86jeep Posted December 2, 2011 Share Posted December 2, 2011 when i bought this mj 86 2.5 auto 2wd it would bog down bad at 70 and drink gas bad i replace the fuel filter. gas mileage got 85 % better. I notice today it still loosing fuel or fire one going down the rd at 70 mph but it only does it for just a few 3-5 seconds at a time then it picks back up every time what do ya think it is i have put on new plugs, cap, wires, rotor button, coil thanks Link to comment Share on other sites More sharing options...
MJCARENA Posted December 3, 2011 Share Posted December 3, 2011 never mind. Link to comment Share on other sites More sharing options...
86jeep Posted December 3, 2011 Author Share Posted December 3, 2011 never mind. wth11111111 Link to comment Share on other sites More sharing options...
carnuck Posted December 8, 2011 Share Posted December 8, 2011 Could be ignition switch going bad Link to comment Share on other sites More sharing options...
skidoo_j Posted January 23, 2012 Share Posted January 23, 2012 What RPM are you running at? How does it run at lower speeds in same rpm range? Cruising or accelerating? Does it only happen at 70 or is it 70+ ? Does the gauge drop when this happens and that's why you think your loosing gas? You've check fuel lines all way back to tank for cracks? Maybe your fuel pump wiring is shorting out or rubbing at a certain vibration. Link to comment Share on other sites More sharing options...
86jeep Posted January 23, 2012 Author Share Posted January 23, 2012 at low speeds it don't do it only when u going over 40 Link to comment Share on other sites More sharing options...
skidoo_j Posted January 23, 2012 Share Posted January 23, 2012 What happens causing you to think you're loosing gas and not just burning it? I'm not a 2.5 guy but on my 4.0 I had a hesitation and ran injector cleaner and cleaned tb. it resolved it.. But i did check to make sure my fuel pressure was accurate. Could also be an O2 sensor if your truck transitions into cruise or closed fuel mapping. Link to comment Share on other sites More sharing options...
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