Newton Posted October 2, 2016 Share Posted October 2, 2016 jeep has very hard start sometimes doesnt start at all white smoke from muffler and if it does start it begins with a serious miss like its running on 2 pistons then picks up idle after a few seconds if i press the throttle i hear like a small backfire in the throttle-body and it hesitates when u press the throttle also and then after a few seconds it stalls .. i have on a new tps new iac cleaned throttle body only thing i havent changed is map sensor do you think that might be what it is? Link to comment Share on other sites More sharing options...
omega_rugal Posted October 2, 2016 Share Posted October 2, 2016 white smoke? isn`t water being pulled inosde the cylinders? Link to comment Share on other sites More sharing options...
schardein Posted October 3, 2016 Share Posted October 3, 2016 A little white smoke can be normal, H2O is a normal by-product of combustion. More than a little indicates water in the cylinders (leaking/blown head gasket, cracked head). This will definitely make it run rough. And if it is a bad head gasket or cracked head and a cylinder gets more than a little water in it, you can have a broken piston or bent rod from hydro-lock the next time you try to start it. Link to comment Share on other sites More sharing options...
Newton Posted October 3, 2016 Author Share Posted October 3, 2016 white smoke? isn`t water being pulled inosde the cylinders? A little white smoke can be normal, H2O is a normal by-product of combustion. More than a little indicates water in the cylinders (leaking/blown head gasket, cracked head). This will definitely make it run rough. And if it is a bad head gasket or cracked head and a cylinder gets more than a little water in it, you can have a broken piston or bent rod from hydro-lock the next time you try to start it. The smoke isn't bad just when I crank it but after that when it starts it goes away Link to comment Share on other sites More sharing options...
88whitemanche Posted October 3, 2016 Share Posted October 3, 2016 Double check your vacuum hose at the map sensor Link to comment Share on other sites More sharing options...
Newton Posted October 3, 2016 Author Share Posted October 3, 2016 Double check your vacuum hose at the map sensor I already checked seems to be fine do you think starving from gas could be the problem too? Put in a new filter 2 days ago but i think my tank may need cleaning Link to comment Share on other sites More sharing options...
cruiser54 Posted October 3, 2016 Share Posted October 3, 2016 Could be low fuel pressure..... Link to comment Share on other sites More sharing options...
Newton Posted October 3, 2016 Author Share Posted October 3, 2016 Could be low fuel pressure..... Will check pressure and report back Link to comment Share on other sites More sharing options...
Newton Posted October 3, 2016 Author Share Posted October 3, 2016 the fuel pressure in the rail was about 15 psi although the gauge i was using had a small leak i'm guessing thats not good...bad pump? Link to comment Share on other sites More sharing options...
cruiser54 Posted October 3, 2016 Share Posted October 3, 2016 the fuel pressure in the rail was about 15 psi although the gauge i was using had a small leak i'm guessing thats not good...bad pump? Most likely. Link to comment Share on other sites More sharing options...
Newton Posted October 4, 2016 Author Share Posted October 4, 2016 the fuel pressure in the rail was about 15 psi although the gauge i was using had a small leak i'm guessing thats not good...bad pump? Most likely. I recently put in a new pump about 2 or 3 weeks ago and also changed the fuel filter a few days ago i know inside my fuel tank might be dirty do you think also a clogged fuel filter could also be a possibility even though it was just changed a few days ago? Link to comment Share on other sites More sharing options...
Marine1Texas Posted October 5, 2016 Share Posted October 5, 2016 Could have a clog! Did you replace the rubber lines that were in the tank connected to the fuel pump? My pumps never go bad, just ever 8 or 9 years a small pin hole gets in the hose at the top and starts spilling gas back in to the tank . Link to comment Share on other sites More sharing options...
Newton Posted October 5, 2016 Author Share Posted October 5, 2016 Could have a clog! Did you replace the rubber lines that were in the tank connected to the fuel pump? My pumps never go bad, just ever 8 or 9 years a small pin hole gets in the hose at the top and starts spilling gas back in to the tank . I'm going to check it out when I drop the tank..thanks Link to comment Share on other sites More sharing options...
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