – Replaced fuel pump myself because jeep was still misbehaving. – Replaced ignition coil because it had thrown a code that called it out (only 1 coil onġ1/09/12 – Replaced crankshaft position sensor (Firestone read a code Autozone could not (so they say) and it called out CPS). Regular oil changes every 3k miles (just to state the obvious)ħ/02/11 – Replaced ECU(jeep was cutting off on its own – dealer verified this was problem)ħ/02/11 – In process of debugging, shop replaced distributor, ignition coil, cap, and rotor buttonĤ/27/12 – Water pump replaced (garage was flooded with coolant every day…)Ħ/15/12 – Used Marvel Mystery Oil because a friend suggested it’d be a good way to clean out my engine…problem ensued (could be coincidence)ġ0/20/12 – Replaced rotor button, cap, spark plugs, ignition coil, and air filter Loss of throttle control (stepping on peddle doesn’t do anything)ġ997 Jeep Grand Cherokee 2WD 4.0 L 6 Cylinder Automatic Intermittent episodes to just shut down completely (sometimes voilent, sometimes like I turned off key) Misfiring / bucking throughout driving range (city & highway speeds) I’m pretty handy…just need your help on what to do! I’m no mechanic, but I’d like to be more educated. This past week it has been misbehaving a lot so I’ll focus on that. It’s been intermittent (over almost a year period) and usually I’ve been able to get by with just pulling over and restarting. I’ve been struggling to find a gremlin hiding in my 97 Jeep Grand Cherokee for a while now but still no joy.
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