04SlvrJetta
Veteran Member
I hope I'm in the right spot for this question. My wife's car is a 98 Jimmy (big mistake) with about 105k miles. Anyway, it has started this hesitation and rough idle. It is an intermittent problem..sometimes there and sometimes non-existent. Engine speed or temp don't seem to matter. This problem comes and goes cold or hot, idle or driving, city or highway, 20 or 80 mph. Yes 80, but my Jetta TDI feels better at 115 than this vehicle feels at 70! When the problem doesn't show it's ugly head, the vehicle runs fantastic. This is probably due to the rebuild at 89k! It has thrown a misfire code in the past, but I have since checked several times and get no codes with my scanner. I suspected a vacuum leak, but can not find one and ruled it out since it is not there all the time. I also have rapped on the ECM (Haynes recommendation) to try to determine if there may be an electrical short/long. One day I was looking/listening for loose hoses, etc and heard a snapping noise. I was certain that I had a bad plug wire since the hesitation seemed to match up with this snapping noise. Well, I changed the wires and the problem disappeared for a couple of days and came right back. Can anyone give me some advice? I suspect it is fuel or ignition related. The rotor and cap are good. I have replaced the air filter, cleaned the MAF sensor, run a few cans of injector cleaner and replaced the pcv valve. Timing is not adjustable. The (in-tank) fuel pump/sending unit was replaced a little over a year ago. I have a Haynes book, but it doesn't offer up much. I have thought about the fuel cap and ign coil. They're cheap and replacing would rule them out. Any suggestions are appreciated!